Android OpenCV 查找最大的正方形或矩形 [英] Android OpenCV Find Largest Square or Rectangle

问题描述

这可能已经得到回答，但我迫切需要一个答案.我想在 Android 中使用 OpenCV 找到图像中最大的正方形或矩形.我找到的所有解决方案都是 C++，我尝试转换它但它不起作用，我不知道我错在哪里.

This might have been answered but I desperately need an answer for this. I want to find the largest square or rectangle in an image using OpenCV in Android. All of the solutions that I found are C++ and I tried converting it but it doesn't work and I do not know where I'm wrong.

private Mat findLargestRectangle(Mat original_image) {
    Mat imgSource = original_image;

    Imgproc.cvtColor(imgSource, imgSource, Imgproc.COLOR_BGR2GRAY);
    Imgproc.Canny(imgSource, imgSource, 100, 100);

    //I don't know what to do in here

    return imgSource;
}

我在这里想要完成的是基于原始图像中找到的最大正方形(返回值 Mat 图像)创建一个新图像.

What I am trying to accomplish in here is to create a new image that is based on the largest square found in the original image (return value Mat image).

这就是我想要发生的:

1 个 http://img14.imageshack.us/img14/7855/s7zr.jpg

我只得到最大正方形的四个点也没关系，我想我可以从那里得到它.但如果我能返回裁剪后的图像会更好.

It's also okay that I just get the four points of the largest square and I think I can take it from there. But it would be better if I can just return the cropped image.

推荐答案

精明之后

1- 您需要使用 高斯模糊 和找到所有轮廓

1- you need to reduce noises with gaussian blur and find all the contours

2- 查找并列出所有轮廓区域.

2- find and list all the contours' areas.

3- 最大的轮廓就是画.

3- the largest contour will be nothing but the painting.

4- 现在使用透视变换将您的形状变换为矩形.

4- now use perpective transformation to transform your shape to a rectangle.

检查数独求解器示例以查看类似的处理问题.(最大轮廓+透视)

check sudoku solver examples to see the similar processing problem. (largest contour + perspective)

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