hello
I have a few questions about using gamma module.
Question1.
The input format of IFIFE moudle is 12bit grayscale image.
Below, I got answer in this forum for gamma module.
I have a question about 12-bit input format.
We get 12-bit data of the camera. But I think that the gamma module use only the msb 9bits in 12-bit data.
What is the meaning of the 0x0005(the lsb 3bits) in the value 0x0B15?
Could you let me know how to make 12 bit format
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For example, if you have a 12-bit input data with a value of 2837, which is 0xB15 in hex value, you'd first down-shift the data by 3 to get the index to the gamma look-up-table, which is 0x162 in this case, or 354 in decimal.The lsb 3bits of the data, which is 5, is upshifted by 3 to yield 40.
Now assume your gamma[354] entry has a offset value of 719 and a slope value of 2.
The final output from the gamma table operation will then be:
clip(719+((2*40)>>6)) = 720.
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Question2.
So, i make up 12 bit data that the msb 9 bit data is camera data and the lsb 3 bit is 0.
In this case, there is contour line in image, too.
I think that this case is caused by the lost of lsb 3 bit.
Am i wrong? If then, Could you let me know the reason? or How can I solve this problem?
Question3.
When I use the gamma module, the contrast of the image get lower compared to not using gamma module.
i think that this problem is caused by the clip, 12bit to 10bit.
Is this right? Then, how to i can solve?
Actually, I need to used edge enhancer in IPIPE module.
So I have to use gamma module in IPIPE module.
If you have other solution, then let me know it, please.
Thanks
