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JavaScript实现的图像模糊算法代码分享_javascript技巧

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May 16, 2016 pm 04:51 PM
javascript

项目中需要用到HTML5模糊图像，以前用GDI，GDI 中都有现成的组件来实现，HTML5中如何实现？
1.createImageData()
2.getImageData()
3.putImageData()
以上3个函数即可实现，用法和奥义，自己百度吧,我就不重复叙述了，没多大的意义。

以下是实现模糊算法的JS，其实还有种2B级算法就是分布矩阵，这样效率提高很多倍，不过效果很差，羽化的效果不强。
实现代码：

复制代码 代码如下:

var mul_table = [
        512,512,456,512,328,456,335,512,405,328,271,456,388,335,292,512,
        454,405,364,328,298,271,496,456,420,388,360,335,312,292,273,512,
        482,454,428,405,383,364,345,328,312,298,284,271,259,496,475,456,
        437,420,404,388,374,360,347,335,323,312,302,292,282,273,265,512,
        497,482,468,454,441,428,417,405,394,383,373,364,354,345,337,328,
        320,312,305,298,291,284,278,271,265,259,507,496,485,475,465,456,
        446,437,428,420,412,404,396,388,381,374,367,360,354,347,341,335,
        329,323,318,312,307,302,297,292,287,282,278,273,269,265,261,512,
        505,497,489,482,475,468,461,454,447,441,435,428,422,417,411,405,
        399,394,389,383,378,373,368,364,359,354,350,345,341,337,332,328,
        324,320,316,312,309,305,301,298,294,291,287,284,281,278,274,271,
        268,265,262,259,257,507,501,496,491,485,480,475,470,465,460,456,
        451,446,442,437,433,428,424,420,416,412,408,404,400,396,392,388,
        385,381,377,374,370,367,363,360,357,354,350,347,344,341,338,335,
        332,329,326,323,320,318,315,312,310,307,304,302,299,297,294,292,
        289,287,285,282,280,278,275,273,271,269,267,265,263,261,259];

  
var shg_table = [
         9, 11, 12, 13, 13, 14, 14, 15, 15, 15, 15, 16, 16, 16, 16, 17,
        17, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18, 18, 18, 18, 18, 19,
        19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 20, 20, 20,
        20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 21,
        21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21,
        21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 22, 22, 22, 22, 22, 22,
        22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
        22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 23,
        23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23,
        23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23,
        23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23,
        23, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
        24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
        24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
        24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
        24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24 ];

function stackBlurImage( imageID, canvasID, radius, blurAlphaChannel )
{

     var img = document.getElementById( imageID );
    var w = img.naturalWidth;
    var h = img.naturalHeight;

    var canvas = document.getElementById( canvasID );

    canvas.style.width  = w + "px";
    canvas.style.height = h + "px";
    canvas.width = w;
    canvas.height = h;

    var context = canvas.getContext("2d");
    context.clearRect( 0, 0, w, h );
    context.drawImage( img, 0, 0 );

    if ( isNaN(radius) || radius
    if ( blurAlphaChannel )
        stackBlurCanvasRGBA( canvasID, 0, 0, w, h, radius );
    else
        stackBlurCanvasRGB( canvasID, 0, 0, w, h, radius );
}


函数 stackBlurCanvasRGBA( id, top_x, top_y, width, height, radius )
{
    if ( isNaN(radius) || radius     radius |= 0 ;

    var canvas = document.getElementById( id );
    var context = canvas.getContext("2d");
    var imageData;

    尝试 {
      尝试{
        imageData = context.getImageData( top_x, top_y, width, height );
      } catch(e) {

    
        尝试 {
            netscape.security.PrivilegeManager.enablePrivilege( "UniversalBrowserRead");
            imageData = context.getImageData( top_x, top_y, width, height );
        } catch(e) {
            Alert("无法访问本地图像");
            throw new Error("无法访问本地图像数据：" e);
            return;
        }
      }
    } catch(e) {
     alert("无法访问图像");
      throw new Error("无法访问图像数据：" e);
    }

    var Pixels = imageData.data;

    var x, y, i, p, yp, yi, yw, r_sum, g_sum, b_sum, a_sum,
    r_out_sum, g_out_sum, b_out_sum, a_out_sum,
    r_in_sum, g_in_sum, b_in_sum, a_in_sum,
    pr, pg, pb, pa, rbs;

    var div = 半径 radius 1;
    var w4 = 宽度     var widthMinus1  = 宽度 - 1;
    var heightMinus1 = 高度 - 1;
    var radiusPlus1  = 半径 1;
    var sumFactor = radiusPlus1 * ( radiusPlus1 1 ) / 2;

