Heim >Web-Frontend >js-Tutorial >javascript图片相似度算法实现 js实现直方图和向量算法_javascript技巧
return arr;
}
function cosine(arr1, arr2) {
var axb = 0,
a = 0,
b = 0;
for (var i = 0, len = arr1.length; i axb += arr1[i] * arr2[i];
a += arr1[i] * arr1[i];
b += arr2[i] * arr2[i];
}
return axb / (Math.sqrt(a) * Math.sqrt(b));
}
function gray(imgData) {
var data = imgData.data;
for (var i = 0, len = data.length; i var gray = parseInt((data[i] + data[i + 1] + data[i + 2]) / 3);
data[i + 2] = data[i + 1] = data[i] = gray;
}
return imgData;
}
有个问题,假如图片是灰色的跟原图进行比较,那么要比较相似度,需要将图片都转成灰色的,即使用上面代码的gray函数来处理