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YUV to RGB conversion in OV7620

Hello,

I am deveolping a VHDL code to get a image from a OV7620 camera. Until now I have managed to get YUV image in a binary file. When I display that image the Y component is correct (monochrome image) but the problem is in U and V components.

The whole image is all magenta because there isn't green component. I am using CCIR 601 YCbCr color space with formula:

R = 1.164(Y ? 16) + 1.596(Cr ? 128) G = 1.164(Y ? 16) ? 0.813(Cr ? 128) ? 0.391(Cb ? 128) B = 1.164(Y ? 16) + 2.018(Cb ? 128)

Registers setup are in default mode except for QVGA mode (bit 5 register

14) and CCIR 601 YCrCb (bit 7:6 register 67).

Thanks.

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Reply to
jvpiera
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Make sure you are getting U and V correctly some devices habe a bit in one of the registers to determine if the first clock edge is U or V.

Does that model of sensor support a test colour bars output mode. If so use it to set up your colour decode circuit.

Your data stream could be swapped because you are clocking out of phase.

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