PHP 图片转字符画 灰度 代码画

最近在看 字符画 很流行, 就是一种将RGB 信息 转坏为灰度 按指定的比例显示不同的字符
效果
讲一下大致思虑

1. 获取图像RBG
2. 将图片灰度(平均算法) /18
3. 255/18 = 16
4. 创建一个数组 [“M”,“N”,“H”,“Q”,"$",“O”,“C”,"?",“7”,">","!",":","–",";","."];
5. 将 数据循环出来 imagettftext($im,7,0,$keys+$yy,$key+ $xx,$RGB,“ztc.ttf”, $ico[$values]);

有2 种方案
第一种是 将图片扩大5倍 得到一个比自己大5 倍的图片
因为每个像素点是1px * 1px 一个字符是5px 所有 扩大5 倍
第二种 是 池化, 取最大数据进行 最池化 步频为2 字符串偏移的话用0 代替
第一种方案

","!",":","–",";","."];
    $erzhiArray = array();
 

// echo json_encode($NN_RBG);die();
$im = imagecreatetruecolor($imagesize[0]*5,$imagesize[1]*5); //生成真彩图片
$black = imagecolorallocate($im,220,230,250);//设置颜色

$init_x = 35;
$init_y = 70;
$num = 1;
$R = imagecolorallocate($im,0,0,0);//设置颜色
 
imagefill($im,10,1,$black) ;  //填充  // 从左上角开始填充灰色//背景
$RGB  = imagecolorallocate($im,0,0,0);//设置颜色

 $xx = 0;
 $yy = 0;
 foreach ($grayArray as $key => $value) {
 	 $xx = $xx+6;
 	  foreach ($value as $keys => $values) {
 	  	 $yy =  $yy+6;
          // $RGB  = imagecolorallocate($im,$RGBS[$key][$keys]['red'],$RGBS[$key][$keys]['green'],$RGBS[$key][$keys]['blue']);//设置颜色
 	  	    imagettftext($im,7,0,$keys+$yy,$key+ $xx,$RGB,"ztc.ttf", $ico[$values]); //字体设置部分li
 	  }
 	  $yy = 0;
 }
  
  header("Content-type:image/png");//png格式
  imagepng($im);//输出
  
  imagedestroy($im);//释放内存


 ?>

放大后
因为是 *5 所以回比原图像大5 倍
第二种 我封装了个类 里面包括 卷积 神经网络 二值化 卷积核 RGBA 和一些平均算法

self::$imageinfo,'size'=>self::$imagesize);
 	}
 	public function Average($imageinfo){//平均值
        foreach ($imageinfo as $key => $value) {
        	foreach ($value as $keys => $values) {
        		 // $values['red'];
        	}
        }
 	}
 	public function A($imageinfo,$imagesize=array(),$type=false,$ox=false,$type_xo=array(0,1)){//灰度
 		$temp =array();
 		$arr = array();
 		$num = 0;
 		$n_x = 0;
 		$n_num = 0;
        if ($type) {
        	for($h=0; $h < $imagesize['1'] ; $h++) { 
				for ($w=0; $w < $imagesize['0'] ; $w++) { 
					self::$temp  =  imagecolorat($imageinfo,$w,$h);//获得某像素的颜色索引值
					$arr = imagecolorsforindex($imageinfo,self::$temp); 
					$num = ($arr['red']+$arr['green']+$arr['blue'])/3;
					if ($ox) {
						if ($num>=127) {
							$temp[$h][$w]= array('red'=>$type_xo[0],'green'=>$type_xo[0],'blue'=>$type_xo[0]);
						}else{
							$temp[$h][$w]= array('red'=>$type_xo[1],'green'=>$type_xo[1],'blue'=>$type_xo[1]);
						}
					}else{
						$temp[$h][$w]= array('red'=>$num,'green'=>$num,'blue'=>$num);
					}
				}
		    }
        }else{
        	$temp_arr = array();
        	foreach ($imageinfo as $key => $value) {
				foreach ($value as $keys => $values) { 
					$num = ($values['red']+$values['green']+$values['blue'])/3;
					// $num = $values['red']*0.3+$values['green']*0.59+$values['blue']*0.11;
					$temp_arr[$key][$keys] = $num;
					$n_num+=$num;
					$n_x++;
				}
			}
			$n_num = $n_num/$n_x;
            self::$Average = $n_num ; 
			foreach ($imageinfo as $key => $value) {
				foreach ($value as $keys => $values) { 
					// $num = ($values['red']+$values['green']+$values['blue'])/3;
					$num = $temp_arr[$key][$keys];
					// $num = $values['red']*0.3+$values['green']*0.59+$values['blue']*0.11;
					// $n_num+=$num;
					
					if ($ox) {
						if ($num>=$n_num ) {
							$temp[$key][$keys]= array('red'=>$type_xo[0],'green'=>$type_xo[0],'blue'=>$type_xo[0]);
						}else{
							$temp[$key][$keys]= array('red'=>$type_xo[1],'green'=>$type_xo[1],'blue'=>$type_xo[1]);
						}
					}else{
						$temp[$key][$keys]= array('red'=>$num,'green'=>$num,'blue'=>$num);
					}
				}
			}
		
