如何从一个OpenCV的RGB图像（图像3channel）访问图像数据

问题描述

我试图采取的imageData形象在这其中w =宽度形象和H =图像高度

 的for（int i = X; I＆LT; X + H，我++）//帧的像素高度
{
    对于（诠释J = Y; J＆LT; Y + W; J ++）//帧像素的宽度
    {
        INT POS = I * W *通道+ J; //渠道为3。RGB
        如果不存在任何数据//
        如果（数据并行＆GT;的imageData [POS] 0）//获取数据（这里是怎么走的问题）
        {
            XPOS + = j的;
            yPos + =我;
            nPix ++;
        }
    }
}
 

解决方案

jeff7给你一个链接到一个很老的版本的OpenCV。 OpenCV的2.0有一个新的C ++包装比在链接中提到的C ++封装好得多。我建议你​​阅读的关于如何访问各个参考像素。

另一个要注意的是：如果在外部循环为在y方向（垂直）的环和内环是在x方向上的循环。 OpenCV的是C / C ++，它排在各大门店的值。

I am trying to take the imageData of image in this where w= width of image and h = height of image

for (int i = x; i < x+h; i++) //height of frame pixels
{
    for (int j = y; j < y+w; j++)//width of frame pixels
    {
        int pos = i * w * Channels + j; //channels is 3 as rgb
        // if any data exists
        if (data->imageData[pos]>0) //Taking data (here is the problem how to take)
        {
            xPos += j;
            yPos += i;
            nPix++;
        }
    }
}

解决方案

jeff7 gives you a link to a very old version of OpenCV. OpenCV 2.0 has a new C++ wrapper that is much better than the C++ wrapper mentioned in the link. I recommend that you read the C++ reference of OpenCV for information on how to access individual pixels.

Another thing to note is: you should have the outer loop being the loop in y-direction (vertical) and the inner loop be the loop in x-direction. OpenCV is in C/C++ and it stores the values in row major.

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