Hi,
We have some questions about the capture module of the TDA3.
We have some questions about the capture module of the TDA3.
We are using a monochrome image sensor using CSI2. These sensors work at RAW10.
We got a capture-CSI2-display-HDMI loopback example to work on the TDA3EVM but the captured image is stored in U16 format (i.e. stored in 10 bit LSB. upper 6 bits are 0)
Because our algorithm is optimized for working in U8. We would like to capture these monochrome images as RAW8 (i.e. shift right two bits) and store it in U8 format.
What we've tried:
- We've tried to store these as U8 by setting the packing to U8 in the CAL module but the lower 8-bits of the RAW10 are stored and there is no shift by 2. We might be able to compensate for this by lowering the gain in the sensor by 1/4 but we have not tried this.
- Use the ISP to convert it to YUV402 and use the Y component as this is stored as U8. However we do not understand the implication of the Bayer RGGB conversion forced upon the IPIPE module. We do not know how much quality degradation this will give us in the end.
We have the following questions:
- Is there a simple way of capture monochrome RAW10 directly from sensor and store these as U8 shifted right by 2. Would it be possible to configure a DMA to do this conversion?
- Is there a way of treating the incoming monochrome RAW10 without the Bayer filtering?
- How is the Bayer filtering affect our monochrome input?
- Is there any other recommended way of handling this?
Jean