        } 
        return $temp;
 	}
    private	function __construct() {
    	// $file=''
    	// if (!file_exists($file)) {
    	// 	echo   'error file?';
    	// 	return 'error file?';
    	// }
		// self::$imagesize  = getimagesize($file);//获取文件大小
		// self::$imageinfo  = imagecreatefromjpeg($file);//获取图片
		self::$kernel =  array([-1,  0,  1, -2, 0,  2, -1,  0,  1],//0.Sobel算子 纵向边缘检测
		                       [-1, -1, -1, -1, 9, -1, -1, -1, -1],//1.强化锐化滤波器Sharpness Filter
		                       [-1, -1, -1,  0, 0,  0,  1,  1,  1],//2.// Prewitt算子 横向边缘检测
		                       [-1,  0,  1, -1, 0,  1, -1,  0,  1],//3.// Prewitt算子 纵向边缘检测
		                       [-2, -2,  0, -2, 6,  0,  0,  0,  0],//4.浮雕
		                       [ 1, -1,  0,  0, 1,  1,  1, -1,  1],//5.多层卷积卷积核
		                       [-1,  1, -1, -1, 1,  0,  0, -1, -1],//6.多层卷积卷积核
		                       [ 1, -1,  1,  1,-1,  0,  1,  1, -1],//7.多层卷积卷积核
		                       [ 1,  1,  0, -1, 0,  1,  1, -1, -1],//8.多层卷积卷积核
		                       [ 1,  1,  0,  0,-1,  0,  1, -1,  0],//9.多层卷积卷积核
		                       [ 0,  0, -1, -1,-1,  0,  0, -1,  0],//10.多层卷积卷积核
		                       [ 0,  0,  0,  0, 7,  0,  0,  0,  0],//11.图暗部细节增强
		                       [ 4,  0,  0,  0, 0,  0,  0,  0, -4],//12.边缘强化
		                       [ 0, -1,  0, -1, 2, -1,  0, -1,  0],//13.锐化滤波器S
		                       [ 1,  2.18,  1,  2.18, 4.77,  2.18,  1,  2.18, 1],//13.高斯滤波 /16
		                       [ 1,  1,  1,  1, 1,
		                         1,  1,  1,  1, 1,
		                         1,  1,  2,  1, 1,
		                         1,  1,  1,  1, 1,
		                         1,  1,  1,  1, 1],//12.高斯模糊
							   [1,0,0,0,0,0,0,0,0,
								0,1,0,0,0,0,0,0,0,
								0,0,1,0,0,0,0,0,0,
								0,0,0,1,0,0,0,0,0,
								0,0,0,0,1,0,0,0,0,
								0,0,0,0,0,1,0,0,0,
								0,0,0,0,0,0,1,0,0,
								0,0,0,0,0,0,0,1,0,
								0,0,0,0,0,0,0,0,1,] //4.卷积核 9X9 运动模糊

