使用OpenCV设置图像上的ROI [英] Set ROI on image with OpenCV

问题描述

大家好！

我正在图像处理领域，并且在编程领域我是一个初学者.
我想使用OpenCV库和C ++在图片上检测矩形.
如果我有白色背景，并且在图像中心大约有一个黑色背景的矩形，如何使用Opencv在图像上设置ROI.
图片尺寸为(800 * 600px)，矩形尺寸为(150 * 150px);
我不知道图像中的矩形到底在哪里.
这是灰度图像.

HI Everyone!

I am working in image processing and in this field of programming i am a beginner.
I wanna detect rectangel on picture i am using openCV librarys and C++.
How can i set a ROI on image, with Opencv, if i have white background and about in the center of image i have an rectangle with black background.
The image size is(800*600px) and the rectangel''s size (150*150px);
I dont know exactly where is that rectangle in image.
This is a gray scaled image.

Thank you advance!

推荐答案

，您可以使用霍夫变换来检测矩形.参见

you can use Hough Transform to detect rectangles. see http://www.google.co.in/url?sa=t&rct=j&q=detecting%20rectangle%20with%20hough%20transform&source=web&cd=4&ved=0CEcQFjAD&url=http%3A%2F%2Fciteseerx.ist.psu.edu%2Fviewdoc%2Fdownload%3Fdoi%3D10.1.1.59.4239%26rep%3Drep1%26type%3Dpdf&ei=thmeT8q-OMbMrQeOi9Vr&usg=AFQjCNH3Ar8j1qq5aeOtKD2fPLNOunub9A&cad=rja[^]

您是否要寻找检测矩形的算法或如何设置矩形以及未设置兴趣区(ROI)?

使用

Are you asking for an algorithm to detect a rectangle or how to set and unset Region of Interest(ROI)?

use

cvSetImageROI(img,cvRect(x,y,width,height));

设置ROI，其中img =图片，x，y是矩形的锚点

和

to set ROI where img = image, x,y are anchor points for the rectangle

and

cvResetImageROI(img);

取消ROI

然后所有处理将在指定的关注区域(ROI)内进行.

希望对您有帮助

to unset ROI

Then all processing will take place within the specified region of interest (ROI).

Hope this helps

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