SVM predict multiclass
Im curious about how to go about using the predict method in SVM for a multi class object detector using BoF and SIFT. Ive trained the svm with 8 classes, and when I call predict it determines the...
View ArticleExtract largest contour in very colorful image in OpenCV
I have an image of object with lots of different color and other small contours. I would like to find the largest contour in the image (airplane door). The image (door) can contain lots of painting...
View ArticleHow do I convert an cv::Mat to float pointer?
I want to represent the matrix of `cv::SIFT` descriptors `cv::Mat descriptors` as `float*`. This is because I want to use [GMM from VLFeat][1] (if you any better solution, please let me know). This is...
View Article3D clod point to 2D image
Hello, I have 3D point cloud data which I want to convert into 2D image and save to the disk as 16 bit png image. I am using projectPoints() function which is giving me the projected points in the form...
View ArticlesolvePnP non-zero error?
With OpenGL, I created a virtual world with objects and a camera. I made a list of tuples (an object's world_coord x y z, an object's pixel_coord x y) where z = 0. I calculated rvec and tvec with...
View Articleopencv_error_code-215_channels
Hi, Does anyone know why I'm getting the error message below : Thanks, OpenCV Error: Assertion failed (channels() == CV_MAT_CN(dtype)) in copyTo, file...
View ArticleUse openCV to determine html tag.
Given UI of a webpage built using Bootstrap image . How to identify the bootstrap elements present in the UI.
View ArticleHow feature matching works in opencv?
I have the (x,y) location of points in two images now I want to perform keypoint matching
View ArticleImprove Image Quality in Java(OpenCV)
Hi Guys, So i am working on an application where the use uploads images and at times the image quality is real bad so i am using an OCR to get data from the image because the quality of the image is...
View ArticleHow to set up a "side-OpenCV" / set path to another opencv
Hey everyone, I'm working on a station without sudo rights. Installed is a OpenCV V. 2.3.x. Now for my needs this isn't sufficient. However I was able to download and compile the latest Version `make`...
View ArticleNeed help understanding how the HOGDescriptor class works in Java 3.1.0
I am trying to extract HOG features from an image using OpenCV in Java. I have previously done this in MATLAB using its built in HOG functions, but I am having trouble doing it with OpenCV. In the...
View ArticleHow to train classifiers the best way possible
Hello, i am trying to train a cascade classifier with opencv_traincascade. There are a few tutorials and posts about that, but all of them seem to be either outated or are contradictory. Also i am...
View ArticleImage Retrieval through fisher vectors: why my implementation works SO BAD?
I'm trying to implement a Content Based Image Retrieval system for small image-dataset. By now, I'm using 1k images (40 categories) from [Caltech101][1]. This is the system workflow: 1. For each image...
View ArticleApproaching in Image Moments OpenCV
Hi, is it exists any type of approaching in Image Moments method in OpenCV when it finding mass center? Thank you)
View ArticleHow to read text from image and print save text to a file?
Hi, i am new to opencv and was wondering if there was a way to extract text from an image? If possible how would we be able to save the text into a file (i.e. txt)?
View ArticleNeed update OpenCV manager APK for google play warning!
Hi All , Could you update the patch to the OpenCV manager APK for android ? The APK is too old in Google play with Libpng issue . I am Java newbie and hardly to compile it because need Linux/C++...
View ArticleMeasuring Planar Objects with a Calibrated Camera
I would like to measure some coins placed on top of a calibration plate, as per this matlab example http://mathworks.com/help/vision/examples/measuring-planar-objects-with-a-calibrated-camera.html ....
View Articleproblem to use eclipse with opencv on ubuntu
[Workspace 1_028.jpg](/upfiles/14691709248234263.jpg)Dear all, I am using Ubuntu 16.04 LTS, I followed the tutorial...
View ArticleOpenCV 3.0 Failed to Build
[ 33%] Building CXX object modules/features2d/CMakeFiles/opencv_features2d.dir/src/keypoint.cpp.o [ 33%] Building CXX object...
View Articlehttp://www.supplements4us.com/alpha-tren/
barbells. Last, work out on the heavy machinery.Alpha Tren Before the beginning of your actual routine, find some good goals for yourself and define them thoroughly. Lifting weights that are more...
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