How to generate key points by myself
Hi, i want to compute SURF descriptors on my own key points. The problem is, currently I only have 2d image points (x,y-coordinates), but opencv's method for calculating SURF descriptors needs...
View ArticleExpose native C++ OpenCV code to Android - but clever (== less work) way!
Hi fellow coders! I've written desktop OpenCV-based C++ app that can be described as following blackbox sequence: Image from camera -> A LOT OF PROCESSING HERE -> std::tuple eyesPosition, bool...
View ArticleProblem with detectMultiScale and drawing returned rectangles
I trained a cascade classifier to detect pencils/pens. The cascade is quit ok, i assume. I have following Problems: 1. detectMultiScale(...) does not detect pens as separate objects if they are close...
View ArticleCannot run a script that executes my opencv program at startup under Linux
Hi there, I would need some help there. I'm trying (since this morning) to make a script that can launch my opencv program at startup. The script does work well : #!/bin/sh export...
View Articlealignment and equalizehist
I'm basing my project on the facerecognizer tutorials, but i'm not sure if i do either. Would recognition still work or would it be severely affected? I think it works pretty well right now but...
View ArticleHow to map Java's List to vector of vectors?
The `decode` method of the contributed structured_light module uses an `InputArrayOfArrays` parameter which is mapped to a `List` type in the Java wrapper. In the method the parameter is cast to a...
View ArticleIs there any range of values for the exposure flag?
What is the unit of exposure value? seconds? . Also, is there any range of value?
View ArticleBinary mask: find positive neighbour pixels
Hello, I have a binary mask (CV_8UC1). I want to find all POSITIVE neighbour pixels to a given pixel. The idea is to implement something similar to GIMP's magic wand selection, in which a user selects...
View ArticleError in mass center calculation through moments()
I'm trying to calculate the mass center of images using OpenCV and I got errors, as you can see in the images (the mass center must not be to closest of any side in this cases). Also, I got mass...
View ArticleUpdate Python bindings cv2.so after changing opencv source
I have modified the opencv cascade classifier's source code for object detection to incorporate new functionality. I made changes to the source code of opencv_createsamples and opencv_traincascade...
View ArticleDoes OpenCV1.0 support Windows8.1?
Hi I'm using OpenCV1.0 and Windows7 and VisualStudio2010. It works well. I would like to use Windows8.1, there is no information whether OpenCV1.0 supports or not. Could you tell me?
View Articledlopen libopencv_java3.so failed using java.lang.System.loadLibrary
i encounter a question that loading libopencv_java3.so failed after i update the android version into N. This open lib can be loaded correctly on android M version. libopencv_java3 is got directly from...
View ArticleTrouble using threshold() function in opencv
I am trying to segment input image using watershed method. In that i am using threshold(), however my program gets aborted with the following error on the terminal **unsupported format or combination...
View ArticleOpenCV 3.1 HAL functions in lapack
I am trying to get the concept of HAL, but right now in some parts (lapack.cpp) it looks a bit confusing: First, we have HAL intrinsics implementations in separate headers, one of which is chosen...
View ArticleTransferring figure handle from OpenCV to Scilab
Is there any way to transfer figure handles from OpenCV to Scilab. I need this because if I open any graphic window using OpenCV in Scilab via Scilab API, I am unable to close the window.
View ArticleHow does the Transcascade collect negative samples?
Hi all, e.g. numPos 2000, numNeg 1000, numStages 10, -w 20, -h 20, minHitRate 0.995, maxFalseAlarmRate 0.2 I have some question about collecting neg samples. 1.According to the answer of the...
View ArticleTracking multiple deformable objects using OpenCV
Hello Community, I am new in OpenCV and in tracking topic. I have a lot of experience in computer vision, but in the area of industrial applications. My current task is more a research topic from the...
View ArticleCascade Training does not work with binary images
I am working on a project and I am trying to train a cascade classifier to detect faces. The problem is that my faces are first filtered and then thresholded, so the result is a binary image with the...
View ArticleCascadeClassifier Training - pressing "Return" Key continues computation.
Hello, I've seen problems for the application opencv_traincascade.exe being stuck in finding enough negatives samples, so that the application stops on terminal output `NEG current samples: x`. I...
View ArticleCan anyone let me know how can I use CvLevMarq class for 11 number of parameter?
I want to implement Levenberg-Marquardt Algorithm on a set of 11 number of parameters. Has anyone used CvLevMarq which can be used for non-linear square approximation? Any literature regarding the...
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