Overview IRI 5331-02 User manual

Brand
Overview
Model
IRI 5331-02
Type
User manual

This manual is also suitable for

IRI 5300 Series User Manual
Overview Ltd.
55 Bendon Valley, London, SW18 4LZ
+44 (0)208 875 0984 [email protected]
www.overview.co.uk
This product may be protected by patents RE36136, RE36706, US4752694, US5300915, US5420419, US5895233.
©Overview Ltd 2015 No part of this publication may be reproduced without prior permission in writing from Overview Ltd. Whilst Irisys will endeavor to ensure that
any data contained in this product information is correct, Overview Ltd. do not warrant its accuracy or accept liability for any reliance on it. Overview Ltd. reserve
the right to change the specification of the products and descriptions in this publication without notice. Prior to ordering products please check with Overview Ltd.
for current specification details. All brands and product names are acknowledged and may be trademarks or registered trademarks of their respective holders.
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Contents Page
1. Introduction. ................................................................................ 4
2. Contents and options. .................................................................. 4
3. Physical Dimensions. ................................................................... 5
4. Electrical Connections .................................................................. 7
5. Initial use and Set-Up .................................................................. 7
6. Settings ....................................................................................... 9
7. Advanced settings ...................................................................... 12
Appendix 1 – Serial Protocol ........................................................... 14
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1. Introduction.
This document describes the set up and use of the IRI 5300 series thermal imaging camera cores.
Please note that the camera core provide thermal images as the output and not radiometric data.
2. Contents and options.
Pleases note the contents of the camera will depend on the camera core, the options and the
accessories ordered. The first tables below show the camera cores and options and the second
table shows the accessories.
Figure 1. 15mm Lens Figure 2. 45mm Lens
2.1. Camera Cores
Part Number
Lens FOV /
Diameter
Case
Video Output Type -
and Scan rate
IRI 5331-01
35° X 26° / 15mm
Standard
PAL - <9Hz
IRI 5331-02
35° X 26° / 15mm
Standard
NTSC - <9Hz
IRI 5339-01
35° X 26° / 15mm
Standard
PAL - 25Hz
IRI 5339-02
35° X 26° / 15mm
Standard
NTSC – 30Hz
IRI 5371-01
12° X 9° / 45mm
Standard
PAL - <9Hz
IRI 5371-02
12° X 9° / 45mm
Standard
NTSC - <9Hz
IRI 5379-01
12° X 9° / 45mm
Standard
PAL - 25Hz
IRI 5379-02
12° X 9° / 45mm
Standard
NTSC – 30Hz
IRI 5301-01
No Lens
Standard
PAL - <9Hz
IRI 5309-01
No Lens
Standard
PAL - 25Hz
2.2. Accessories
Part Number
Description
IWI 4411
100-240VAC to 12VDC Power Supply
IWI 5417
Keyboard
IWI 5418
Configuration kit- Set-up software and USB Serial set-up module.
IWI 5319
¼” BSW tripod adaptor
IWI 5520
Hard coated Germanium window for camera housings with 15mm lens.
IWI 5521
Hard coated Germanium window for camera housings with 45mm lens
IWI 5522
High Sensitivity array upgrade
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3. Physical Dimensions.
Figure 3 . Standard case dimensions
Figure 4 . Dimensions of standard case with 15mm Lens.
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Figure 5 IWI 5520 15mm Window
Figure 6 IWI 5521 45mm Window
Both the 15mm and 45mm windows have an uncoated area on the inside. (Labeled side 2 in
Figure 5 and Figure 6). The other difference between the inside and the outside is that the
outside of the window is dark in appearance; whilst the inside shows rainbow hues when the light
strikes it at different angles.
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4. Electrical Connections
4.1. The electrical connector is a Sauro CIM 7 way straight polarised male connector. The part
number for this connector is CIM070P5.
Pin connections for the CIM070P5
Pin Number
Label
1
12V
2
0V
3
RX RS232
4
TX RS232
5
Comms. RTN
6
A RS485
7
B RS485
4.2. The part number for the corresponding female connector is the Sauro 7 way plug
CVF070R5.
4.3. Video. The video output connector is a standard 75ohm BNC jack.
4.4. Set-up module.
To enable the camera settings to be adjusted a set up module (IWI5418) needs to be
connected to a PC and the Camera. For full details see section 5.2 below.
5. Initial use and Set-Up
5.1. Initial use.
5.1.1. Connect a 12 volt power supply to the camera using the Sauro 7 way plug CVF070R5.
5.1.2. Use a BNC cable to connect the BNC jack to a suitable display and or video recorder.
5.1.3. Switch on the power to the camera. You can now view and or record the thermal images.
Note: On start up the shutter will operate more frequently.
5.2. Basic Set-up.
To adjust the settings in the camera; to load up and change the factory settings and connect
to a PC.
