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Merge pull request #1 from radarhere/image-entropy-method

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Removed log2
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Alexander Böhn 2019-01-02 19:38:49 -05:00 committed by GitHub
commit 6cc7a99ac0
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1 changed files with 4 additions and 1 deletions
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src/_imaging.c
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@ -85,6 +85,9 @@
#include "py3.h" #include "py3.h"
#define _USE_MATH_DEFINES
#include <math.h>
/* Configuration stuff. Feel free to undef things you don't need. */ /* Configuration stuff. Feel free to undef things you don't need. */
#define WITH_IMAGECHOPS /* ImageChops support */ #define WITH_IMAGECHOPS /* ImageChops support */
#define WITH_IMAGEDRAW /* ImageDraw support */ #define WITH_IMAGEDRAW /* ImageDraw support */
@ -1274,7 +1277,7 @@ _entropy(ImagingObject* self, PyObject* args)
fentropy = 0.0; fentropy = 0.0;
for (idx = 0; idx < length; idx++) { for (idx = 0; idx < length; idx++) {
p = (double)h->histogram[idx] / fsum; p = (double)h->histogram[idx] / fsum;
fentropy += p != 0.0 ? (p * log2(p)) : 0.0; fentropy += p != 0.0 ? (p * log(p) * M_LOG2E) : 0.0;
} }
/* Finally, allocate a PyObject* for return */ /* Finally, allocate a PyObject* for return */