如何使用OpenCV从Java中的静态图像中删除背景?

问题描述：

我正在尝试从具有一枚硬币或一张钞票的图像中删除背景.

I'm trying to remove the background from an image that has either one coin or one bill.

我尝试以下代码:

BackgroundSubtractorMOG BGS = new BackgroundSubtractorMOG(); 
BGS.apply(src, dest,0.1);

结果是黑色图像.

如何在Java中使用opencv做到这一点?

How can I do that in java using opencv?

图像将从相机中捕获，因此它可能具有背景，我想删除背景，图像可能像这样:

The image will be captured from the camera and so it could have background ,I want to remove the background ,, the image could be like that :

答

这是分割帐单的简单过程.基本上，由于背景是均匀的，因此您只需计算边缘的边界框即可.

This is a simple procedure to segment the bill. Basically, since background is uniform, you simply compute the bounding box of the edges.

此代码是C ++，但应易于移植到Java.请注意，您的jpeg图像具有许多压缩伪像.如果您有未压缩的图像(png)，效果会更好.

This code is in C++, but it should be easily ported to Java. Note that your jpeg image has many compression artifacts. If you have a non-compressed image (png) the result would be better.

#include <opencv2\opencv.hpp>
using namespace cv;
using namespace std;

int main() 
{
    Mat3b img = imread("path_to_image");

    Mat1b gray;
    cvtColor(img, gray, COLOR_BGR2GRAY);

    Mat1b edges;
    Canny(gray, edges, 400, 100);

    vector<Point> points;
    findNonZero(edges, points);

    Rect box = boundingRect(points);

    Mat3b bill(img(box));

    return 0;
}

bill图片:

如何使用OpenCV从Java中的静态图像中删除背景?

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