Scene change detection and handling for preprocessing video with overlapped 3D transforms

In one method embodiment, receiving noise-filtered plural blocks of a first frame and noise-filtered plural blocks of a second frame; for each of the plural blocks to be matched, determining whether an indication of closeness in match between the each of the plural blocks exceeds a first threshold; incrementing a counter value each time the first threshold is exceeded for closeness of the block matching of a particular block; determining whether the counter value exceeds a second threshold, the exceeding of the second threshold indicating that a defined quantity of blocks has exceeded the first threshold; and responsive to determining that the counter value exceeds the second threshold, triggering a scene change detection.