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compare: special case empty regions with 1 SSIM to avoid dividing by 0

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Coverity 1139689, 1139688
This commit is contained in:
Vincent Penquerc'h 2014-04-09 15:18:22 +01:00
parent 93b1504945
commit 75c09f8d03
1 changed files with 8 additions and 0 deletions
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8
gst/debugutils/gstcompare.c
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@ -363,6 +363,10 @@ gst_compare_ssim_window (GstCompare * comp, guint8 * data1, guint8 * data2,
const gdouble c1 = (k1 * L) * (k1 * L);
const gdouble c2 = (k2 * L) * (k2 * L);
/* For empty images, return maximum similarity */
if (height <= 0 || width <= 0)
return 1.0;
/* plain and simple; no fancy optimizations */
for (i = 0; i < height; i++) {
for (j = 0; j < width; j++) {
@ -414,6 +418,10 @@ gst_compare_ssim_component (GstCompare * comp, guint8 * data1, guint8 * data2,
}
}
/* For empty images, return maximum similarity */
if (count == 0)
return 1.0;
return (ssim_sum / count);
}