How to ensure that extractor does not remove keypoints
I'm working with a framework that relies on keeping the number of keypoints constant before and after descriptor extraction. So far I applied a detection mask such that keypoints are not detected if...
View ArticleNode.js + OpenCV readImage() memory leaks
I have a problem with memory leaks (about 3-4MB each even cycle of this code) on node.js + opencv. I think readImage() method causes that memory issue. How to free unused memory? I've tried release()...
View ArticleTake every Nth element of a matrix
I am trying to create a block average filter of an image. In Matlab my code looks like: ba=4; %block average block size B = ones(ba)/ba^2; out1 = conv2(double(rgb_img(:,:,1))/255,B,'valid'); out1 =...
View ArticleWHY ARE SPLIT MATS NOT CONTINOUS
so I split an into is seperate colors (using split on the matrix). When I then try to reshape one of the resulting matrix I get the following error: OpenCV Error: Image step is wrong (The matrix is not...
View ArticleI did added the Libraries still this Error for these perticular Classes
the import org.opencv.core.dmatch cannot be resolved and also import org.opencv.imgcodecs.Imgcodecs cannot be resolved
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yaacov gorsd
There really isn't a approach to identify these kinds of foreclosure properties. The start to take a look is made for an under served consumer group. Property is the "pension plan" of option for me and...
View ArticleHOG People Detector on image
I'm try to use HOG People Detector for obtain Region of Interest. I have this depth image  and the istruction is: HOGDescriptor hog;...
View ArticlePedestrian detection - strategies for eliminating false positives
I'm using the DefaultPeopleDetector with the SVM detector to detect and track bodies in a video stream. I've played with some of the parameters (ex. the "hit threshold" passed to detectMultiScale), but...
View ArticleCan I access the query and train descriptors from a flann.knnMatch() function?
For ORB, the match object comes with the descriptors. Can similar information be accessed with SIFT? sift = cv2.xfeatures2d.SIFT_create() # find the keypoints and descriptors with SIFT kp1, des1 =...
View ArticleCan StereoSGBM support 16bit single channel?
Hello guys, Once I was trying to use StereoSGBM compute to process 3D depth map with 16 bit single channel images via python + OpenCV3, OpenCV showed an error like "the left image's depth doesn't...
View ArticleBuilding opencv 3.1.0 on Ubuntu 16.04
Hi, I'm trying to build opencv from scratch on ubuntu 16.04 following instructions from here. (http://milq.github.io/install-opencv-ubuntu-debian/), but keep running into this libtiff error see...
View ArticleRTSP stream using VideoCapture, transition from 2.4.11 to 3.1
Hello everyone, I am a little bit lost and would like to hear your advice on my problem: (Platform ist win32, x86 + x64) We are trying to upgrade from OpenCV 2.4.11 to OpenCV 3.1 . So far, it all...
View ArticleOpenCV 3.0.1 and Android Studio 2.1.1, it's posible to build with API level...
This problem is making me crazy. I'm using Android Studio with OpenCV for Android 3.1.0 when I build my project with "compileSdkVersion 21" and "targetSdkVersion 21" everything goes right, but if I...
View ArticleopenCV dll problem : no opencv_java2413 in java.library.path
I'm unable to get OpenCV to work within my Groovy/Grails web application, I've successfully included the jar and I can import all the libraries but when I try to run my app I get the following error...
View ArticleTransformation (rotation and translation) between 2 images
Hi, I have this 2 images :  and  I want to calculate the rotation and translation between the...
View ArticleSeperate touching Objects
What is the best way to quickly seperate two close objects? For example those two rectangles are so close, their shadows overlap and get very dark. Using my initial approach to binarize the image and...
View ArticleHow to use connectedComponentsWithStats in android/java?
Hello, i want to find object from mat(blim) with use of connectedComponentsWithStats.but i dont know how to use this in java so please help me .. C++ code:- Mat labels, stats, centroids; int numObjects...
View Articleresponses in interest point
I know response in SURF object is represented the strength of keypoint, but I confused how is open cv compute value of responses from keypoint object?
View ArticlePython-openCV: Extracting (x,y) coordinates of point features on an image
Hi all, I am trying to extract the (x,y) coordinates of the the four corners of a wooden rectangular plank image and apply that to a real-time video feed. What I have in mind is: 1) read image and...
View ArticleSpectral Residual Approach Hit Rate and False Alarm Rate
Could anyone tell me how to derive the Spectral Residual Approach Hit Rate and False Alarm Rate below? Equation 11 and 12  Besides, what does it mean...
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