标签:for alt ++ blog code gravity rip size func
这个功能可以在保留边缘的情况下对图像平坦区域进行模糊滤波,这个功能可以实现很好的磨皮效果,它的算法如下:
/* 表面模糊滤波 */ function surface(imgData, radius, threshold) { var width = imgData.width, height = imgData.height, pixelData = tempData = imgData.data; for (var i = 0; i < height; i++) { for (var j = 0; j < width; j++) { pos = (i * width + j) * 4; sumr = sumrw = sumg = sumgw = sumb = sumbw = 0; for (var n = -radius; n <= radius; n++) { for (var m = -radius; m <= radius; m++) { var x = CLIP3(i + n, 0, height - 1); var y = CLIP3(j + m, 0, width - 1); pos0 = (x * width + y) * 4; k = 1.0 - Math.abs(tempData[pos0] - tempData[pos]) / (2.5 * threshold); sumr += k * tempData[pos0]; sumrw += k; k = 1.0 - Math.abs(tempData[pos0 + 1] - tempData[pos + 1]) / (2.5 * threshold); sumg += k * tempData[pos0 + 1]; sumgw += k; k = 1.0 - Math.abs(tempData[pos0 + 2] - tempData[pos + 2]) / (2.5 * threshold); sumb += k * tempData[pos0 + 2]; sumbw += k; } } pixelData[pos] = CLIP2((sumr / sumrw) >> 0, pixelData[pos]); pixelData[pos + 1] = CLIP2((sumg / sumgw) >> 0, pixelData[pos + 1]); pixelData[pos + 2] = CLIP2((sumb / sumbw) >> 0, pixelData[pos + 2]); } } function CLIP2(a, b) { if (a < 0 || a > 255) { return b } else { return a } } function CLIP3(a, b, c) { return Math.min(Math.max(a, b), c) } imgData.data = pixelData; return imgData; }
标签:for alt ++ blog code gravity rip size func
原文地址:https://www.cnblogs.com/ckAng/p/10966637.html