Very bad fps using Surf in Android
I'm trying to build an android app which detects a particular object in real time using SURF but I'm getting very bad fps (~0.2fps). I have little idea about OpenCv so please suggest what I can do or...
View ArticleColor levels in OpenCV
I wanted to do similar function like Photoshop Levels ... There are three input values e.g. 0, 1.0, 255 and two output values 0, 255 which is in range from 0 to 255. The input is also range from 0 to...
View ArticleIs this vec file any good
I'm trying to build a UAV classifier, but having little success. I know I need more sample but am I on the right track? [My Vec File](https://www.dropbox.com/s/cjq7ch501h0sazz/uav.vec?dl=0) has 300...
View Articlecap.set property is not working in C++
While cap.get property is working, I used cap.set property in a simple code but it doesn't seem to be working: cap.set(CV_CAP_PROP_FPS, 60); cap.set(CV_CAP_PROP_FRAME_HEIGHT, 360.0); for(;;) { cap...
View ArticleHow to evaluate light linearity and additivity with a camera
Hi, lastly I am questioning the linearity and additivity of light propagation in images. As the title says I would like to see what is the contribution of light to image pixel intensity values and if...
View Articleproblems with running OpenCV code
Hello, I train the cascade classifier to detect letters, here is the code I'm running: #include "opencv2/objdetect.hpp" #include "opencv2/highgui.hpp" #include "opencv2/imgproc.hpp" #include #include...
View ArticleDetecting corners of partially ocluded chessboard
Hello, For an application that I am working with, I am interested in detecting the chessboard corners regardless of weather or not the chessboard is fully visible. How can I detect all the corners of...
View Articledetecting a pallet in forklift
Im trying to detect the pallet in forklift. but find contours cant detect the rectangle in a correct way. how can I detect the large pallet. I have tried hough transform but it fails of detecting the...
View ArticleCan not change width height (-w -h parameter) in opencv_trainingcascade.exe???
Hello all, I try to use opencv_traincascade.exe to detect my object (rear of car). But i have a problem when i choose size -w -h. This is all af step i do. _ I have positive.txt which have absolute...
View ArticleSeperate very small touching objects...
Hi, I have video in which I am trying to separate very small fish that may come into contact with one another. I have tried using the watershed algorithm and it runs too slow and doesn't work every...
View ArticleError:Execution failed for task ':app:ndkBuildArmeabiV7aHardDebug'. > Process...
Hi I am currently trying to run my Android Studio application and I am getting this error during compilation. I think the erro has to do something with the build gradle. Can someone help me solve this...
View ArticleAndroid ArUco Axis swapping
I'm currently trying to develop a ArUco cube detector for a project. The goal is to have a more stable and accurate pose estimation without using a large ArUco board. For this to work however, I need...
View ArticleFreeing Memory with Python
I'm using OpenCV 3.1, Python 3.5, and Windows 7. When I load large pictures I get an insufficient memory error. I believe I would be able to avoid this if I were able to free the pictures I loaded in...
View ArticleMissing definitions after porting from 2.4.6 to 3.0
I am getting identifier-undefined compilation errors after porting my code from OpenCV 2.4.6 to 3.1. Examples: cv::cuda::ALPHA_OVER (was cv::gpu::ALPHA_OVER), the matrix reduction cv::cuda::minMax...
View Articlelibpng containing a security vulnerability
I am Using OPecnv in my app and published it on Play store but GOogle send me this mail pls help how to resolve this ERROR:- This information is intended for developers of apps that utilize any version...
View Articlebuilding opencv and opencv_contrib
So i need the dpm module in opencv, which is in contrib. And brew doesn't seem to install the separate contrib, only what's already part of the regular tree. Would appreciate some help in building...
View ArticleJava and haarcascade face and mouth detection - mouth as the nose
Today I begin to test the project which detects a smile in Java and OpenCv. To recognition face and mouth project used haarcascade_frontalface_alt and haarcascade_mcs_mouth But i don't understand why...
View ArticleHow to convert David Lowe keypoints into OpenCV keypoints?
I want to use [siftfast][1] for computing SIFT keypoints. The `Keypoint` structure is defined in `siftfast.h` as: typedef struct KeypointSt { float row, col; // Subpixel location of keypoint. float...
View ArticleCan't see new classes
Hi, I've created some new classes to include in the features2d package, but ,despite they are public, I can't call them in any other class. I created this class: header: http://pastebin.com/6p1QW9Ug...
View ArticleHow to draw gradient?
How can I draw gradient like this?  I want to draw gradient of circle. First idea, I could create a white line and empty image I. Then to go...
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