在opencv3.0中，Java中没有更多的highgui模块.

该功能被拆分为新的videoio和imgcodecs(您将在其中找到未读的)模块.

the functionality was split up into new videoio and imgcodecs (that's where you will find imread) modules.

import org.opencv.core.*;
import org.opencv.imgcodecs; // imread, imwrite, etc
import org.opencv.videoio;   // VideoCapture

编辑:将img=Highgui.imread(pathtoimage);更改为img = Imgcodecs.imread(pathtoimage);

和Core.rectangle(img, tl, br, color);到Imgproc.rectangle(img, t1, br, color);

我还将建议通过 OpenCV 3.0模块来解决这些错误.

I will also suggest go through OpenCV 3.0 modules to resolve these errors.