nx_jpeg_dequant_test.nx

nx_jpeg_dequant_test.nx -- KAT for dequant + un-zigzag composer. Construction: zz_coeffs[k] = k (0, 1, 2, ..., 63) quant_zz[k] = k + 1 (1, 2, 3, ..., 64) natural[un_zigzag[k]] = zz_coeffs[k] * quant_zz[k] = k * (k + 1) Cross-check against the published un_zigzag table for the first few positions: k=0 -> nat[0] = 0 * 1 = 0 k=1 -> nat[1] = 1 * 2 = 2 k=2 -> nat[8] = 2 * 3 = 6 k=3 -> nat[16] = 3 * 4 = 12 k=4 -> nat[9] = 4 * 5 = 20 k=5 -> nat[2] = 5 * 6 = 30 ... Also: end-to-end composition with the entropy decoder's output shape (zero-padded zig-zag block) yields a sparse natural block at the expected natural positions. expect_exit: 0 license_tier: ORIGINAL