5.2.1. Connect the USB setup module (IWI 5418) to the female Sauro connector. The USB
module has a power supply socket and a USB socket.
5.2.2. Connect the 12 supply to the USB module.
5.2.3. Connect the PC to the USB module using a suitable USB cable.
5.2.4. Switch the power on.
5.2.5. Start up the PC configuration software. (Start up screen shown in Figure 7)
The set up software allows you to:-
i. Write new settings to the imager.
ii. Load the existing setting from the imager.
iii. Saves settings to a file and load an existing set of settings from a file.
Section 6 and 7 provide more details about settings and display modes.
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Figure 7 Start up Screen Shot
5.3. Communication between Imager and PC
5.3.1. Click on the “load set up from imager” button.
5.3.2. This will load up the imager communication configuration dialogue box. See Figure 8.
5.3.3. Selecting Auto Detect, will check the ports and confirm they can be connected to. Ensure
that a port from the available ports box is selected and then click OK.
5.3.4. Alternatively select a port from the available port box and click OK.
5.3.5. To test if as port works, select it from the available port box and click on test port
5.3.6.
Figure 8 Communication dialogue box.
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6. Settings
Selecting the Basic tab gives the screen as shown in figure 7.
Figure 9 Basic Tab Screen shot.
6.1. Power
Allows the unit to be turned on and off.
6.2. Freeze image
Allows the image to be frozen.
6.3. Colour palette
Allows the selection of different colour palettes to suit the user.
6.4. Shutter
Allows the shutter to be operated automatically or turned off. In auto mode the shutter
operates more frequently when switched on until the electronics warm up and stabilise. It
will then shutter as required and at least once every 18 minutes.
6.5. Tracker
This displays a green box on the screen which tracks the hottest point in the scene.
6.6. Display mode
Relates to the gain and offset settings of the display. The IRI 5300 series cameras offer
both automatic adjustment and manual adjustment of the gain and offset to display the
scene. The gain is equivalent to altering the contrast of the image and the offset is
equivalent to brightness. Select between Manual mode and auto mode.
6.6.1. Automatic mode.
There are three types of automatic gain settings available. The Advanced settings section
provides more details of the extra settings available for the automatic modes. Example
images are shown in Figure 10 to Figure 16.
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6.6.1.1. Linear(Mean)
In the Linear Mean mode the gain and offset are defined by the mean value of all the
temperatures in the selected region.(see section 7) Therefore when a hot or cold object
enters the scene there is little change in the brightness and contrast of the image.
(Figure 10 & 11)
6.6.1.2. Linear(Median)
In the Linear Median mode the maximum and minimum temperatures in the scene are
used to define the gain and offset of the displayed image. Therefore when a hot or cold
object enters the scene the brightness and contrast change rapidly to highlight the
object. (Figure 12 & 13) This setting can be altered further. – See section 7.
6.6.1.3. Histogram
In histogram mode the colours displayed are based on the temperature histogram of the
scene. As the display is dominated by the background, when a hot or cold object enters the
scene there is very little change in the brightness and contrast, making this mode more
suitable for video content analysis requiring a stable background scene. (Figure 14 & 15). For
more setting details see section 7.
Mean
Figure 10. No object in Scene. Figure 11. Hot Objects in Scene.
Median
Figure 12. Small object in Scene. Figure 13. Hot Objects in Scene.
Histogram
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Figure 14. Small object in Scene. Figure 15. Large hot object in Scene.
6.6.2. Manual Mode
The user defines the gain and the offset. This is primarily used on a temporary basis to look
at a specific event in order to get more details from the scene. It should not be used
continuously, because when other objects appear in the scene the image will no longer have
the optimal gain and offset settings. See example images in Figure 16 to 21 below.
Standard gain and offset Reduce gain
Figure 16. Standard gain and offset Figure 17. Reduce gain
Offset moved up
Figure 18. Std. Gain Figure 19. Reduced gain
Offset moved down
Figure 20. Std. gain. Figure 21. Reduced Gain.
6.7. Digital zoom.
Allows the user to zoom into different parts of the scene. The x/y co-ordinates and the 4
cursor buttons allow the user to move around the display of the scene.
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7. Advanced settings
Selecting the advanced tab gives the screenshot as shown in Figure 22.
Figure 22 Advanced tab Screenshot.
7.1 Display Mode Settings.
7.1. Linear(Median) and (Mean)
The user can define a smaller region of the scene over which the auto gain settings are
used. The two choices are a Rectangle region and triangle region. The user can also define
the size of both shapes using the parameter boxes. In addition the user can also limit the
gain used in this mode and the limit the offset. (i.e. the maximum and minimum values of
the temperatures.).
