SICK CVS4 OCR Vision Sensor Software Version 1.0 Operating instructions

CVS4

OCR Vision Sensor

Software Version 1.0

OPERATING INSTRUCTIONS

Operating Instruction

CVS4

2 ©SICK AG • 2011-04 • Advanced Industrial Sensors • www.sick.com

Contents

1 Safety ........................................................................... 3

2 Product Specication ................................................. 3

2.1 Function ....................................................................................3

2.2 Special Features .......................................................................3

3 Installation & Quick Start .......................................... 4

3.1 Mounting ................................................................................... 4

3.2 Wiring ........................................................................................ 4

3.3 Basic Setup ............................................................................... 4

4 Keypad and Display ..................................................... 5

4.1 Keypad ......................................................................................5

4.2 Views .........................................................................................5

4.3 Display .......................................................................................6

4.4 Main Menu ................................................................................ 7

4.5 Setting Parameters .................................................................7

5 Set-up and Operation .................................................. 8

5.1 Overview....................................................................................8

5.2 Auto-teach (

AUTO TCH) ...............................................................10

5.3 Semi-auto Teach (

SEMIAUTO) ....................................................12

5.4 Date Teach (

DATE TCH) ..............................................................13

5.5 String Editor (

STRING) ...............................................................14

5.6 Parameters Set by Auto-, Semi- and Date Teach .................14

6 Adjusting Parameters Manually .............................. 15

6.1 Image Capturing .....................................................................15

6.2 Transforming Images .............................................................16

6.3 Recognizing Text .....................................................................17

6.4 Interpreting and Judging Text ................................................18

6.5 Using I/O .................................................................................29

6.6 Other Functions ......................................................................32

6.7 Connect to PC .........................................................................34

7. Maintenance ............................................................ 37

Tables

A, B .................................................................................................19

C .....................................................................................................20

D, E, F.............................................................................................38

G, H ................................................................................................39

I ......................................................................................................40

K, L .................................................................................................41

M ....................................................................................................42

Operating Instruction Chapter 1

CVS4

©SICK AG • 2011-04 • Advanced Industrial Sensors • www.sick.com • 3

1 Safety

b Read this operating instructions before using the device.

b Connection, assembly, and settings must be performed by

competent technicians.

b Protect the device from moisture and dirt during operation.

b This is not a safety component, according to

EU machine guidelines.

b Do not use the device in areas with risk for explosion.

2 Product Specication

The CVS4 is an optical electronic sensor with integrated light, used for

verifying character strings of different formats, such as dates, times

or batch codes.

2.1 Function

The CVS4 learns the character strings to verify by analyzing a captured

image of the object. The character strings can be any of 12 pre-

dened date and time formats or one freely dened text format.

The

CVS4 can automatically detect and learn dates, while some

manual settings must be made for other text formats.

When running, the

CVS4 reads texts on objects and judges them OK

or not

OK according to what is specied as valid strings, or ranges

of dates and times. Valid dates and times are always relative to the

built-in calendar.

2.2 Special Features

b Memory capabilities of 16 teach congurations.

b Simultaneous veries of up to 4 different formats of character

strings on an object.

b Read out recognized characters on serial interface, to be logged in

an Excel le.

b Recognizes 12 predened date and time formats.

b Recognizes arbitrary character strings.

b Batch number checking.

b Up- and download parameter settings to a

PC.

b Set parameters and dene custom characters with a

PC.

b Synchronize the

CVS4 with external trigger and encoder.

Chapter 3 Operating Instruction

CVS4

4 ©SICK AG • 2011-04 • Advanced Industrial Sensors • www.sick.com

3 Installation & Quick Start

3.1 Mounting

b Mount the CVS4 at an angle of -45° – +45° degrees from the object

to avoid disturbing reections from the internal lighting (see

E

).

b The distance between any object and the

CVS4 should be as short

as possible, but within the scanning distance (see

M

“Technical

Data”).

b The longer the distance between the object and

CVS4, the more

ambient light will inuence the sensor. If necessary, use additional

lighting to get rid of ambient light inuence.

b Avoid direct sun light or ambient light on the object.

