In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:

I would use an LM1881 sync seperator IC to get the timing of each scanline. 
Then you are going to need a fast comparitor or a flash A/D (4 bit would probably work) to test whether the pixel is dark or light.
The comparitor could be a bit touchy.

Basically,
  Wait for vertical sync. Count lines until you get to the scanline your interest in. Wait till the pixel (horizontal) is being sent and capture the value of the flash A/D. Then compare the value to see how dark/light it is.

  It's not going to be easy, but it is doable.

Bean.

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