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introduce WebPPlaneDistortion to compute plane distortion

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Make WebPPictureDistortion() only compute distortion on A/R/G/B planes, not Y/U/V(A).
(not just for SSIM, but PSNR too).

This is to avoid problems with using SSIM on U/V channels.
If Y/U/V distortion is needed, one can always use WebPPlaneDistortion() individually.

Change-Id: If8bc9c3ac12a8d2220f03224694fc389b16b7da9
This commit is contained in:
Pascal Massimino
2016-10-19 09:12:13 +02:00
parent 0104d730bf
commit 2f51b614b0
3 changed files with 92 additions and 92 deletions
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21
src/webp/encode.h
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@ -20,7 +20,7 @@
extern "C" {
#endif
#define WEBP_ENCODER_ABI_VERSION 0x0209 // MAJOR(8b) + MINOR(8b)
#define WEBP_ENCODER_ABI_VERSION 0x020b // MAJOR(8b) + MINOR(8b)
// Note: forward declaring enumerations is not allowed in (strict) C and C++,
// the types are left here for reference.
@ -388,9 +388,24 @@ WEBP_EXTERN(void) WebPPictureFree(WebPPicture* picture);
// Returns false in case of memory allocation error.
WEBP_EXTERN(int) WebPPictureCopy(const WebPPicture* src, WebPPicture* dst);
// Compute the single distortion for packed planes of samples.
// 'src' will be compared to 'ref', and the raw distortion stored into
// '*distortion'. The refined metric (log(MSE), log(1 - ssim),...' will be
// stored in '*result'.
// 'x_step' is the horizontal stride (in bytes) between samples.
// 'src/ref_stride' is the byte distance between rows.
// Returns false in case of error (bad parameter, memory allocation error, ...).
WEBP_EXTERN(int) WebPPlaneDistortion(const uint8_t* src, size_t src_stride,
const uint8_t* ref, size_t ref_stride,
int width, int height,
size_t x_step,
int type, // 0 = PSNR, 1 = SSIM, 2 = LSIM
float* distortion, float* result);
// Compute PSNR, SSIM or LSIM distortion metric between two pictures. Results
// are in dB, stored in result[] in the Y/U/V/Alpha/All or B/G/R/A/All order.
// Returns false in case of error (src and ref don't have same dimension, ...)
// are in dB, stored in result[] in the B/G/R/A/All order. The distortion is
// always performed using ARGB samples. Hence if the input is YUV(A), the
// picture will be internally converted to ARGB (just for the measurement).
// Warning: this function is rather CPU-intensive.
WEBP_EXTERN(int) WebPPictureDistortion(
const WebPPicture* src, const WebPPicture* ref,