0°– +45°

-45°– 0°

Object

3.2 Wiring

b Connect the wires according to

B

“Electrical Connections”.

3.3 Basic Setup

For a detailed description of the parameters, see the parameter list

C

in the center of this manual.

b Place an object with the text to verify in front of the mounted

CVS4. If

necessary, press

VIEW until you see the live image on the display.

b Select

SETUP FLOW in the main menu and press SET.

b Select the bank in which to save the text and parameter values by

setting the

BANK parameter.

b If necessary, change the direction that the text should be read by

setting the

ORIENTTN parameter.

b Set the maximum exposure time by setting the

SHTRLIMT parameter.

b Specify the angle from the object at which the

CVS4 is mounted, by

setting the

TRAPEZID parameter (see

E

).

b Specify the order of the year, month and day in dates by setting the

DATEFRMT parameter.

b Teach the text to be recognized by selecting

AUTO TCH and pressing

SET.

The

CVS4 will now automatically make all necessary settings, and if

the text to verify consists of dates the device should be ready for use.

If the

CVS4 did not successfully complete the auto-teach, please refer

to chapter 5 “Set-up and Operation” for more information.

Operating Instruction Chapter 4

CVS4

©SICK AG • 2011-04 • Advanced Industrial Sensors • www.sick.com • 5

4 Keypad and Display

4.1 Keypad

F

1

UP

Scroll up in menu, or

increase parameter

value when editing.

2

DOWN

Scroll down in

menu, or decrease

parameter value

when editing.

3

SET

Show submenu, edit

parameter value,

or save changed

parameter value.

4

TEACH/EXIT

Go up one menu,

cancel editing

parameters (without

saving), or go back

from monitor mode

to normal views.

If pressed > 3

seconds, teach the

text currently in view

using

AUTO TCH.

5

VIEW

Switch what is displayed on the LCD display. (see 4.2

“Views”).

If pressed > 3 seconds, switch to monitor mode, where

you can monitor how the characters are cut out by the

device. Press

TEACH/EXIT to go back to normal view.

4.2 Views

G

Press VIEW to select what is displayed in the image area on the LCD

display:

a

Live image.

b

Thresholded image. Detected characters and other shapes are

displayed in white.

c

Image with the characters cut out. Recognized characters are

enclosed in black rectangles, and the color of the background

depends on the judgement result:

GREEN if the object is accepted,

RED if the object is faulty.

d

Combined view of live image and image with characters cut out.

UP

SET

VIEW

EXIT

DOWN

5

4

1

2

3

Chapter 4 Operating Instruction

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6 ©SICK AG • 2011-04 • Advanced Industrial Sensors • www.sick.com

4.3 Display

H

1

Image area (see 4.2 “Views”)

2

Main menu (see 4.4 “Main Menu”)

3

Monitor mode. Each blue rectangle contains the image of what

the CVS4 considers one character, and that is compared to the

character library.

4

Currently displayed format:

1D First date format 2T Second time format

2D Second date format CH String

1T First time format

Switch between the text formats by pressing

UP/DOWN in monitor

mode.

5

Current bank number.

6

Result of judgement: OK if the object is accepted,

NG if the object is faulty.

7

Judged text. What is shown here depends on which format is

displayed:

a

Date and time (1D, 2D, 1T or 2T):

TOP LEFT Response time (blue).

BOTTOM LEFT Interpreted date or time, or date or time

format if no text is recognized (green).

TOP RIGHT Upper limit for date or time (pink).

BOTTOM RIGHT Lower limit for date or time (blue)

b

Character string (CH):

TOP Number of characters recognized followed

by the text. The color of each characters

indicates how well it corresponds to the

characters in the reference library in the

CVS4.

BOTTOM RIGHT Indicates whether to recognize numbers only,

characters only or both.

8

Horizontal ruler. Each tick mark corresponds to approximately

50 pixels in the image. Use for example when setting character

width.

