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DLP6500FLQ: Bitplanes in video pattern mode

Part Number: DLP6500FLQ

Hi,

My question is regarding bit planes in video pattern mode. In this application, RGB image is shown on the DLP6500 through HDMI connector and the bit planes are changed every 20ms with a trigger output and the patterns are captured with camera and acquisition is repeated indefinitely. So it would be R0R1R2R3R4R5R6R7G0G1G2G3G4G5G6G7B0B1...B7R0R1....

I would expect the 1st image and 25th image would be exactly identical, similarly 2 and 26th and so on. Instead if I calculate correlation coefficient(i.e., similarity index with 1 being very similar), R0,G0 and B0 have very poor correlation coefficient and R7,B7 and G7 have well above 0.99 correlation. So all higher bit planes can generate stable images and can be repeated and they are identical but for lower order bit planes they produce nonidentical images. The trend of correlation for 1st and 2nd runs are shown below for each bit plane.

If correlation is less for all bit planes, I would suspect my imaging system but its only specific bitplanes that have low correlation.

How to make lower order bit planes more stable i.e., the correlation as high as higher order bit planes? or is it anything to do with graphics card?

I am happy to provide any other details which would help resolve my issue. 

Regards

Chai