Question

我在OpenCV中有点新鲜，我想练习一个简单的面部检测和图像裁剪。

具体来说，我使用return false;从文件夹加载图像，然后检测到面部，在检测到的面部上绘制一个矩形，然后仅裁剪检测到的面部区域。

一切正常，检测到脸部，在当场绘制矩形。除了最后一部分：种植。我收到臭名昭着的 Restcomm错误。以下是我的代码和错误：

2017-08-21 11:22:15,581 ERROR [org.mobicents.slee.runtime.sbbentity.SbbEntityImpl] (SLEE-EventRouterExecutor-1-thread-1) Failed to assign and create sbb object
java.lang.ClassCastException: org.mobicents.slee.resource.jdbc.JdbcResourceAdaptorSbbInterfaceImpl cannot be cast to org.restcomm.slee.resource.jdbc.JdbcResourceAdaptorSbbInterface
    at sn.pmf.jdbc.jdbcSbb.setSbbContext(jdbcSbb.java:147)
    at org.mobicents.slee.runtime.sbb.SbbObjectImpl.<init>(SbbObjectImpl.java:124)
    at org.mobicents.slee.runtime.sbb.SbbObjectPoolFactory.makeObject(SbbObjectPoolFactory.java:146)
    at org.apache.commons.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:974)
    at org.mobicents.slee.runtime.sbb.SbbObjectPoolImpl.borrowObject(SbbObjectPoolImpl.java:68)
    at org.mobicents.slee.runtime.sbbentity.SbbEntityImpl.assignSbbObject(SbbEntityImpl.java:744)
    at org.mobicents.slee.runtime.eventrouter.routingtask.EventRoutingTaskImpl.routeQueuedEvent(EventRoutingTaskImpl.java:362)
    at org.mobicents.slee.runtime.eventrouter.routingtask.EventRoutingTaskImpl.run(EventRoutingTaskImpl.java:128)
    at org.mobicents.slee.runtime.eventrouter.EventRouterExecutorImpl$EventRoutingTaskStatsCollector.run(EventRouterExecutorImpl.java:72)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

错误：

OpenCV错误：断言失败（0＆lt; = roi.x＆amp;＆amp; 0＆lt; = roi.width＆amp;＆amp; roi.x + roi.width＆lt; = m.cols＆amp;＆amp; 0＆lt; cv :: Mat :: Mat中的; = roi.y＆amp;＆amp; 0＆lt; = roi.height＆amp;＆amp; roi.y + roi.height＆lt; = m.rows），文件C：\ build \ master_winpack -build-win64-vc14 \ opencv \ modules \ core \ src \ matrix.cpp，第522行

现在我明白错误显示了，因为public void setSbbContext(SbbContext context) { this.tracer = context.getTracer("JdbcExampleSbb"); this.contextExt = (SbbContextExt) context; this.jdbcRA = (JdbcResourceAdaptorSbbInterface) this.contextExt .getResourceAdaptorInterface(JdbcResourceAdaptorSbbInterface.RATYPE_ID, "JDBCRA"); this.jdbcACIF = (JdbcActivityContextInterfaceFactory) this.contextExt .getActivityContextInterfaceFactory(JdbcActivityContextInterfaceFactory.RATYPE_ID); }超出范围。这里有什么麻烦我。

当我尝试首先绘制矩形时，我不应该收到此错误吗？为什么我会在cv::glob上收到错误但不会在我正在绘制的矩形上出现错误？
为什么Assertion Failed超出范围？我用它上面绘制的矩形显示图像，一切看起来都很好。当void faceDetectFolder() { Mat source; CascadeClassifier face_cascade; face_cascade.load("C:/OpenCV-3.2.0/opencv/sources/data/haarcascades/haarcascade_frontalface_alt2.xml"); String path(path on my PC); std::vector<cv::String> fn; glob(path, fn, true); for (size_t i = 0; i < fn.size(); i++) { source = imread(fn[i]); if (source.empty()) continue; std::string imgname = fn[i].substr(45, std::string::npos); //File name std::vector<Rect> faces; face_cascade.detectMultiScale(source, faces, 1.1, 2, 0 | CV_HAAR_SCALE_IMAGE, Size(30, 30)); for (int i = 0; i < faces.size(); i++) { if (faces[i].width > 80 && faces[i].height*0.5 > 80) //Threshold, some detections are false { int x = faces[i].x; int y = faces[i].y; int h = y + faces[i].height; int w = x + faces[i].width; rectangle(source, Point(x, y), Point(w, h), Scalar(255, 0, 0), 2, 8, 0); //Drawing rectangle on detected face imshow(imgname, source); Rect roi; roi.x = x; roi.y = y; roi.height = h; roi.width = w; Mat detectedface = source(roi); imshow("cropped image", detectedface); waitKey(0); } } } }与绘制的矩形具有相同的值时，为什么会出现此错误？

请原谅我任何新手的错误，我们都从某个地方开始。感谢您阅读并度过美好的一天！

Answer 1

在roi.height和roi.width中，尝试提供faces[i].height和faces[i].width 分别。实际上你认为错误应该在之前出现，但它适用于绘图，因为矩形在两个对角线相对的顶点上作为参数，而在Rect roi的情况下不是宽度/高度。您可以使用Rect和Point(x, y)初始化Point(w,h)，它应该可以正常工作。

OpenCV人脸检测ROI断言失败

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