Operating Instruction Chapter 4

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4.4 Main Menu

A

SETUP FLOW Submenu with parameters and functions used when

teaching the texts to verify.

ADJUSTMENT Submenu with parameters used for adjusting how the

object is judged.

OTHERS Submenu with parameters used for example for setting

up input and output signals.

VIEW NG LOG Shows the images of the last objects where the judge-

ment changed from

OK to not OK (NG). Up to 30 images

can be stored in the log.

CALENDAR Submenu for setting the device’s internal calendar and

clock.

b Select a submenu (for example

OTHERS) by pressing UP or DOWN.

b Show a submenu by pressing

SET. This will show a list of param-

eters and functions.

The colors used in the submenus have different meanings:

YELLOW Parameter value affects all banks.

VIOLET Parameter value only affects the current bank.

ORANGE Function.

BLUE Parameter is locked and cannot be changed.

RED A parameter value displayed in red is currently being

changed.

4.5 Setting Parameters

b Press UP and DOWN to select the parameter in the submenu.

b Press

SET.

– The device displays

EDIT PARAM?

b Press

UP to edit the parameter.

– The parameter value is now displayed in red.

b Change the value by pressing

UP or DOWN.

b Press

SET to save the new value.

– The device displays

WRITE DATA?

b Press UP to save the new value.

– The parameter value is now displayed in yellow or violet again.

By pressing

SET for > 3 seconds, the parameter value is edited or

saved without having to conrm by pressing

UP.

To cancel editing a parameter value and revert to the previously

saved value, press

EXIT.

Chapter 5 Operating Instruction

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8 ©SICK AG • 2011-04 • Advanced Industrial Sensors • www.sick.com

5 Set-up and Operation

5.1 Overview

The CVS4 performs the following steps when verifying the text on an

object:

b Capture an image and adjust it, to get an image of good quality for

character recognition.

b Transform the image – for example rotate or slant it – to be able to

recognize characters in it.

b Recognize the characters in the image, by using a dictionary of

character images and knowledge of the characteristics of the text.

b Interpret the recognized text, and judge whether the text is

OK or not.

Capture

Transform

Recognize Interpret & Judge

Today - 3 days

≤ March 31, 2006

≤ Today + 1 day ?

The text to be veried may consist of up to four different parts, where

each part is either a:

b date

b time

b character string

The

CVS4 can recognize 12 pre-dened formats for dates and times

(such as 4 digit year and English name for month), and one format

for character string. Which text formats to expect on the objects are

set by the parameters

FORMAT 1 – FORMAT 4 (see the parameter list).

Operating Instruction Chapter 5

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©SICK AG • 2011-04 • Advanced Industrial Sensors • www.sick.com • 9

2006-03-31 18:13

2007-MAY

156354A8

Date 1

(

FORMAT 1)

Time 1

(

FORMAT 2)

Date 2

(

FORMAT 3)

String

(

FORMAT 4)

The dates and times are interpreted and compared to the device’s

internal calendar. Accepted dates and times are dened as ranges,

which are relative to the current date or time in the internal calendar.

The accepted character strings are dened when setting up the

device, but can be incremented by using an external signal, useful for

example when verifying batch codes.

The

CVS4 can verify up to four different text formats simultaneously,

but not more than 2 dates, 2 times at the same time. On the

LCD dis-

play, the judged text is shown for one text format at a time – switch

between the formats by pressing

UP and DOWN when in monitor mode

(press

VIEW > 3 seconds).

Currently displayed

format (1D = Date 1)

Upper/Lower limit

for date 1

Date that is read and

judged

A number of parameters in the CVS4 affect how the images are

captured, transformed, recognized and interpreted/judged. These

parameters need to be set before using the device.

All settings related to the texts to be recognized are saved in a

bank. Settings for up to 16 different teach congurations can be

saved, using banks 0-15.

Chapter 5 Operating Instruction

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10 ©SICK AG • 2011-04 • Advanced Industrial Sensors • www.sick.com

The CVS4 is usually set up by going through the following setup ow.

