Motion blur for short exposure times in DMM 42BUC03-ML about tiscamera

[TIS-Stefan]

Hello Tom

What you see is an effect of Shutter Efficiency of Global shutter sensors. The sensor manufacturer describes this effect in following PDF:
https://www.aptina.com/products/technology/Aptina_Global-Shutter-WhitePaper.pdf

So using a longer exposure time, between 1/500 and 1/1000 will give a better result.

Another good description of this phenomena can be found at:
https://www.cvl.isy.liu.se/education/undergraduate/tsbb09/lasmaterial/Amtel-Journal-Issue6.pdf

A rolling shutter camera wont have such an effect, but it has the "curtain" effect on horizontal movements.

BR
Stefan

[tommises]

Hi Stefan,

Thanks - I had no idea about shutter efficiency.

After familiarizing myself with the linked documents, I realized increasing frame rate would help, which I confirmed by comparing 7fps with 25fps. In that case, we could use a lower resolution with higher frame rate. It is unfortunate that the lower resolutions in DMM 42BUC03-ML are broken, as I reported in the recent comment to Issue #30. Any chance this will get fixed?

Alternatively, we could order DMM 22BUC03-ML, which has smaller resolution.

• I would like to know which resolutions and frame rates are actually available with the Linux firmware for this camera.
• Is the shutter efficiency in this lower-resolution sensor similar? As far as I can tell, this sensor is an older design, so I would not like to end up changing the camera, just to learn that despite a faster readout time, there is no improvement due to lower shutter speed efficiency.

Thanks,

Tom

[TIS-Stefan]

Tom

Sorry for the delay of my answer. These are the video formats and frame rates avaialble in Linux of the DxK 22:

Format 0 :  Greyscale 8-bit (Y800)  1
    744x480
        60/1
        30/1
        25/1
        15/1
    640x480
        60/1
        30/1
        25/1
        15/1
    320x240
        141/1
        120/1
        80/1
        60/1
        30/1
        25/1
        15/1

I also used a very short exposure time and 60 fps frame rate. I did not see the issue in my test.

Stefan

[tommises]

Stefan - Thanks for the resolutions and for doing the test.