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POcvExtractSURF throwing exception, incorrect size of input array ( ) in cvCreateSeq
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  1. POcvExtractSURF throwing exception, incorrect size of input array ( ) in cvCreateSeq
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    copied!<p>I'm using the following code with OpenCV on a Mac. The following function receives a path to an image file from another function, and that works fine. However, cvExtractSURF throws an exception stating:</p> <blockquote> <p>OpenCV Error: Incorrect size of input array () in cvCreateSeq, file >/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarb>alls_ports_graphics_opencv/opencv/work/OpenCV-2.4.1/modules/core/src/datastructs.cpp, line 372 terminate called throwing an exception</p> </blockquote> <p>The code is as follows:</p> <pre><code>- (int)extractFromImagePath:(NSString*)pathToFile{ [self.statusText setStringValue:@"image received"]; NSLog(@"Path: %@",pathToFile); // Path: /Users/loco/Desktop/testimage.png const char * path = [pathToFile UTF8String]; IplImage* image = cvLoadImage(path, CV_LOAD_IMAGE_GRAYSCALE ); cv::Mat im = cv::imread(path,0); if(im.data == NULL) { std::cout&lt;&lt;"Unable to read "&lt;&lt;path&lt;&lt;std::endl; return 0; } /* extract the SURF keypoints/descriptors of an image */ // presumes a previously declared IplImage *image CvSeq *keypoints = NULL; CvSeq *descriptors = NULL; CvMemStorage *storage = cvCreateMemStorage(0); cvExtractSURF(image, NULL, &amp;keypoints, &amp;descriptors, storage, cvSURFParams(0, 600)); // OpenCV Error: Incorrect size of input array () in cvCreateSeq, file /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_graphics_opencv/opencv/work/OpenCV-2.4.1/modules/core/src/datastructs.cpp, line 372 // terminate called throwing an exception [self.statusText setStringValue:@"writing to files"]; /* build a path to save a file in the documents directoy */ NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *docs = [paths objectAtIndex:0]; NSString *xmlpath_kp = [docs stringByAppendingPathComponent:@"keypoints.xml"]; NSString *xmlpath_desc = [docs stringByAppendingPathComponent:@"descriptors.xml"]; /* serialize to xml and save to disc */ cvSave([xmlpath_kp UTF8String], keypoints); cvSave([xmlpath_desc UTF8String], descriptors); [self.statusText setStringValue:@"done"]; /* don't forget your cleanup ;) */ cvReleaseImage(&amp;image); cvClearMemStorage(storage); return 1; } </code></pre> <p>Would anybody know what's going on? Any help would be appreciated!</p>
 

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