All parameters and functions used in the ow are found in the

SETUP

FLOW

menu. The number of steps required depends on the objects

and environment, but also on the text formats to recognize:

b Set a number of basic parameters.

b Use

AUTO TCH (see chapter 5.2).

– If the text consists of dates and the result is

OK, then the CVS4

should be ready for use.

b Set which text formats to recognize in the text if not dates.

If necessary, adjust how images are captured to improve the image

quality. If the text contains dates or times, you can also make some

adjustments for how to interpret the text.

b Use

SEMIAUTO (see chapter 5.3).

– If the result is

OK, then the CVS4 should be ready for use.

b Adjust character characteristics and/or setting for transformation,

to make the

CVS4 recognize the characters properly.

b Use

DATE TCH (see chapter 5.4).

– If the result is

OK, then the CVS4 should be ready for use.

b Change the string to recognize (see chapter 5.5), or adjust the date

or time ranges.

If you plan to use the inputs and outputs of the

CVS4, you will need to

set up the

CVS4 to use them manually. See chapter 6.5 “Using I/O”.

‘

5.2 Auto-teach (AUTO TCH)

The AUTO TCH function is used for making the CVS4 ready for use by

analyzing an object with the text to recognize.

AUTO TCH can automati-

cally recognize the following date formats:

Example:

b 4-digit year, month and day 2006-03-31

b 4-digit year and month 2006-03

b 2-digit year, month and day 06-03-31

b 4-digit year, day and name of month

in English

2006MAR31

b 4-digit year and name of month in

English

2006MAR

b 2-digit year, day and name of month

in English

06MAR31

b 2-digit year and name of month in

English

06MAR

Note that the order of the year, month and day in the dates are set by

the

DATEFRMT parameter, and that separators are not required.

Operating Instruction Chapter 5

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You can use the AUTO TCH even if the text contains parts that are not

dates, for automatically setting how images are captured. After using

AUTO TCH you would have to manually set the formats to recognize and

then use the

SEMIAUTO function.

Before using

AUTO TCH, there are a few parameters that need to be set

manually. These parameters are found in the

SETUP FLOW menu:

BANK Select in which bank to save the text formats and

parameter settings.

ORIENTTN Specify in which direction to read the text.

SHTRLIMT Specify the longest allowed exposure time, to avoid

blurred images if the objects are moving.

TRAPEZID Specify the angle from the text to read at which the CVS4

is mounted (see

E

).

DATEFRMT Specify in which order the year, month and day appears

in date strings.

You should also check that the internal calendar in the

CVS4 is cor-

rectly set. The clock is set by selecting

CALENDAR in the main menu.

When executing

AUTO TCH, the CVS4 will capture images of the object

and analyze them in order to nd suitable settings. When done, one

of the following results will be displayed:

b

COMPLETED Detected characters and set the necessary

parameters. If the text consists of dates, the

device should be ready for use.

b

STRING NOT FOUND Unable to detect characters on the object.

b

FORMAT NOT FOUND Detected characters but did not recognize text

as date.

b

DATE OVERFLOW Recognized date but the date is more than

5 000 days in the future, according to the

internal calendar.

b

DATE UNDERFLOW Recognized date but the date is more than

999 days in the past, according to the internal

calendar

The

AUTO TCH function can also be executed by pressing the TEACH

button > 3 seconds.

After using

AUTO TCH, you should verify that the CVS4 recognized

the right formats by checking the parameters

FORMAT 1 – FORMAT 4. If

not (which would be the case if the text contains parts that are not

dates), or if the auto teach function did not complete the set-up,

you should continue with the

SEMIAUTO function. If the result is DATE

OVERFLOW

or DATE UNDERFLOW, also check the DATEFRMT parameter and

the internal calendar.

Chapter 5 Operating Instruction

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12 ©SICK AG • 2011-04 • Advanced Industrial Sensors • www.sick.com

5.3 Semi-auto Teach (SEMIAUTO)

The SEMIAUTO function is useful if the AUTO TCH function was unable to

recognize text in the image, for example if the text to verify consists of

parts other than dates automatically recognized by the

CVS4.