    var stackStart = new BlurStack();
    var stack = stackStart;
    for ( i = 1; i     {
        stack = stack.next = new BlurStack( );
        if ( i == radiusPlus1 ) var stackEnd = stack;
    }
    stack.next = stackStart;
    var stackIn = null;
    var stackOut = null;

    yw = yi = 0;

    var mul_sum = mul_table[半径];
    var shg_sum = shg_table[半径];

    for ( y = 0; y     {
        r_in_sum = g_in_sum = b_in_sum = a_in_sum = r_sum = g_sum = b_sum = a_sum = 0;

        r_out_sum = radiusPlus1 * ( pr = 像素[yi]);
       g_out_sum = radiusPlus1 * ( pg = 像素[yi 1] );
        b_out_sum = radiusPlus1 * ( pb = 像素[yi 2] );
        a_out_sum = radiusPlus1 * ( pa = 像素[yi 3] );

        r_sum = sumFactor * pr;
        g_sum = sumFactor * pg;
        b_sum = sumFactor * pb;
        a_sum = sumFactor * pa;

        stack = stackStart;

        for( i = 0;我        {
            stack.r = pr;
            stack.g = pg;
            stack.b = pb;
            stack.a = pa;
            堆栈 = stack.next ;
        }

        for( i = 1; i         {
            p = yi (( widthMinus1 r_sum = ( stack.r = ( pr = Pixels[p])) * ( rbs = radiusPlus1 - i );
            g_sum = ( stack.g = ( pg = Pixels[p 1])) * rbs;
            b_sum = ( stack.b = ( pb = Pixels[p 2])) * rbs;
            a_sum = ( stack.a = ( pa = Pixels[p 3])) * rbs;

r_in_sum = pr;
            g_in_sum = pg;
            b_in_sum = pb;
            a_in_sum = pa;

            stack = stack.next;
        }

       
stackIn = stackStart;
        stackOut = stackEnd;
        for ( x = 0; x         {
            像素[yi 3] = pa = (a_sum * mul_sum) >> ; shg_sum;
            if ( pa != 0 )
            {
                pa = 255 / pa;
               像素[yi]   = ((r_sum * mul_sum) & gt;> shg_sum) * pa;
                像素[yi 1] = ((g_sum * mul_sum) >> shg_sum) * pa;
                像素[yi 2] = ((b_sum * mul_sum) >> shg_sum) * pa;
            } else {
                像素[yi] = 像素[yi 1] = 像素[yi 2] = 0;
            }

            r_sum -= r_out_sum;
            g_sum -= g_out_sum;
            b_sum -= b_out_sum;
            a_sum -= a_out_sum;

            r_out_sum -= stackIn.r;
            g_out_sum -= stackIn.g;
            b_out_sum -= stackIn.b;
            a_out_sum -= stackIn.a;

            p =  ( yw + ( ( p = x + radius + 1 )
            r_in_sum += ( stackIn.r = pixels[p]);
            g_in_sum += ( stackIn.g = pixels[p+1]);
            b_in_sum += ( stackIn.b = pixels[p+2]);
            a_in_sum += ( stackIn.a = pixels[p+3]);

            r_sum += r_in_sum;
            g_sum += g_in_sum;
            b_sum += b_in_sum;
            a_sum += a_in_sum;

            stackIn = stackIn.next;

            r_out_sum += ( pr = stackOut.r );
            g_out_sum += ( pg = stackOut.g );
            b_out_sum += ( pb = stackOut.b );
            a_out_sum += ( pa = stackOut.a );

            r_in_sum -= pr;
            g_in_sum -= pg;
            b_in_sum -= pb;
            a_in_sum -= pa;

            stackOut = stackOut.next;

            yi += 4;
        }
        yw += width;
    }

   
    for ( x = 0; x     {
        g_in_sum = b_in_sum = a_in_sum = r_in_sum = g_sum = b_sum = a_sum = r_sum = 0;

yi = x         r_out_sum = radiusPlus1 * ( pr = 像素[yi]);
        g_out_sum = radiusPlus1 * ( pg = 像素[yi 1]);
        b_out_sum = radiusPlus1 * ( pb = 像素[yi 2] );
        a_out_sum = radiusPlus1 * ( pa = Pixels[yi 3]);

        r_sum = sumFactor * pr;
        g_sum = sumFactor * pg;
        b_sum = sumFactor * pb;
a_sum = sumfactor * pa;

stack = stack; stackstart;

for（i = 0; i = 0; i＆lt; radiusplus1; i）
{
{ stack.r = pr;
            stack.g = pg;
            stack.b = pb;
            stack.a = pa;
            stack = stack.next;
        }

        yp = 宽度；

        for( i = 1; i         {
            yi = ( yp x )
            r_sum = ( stack.r = ( pr = Pixels[yi])) * ( rbs = radiusPlus1 - i );
            g_sum = ( stack.g = ( pg = Pixels[yi 1 ) ])) * rbs;
            b_sum = ( stack.b = ( pb = Pixels[yi 2])) * rbs;
            a_sum = ( stack.a = ( pa = Pixels[yi 3])) * rbs;

