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Horizontal projection of binary image is insensitive at 0.5° because text rows look nearly identical. The real discriminator is vertical edge alignment: at the correct angle, word left-edges and column borders become truly vertical, producing sharp peaks in the vertical projection of Sobel-X edges. Also: BORDER_REPLICATE + trim to avoid artifacts. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>