Before using

SEMIAUTO, there are a few parameters that may need to

be adjusted. These parameters are usually set by the

AUTO TCH func-

tion, but their values may have to be adjusted to properly recognize

the text:

FORMAT1–4 Manually set which text formats that the CVS4 should

recognize. If set to

- - -, the CVS4 will try to recognize the

text as dates.

LIGHTPWR Set the brightness of the built-in lighting, to get a better

image.

SHUTTER Set the exposure time, to get a better or sharper image.

LUSTER Set how much the image should be compensated for

reections.

THRESHLD Set the threshold level that is used for separating the

characters from the background in the image.

DOTCHECK Specify whether or not dates should include separators,

for example dots (“.”) or hyphens (“-”).

ZEROCHCK Species whether or not the numbers for year, month,

day, hour and minute in dates and times should have

trailing zeros (06-03-31 or 6-3-31).

If

AUTO TCH has not been used, you must also set the parameters

listed in chapter 5.2 “Auto-teach”.

The

SEMIAUTO function gives the same types of results as AUTO TCH.

After using

SEMIAUTO, you should check the date ranges, time ranges,

and the string to judge as

OK, by checking the parameters 1/2-DAYOFS,

1/2-DAY±, 1/2-TIMOFS, 1/2-TIME±, and the STRING editor respectively.

If

SEMIAUTO could not complete the set-up, you should continue with

the

DATE TCH function, and especially check the parameters BOLD

and

CHARWDTH. Use the character cut-out view (

G

c

) to see what the

device recognizes as being characters in the image, and the monitor

mode (

H

3

) to see which characters the device tries to recognize.

Operating Instruction Chapter 5

CVS4

©SICK AG • 2011-04 • Advanced Industrial Sensors • www.sick.com • 13

5.4 Date Teach (DATE TCH)

The DATE TCH function is used for setting the dates, times or strings

that should be judged as

OK. This function can be useful if the

SEMIAUTO was unable to recognize the text.

Before using

DATE TCH, the CVS4 must properly cut out and recognize

the characters. This can be achieved by manually adjusting the

following parameters. Use the monitor mode to see exactly how the

characters are cut out.

BOLD Set compensation for character line thickness. Increase

if the characters appears too thin in the image, decrease

if too thick.

ROTATE Set the maximum angle for rotating the image. Increase

if the characters cannot be cut out because the image is

still rotated.

SLANTOFS Set the normal slant angle of characters.

SLANT Set the maximum angle for the variation in character

slanting. Adjust

SLANT and SLANTOFS to better straighten

up slanted text.

CHARWDTH Set the normal width of a character. Increase if charac-

ters are divided into two, decrease if several characters

are considered to be one.

CHARHGHT Set the minimum height of a character. Characters lower

than this setting will be ignored.

CHARNARW Set the minimum width of a character. Characters

narrower than this setting will be ignored.

Depending on which text formats the device should recognize (set by

FORMAT1–4), the DATE TCH function will set the following parameters:

b Dates Sets the

1-DAYOFS and 2-DAYOFS parameters to the number

of days between the current date and the read date. The

parameters

1-DAY± and 2-DAY± are set only if the format is

a date without days and the parameter’s previous value

was 0.

b Times Sets the

1-TIMOFS and 2-TIMOFS parameters to the number

of minutes between the current time and the read time.

The parameters

1-TIME± and 2-TIME± are not affected.

b Strings Sets the

STRING in the string editor to the read characters.

Chapter 5 Operating Instruction

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14 ©SICK AG • 2011-04 • Advanced Industrial Sensors • www.sick.com

5.5 String Editor (STRING)

When recognizing strings (one or more FORMAT parameter is set to

STRG), you can see which string the CVS4 will recognize by selecting

STRING on the SETUP FLOW menu and pressing SET. Here you can also

manually change the string.

b Questions marks (“?”) are used as “wild cards” in the strings – that

is, any character in that position in the string is accepted.

b Underscores (“_”) are used for separating several string formats.

