Created
January 29, 2019 09:05
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Image JPG compare
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<?php | |
function compareImages($imagePathA, $imagePathB, $accuracy) | |
{ | |
// load base image | |
$bim = imagecreatefromjpeg($imagePathA); | |
// create comparison points | |
$bimX = imagesx($bim); | |
$bimY = imagesy($bim); | |
$pointsX = $accuracy * 5; | |
$pointsY = $accuracy * 5; | |
$sizeX = round($bimX / $pointsX); | |
$sizeY = round($bimY / $pointsY); | |
// load image into an object | |
$im = imagecreatefromjpeg($imagePathB); | |
// loop through each point and compare the color of that point | |
$y = 0; | |
$matchcount = 0; | |
$num = 0; | |
for ($i = 0; $i <= $pointsY; $i++) { | |
$x = 0; | |
for ($n = 0; $n <= $pointsX; $n++) { | |
$rgba = imagecolorat($bim, $x, $y); | |
$colorsa = imagecolorsforindex($bim, $rgba); | |
$rgbb = imagecolorat($im, $x, $y); | |
$colorsb = imagecolorsforindex($im, $rgbb); | |
if (colorComp($colorsa['red'], $colorsb['red']) && colorComp($colorsa['green'], $colorsb['green']) && colorComp($colorsa['blue'], $colorsb['blue'])) { | |
// point matches | |
$matchcount++; | |
} | |
$x+= $sizeX; | |
$num++; | |
} | |
$y+= $sizeY; | |
} | |
// take a rating of the similarity between the points, if over 90 percent they match. | |
$rating = $matchcount * (100 / $num); | |
return $rating; | |
} | |
function colorComp($color, $c) | |
{ | |
// test to see if the point matches - within boundaries | |
if ($color >= $c - 2 && $color <= $c + 2) { | |
return true; | |
} | |
else { | |
return false; | |
} | |
} | |
$imagePathA = 'https://www.w3.org/MarkUp/Test/xhtml-print/20050519/tests/jpeg420exif.jpg'; | |
$imagePathB = 'https://www.w3.org/MarkUp/Test/xhtml-print/20050519/tests/jpeg420exif.jpg'; | |
print_r(compareImages($imagePathA, $imagePathB, 100)); | |
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