raster pushed a commit to branch master. http://git.enlightenment.org/core/efl.git/commit/?id=256761bf2f92d74639c665ed99e0b64c64caf8a5
commit 256761bf2f92d74639c665ed99e0b64c64caf8a5 Author: kabeer khan <kabeer.k...@samsung.com> Date: Wed Dec 17 16:40:59 2014 +0900 evas/tgv: Added DSSIM metric in evas_image_save_tgv Summary: Resolved TODO to add DSSIM metric in DEBUG_STATS Signed-off-by: kabeer khan <kabeer.k...@samsung.com> Reviewers: cedric Subscribers: devilhorns, cedric Differential Revision: https://phab.enlightenment.org/D1773 --- src/modules/evas/savers/tgv/evas_image_save_tgv.c | 25 +++++++++++++++++++---- 1 file changed, 21 insertions(+), 4 deletions(-) diff --git a/src/modules/evas/savers/tgv/evas_image_save_tgv.c b/src/modules/evas/savers/tgv/evas_image_save_tgv.c index 306a628..c730b24 100644 --- a/src/modules/evas/savers/tgv/evas_image_save_tgv.c +++ b/src/modules/evas/savers/tgv/evas_image_save_tgv.c @@ -193,7 +193,8 @@ evas_image_save_file_tgv(RGBA_Image *im, #ifdef DEBUG_STATS struct timespec ts1, ts2; - long long tsdiff, mse = 0, mse_div = 0, mse_alpha = 0; + long long tsdiff, mse = 0, mse_div = 0, mse_alpha = 0, pixels_count = 0; + double mean_x = 0, mean_y = 0, var_x = 0, var_y = 0, cov_xy = 0; clock_gettime(CLOCK_MONOTONIC, &ts1); #endif @@ -464,6 +465,17 @@ evas_image_save_file_tgv(RGBA_Image *im, const int b = (B_VAL(&(todo[k])) - B_VAL(&(done[k]))); const int a = (A_VAL(&(todo[k])) - A_VAL(&(done[k]))); mse += r*r + g*g + b*b; + + /*refer http://planetmath.org/onepassalgorithmtocomputesamplevariance*/ + const double delta_x = (double)todo[k] - mean_x; + const double delta_y = (double)done[k] - mean_y; + mean_x = mean_x + (double)(delta_x / (pixels_count + 1)); + mean_y = mean_y + (double)(delta_y / (pixels_count + 1)); + var_x = var_x + ((double)(todo[k] - mean_x) * delta_x); + var_y = var_y + ((double)(done[k] - mean_y) * delta_y); + cov_xy = cov_xy + ((double)(todo[k] - mean_x) * (double)(done[k] - mean_y)); + pixels_count++; + if (alpha) mse_alpha += a*a; mse_div++; } @@ -509,7 +521,12 @@ evas_image_save_file_tgv(RGBA_Image *im, #ifdef DEBUG_STATS if (mse_div && mse) { - // TODO: Add DSSIM too + /* Calculating dssim http://en.wikipedia.org/wiki/Structural_similarity */ + double c1 = 0.01 * 255.0; + double c2 = 0.03 * 255.0; + double temp = (mean_x * mean_x + mean_y * mean_y + c1) * (var_x * var_x + var_y * var_y + c2); + double ssim = (2 * mean_x * mean_y + c1) * ( 2 * cov_xy + c2) / temp; + double dssim = (1 - ssim) / 2.0; double dmse = (double) mse / (double) (mse_div * 3.0); double psnr = 20 * log10(255.0) - 10 * log10(dmse); double dmse_alpha = (double) mse_alpha / (double) mse_div; @@ -518,8 +535,8 @@ evas_image_save_file_tgv(RGBA_Image *im, tsdiff = ((ts2.tv_sec - ts1.tv_sec) * 1000LL) + ((ts2.tv_nsec - ts1.tv_nsec) / 1000000LL); if (!alpha) { - INF("ETC%d encoding stats: %dx%d, Time: %lldms, RGB PSNR: %.02fdB", - alpha ? 2 : 1, image_stride, image_height, tsdiff, psnr); + INF("ETC%d encoding stats: %dx%d, Time: %lldms, RGB PSNR: %.02fdB DSSIM: %.02f", + alpha ? 2 : 1, image_stride, image_height, tsdiff, psnr, dssim); } else { --