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Sensor shutter?

DavidGarcia
Prodigy 230 points

Sorry if I describe my problem here! I use a EVM6437 with micron sensor MT9D131, and in my application I have to synchronize my VPFE with a encoder to capture images in fixed moments. Particulars that I have to capture move very quikly and consequently I use short integration time in my sensor, but I notice I suffer of rolling shutter. Do you have a tip to solve this problem? I probably set something wrong?

Thank you

 

  • 0
    TI__Mastermind 41665 points

    I am not sure I see the problem from your screen capture (is the paper meant to be vertical and the image is flipped?), however if you are getting rolling shutter effects I think the best place to ask about this would be the sensor manufacturer, as the way to lessen this sort of effect would be to decrease the time the sensor takes to capture the image such that the distortion is mimimal. Essentially if there is any way you can configure the sensor to capture the image faster that would probably help, I am not sure that there is anything that you could do from the DSP side to improve things.

  • 0
    Expert 1575 points

    Hi David,

    just one thing to add to Bernies post...: A rolling shutter sensor doesnt have a pixel storage - the DSP can do nothing about this. So you either use a global shutter one (maybe the quite cheap MT9V032 if the resolution is ok) or you try using snapshotmode with a flash ilumination triggered by the camera (in any case the sensor will remain open during readout of the pixels - so this is only possible if the only light source is your flash). The snapshot mode triggered capture has the additional disadvantage that you need to pretrigger it since the sensor needs to reset all the lines before the light is triggered (during the first Vblank after the trigger).

    bye,

    Thomas