For example:

FORMAT 1: STRG

FORMAT 2: STRG

STRING

MAY???_156354A8

will accept the following texts:

MAY-01

156354A8

MAYHEM 156354A8

Note that if using the String + input for incrementing the string to

accept, it is the last character of the last string format that will be

incremented.

5.6 Parameters Set by Auto-, Semi- and Date Teach

When using any of the auto-, semi- and date teach functions, any

previously set parameter values will be overwritten as shown in the

following table:

Parameter Auto-teach Semi-auto Date Teach

1-DAYOFS, 2-DAYOFS x x x

1-DAY±, 2-DAY± x x x

1-TIMOFS, 2TIMOFS x x x

BOLD x x

CHARHGHT x x

CHARNARW x x

CHARWDTH x x

DOTCHECK x

FORMAT 1–4 x Only if set to - - -

LIGHTPWR

x

LUSTER x

ROTATE x x

SHUTTER x

SLANT x x

SLANTOFS x x

STRING Only if any FORMAT is STRG

SURFACE

x

THRESHLD x

Operating Instruction Chapter 6

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©SICK AG • 2011-04 • Advanced Industrial Sensors • www.sick.com • 15

6 Adjusting Parameters Manually

6.1 Image Capturing

b To manually set the exposure time, set the SHUTTER parameter in the

SETUP FLOW menu.

 A longer exposure time will result in brighter images, but may

become blurred if the object is moving. A recommended exposure

time can be calculated with the following formula:

10 x required line width (mm)

Object speed (m/s)

SHUTTER

=

 When using the

AUTO-TEACH function for setting up the CVS4, the

SHTRLIMT parameter is used for specifying the longest allowed

exposure time, which can be calculated with the same formula as

for calculating shutter time.

b To manually set the contrast between characters and background,

set the

THRESHLD parameter in the SETUP FLOW menu. A high value of

the threshold level will reduce the impact of noise in the image, but

may make the characters thin and difcult to recognize.

Threshold too low.

Background is part

of the text.

Threshold too high.

Characters are thin

and unstable.

Threshold OK.

b To reduce the impact of reections or shadings in the images,

adjust the values of the following parameters:

 Reections

LUSTER SETUP FLOW

 Shades SHADING ADJUSTMENT

 Setting a parameter to 0 means no compensation.

Chapter 6 Operating Instruction

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16 ©SICK AG • 2011-04 • Advanced Industrial Sensors • www.sick.com

b The WIDE parameter can be used for increasing the height of the

eld-of-view of the device, or to reduce the response time:

ON Doubles the height of the eld-of-view, but uses the same

number of pixels, resulting in half the resolution in height.

FAST Reduces the response time by capturing images of the

normal eld-of-view, but using half the amount of pixels.

The resulting images has half the height resolution, but

are captured in approximately half the time.

FST2 Same as FAST, but captures and judges two images with

approximately 13.3 milliseconds between them. If any of

these two images are judged

OK, the object is considered

OK as well.

Normal (OFF) WIDE FAST / FST2

6.2 Transforming Images

The captured images may need to be transformed – to straighten up

the text making it easier to recognize – due to the angle at which it is

mounted, the objects may be rotated and the text may be slanted.

TRAPEZID

SLANTOFS

SLANT

b Set the angle at which the CVS4 is mounted from

the printed surface by setting the

TRAPEZID parameter in the SETUP

FLOW

menu.

 The

CVS4 uses this setting to remove the perspective on the text.

b To set a limit for how much the

CVS4 can rotate an image, set the

ROTATE parameter in the SETUP FLOW menu to the maximum allowed

rotation.

b For slanted text, set the angle that the text is normally slanted by

the

SLANTOFS parameter in the SETUP FLOW menu.

