HDR_NUM_INPUT_FRAMES
for (i = 0; i < HDR_NUM_INPUT_FRAMES - 1; i++) {
s32 match_shift[HDR_NUM_INPUT_FRAMES -
s32 match_mul[HDR_NUM_INPUT_FRAMES -
s32 thr_low[HDR_NUM_INPUT_FRAMES -
s32 thr_high[HDR_NUM_INPUT_FRAMES -
s32 thr_coeff[HDR_NUM_INPUT_FRAMES -
s32 thr_shift[HDR_NUM_INPUT_FRAMES -