		                       );
		  // $this->RGBA();
 	}
 	private function __clone() {//防止克隆
           
    }
    static function Obj($File){
        if(!(self::$instance instanceof self)){
            self::$instance = new self($File);
        }
            return self::$instance;
    }
    public function Fast_con($RGBA,$kernel,$type=true,$con=1,$size=array()){//快速卷积
	    $sqrt = sqrt(count($kernel));
	    $love =  floor($sqrt/2);
	    $temps =  array();
	    if ($size) {
	    	$imagesize = $size; 
	    }else{
	    	$imagesize = self::$imagesize;
	    }
	    if (!$type) {
		    foreach ($RGBA as $X => $value) {
		    	foreach ($value as $Y => $values) {
				    if ($X<$love || $X>($imagesize['1']-$love-1)) {//边界处理 top
				        if ($Y<$love || $Y>($imagesize['0']-$love-1)) { //卷积核左边处理
				            $temps[$X][$Y]=$RGBA[$X][$Y];
				        }else{
				            $temps[$X][$Y]=$RGBA[$X][$Y]; 
				        }
				    }else{
				        if ($Y<$love || $Y>($imagesize['0']-$love-1)) { //卷积核左边处理
				            $temps[$X][$Y]=$RGBA[$X][$Y];
				        }else{
				            $temp  = 0;
						    $num   = 0;
						    $tempa =array();
						    for ($i= $X-$love; $i <($X-$love)+$sqrt ; $i++) { 
						    	for ($s= $Y-$love; $s <($Y-$love)+$sqrt  ; $s++) { 
						    		$temp+= $RGBA[$i][$s]['red']*$kernel[$num]; 
						    		++$num;
						    	}
						    }
						    $temp = abs($temp)/$con;
						    if ($temp>=255) {
						    	$temp = 255;
						    }
						    $temps[$X][$Y]= array('blue'=>$temp,'green'=>$temp,'red'=>$temp);
				        }
				    }
		    	}
		    }
	    }else {
		    foreach ($RGBA as $X => $value) {
		    	foreach ($value as $Y => $values) {
				    if ($X<$love || $X>($imagesize['1']-$love-1)) {//边界处理 top
				        if ($Y<$love || $Y>($imagesize['0']-$love-1)) { //卷积核左边处理
				            $temps[$X][$Y]=$RGBA[$X][$Y];
				        }else{
				            $temps[$X][$Y]=$RGBA[$X][$Y]; 
				        }
				    }else{
				        if ($Y<$love || $Y>($imagesize['0']-$love-1)) { //卷积核左边处理
				            $temps[$X][$Y]=$RGBA[$X][$Y];
				        }else{
				            $temp  = 0;
				            $temp1 = 0;
				            $temp2 = 0;
						    $num   = 0;
						    $tempa =array();
						    for ($i= $X-$love; $i <($X-$love)+$sqrt ; $i++) { 
						    	for ($s= $Y-$love; $s <($Y-$love)+$sqrt  ; $s++) { 
						    		$temp+= $RGBA[$i][$s]['red']*$kernel[$num]; 
						    		$temp1+= $RGBA[$i][$s]['green']*$kernel[$num]; 
						    		$temp2+= $RGBA[$i][$s]['blue']*$kernel[$num]; 
						    		++$num;
						    	}
						    }
						    $temp = abs($temp)/$con;
						    if ($temp>=255) {
						    	$temp = 255;
						    }
						    $tempa['red'] = $temp;
						    $temp = abs($temp1)/$con;
						    if ($temp>=255) {
						    	$temp = 255;
						    }
						    $tempa['green'] = $temp;
						    $temp = abs($temp2)/$con;
						    if ($temp>=255) {
						    	$temp = 255;
						    }
						    $tempa['blue'] = $temp;
						    $temps[$X][$Y]=$tempa;
				        }
				    }
		    	}
		    }
	    }
	    return  $temps;
    }
    public function  cons($RGBA,$kernel,$size=array()){//多层卷积
        $sqrt = sqrt(count($kernel['red']));
	    $love =  floor($sqrt/2);
	    $temps =  array();
	    if ($size) {
	    	$imagesize = $size; 
	    }else{
	    	$imagesize = self::$imagesize;
	    }
	    foreach ($RGBA as $X => $value) {
		    	foreach ($value as $Y => $values) {
				    if ($X<$love || $X>($imagesize['1']-$love-1)) {//边界处理 top
				        if ($Y<$love || $Y>($imagesize['0']-$love-1)) { //卷积核左边处理
				            $temps[$X][$Y]=$RGBA[$X][$Y];
				        }else{
				            $temps[$X][$Y]=$RGBA[$X][$Y]; 
				        }
				    }else{
				        if ($Y<$love || $Y>($imagesize['0']-$love-1)) { //卷积核左边处理
				            $temps[$X][$Y]=$RGBA[$X][$Y];
				        }else{
				            $temp  = 0;
				            $temp1 = 0;
				            $temp2 = 0;
						    $num   = 0;
						    $tempa =array();
						    for ($i= $X-$love; $i <($X-$love)+$sqrt ; $i++) { 
						    	for ($s= $Y-$love; $s <($Y-$love)+$sqrt  ; $s++) { 
						    		$temp+= $RGBA[$i][$s]['red']*$kernel['red'][$num]; 
						    		$temp1+= $RGBA[$i][$s]['green']*$kernel['green'][$num]; 
						    		$temp2+= $RGBA[$i][$s]['blue']*$kernel['blue'][$num]; 
						    		++$num;
						    	}
						    }
						    $temp = abs($temp);
						    if ($temp>=255) {
						    	$temp = 255;
						    }
						    $tempa['red'] = $temp;
						    $temp = abs($temp1);
						    if ($temp>=255) {
						    	$temp = 255;
						    }
						    $tempa['green'] = $temp;
						    $temp = abs($temp2);
						    if ($temp>=255) {
						    	$temp = 255;
						    }
						    $tempa['blue'] = $temp;
						    $temps[$X][$Y]=$tempa;
				        }
				    }
		    	}
		}
		return  $temps;
    }
    public function Ikeka($RGB,$size=1,$imagesize,$type=true){//池化
    	$temps =  array();
    	$x = 0;
    	$y = 0;
    	$max = 0;
    	$max1 = 0;
    	$max2 = 0;
    	$ys = 0;
        for ($i=0; $i < $imagesize[1] ; $i++) { 
        	// $x++;
			if ($i<=$imagesize[1]-$size-1) {
				for ($s=0; $s < $imagesize[0]-$size; $s++) { 
					// echo "
";
					if ($s<=$imagesize[0]-$size-1) {
						for ($ii=$i; $ii <= $i+$size ; $ii++) { 
							for ($is=$s; $is <= $s+$size ; $is++) { 
								if ($max < $RGB[$ii][$is]['red']) {
								    $max = $RGB[$ii][$is]['red'];
								}
									
