TDA4VM: purple edge problem on TDA4

Hi Zhili,

Could you please share the raw sensor image?
There is only 1 bmp in the zip.
It looks more like WDR related issue from the bmp.

Hi Gang,

I have captured the raw image, please help me continue check this problem.

OVX3C-purple edge problem images.zip

Thanks.

BR.

Hi Zhili,

The purple edges around image corner are most likely due to chromatic aberration.

Is that what you are look at?

Yes, the purple edges in your snapshoot are likely due to CA, I learned that the CAC is supported in vpac3, is this can be solved in vpac3?

However, what I would like to know more is whether the purple edge around the highlight (such as the sun's reflection area, shown in below snapshoots) is also due to CA? 

wang zhili said:

Yes, the purple edges in your snapshoot are likely due to CA, I learned that the CAC is supported in vpac3, is this can be solved in vpac3?

Yes, this is correct.

wang zhili said:

However, what I would like to know more is whether the purple edge around the highlight (such as the sun's reflection area, shown in below snapshoots) is also due to CA? 

For the white car on left, it looks like due to sensor WDR merging.
On the other car on right, it is difficult for me to tell.

In general, if the cause is CA, artifacts will disappear if they are around image center.

wang zhili said:

Do you have any experience in this field? Can the problem be improved by modifying the gain of a particular frame?

No, I don't have much experience.
That starts with sensor settings and OVT may have much more experience.
It might be related to the split-pixel in sensor.
I have not worked much with WDR OVT sensors.