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How to calibrate the CMOS sensor

Sathish
Intellectual 1950 points

Hi All,

One of the customer is using the DM355 in a HD video recorder, with the Micron MT9P001 cmos sensor. He wants to calibrate the sensor.

Please help if you have any info/ideas about below questions:

- How does DM355 support bad/dead pixels ?  How do we program this into
video encoder to ignore them ?
- How do we calibrate the white balance values ? I understand we need to
control the lux in a sealed chamber then read the sensor values as RAW.  We
then need to place this value somewhere in the DSP setup ?
- How does DM355 support dark calibration ? How do we program the black
level.

Thanks!!!

Regards

Sathish

  • 0
    TI__Intellectual 1870 points

    - bad/dead pixel

     DM355 can handle up to 2048 defect pixels (1024 in CCDC and 1024 in IPIPE).

     But  you need find the defect location and store it in the flash memory (as each sensor has different defect pixels). When camera runs, the table needs to be read and loaded to ISP.

    - If you talk about fixed WB, then you can use as you mentioned. Just use your target chart as Gray. If you talk about AWB, then please contact our imaging 3rd party to get support.

    - Simple method is using DC values. Capturing completely dark raw imageand measure the average values and put this number in the register (related to black clamping) in CCDC.

     

    Regards,

    Sang-Yong 

  • 0 in reply to SANG-YONG
    Prodigy 30 points

    Hi Sang-Yong,

    Thank you very much for your answer.

    We are using AWB and also need some help configuring ipipe settings:

    • def_cor
    • prog_nf
    • edge_enhancer

    etc.

    Could you please put us in touch with someone from your imaging team so we can see some examples of how to generate these tables during calibration, and how to configure these settings ?  Does TI have example code for this ?  

     

    Ben

  • 0 in reply to Ben Bodley
    TI__Intellectual 1870 points

    I am sorry for inconvienience, but due to IP issue, this cannot be handled in this forum.

    Please contact regional sales.

     

    Regards,

    Sang-Yong

  • 0 in reply to SANG-YONG
    Prodigy 30 points

    Thank you Sang-Yong.  

    Where abouts are your imaging team located so I can provide a reference for our local sales to communicate with ?

    Ben

  • 0 in reply to Ben Bodley
    TI__Intellectual 1870 points

    You can provide my name, then TI sales people can reach me.

     

    regards,

    Sang-Yong