使用opencv在Android中裁剪图像 [英] Cropping image in Android using opencv

问题描述

我正在Android中使用OpenCV 2.3.1.我需要将图像裁剪成一半. 我正在做的是:

I am using OpenCV 2.3.1 in Android. I need to crop the image into half. What I am doing is:

    Mat mIntermediateMat2 = new Mat(frame_height,frame_width,rgba.type);
    mIntermediateMat2 = rgba.clone();
    mIntermediateMat2 = mIntermediateMat2.rowRange(0,frame_height/2);

第三步将完成这项工作，还是我还要添加更多内容? 我在opencv 2.3文档中看到了Mat :: operator()，但不幸的是无法在opencv Android程序包中找到.

Will the third step do the job or I have to add something more? I saw Mat::operator() in opencv 2.3 documentation but unfortunately not able to find in the opencv Android package.

推荐答案

Mat类有一些构造函数，其中一个构造函数包含Mat和ROI(感兴趣的区域).

There are a few constructors for the Mat class, one of which takes a Mat and an ROI (region of interest).

以下是在Android/Java中执行此操作的方法:

Here's how to do it in Android/Java:

Mat uncropped = getUncroppedImage();
Rect roi = new Rect(x, y, width, height);
Mat cropped = new Mat(uncropped, roi);

这篇关于使用opencv在Android中裁剪图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！