            r_in_sum = pr;
            g_in_sum = pg;
            b_in_sum = pb;
            a_in_sum = pa;

            stack = stack.next;

            if( i             {
               yp = 宽度;
            }
        }

       yi = x;
        stackIn = stackStart;
        stackOut = stackEnd ;
        for ( y = 0; y         {
            p = yi             像素[p 3] = pa = (a_sum * mul_sum) >>> shg_sum;
            if ( pa > 0 )
            {
                pa = 255 / pa;
                像素[p]   = ((r_sum * mul_sum) & gt;> shg_sum ) * pa;
               像素[p 1] = ((g_sum * mul_sum) >> shg_sum ) * pa;
                像素[p 2] = ((b_sum * mul_sum) >> shg_sum ) * pa;
           } else {
                像素[p] = 像素[p 1] = 像素[p 2] = 0;
            }

            r_sum -= r_out_sum;
            g_sum -= g_out_sum;
            b_sum -= b_out_sum;
            a_sum -= a_out_sum;

            r_out_sum -= stackIn.r;
            g_out_sum -= stackIn.g;
            b_out_sum -= stackIn.b;
            a_out_sum -= stackIn.a;

            p = ( x + (( ( p = y + radiusPlus1)
            r_sum += ( r_in_sum += ( stackIn.r = pixels[p]));
            g_sum += ( g_in_sum += ( stackIn.g = pixels[p+1]));
            b_sum += ( b_in_sum += ( stackIn.b = pixels[p+2]));
            a_sum += ( a_in_sum += ( stackIn.a = pixels[p+3]));

            stackIn = stackIn.next;

            r_out_sum += ( pr = stackOut.r );
            g_out_sum += ( pg = stackOut.g );
            b_out_sum += ( pb = stackOut.b );
            a_out_sum += ( pa = stackOut.a );

            r_in_sum -= pr;
            g_in_sum -= pg;
            b_in_sum -= pb;
            a_in_sum -= pa;

            stackOut = stackOut.next;

            yi += width;
        }
    }

    context.putImageData( imageData, top_x, top_y );

}


function stackBlurCanvasRGB( id, top_x, top_y, width, height, radius )
{
    if ( isNaN(radius) || radius     radius |= 0 ;

    var canvas = document.getElementById( id );
    var context = canvas.getContext("2d");
    var imageData;

    尝试 {
      尝试{
        imageData = context.getImageData( top_x, top_y, width, height );
      } catch(e) {

 
        尝试 {
            netscape.security.PrivilegeManager.enablePrivilege( "UniversalBrowserRead");
            imageData = context.getImageData( top_x, top_y, width, height );
        } catch(e) {
            Alert("无法访问本地图像");
            throw new Error("无法访问本地图像数据：" e);
            return;
        }
      }
    } catch(e) {
     alert("无法访问图像");
      throw new Error("无法访问图像数据：" e);
    }

    var Pixels = imageData.data;

    var x, y, i, p, yp, yi, yw, r_sum, g_sum, b_sum,
    r_out_sum, g_out_sum, b_out_sum,
    r_in_sum, g_in_sum, b_in_sum,
    pr, pg, pb, rbs;

    var div = 半径 radius 1;
    var w4 = 宽度     var widthMinus1  = 宽度 - 1;
    var heightMinus1 = 高度 - 1;
    var radiusPlus1  = 半径 1;
    var sumFactor = radiusPlus1 * ( radiusPlus1 1 ) / 2;

    var stackStart = new BlurStack();
    var stack = stackStart;
    for ( i = 1; i     {
        stack = stack.next = new BlurStack( );
        if ( i == radiusPlus1 ) var stackEnd = stack;
    }
    stack.next = stackStart;
    var stackIn = null;
    var stackOut = null;

    yw = yi = 0;

    var mul_sum = mul_table[半径];
    var shg_sum = shg_table[半径];

    for ( y = 0; y     {
        r_in_sum = g_in_sum = b_in_sum = r_sum = g_sum = b_sum = 0;

        r_out_sum = radiusPlus1 * ( pr = 像素[yi] );
        g_out_sum = radiusPlus1 * （ pg = 像素[yi 1] );
        b_out_sum = radiusPlus1 * ( pb = 像素[yi 2] );

        r_sum = sumFactor * pr;
        g_sum = sumFactor * pg;
b_sum = sumFactor * pb;

        stack = stackStart;

        for( i = 0;我        {
            stack.r = pr;
            stack.g = pg;
            stack.b = pb;
            stack = stack.next;
        }

