void image_SSSE3_rgb_to_gray_8u(const uint8_t *in, uint8_t *out, int w, int h)
Convert a RGB image (3cu8) into a GRAYSCALE (1c8u) image, using Y=77*R+150*G+29*B.
void image_SSSE3_bgr_to_gray_8u(const uint8_t *in, uint8_t *out, int w, int h)
Convert a RGB image (3cu8) into a GRAYSCALE (1c8u) image, using Y=77*R+150*G+29*B.
void image_SSSE3_scale_half_3c8u(const uint8_t *in, uint8_t *out, int w, int h)
Subsample each 2x2 pixel block into 1x1 pixel, taking the first pixel & ignoring the other 3.
GLubyte GLubyte GLubyte GLubyte w
void image_SSE2_scale_half_1c8u(const uint8_t *in, uint8_t *out, int w, int h)
Subsample each 2x2 pixel block into 1x1 pixel, taking the first pixel & ignoring the other 3.
void image_SSE2_scale_half_smooth_1c8u(const uint8_t *in, uint8_t *out, int w, int h)
Average each 2x2 pixels into 1x1 pixel (arithmetic average)
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