								if ($max1 < $RGB[$ii][$is]['green']) {
									$max1 = $RGB[$ii][$is]['green'];
								}
								
								if ($max2 < $RGB[$ii][$is]['blue']) {
									$max2 = $RGB[$ii][$is]['blue'];
								}
							}
						}
						if ($type) {
							$temps['rgb'][$x][$y]=array('red'=>$max,'green'=>$max1,'blue'=>$max2);
						}else{
							$temps['rgb'][$i][$s]=array('red'=>$max,'green'=>$max1,'blue'=>$max2);
						}
						$max = 0;
						$max1 = 0;
						$max2 = 0;
						$s+=$size;
						$y++;
					}
			    }
			    $x++;
			    $ys=$y;
			    $y=0;
			$i+=$size;
			} 
        }
    	$temps['size'] = array($ys,$x);
        return $temps;
    }
    public function OX_01($RGB,$imagesize,$size=2,$nums=1.8){//深度二值化自适应
        $temps =  array();
    	$x = 0;
    	$y = 0;
    	$max = 0;
    	$min = 0;
    	$num = 0;
    	$ys = 0;
        for ($i=0; $i < $imagesize[1] ; $i++) { 
        	// $x++;
			if ($i<=$imagesize[1]-$size-1) {
				for ($s=0; $s < $imagesize[0]-$size; $s++) { 
					// echo "
";
					if ($s<=$imagesize[0]-$size-1) {
						for ($ii=$i; $ii <= $i+$size ; $ii++) { 
							for ($is=$s; $is <= $s+$size ; $is++) { 
								$num  += $RGB[$ii][$is]['red'];
								if ($max < $RGB[$ii][$is]['red']) {
									$max = $RGB[$ii][$is]['red'];
								}
								if ($min > $RGB[$ii][$is]['red']) {
									$min = $RGB[$ii][$is]['red'];
								}
							}
						}
						$ys = (( $min+$max)/2)*$nums;			
						for ($ii=$i; $ii <= $i+$size ; $ii++) { 
							for ($is=$s; $is <= $s+$size ; $is++) { 
							    if ($RGB[$ii][$is]['red']<=$ys) {
							   	    $temps[$ii][$is]=array('red'=>0,'green'=>0,'blue'=>0);
							    }else{
							   	    $temps[$ii][$is]=array('red'=>255,'green'=>255,'blue'=>255);
							    }
								
							}
						}
						$max = 0;
						$min = 0;
						$num = 0;
						$s+=$size;
						$y++;
					}

