虚拟边缘介绍及使用方法(2)

function copyMakeConstBorder_8U(__src, __top, __left, __bottom, __right, __value){
var i, j;
var width = __src.col,
height = __src.row;
var top = __top,
left = __left || __top,
right = __right || left,
bottom = __bottom || top,
dstWidth = width + left + right,
dstHeight = height + top + bottom,
value = __value || [0, 0, 0, 255];
var constBuf = new ArrayBuffer(dstWidth * 4),
constArray = new Uint8ClampedArray(constBuf);
buffer = new ArrayBuffer(dstHeight * dstWidth * 4);
for(i = 0; i < dstWidth; i++){
for( j = 0; j < 4; j++){
constArray[i * 4 + j] = value[j];
}
}
constArray = new Uint32Array(constBuf);
var tempArray;
for(i = 0; i < height; i++){
tempArray = new Uint32Array(buffer, (i + top) * dstWidth * 4, left);
tempArray.set(constArray.subarray(0, left));
tempArray = new Uint32Array(buffer, ((i + top + 1) * dstWidth - right) * 4, right);
tempArray.set(constArray.subarray(0, right));
tempArray = new Uint32Array(buffer, ((i + top) * dstWidth + left) * 4, width);
tempArray.set(new Uint32Array(__src.buffer, i * width * 4, width));
}
for(i = 0; i < top; i++){
tempArray = new Uint32Array(buffer, i * dstWidth * 4, dstWidth);
tempArray.set(constArray);
}
for(i = 0; i < bottom; i++){
tempArray = new Uint32Array(buffer, (i + top + height) * dstWidth * 4, dstWidth);
tempArray.set(constArray);
}
return new Mat(dstHeight, dstWidth, new Uint8ClampedArray(buffer));
}

效果图
CV_BORDER_REPLICATE

CV_BORDER_REFLECT

CV_BORDER_WRAP

CV_BORDER_CONSTANT

您可能感兴趣的文章: