OpenCV(Java):在“相机视图"上绘制一个矩形区域 [英] OpenCV (Java) : Draw a rectangle region on Camera View

问题描述

我正在尝试使用OpenCV在android上创建银行卡扫描仪，首先，我创建了一个区域，用户可以在该区域扫描其卡，然后将其裁剪，然后在矩形区域中苦苦挣扎并将其放置在中心，关于我该怎么做的任何建议?非常感谢

I'm trying to create a bank card scanner on android using OpenCV, first, I'm creating a region where the user can scan their cards then crop it after, I'm struggling with the rectangle region and place it on the center, Any suggestion on how I can do it? Thank you so much

这是我到目前为止所做的:

Here's what I've done so far:

它正在做一个矩形并居中，但是大小不够，我试图更改数字，但位置未居中.

 public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame) {
        Mat mrgba = inputFrame.rgba();

        int w = mrgba.width();
        int h = mrgba.height();

        Imgproc.rectangle(mrgba, new Point(w * 1 / 3, h * 1 / 3), new Point(
                w * 2 / 3, h * 2 /  3 ), new Scalar( 255, 0, 0 ), 5
        );

        return mrgba;
    }

输出

推荐答案

尝试一下:

int w = mrgba.width();
int h = mrgba.height();
int w_rect = w*3/4; // or 640
int h_rect = h*3/4; // or 480

Imgproc.rectangle(mrgba, new Point( (w-w_rect)/2, (h-h_rect)/2 ), new Point(
            (w+w_rect)/2, (h+h_rect)/2 ), new Scalar( 255, 0, 0 ), 5

确保 w_rect 和 h_rect 分别小于 w 和 h .

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