Java opencv 叠加图片，添加logo图

转自烂代码网: Java opencv 叠加图片，添加logo图

https://trashcode.cn/post/d/88c23686-ceb6-4bad-b17e-3cd4640c2cd6

利用Java Opencv包，叠加图片

比如，有两张图片，背景图，待添加的logo图

背景图:

待添加的logo图:

1.添加Java Opencv的package，在maven中设置

<dependency>
<groupId>org.bytedeco</groupId>
<artifactId>opencv</artifactId>
<version>4.3.0-1.5.3</version>
</dependency>

2.将logo图添加到背景图左上角位置，代码如下：

import static org.bytedeco.opencv.global.opencv_imgcodecs.imread;
import static org.bytedeco.opencv.global.opencv_imgcodecs.imwrite;
import static org.bytedeco.opencv.global.opencv_imgproc.resize;
import static org.bytedeco.opencv.helper.opencv_imgcodecs.cvLoadImage;
import org.bytedeco.opencv.global.opencv_core;
import org.bytedeco.opencv.opencv_core.Mat;
import org.bytedeco.opencv.opencv_core.Rect;
import org.bytedeco.opencv.opencv_core.Size;

public void overlapPhoto() {
//背景图
String sourceImg = "background.jpg";
//待添加的背景图logo
String addImg ="logo.jpg";
//叠加以后的图片文件名
String mixImgPath="overlayPhoto.jpg";
try {
//读取背景图
Mat srcImageMat = imread(sourceImg);
//读取logo图片
Mat addImgMat = imread(addImg);
//获取logo的宽
int addImgMatcols = addImgMat.cols();
//获取logo的高
int addImgMatrows = addImgMat.rows();
//logger 输出信息
LOGGER.info("addimg cols:{},rows:{},size:{}", addImgMatcols, addImgMatrows, addImgMat.size());

//设置mask
Mat mask = imread(addImg,0);

//设置在背景图上需要叠加的区域，如下，x,y为10开始，长宽分别为logo的长宽
//设置的长宽比如满足x+logo.width<=src.width,y+logo.height<=src.width...
//否则 throw exception
Mat srcRoi = new Mat(srcImageMat, new Rect(10, 10, addImgMat.cols(), addImgMat.rows()));
LOGGER.info("srcRoi cols:{},rows:{}", srcRoi.cols(), srcRoi.rows());
addImgMat.copyTo(srcRoi, mask);
//写入图片进行叠加
imwrite(mixImgPath, srcImageMat);
LOGGER.info(mixImgPath);
LOGGER.info("Overlap completed!");
} catch (Exception e) {
LOGGER.error("", e);
}
}

结果如下：

*若无logger设置，将实例中logger替换为System.out.println 即可