① 求教三种数字图像插值算法
何东健的《数字图像处理》光盘第六章有前两种的程序
完整程序已发你邮箱
核心代码如下：
for(y = 0; y < nNewHeight; y++)
{
//指向新图像第y行
//注意此处宽度和高度是新图像的宽度和高度
pNewTemp = pNewBits;
pNewTemp += (nNewHeight - 1 - y) * nNewWidthBytes;
//针对图像每列进行操作
for(x = 0; x < nNewWidth; x++)
{
//计算该像素在源图像中的坐标
int y0 = (long) (y / fYZoomRatio + 0.5);
int x0 = (long) (x / fXZoomRatio + 0.5);
//判断是否在源图范围内
if( (x0 >= 0) && (x0 < nOldWidth) &&
(y0 >= 0) && (y0 < nOldHeight))
{
//用双线性插值
if(bBilinear)
{
unsigned char *pTemp = Interpolation (nOldWidth, nOldHeight,
(float)x0, (float)y0,
nOldWidthBytes, nMovedBits, pOldBits);
//复制像素
memcpy(pNewTemp, pTemp, nMovedBits);
delete [] pTemp ;
}
else
//最近邻插值
{
//指向源图像第y0行，第x0个像素
//注意此处宽度和高度应该互换
pOldTemp = pOldBits;
pOldTemp += (nOldHeight - 1 - y0) * nOldWidthBytes;
pOldTemp += x0 * nMovedBits;
//复制像素
memcpy(pNewTemp, pOldTemp, nMovedBits);
}
}
pNewTemp += nMovedBits;
}
}