 Set the interval of the text slant by setting the

SLANT parameter

in the

SETUP FLOW menu to the maximum angle that the text slant

Operating Instruction Chapter 6

CVS4

differs from the angle set by SLANTOFS.

b If the image is judged as

NG, the CVS4 can slant the image some

more and then retry recognizing text. The

RE-SLANT parameter in the

ADJUSTMENT menu species whether or not to re-slant the image,

and the maximum angle to slant the text when re-slanting.

b To rotate the image 180° or to mirror the image, set the

ORIENTTN

parameter in the

SETUP FLOW menu.

b To mask out parts of the images – for example in which text should

not be recognized, or that contains objects that should not be

confused for text – set the parameters

MSK LEFT, MSK RIGHT, MSK UP

and

MSK DOWN in the ADJUSTMENT menu.

 Note that characters that are inside the masked-out area is not

recognized at all, since the mask reduces the eld of view of the

device.

 A mask can also be used when teaching to easier detect relevant

text. After teaching, remove the mask to make the

CVS4 search for

the text in the entire eld of view.

6.3 Recognizing Text

In order to properly recognize the characters in the image, certain

text characteristics must be specied in the

CVS4, such as line thick-

ness and character metric.

CHARHGHT

CHARWDTH CHARNARW CHRSPACE

b To adjust for the thickness of the character lines, set the BOLD

parameter in the

SETUP FLOW menu. A high value is recommended

for thin or dot characters, and a low value for bold text.

b To set the typical width of a character, set the

CHARWDTH parameter

in the

SETUP FLOW menu to the width in pixels. Characters that are

more than twice this wide will be divided into two. You can see

exactly how the characters are cut out in monitor mode.

b To set the minimum width of the characters, set the

CHARNARW

parameter in the

SETUP FLOW menu to the width in pixels. Characters

with a width smaller than this setting will not be recognized as

individual characters. This setting can be useful for avoiding noise

to be detected as characters, but a too high value can make it

difcult to recognize small characters such as “.” and “1”.

b To set the minimum height of the characters, set the

CHARHGHT

parameter in the

SETUP FLOW menu to the height in pixels. Charac-

ters smaller than this height will not be recognized.

Chapter 6 Operating Instruction

CVS4

b If the text consists of several text formats on the same row, the

CHRSPACE parameter in the ADJUSTMENT menu species the smallest

distance between the text formats as a multiple of the value of the

CHARWDTH parameter.

b If the text is brighter than the surface (white text on black background),

set the

SURFACE parameter in the ADJUSTMENT menu to WHIT.

b If you are using an extended dictionary containing custom

characters to be recognized, the

EXPDCTNR parameter in the

ADJUSTMENT menu species the number of extra characters to use

for recognition. The extended dictionary can be built up from a

PC

and loaded into the

CVS4.

b To adjust the required likeness of a character in the image

compared with the reference characters, set the

CHARMRGN

parameter in the

ADJUSTMENT menu. The likeness is a value between

0–255, where 0 means a perfect match. When running, characters

whose likeness value is above

CHARMRGN are displayed as “?” in the

recognized string.

6.4 Interpreting and Judging Text

You can see how the CVS4 recognizes and judges the text currently

in view, by looking at the judgement results on the display (see

H

).

Switch between which format is being shown by pressing

UP and

DOWN in monitor mode.

b To specify in which order the year, month and date appears in the

dates, set the

DATEFRMT parameter in the SETUP FLOW menu. If this

parameter is not properly set, the

CVS4 may give unpredictable

judgement results when judging dates.

b To specify the text formats that the

CVS4 should recognize, set the

parameters

FORMAT1 to FORMAT4 in the SETUP FLOW menu.

b To set an range of dates that should be judged

OK, set the param-

eters

1-DAYOFS, 1-DAY±, 2-DAYOFS, and 2-DAY± in the ADJUSTMENT menu.



1-DAYOFS and 2-DAYOFS sets the target date as a number of days from

the current calendar date, and

1-DAY± and 2-DAY± species the range

around the target date.

 The parameters

1-DAYOFS and 1-DAY± corresponds to the rst date

format that is set with the

FORMAT parameters, and 2-DAYOFS and

2-DAY± corresponds to the second date format.

b Similarly, to set a time interval that should be judged

OK, set the

parameters

1-TIMOFS, 1-TIME±, 2-TIMOFS, and 2-TIME± in the ADJUSTMENT

menu.

SETUP FLOW

INITIAL

BANK

ORIENTTN

SHTRLIMT

TRAPEZID

DATEFRMT

AUTO TCH

FORMAT1

FORMAT2

FORMAT3

FORMAT4

LIGHTPWR

SHUTTER

LUSTER

THRESHLD

DOTCHECK

ZEROCHCK

SEMIAUTO

STRING

BOLD

ROTATE

SLANTOFS

SLANT

CHARWDTH

CHARHGHT

CHARNARW

DATE TCH

ADJUSTMENT 1-DAYOFS

2-DAYOFS

1-DAY±

2-DAY±

1-TIMOFS

2-TIMOFS

1-TIME±

2-TIME±

CHARMRGN

CHRSPACE

EXPDCTNR

MSK LEFT

MSKRIGHT

MSK UP

MSK DOWN

MONTHCHR

RE-SLANT

SHADING

SURFACE

OTHERS

BANKCOPY

COMMUNIC

EXTLGTPW

LCD VIEW

LIGHT

OFFDELAY

ON DELAY

ONESHOT

OUTSYNDL

STRING +

SYNCDELY

SYNCHRO

SYNCPULS

WIDE

VIEW NG LOG

CALENDAR

brn

blu

ora/

blk

pnk

vio

blk

yel/

blk

red/

blk

L+

Bank switch 0/

Encoder input

M

Bank switch 1/

String +

Bank switch 2/

External teach

Bank switch 3/

External synchronization

Q

Auxiliary Q

B

YELLOW Affects all banks

VIOLET Affects current bank

ORANGE Function

BLUE Locked parameter

RED Value being edited

A

1 2

1

Parameter

(Aects bank)

Values Default Description

1-DAYOFS

2-DAYOFS

(current bank)

-999 –

5000

0 Sets the date offset – that is, the number of days between

the current date (as set by

CALENDAR) and the target date.

1-DAYOFS corresponds to the rst FORMAT parameter that has

a date format, and

2-DAYOFS corresponds to the second.

Use together with the

1-DAY± and 2-DAY± to set a range of

dates that are

OK.

1-DAY±

2-DAY±

(current bank)

0 – 1000 0 Sets the number of days before and after the target date (set

by

1-DAYOFS and 2-DAYOFS) that are considered OK.

1-TIMOFS

2-TIMOFS

(current bank)

0 – 1439 0 Sets the time offset – that is, the number of minutes after

the current time that is the target time.

Use together with the

1-TIME± and 2-TIME± to set a time

interval that is

OK.

To set the target time to before the current time, set

TIMOFS to 1440 - (minutes before current time).

1-TIME±

2-TIME±

(current bank)

0 – 720 30 Sets the number of minutes before and after the target time

(set by

1-TIMOFS and 2-TIMOFS) that are considered OK.

BANK 0 – 15,

TCH,

BKIN

Sets which bank that should be used for recognition or for

saving new pattern.

0 – 15 The number of the bank to use.

TCH Bank is selected externally. The Bank switch 2

input (pink) is used for activating external teaching,

therefore the banks 4 – 7 and 12 – 15 cannot be

selected. (See

K )

BKIN Bank is selected externally. External teaching is

disabled, therefore the Bank switch 2 input can be

used for selecting banks. (See

K )

BANKCOPY 0 – 15 0 Used for copying the settings in the current bank to another

bank.

To copy the current bank, set this parameter to the bank

number to which to copy and press

SET.

BOLD

(current bank)

-2 – +8 0 Use to adjust the thickness of the lines in the characters, in

order to improve recognition. Increase the value for thin or

dot characters, decrease for bold characters.

CHARHGHT

(current bank)

0 – 200 50 Sets the minimum height of a character in pixels. Characters

with a height equal to or lower than this value will be ignored.

C

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SICK CVS4 OCR Vision Sensor Software Version 1.0 Operating instructions

SICK CVS4 OCR Vision Sensor Software Version 1.0 Operating instructions

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