OpenCV:如何迭代图像特定区域中的每个像素 [英] OpenCV: How to iterate each pixel in a specific area of an image

问题描述

我有一个用两条平行的绿线标记的图像(见下文).在C ++中的OpenCV Mat中读取此图像，绿线的斜率及其到图像中心的距离是已知的.

I have an Image(see below) that is marked by two parallel green lines. This image is read in a OpenCV Mat in C++, the slope of green lines and their distances to the image center are already known.

现在，我要迭代这两条绿线之间区域中的所有像素.我怎么解决这个问题?如果有人可以给我一个代码示例，这将非常有帮助.

Now I want to iterate all the pixels in the area between these two green lines. How can i solve this problem? It will be very helpful, if somebody can give me a code example.

非常感谢.

推荐答案

您可以使用 LineIterator

看看下面的示例代码

#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include <iostream>

using namespace std;
using namespace cv;

int main( int, char** argv )
{
    Mat src;
    src = imread( argv[1] );

    if( src.empty() )
    {
        return -1;
    }

    Point pt1 = Point( (src.cols / 5) + (src.cols / 8), src.rows);
    Point pt2 = Point( (src.cols ) - (src.cols / 8), 0);

    LineIterator it(src, pt1, pt2, 8);

    for(int y = 0; y < it.count; y++, ++it)
    {
        Point it_pos = it.pos();
        for(int x = it_pos.x; x < it_pos.x+(src.cols / 5) & x < src.cols; x++)
        {
            Vec3b & pixel = src.at<Vec3b>(it_pos.y,x);
            pixel = pixel * 1.3;
            pixel[0] = 0;
        }

    }

    imshow("result", src );
    waitKey(0);

    return 0;

}

结果图像(查看编辑历史记录以更好地了解更改):

result images (look edit history to understand changes well):

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