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27 lines
915 B
C
27 lines
915 B
C
#ifndef BLACKBARS_H
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#define BLACKBARS_H
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/* Calibrated preset-0 edge probes on this G4. Return -1 for an ambiguous
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* or dark frame so darkness alone cannot switch the active capture mode. */
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static inline int letterbox_candidate(const unsigned black[16], const unsigned char color[16][3]) {
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const unsigned interior[] = {2, 6, 10, 15};
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unsigned lit = 0;
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for (unsigned i = 0; i < 4; i++) {
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unsigned r = interior[i], peak = color[r][0];
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for (unsigned c = 1; c < 3; c++)
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if (color[r][c] > peak)
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peak = color[r][c];
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if (black[r] < 20 && peak > 35)
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lit++;
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}
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if (lit < 2)
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return -1;
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unsigned top = (black[3] + black[11] + black[12]) / 3;
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unsigned bottom = (black[1] + black[5] + black[9]) / 3;
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if (top >= 55 && bottom >= 25)
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return 1;
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if (top < 20 && bottom < 20)
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return 0;
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return -1;
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}
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#endif
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