c# - 将较小的图像放入较大的图像中。

Question

我需要将较小的图像放在较大的图像中。较小的图片应该在较大的图片中居中。我正在使用 C# 和 OpenCV，有人知道该怎么做吗？

Answer 1

这对我有用

LargeImage.ROI = SearchArea; // a rectangle
SmallImage.CopyTo(LargeImage);
LargeImage.ROI = Rectangle.Empty;

当然是 EmguCV

Answer 2

楼上的回答太好了！下面是一个在右下角添加水印的完整方法。

public static Image<Bgr,Byte> drawWaterMark(Image<Bgr, Byte> img, Image<Bgr, Byte> waterMark)
    {

        Rectangle rect;
        //rectangle should have the same ratio as the watermark
        if (img.Width / img.Height > waterMark.Width / waterMark.Height)
        {
            //resize based on width
            int width = img.Width / 10;
            int height = width * waterMark.Height / waterMark.Width;
            int left = img.Width - width;
            int top = img.Height - height;
            rect = new Rectangle(left, top, width, height);
        }
        else
        {
            //resize based on height
            int height = img.Height / 10;
            int width = height * waterMark.Width / waterMark.Height;
            int left = img.Width - width;
            int top = img.Height - height;
            rect = new Rectangle(left, top, width, height);
        }

        waterMark = waterMark.Resize(rect.Width, rect.Height, Emgu.CV.CvEnum.INTER.CV_INTER_AREA);
        img.ROI = rect;
        Image<Bgr, Byte> withWaterMark = img.Add(waterMark);
        withWaterMark.CopyTo(img);
        img.ROI = Rectangle.Empty;
        return img;
    }