AMS CMOSIS CHR70M Manual - Page 14

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CHR70M

Evaluation System Manual

4.4 C

OLUMN

FFSET

Because the offsets of the different channels can be different (and also the offsets of the PCB ADC's) it is

recommended to change the offset registers of every channel until an even image is received. Manually adjusting

these registers can be difficult, that is why the software provides an automatic calibration for this.

Follow the next sequence after you have loaded a certain (disable the multiplication factor when doing this):

1. Cover the lens/sensor so absolutely no light is coming through.

2. Set the exposure time low (1-5 line times). You will have an image that looks like the one below with column

non-uniformities in it and a bad histogram.

3. Click the GRAB CONTINUOUS button

4. Click the Column Offset Calibration button (it will light up)

5. You will now see that the offset registers are automatically adjusted with every frame and the image and

histogram becoming more and more even.

6. Wait until the image doesn't improve anymore (look at the standard deviation). This will take about 10

frames.

7. Click the Column Offset Calibration button again to stop the calibration (light will go out)

8. Click the GRAB CONTINUOUS button to stop grabbing. It is important to do this only after you have disabled

the calibration.

9. If you want to change the overall offset, just change the offset of one channel and look at the histogram until

you've set it to your liking. Now just change the offset registers of every other channel with the same amount

as that channel. See figures 3 & 4.

ALIBRATION

Version: v3

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