			    }
			  
			    $x++;
			    $y=0;
			$i+=$size;
			} 
        }
        return $temps;
    }
    public function OX_02($RGB,$imagesize,$size=0){
        $temps =  array();
    	$x = 0;
    	$y = 0;
    	$max = 0;
    	$min = 255;
    	$num = 0;
    	$ys = 0;
        for ($i=0; $i < $imagesize[1] ; $i++) { 
        	// $x++;
			if ($i<=$imagesize[1]-$size-1) {
				for ($s=0; $s < $imagesize[0]-$size; $s++) { 
					// echo "
";
					if ($s<=$imagesize[0]-$size-1) {
						for ($ii=$i; $ii <= $i+$size ; $ii++) { 
							for ($is=$s; $is <= $s+$size ; $is++) { 
								$num  += $RGB[$ii][$is]['red'];
								if ($max < $RGB[$ii][$is]['red']) {
									$max = $RGB[$ii][$is]['red'];
								}
								if ($min > $RGB[$ii][$is]['red']) {
									$min = $RGB[$ii][$is]['red'];
								}
							}
						}
						// echo $min;die();
						$ys =   ($max)/2;
						for ($ii=$i; $ii <= $i+$size ; $ii++) { 
							for ($is=$s; $is <= $s+$size ; $is++) { 
							    if ($RGB[$ii][$is]['red']>=$ys+40  ) {
							   	    $temps[$ii][$is]=array('red'=>0,'green'=>0,'blue'=>0);
							    }else{
							   	    $temps[$ii][$is]=array('red'=>255,'green'=>255,'blue'=>255);
							    }
								
							}
						}
						$max = 0;
						$min = 255;
						$num = 0;
						$s+=$size;
						$y++;
					}

			    }
			  
			    $x++;
			    $y=0;
			$i+=$size;
			} 
        }
        return $temps;
    }
    public function OX_fd(){

    }

 } 
 
// $Obj = ImageFd::Obj("10.jpg");
// print_r($Obj::$kernel[0]);
// $Obj::RGBA(true);
 // $data = json_decode(file_get_contents("face"),true);
// $data =  $Obj->Fast_con($Obj::$RGBA,$Obj::$kernel[0],5,1,$data['size']);
 // print_r(count( $data));
// $data = $Obj->Ikeka($Obj::$RGBA,1,$Obj::$imagesize,false)['rgb'];
// $data =  $Obj->cons($data['rgb'],array('red'=>$Obj::$kernel[2],'green'=>$Obj::$kernel[0],'blue'=>$Obj::$kernel[3]),$data['size']);
 
// die();
// $data =  $Obj->cons($Obj::$RGBA,array('red'=>$Obj::$kernel[7],'green'=>$Obj::$kernel[7],'blue'=>$Obj::$kernel[7]));
// $data =  $Obj->cons($Obj::$RGBA,array('red'=>$Obj::$kernel[0],'green'=>$Obj::$kernel[2],'blue'=>$Obj::$kernel[3]));
// $data =  $Obj->Fast_con($data,$Obj::$kernel[11],true,3);
// $data =  $Obj->cons($data,array('red'=>$Obj::$kernel[0],'green'=>$Obj::$kernel[2],'blue'=>$Obj::$kernel[3]));
// print_r($Obj->RGBA(true));die();

 

// $data =  $Obj->Fast_con($Obj::$RGBA,$Obj::$kernel[12]);
 // $data = $Obj->OX_02($data,$Obj::$imagesize);

// $data =  $Obj->A($Obj::$RGBA,$Obj::$imagesize,false,true,array(255,0));
// $data =  $Obj->Fast_con($data,$Obj::$kernel[13],true,16);
// $data =  $Obj->Fast_con($data,$Obj::$kernel[0],false);
// $data =  $Obj->A($data);
 


//  $im = imagecreatetruecolor(800,800); //生成真彩图片
// $black = imagecolorallocate($im,220,230,250);//设置颜色
// imagefill($im,10,1,$black) ;
// foreach ($data as $key => $value) {
// 	foreach ($value as $keys => $values) {
// 		 $R = imagecolorallocate($im,$values['red'],$values['green'],$values['blue']);//设置颜色
//          imagesetpixel($im,$keys,$key, $R);//绘制图案
// 	}
// }
// foreach ($data as $key => $value) {
// 	foreach ($value as $keys => $values) {
// 		 $R = imagecolorallocate($im,$values['red'],$values['red'],$values['red']);//设置颜色
//          imagesetpixel($im,$keys+180,$key, $R);//绘制图案
// 	}
// }
// foreach ($data as $key => $value) {
// 	foreach ($value as $keys => $values) {
// 		 $R = imagecolorallocate($im,$values['green'],$values['green'],$values['green']);//设置颜色
//          imagesetpixel($im,$keys+360,$key, $R);//绘制图案
// 	}
// }
// foreach ($data as $key => $value) {
// 	foreach ($value as $keys => $values) {
// 		 $R = imagecolorallocate($im,$values['blue'],$values['blue'],$values['blue']);//设置颜色
//          imagesetpixel($im,$keys+540,$key, $R);//绘制图案
// 	}
// }
//    header("Content-type:image/png");//png格式
//   imagepng($im);//输出
  
//   imagedestroy($im);//释放内存

 ?>