此源码有个阈值可以自己调节,精确度等自测 <?php /*$Colorimg = new Colorimg(); $image=$Colorimg->IMGaction("G:/www/20161220/demo/5.jpg",1,1,50); //告诉浏览器以图片形式解析 header('content-type:image/jpeg'); imagejpeg($image, "G:/www/20161220/demo/3.jpg"); */ class Colorimg { public $image;//图片 private $cs;//比对阈值 public function IMGaction($imgurl,$if_url=1,$if_deflate=0,$cs='50') { if($if_url==1) { $image = $this->ImgcolorCRRATE($imgurl); }else{ $image = $imgurl; } if($if_deflate==1) { $image = $this->ImgDEFLATE($image); } //平均值 $sample = $this->ColorGETMEANrgb($image); $image=$this->ImgsetPIXEL($image,$sample,$cs); return $image; } /** * 打开一张图片 */ public function ImgcolorCRRATE($image) { list($width, $height) = getimagesize($image);//获取图片信息 $img_info = getimagesize($image); switch ($img_info[2]) { case 1: $img = imagecreatefromgif($image); break; case 2: $img = imagecreatefromjpeg($image); break; case 3: $img = imagecreatefrompng($image); break; } return $img; } /** * $rate为图片长宽最大值 */ public function ImgDEFLATE($image, $rate = '800') { $w = imagesx($image); $h = imagesy($image); //指定缩放出来的最大的宽度(也有可能是高度) $max = $rate; //根据最大值为300,算出另一个边的长度,得到缩放后的图片宽度和高度 if ($w > $h) { $w = $max; $h = $h * ($max / imagesx($image)); } else { $h = $max; $w = $w * ($max / imagesy($image)); } //声明一个$w宽,$h高的真彩图片资源 $i = imagecreatetruecolor($w, $h); //关键函数,参数(目标资源,源,目标资源的开始坐标x,y, 源资源的开始坐标x,y,目标资源的宽高w,h,源资源的宽高w,h) imagecopyresampled($i, $image, 0, 0, 0, 0, $w, $h, imagesx($image), imagesy($image)); return $i; } /** * 传入多维数组n个点计算平均值 *$rgbarrays=array( * $rgb1=array( * 'r'=>255, * 'g'=>255, * 'b'=>255 * ) * ) */ public function ColorRECKmean($rgbarrays) { //获取总共几个点 $sum = count($rgbarrays); $mean1['r'] = ''; $mean1['g'] = ''; $mean1['b'] = ''; foreach ($rgbarrays as $rbg) { $mean1['r'] += $rbg['r']; $mean1['g'] += $rbg['g']; $mean1['b'] += $rbg['b']; } $mean['r'] = intval($mean1['r'] / $sum); $mean['g'] = intval($mean1['g'] / $sum); $mean['b'] = intval($mean1['b'] / $sum); return $mean; } /** * 取四个点,返回平均点的rgb数组 */ public function ColorGETMEANrgb($image) { $rgb1 = imagecolorat($image, 0, 0); $rgb2 = imagecolorat($image, 0, imagesy($image) - 1); $rgb3 = imagecolorat($image, imagesx($image) - 1, 0); $rgb4 = imagecolorat($image, imagesx($image) - 1, imagesy($image) - 1); //平均值 $sample = $this->ColorRECKmean(array($this->ColorRGBresolved($rgb1)), $this->ColorRGBresolved($rgb2), $this->ColorRGBresolved($rgb3), $this->ColorRGBresolved($rgb4)); return $sample; } public function ImgsetPIXEL($image,$sample,$cs){ //如果相似就加一个白色的点 for ($x = 0; $x < imagesx($image); $x++) { for ($y = 0; $y < imagesy($image); $y++) { $rgb = imagecolorat($image, $x, $y); $than = $this->ColorTHANrgb($this->ColorRGBComp($this->ColorRGBresolved($rgb), $sample),$cs); if ($than) { $color = imagecolorallocate($image, 255, 255, 255); imagesetpixel($image, $x, $y, $color); } } } return $image; } /** * 比对颜色相似度 * $rgb1和$rgb2必须数组$rgb['r'].... */ public function ColorRGBComp($rgb1, $rgb2) { $tbsr = abs($rgb1['r'] - $rgb2['r']); $tbsg = abs($rgb1['g'] - $rgb2['g']); $tbsb = abs($rgb1['b'] - $rgb2['b']); $cv = sqrt(pow($tbsr, 2) + pow($tbsg, 2) + pow($tbsb, 2)); return $cv; } /** *把rgb颜色分解成数组 * */ function ColorRGBresolved($rgb) { $img['r'] = intval(($rgb >> 16) & 0xFF); $img['g'] = intval(($rgb >> 8) & 0xFF); $img['b'] = intval(($rgb) & 0xFF); return $img; } /** * 对比像素是否相似,相似返回true */ public function ColorTHANrgb($cv, $cs) { if ($cv <=$cs) { return true; } else { return false; } } }
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