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Recognize these test patterns?

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Cause I don't. They are from the end of "The Ultimate Oz" LaserDisc.

Just going by the effect I see, I'm guessing they are supposed to test comb filter performance. For the first 3 frames in each case, the image has those checkerboard grids. Then random specks pop in and out along a "solid" background for the rest of the pattern.

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