travail/php-Image-PerceptualHash
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travail 2015-01-30 00:44:12 +09:00
parent 9a552b53c4
commit e05ec20e06
1 changed files with 5 additions and 5 deletions
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10
lib/PerceptualHash/Algorithm/AverageHash.php
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@ -20,24 +20,24 @@ class AverageHash implements Algorithm
$resized, $resource, 0, 0, 0, 0, $resized, $resource, 0, 0, 0, 0,
static::SIZE, static::SIZE, imagesx($resource), imagesy($resource)); static::SIZE, static::SIZE, imagesx($resource), imagesy($resource));
// Create an array of gray-scale pixel value // Create an array of gray-scaled pixel values.
$pixels = array(); $pixels = array();
for ($y = 0; $y < static::SIZE; $y++) { for ($y = 0; $y < static::SIZE; $y++) {
for ($x = 0; $x < static::SIZE; $x++) { for ($x = 0; $x < static::SIZE; $x++) {
$rgb = imagecolorsforindex($resized, imagecolorat($resized, $x, $y)); $rgb = imagecolorsforindex($resized, imagecolorat($resized, $x, $y));
$pixels[] = floor(($rgb['red'] + $rgb['green'] + $rgb['blue']) / 3); $pixels[] = ($rgb['red'] + $rgb['green'] + $rgb['blue']) / 3;
} }
} }
imagedestroy($resized); imagedestroy($resized);
// Calculate the average pixel value // Calculate a mean of gray-scaled pixel value.
$average = floor(array_sum($pixels) / count($pixels)); $mean = array_sum($pixels) / count($pixels);
$bin = ''; $bin = '';
$one = 1; $one = 1;
foreach ($pixels as $pixel) { foreach ($pixels as $pixel) {
$bin .= $pixel > $average ? 1 : 0; $bin .= $pixel > $mean ? 1 : 0;
$one = $one << 1; $one = $one << 1;
} }