Auto region set-up – The auto region is set up so that the user can exclude specific parts
of the scene from being included in the gain and offset calculations. For e.g. by reducing
the auto region from the top part of the scene, the sky can be excluded. Equally parts of
the scene with high contrast can be excluded from the auto region.
Note: This setting dialogue box is only available when the median mode is selected.
However the region selected will apply when switching to the mean mode.
Gain:
Minimum value is 0.
Maximum value is 2047. This is equivalent to 2 times.
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Offset:
The output from the detector is converted into a 16 bit number. The full range of the
output is very approximately equivalent to +250°C to -50°C.
Note: The unit is not calibrated.
Minimum offset: -32768. Equivalent to the lowest temperature.
Maximum offset : 32767 Equivalent to the highest temperature.
Note: Please use this with caution and we recommend trial to get the optimum result. In
addition on a shutter the values and the display can shift.
7.1.2 Histogram.
Four histogram settings are available. As the histogram mode operates on the temperature
histogram of the scene, the choices provide different weighting factors to the histogram.
Allowing more weighting to either the colours in the middle of the temperature range or to
the colours at the outer ends of the range.
7.2. Temporal filter: Can be set between 0 to 8. This is the number of frames over which the
auto gain operates. Hence a fleeting event can be ignored.
7.3 Spatial filter: Number of pixels which must see the maximum or minimum temperature for
inclusion in the gain calculations.
7.4. Tracking.
When tracking is selected, a green box tracks the highest temperature pixel. If there is a
requirement to restrict this to part of the scene the track box numbers can be used to define and
restrict the tracking area.
7.5. Rotate
Allows the user to flip the image. Useful when the core is mounted in another housing. For e.g. if
the housing is ceiling mounted, the image will need to be flipped to be the right way up.
7.6. Power-up mode
Allows the user to set the camera to switch on up when the power supply is plugged in. This is the
default mode. If start in “standby” is selected then the camera does not switch on when the power
supply is plugged in. The user then has to send a command to switch the camera on.
7.7. RS485 Bus settings
It is possible to daisy chain up to 16 cameras on a single RS485 bus. This allows the setting of
addresses to each camera. Also in this instance the termination camera needs to be defined.
7.8. User text
Allows the user to add text to multiple cameras to identify the data coming back more easily. For
e.g. “Car Park”.
7.9. Camera Baud rate
Allows the user to change the baud rate used to communicate with the camera. The camera has
to be power cycled and the software has to be restarted to take effect.
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Appendix 1 – Serial Protocol
IRI5300 SERIAL COMMANDS
V15c – FPGA V10 pic ver 05
Settings to be used for the serial communication
Default Baud
96001
Parity
None
Data bits
8
Stop bits
1
Hardware flow control
None
Note 1. The baud rate can be set to other values. See commands below.
Data and command formats
All commands sent to the camera will start with a left chevron - ‘>’ (also known as the PC
transmit header)
All responses received from the camera start with a right chevron - ‘<’
All commands and responses send and received are in ASCII hexadecimal format.
Up to 15 cameras can be attached to the serial RS485 comms bus.
The address of each camera is defined by the ACII character 1 to F 2.
Note 2: All cameras will respond to address ‘0’.
Data, is normally sent in upper case ASCII hexadecimal.
Data, is normally received in upper case ASCII hexadecimal.”
Commands
Commands sent to the camera are acknowledge with a ‘<’ followed by the command character
(For e.g. >0$1 returns <$. Where the $ represents the command).
>0$a Program the camera. The address of the camera a = ‘1’ to ‘F’
>0P Power up from standby
>0p Power down to standby
>0x Set to power up immediately (default)
>0X Set to power up in standby mode
>0O RS485 Termination On (defaults to on)
>0o RS485 Termination Off
>0`x Set baud rate, x = 0 to 4 or 9.
0=9600
1=19200
2=57600
3=115200
4= 1200
9= 2400.
Requires hard reset
>0W save configuration data
The following response acknowledge when write to flash is complete. <W
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Basic Operation:
>0r Pause image
>0R Resume image
>0cx Select colour palette where x = 0 to 5
0 = white hot, 1 = black hot, 2 = ironbow
3 = inverse ironbow, 4 = red-black, ‘5 = black-red
>0ZLxxxyyy Zoom mode where L = zoom level 0 to 2,
0=X1, 1=X2 2=X4
xxx,yyy = top left corner of picture.