        for( i = 1; i         {
            p = yi + (( widthMinus1             r_sum += ( stack.r = ( pr = pixels[p])) * ( rbs = radiusPlus1 - i );
            g_sum += ( stack.g = ( pg = pixels[p+1])) * rbs;
            b_sum += ( stack.b = ( pb = pixels[p+2])) * rbs;

            r_in_sum += pr;
            g_in_sum += pg;
            b_in_sum += pb;

            stack = stack.next;
        }

       
        stackIn = stackStart;
        stackOut = stackEnd;
        for ( x = 0; x         {
            pixels[yi]   = (r_sum * mul_sum) >> shg_sum;
            pixels[yi+1] = (g_sum * mul_sum) >> shg_sum;
            pixels[yi+2] = (b_sum * mul_sum) >> shg_sum;

            r_sum -= r_out_sum;
            g_sum -= g_out_sum;
            b_sum -= b_out_sum;

            r_out_sum -= stackIn.r;
            g_out_sum -= stackIn.g;
            b_out_sum -= stackIn.b;

            p =  ( yw + ( ( p = x + radius + 1 )
            r_in_sum += ( stackIn.r = pixels[p]);
            g_in_sum += ( stackIn.g = pixels[p+1]);
            b_in_sum += ( stackIn.b = pixels[p+2]);

            r_sum += r_in_sum;
            g_sum += g_in_sum;
            b_sum += b_in_sum;

            stackIn = stackIn.next;

            r_out_sum += ( pr = stackOut.r );
            g_out_sum += ( pg = stackOut.g );
            b_out_sum += ( pb = stackOut.b );

            r_in_sum -= pr;
            g_in_sum -= pg;
            b_in_sum -= pb;

            stackOut = stackOut.next;

            yi += 4;
        }
        yw += width;
    }

   
    for ( x = 0; x     {
        g_in_sum = b_in_sum = r_in_sum = g_sum = b_sum = r_sum = 0;

        yi = x
;        r_out_sum = radiusPlus1 * ( pr = 像素[yi]);
        g_out_sum = radiusPlus1 * ( pg = 像素[yi 1]);
        b_out_sum = radiusPlus1 * ( pb = 像素[yi 2] );

        r_sum = sumFactor * pr;
        g_sum = sumFactor * pg;
        b_sum = sumFactor * pb;

        stack = stackStart;

      为（ i = 0; radiusPlus1; i )
        {
           stack.r = pr;
            stack.g = pg;
           stack.b = pb;
            堆栈 =下一个堆栈;
        }

        yp = 宽度;

        for( i = 1; i         {
            yi = ( yp x )

            r_sum = ( stack.r = ( pr = Pixels[yi])) * ( rbs = radiusPlus1 - i );
            g_sum = ( stack.g = ( pg = Pixels[yi 1 ) ])) * rbs;
            b_sum = ( stack.b = ( pb = Pixels[yi 2])) * rbs;

            r_in_sum = pr;
            g_in_sum = pg;
            b_in_sum = pb;

            stack = stack.next;

            if( i             {
                yp = 宽度;            }        }

        yi = x;
        stackIn = stackStart;
        stackOut = stackEnd;
        for ( y = 0; y         {
            p = yi             像素[p]   = (r_sum * mul_sum) >>> shg_sum;
            像素[p 1] = (g_sum * mul_sum) >> shg_sum;
            像素[p 2] = (b_sum * mul_sum) >> shg_sum;

            r_sum -= r_out_sum;
            g_sum -= g_out_sum;
            b_sum -= b_out_sum;

            r_out_sum -= stackIn.r;
            g_out_sum -= stackIn. g;
            b_out_sum -= stackIn.b;

            p = ( x (( ( p = y radiusPlus1)
            r_sum = ( r_in_sum = ( stackIn.r = Pixels[p]));
            g_sum = ( g_in_sum = ( stackIn.g = Pixels[p 1]));
            b_sum = ( b_in_sum = ( stackIn.b = Pixels[p 2]));

            stackIn = stackIn.next;

            r_out_sum = ( pr = stackOut.r );
            g_out_sum = ( pg = stackOut.g );
            b_out_sum = ( pb = stackOut.b );

            r_in_sum -= pr;
            g_in_sum -= pg;
            b _in_sum -= pb;

            stackOut = stackOut.next;

            yi = width;
        }
    }

    context.putImageData( imageData, top_x, top_y );

}

函数 BlurStack()
{
    this.r = 0;
    this.g = 0;
    this.b = 0;
    this.a = 0;
this.next = null;
}

使用方法：

复制代码代码如下：
stackBlurImage( sourceImageID, targetCanvasID, radius, BlurAlphaChannel );
stackBlurCanvasRGBA ( targetCanvasID, top_x, top_y, 宽度, 高度, 半径 );
stackBlurCanvasRGB( targetCanvasID, top_x, top_y, 宽度, 高度, 半径 );
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