How do I find an object in image/video knowing its real physical dimension?
0 down vote favorite I have a sample of images and would like to detect the object among others in the image/video already knowing in advance the real physical dimensions of that object. I have one of...
View Articleinstall opencv 2.4.13
I am using ODROID (arm board) with Ubuntu 14.04 and initial installed Opencv 2.4.8. And I want use to the newest version which is 2.4.13. I followed the...
View ArticleCan the SfM module of OpenCV being used to get a SLAM like result?
I have a project in mind, where I want to achieve something like [this](https://www.youtube.com/watch?v=QqnInxq1g0w&t=1m31s ). Kinda like give that 3D perception to it. No need for mapping. Just...
View ArticleOpenCV Projection Matrix Choice
Hi, I am currently facing a problem, to depict you what my programm does and should do, here is the copy/paste of the beginning of a previous post I've made. This program lies on the classic "structure...
View ArticleHow to sort contours left to right, while going top to bottom using Python
I'm finding the contours for an image with digits and characters, for OCR. So, I need the contours to be sorted left to right, while going line to line, i.e. top to bottom. Right now, the contours...
View ArticleSimple example of writing color imagery using VideoWriter in python
I want to be able to write out a color raster for each video from in python. However, when I pass a 3d array to video writer, it generates a bad output. What am I doing wrong? Sampled code below.......
View ArticleMeasuring from 3D photos
i have two photos taken by a car like google street view car, this photos has 80% overlap, i have the photo coordinates in UTM system, omega phi kappa, calibration values like p1,p2,k1,k2, sensor...
View Articlewhat is "public camera_activity() { }"?
public camera_activity() { } " public camera_activity() { }" is deprecated? I can see " public camera_activity() { }" in old android source code I am using opencv 3.1 for android what is " public...
View ArticleAlternative to CvAdaptiveSkinDetector
I read [here](http://stackoverflow.com/a/34250304/5465739) that CvFunctions are deprecated. I am trying to write...
View ArticleNeed a flag to shows an eye has been detected.Hi
Hi. I have a code that detect just open eyes and draws a circle around it, Now I need a variable like "A" that should works as a flag that means if an open eye has been detected it should be A=1, and...
View ArticleOpenCV 3 doxygen documentation still very counter intuitive
I would like to open up this topic to bundle together all possible suggestions that could improve the current doxygen documentation. I understand why the change has been made, but for now I find it...
View ArticleVehicle Side View, Cascade Classifier
Hello All, Please where could I find the cascade classifier xml for the side view of a car? Kindly advise the url. Also what other detector algorithm would be suitable to detect the side view of a...
View Article" mOpenCvCameraView.setOnTouchListener(MainActivity.this);" has error
" mOpenCvCameraView.setOnTouchListener(MainActivity.this);" has error How can i solve error? 
View ArticleRough outline for grocery shopping Android app
Given a library of 500 or 1000 pictures of items from a grocery store shelf, and the requirement to detect any of those items using an Android device's camera, what would be some logical ways to...
View ArticleDoes findContours create duplicates?
Hi, I'm considering a binary image from which I extract its edges using cv::Canny. Consequently, I perform cv::findContours, storing all the contours points coordinates in a > vector < vector...
View ArticleOpenCV Error: Assertion failed (prevPyr[level * lvlStep1].size() ==...
I am working on 2 images, on the first one i found goodFeaturesToTrack and draw it then on it, i am trying to to tracking with that to the second image but the line of calling calcOpticalFlowPyrLK...
View Articlestereo calibration issues
Hi! I'm currently working on a little robot with a stereo setup (made with 2 logitech C270, not the best, but still decent with 640x480 on linux) to detect obstacles indoor and create a 2D maps of the...
View ArticleMeasure shot distance for basketball and golf?
Let's say you're using OpenCV to do shot tracking for basketball and golf. For basketball, could you use OpenCV to estimate where on the court a shot was taken and the distance of the shot? For golf,...
View ArticleCan't find any faces on pictures
I'm java programmer and I'm using `opencv-2413.jar` library. ByteArrayOutputStream streamBA = new ByteArrayOutputStream(); //wi - is instance of WritableImage (images with faces are big: 720p and...
View ArticleHow to instanciate FaceRecognizer in Java
I want to use `org.opencv.contrib.FaceRecognizer` from `opencv-2413.jar`. How can I instanciate FaceRecognizer object? These do not work: FaceRecognizer rec = new FaceRecognizer(); FaceRecognizer rec...
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