如何从打开的cv中的图像访问第一个5 * 5块？ [英] How to access first 5*5 block from an image in open cv?

问题描述

任何人都可以帮助我访问第一个5 * 5块从一个图像？我是新的打开CV，我正在编码的C ++。我搜索net.If任何人都可以回答这将使我的工作更容易。

Can anyone please help me to access first 5*5 block from an image?I am new to open CV,I am doing the coding in c++.i searched over net.If anyone could answer this it would make my work easier.

推荐答案

您可以使用 cv :: Mat :: operator code>。

You can access image ROI using the cv::Mat::operator().

例如，要获取图像的第一个5x5块，您可以执行以下操作：

e.g, to get the first 5x5 block of the image, you can do the following:

int roi_origin_x = 0;
int roi_origin_y = 0;
int block_width = 5;
int block_height = 5;

cv::Rect roi(roi_origin_x, roi_origin_y, block_width, block_height);

cv::Mat region = image(roi);

要访问特定块号，例如（i，j），只需更改块的原点this：

To access a specific block number e.g (i,j), just change the origin of the block like this:

int block_width = 5;
int block_height = 5;
int roi_origin_x =  i * block_width;
int roi_origin_y = j * block_height;

cv::Rect roi(roi_origin_x, roi_origin_y, block_width, block_height);

roi可能会超出图像范围，因此请确保应用检查将其保留在图像边界，

The roi may go out of image bounds, so make sure you apply the checks to keep it inside the image boundary,

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