java – 网络摄像头支持的图片大小

我正在尝试检索我的网络摄像头支持的可用图片尺寸分辨率;使用OpenCV库.我已经尝试使用类似的 Android问题/答案,但无济于事. (例如 Android camera supported picture sizes).这是我的代码：

import org.opencv.highgui.VideoCapture;
import org.opencv.core.Size;

public class MyCameraCaptureClass {

public static void main(String[] args) {
    System.out.println("Hello,OpenCV");
    System.out.println("This program will display the webcam's supported sizes");

    System.loadLibrary("opencv_java248"); //load .dll for the jar

    VideoCapture vidCap0 = new VideoCapture(0);

    if (vidCap0.isOpened()) {
        System.out.println("Camera found,and it works so far...");

        for (Size aSize : vidCap0.getSupportedPreviewSizes()) {
            System.out.println("Doesn't print this at all");
            System.out.println("Height:" + aSize.height + "Width:" + aSize.width);
        }
    }
    vidCap0.release();
    }
}

堆栈跟踪是：

Exception in thread "main" java.lang.Exception: unkNown exception
at org.opencv.highgui.VideoCapture.getSupportedPreviewSizes_0(Native Method)
at org.opencv.highgui.VideoCapture.getSupportedPreviewSizes(VideoCapture.java:478)
at webcam.MyCameraCaptureClass.main(MyCameraCaptureClass.java:19)

所有的帮助将得到真诚的赞赏.

return env->NewStringUTF(u.name);

// VideoCapture::get can return 0.0 or -1.0 if it doesn't support
// CV_CAP_PROP_SUPPORTED_PREVIEW_SIZES_STRING
if (u.prop != 0.0 && u.prop != -1.0)
    return env->NewStringUTF(u.name);