For e.g. >0Z2080080
For L= 0 i.e. zoom x1 the top left hand position xxxyyy is not
required, e.g. >0Z0
Advanced Operation:
>0S Operate Shutter
>0sx Toggle x = 0 or 1. 0=Auto; 1=Manual shuttering. (default auto)
>0~ Close shutter (toggles)
>0&x Display x = ‘0’ (histogram), ‘1’ (auto gain & offset), ‘2’ (manual), ‘3’
(mean based offset, histogram bin based gain)
>0awwwxxxyyyyzzzzFf Auto gain and offset controls: www=gain max, xxx=gain min
yyyy=offset max, zzzz=offset min, F = temp filter, f = spatial filter
Offset limits are in 2’s complement signed
>0b0wwwxxxyyyzzz autobox rectangle www,xxx,yyy,zzz = top,bottom,left,right
>0b1wwwxxxyyyg autobox triangle www,xxx,yyy,g = top,bottom,middle,gradient
>0mxxxyyyy Manual mode xxx=gain, yyyy=offset in 2’s complement signed
>0@wwwxxxyyyzzz Set tracker box with coordinates www,xxx,yyy,zzz =
top,bottom,left,right
>0T Tracker on
>0t Tracker off
>0M0123456789ABCDEF Program location string (16) to ram
>0vx Cycle through 4 different histogram curves x = ‘0’ to ‘3’
>0,x Rotation. x is either ‘3’ (default) or ‘0’. Follow with 'W' to save and
then reboot
>0j power down video DAC
>0J power up video DAC
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Contrast Schemes
Infrared detectors produce an analogue voltage for each pixel intensity, which is converted by means
of an analogue to digital converter to a digital number. For the best possible image, the digital number
must have enough bits of precision to represent the smallest temperature change that the detector can
see (often 14 or 16). A signed 16 bit number has a range of -32767 to +32768, but many display
devices have an 8 bit greyscale input range of 0 to 255. The method of mapping the detector output
range onto the display input range will effect how the image appears, and this mapping is what we call
a contrast scheme.
Let’s say an image has a histogram (number of pixels vs pixel intensity) as shown below:
Median
Possibly the most straightforward contrast scheme would be to find the hottest object in the scene and
assign it white colour (255) and the coldest object in the scene and assign it black colour (0), and
distribute the 256 greyscale levels linearly, perhaps ignoring a number of outliers at both ends of the
histogram.
The means of achieving this is to subtract an offset to centre the image around the midpoint of the
detector output range, and then to multiply by a gain to stretch or shrink the image to fit into the
display input range.
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The offset required in this case is (max + min)/2, which is an approximation to the median, (the real
median is computationally intensive to calculate) so we call this the median contrast scheme.
The median contrast scheme is strongly affected by targets appearing at either the hot or cold end of
the detector’s output range as shown in the following histogram which has two components separated
(bimodal histogram). This makes it very obvious that a hot target is in the scene.
This can be an advantage or disadvantage depending upon the requirements of the application. If the
target is a person against a 20C background, this can work well. However, if an object enters the scene
that is very hot compared to the background, such as a hot car exhaust or cigarette, it is possible to get
an almost binary image where the background appears dark and the hot target appears light, but
neither background nor target have a great deal of thermal detail visible. This can occur even if the hot
objects are very small in size. If the intention is just to detect hot targets this may be useful, but if
detail of the target is required, and detail of the background must be maintained, then this scheme is
not so useful.
Mean
We have therefore developed a contrast scheme where the image offset is calculated from the mean of
the pixels in the scene, and the gain is calculated from the variance (sum of the differences from the
mean) of the pixels in the scene.
Neither of these quantities are affected much by the addition of small hot or cold targets since the
effect is diluted by dividing by the number of pixels in the image.
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It is common to find that the image background retains its contrast (which could be an advantage over
the median scheme), and small hot targets appear completely white, which makes them easy to detect.
The hotter and smaller they are, the more likely they are to be completely white, with little colour
contrast across the target, for example on people’s faces. As the hot target increases in size (perhaps
by moving closer to the imager), the mean moves towards the mid point of the two modes of the
bimodal histogram. In this case the background has to make do with fewer colours to represent itself
whilst the target gains colours, and more detail can be seen.
This is a useful histogram to demonstrate the limitations of linear contrast schemes such as the median
and mean schemes. The colours assigned to intensities between the two histograms are unused. If the
foreground and background are at very different temperatures this becomes a significant waste of
display colours.
A similar problem occurs if the majority of the image is in a small range. Using a linear contrast
scheme will show little contrast in the majority of the image.
Histogram Equalisation
Histogram Equalisation attempts to solve this problem by displaying a more even number of pixels
with each available grey level. For example the histogram of an image with most of the pixel
intensities in the darker end of the greyscale can be transformed so that the colours are distributed
more evenly.
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The result is that much more detail is visible in areas that were previously represented by
comparatively few grey levels.
Plateau Histogram Equalisation
Histogram Equalisation can be a little severe in cases where the main body of the histogram is very
narrow and tall since details in the other parts of the histogram can be lost. A solution to this is to trim
the histogram at a plateau level L, which limits this effect.
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Overview IRI 5331-02 User manual

Brand
Overview
Model
IRI 5331-02
Type
User manual
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