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Reworking OpenCV's Mat with memory-mapped files: solving the problem of large images that don't fit in memory

Reworking OpenCV's Mat through memory-mapped files lets large images that don't fit in memory still be accessed through the Mat interface, with data still pointing to a contiguous uchar* in memory. Below the threshold, native heap allocation is still used and performance is unaffected; only genuinely large images switch paths, transparently to upper-layer callers.

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