如何从相机预览中检测现有图像？

Question

我必须从摄像头预览中检测到android项目中的现有图像，而不需要拍摄图像，我到处都是，但我发现我必须使用opencv，但找不到很好的示例（解决方案必须看起来像条形码检测）如果有任何想法，请告诉我谢谢。

Answer 1

What do you mean by "Existing Image"? Do you have the physical address of the image? If so, you can load image with opencv android wrapper. For instance, if you know the physical address of the image, then you can load it and send it to ImageView using the following codes:

BitmapFactory.Options bitmapOptions = new BitmapFactory.Options();

Mat m = Imgcodecs.imread(picturePath);

Bitmap bm = Bitmap.createBitmap(m.cols(), m.rows(),  Bitmap.Config.ARGB_8888);
Imgproc.cvtColor(m, m, Imgproc.COLOR_BGR2RGB); // Images are natively in BGR color space in opencv. To show it properly in android project, convert the color space to RGB
Utils.matToBitmap(b, bm);
image_view.setImageBitmap(bm);

You can show an image wherever it is.