OpenCV Q&A Forum - RSS feed

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How to get bit depth of original jpg image

July 30, 2015, 9:08 am

I have 32 bit per pixle jpg image i used the following vode to read the image int Ret = 0; //read the input image Mat orgMat = cv::imread(strInputFile,CV_LOAD_IMAGE_UNCHANGED ); if( orgMat.empty() ) {...

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opencv import video error python

July 30, 2015, 8:56 am

Video can not be imported into the process. on windows ![image description](/upfiles/14382735412393985.png)

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Is grayscale image still required in CascadeClassifier::detectMultiScale?

July 30, 2015, 9:32 am

I noticed that both methods below are working with 'haarcascade_frontalface_alt.xml' dataset. In most tutorial samples they always convert the source frame into grayscale, so my questions is if the...

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how to detect whether tube is present of not??

July 15, 2015, 3:38 am

Hello, I want to detect that tube is in frame of not. currently I am using canny edge detection, but problem is how can i set edge for tube. So, I can get information that tube is there or not. ![as...

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Java API - Core.add() method not working!? How to add 2 Mats?

June 25, 2013, 11:15 am

When trying to add two Mat elements by using the Core.add() method, these are added only if src1 is an EXACT copy of src2 (or viceversa). As soon as I change the value of an element in one of them, the...

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For Windows and Visual Studio

July 30, 2015, 1:40 pm

Hi, Is OpenCV more easy to use with python ? Although there are a number of samples in .cpp I was looking for samples beyond installation guides. Also I would want to learn about web based techniques...

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How do I estimate camera pose from two sets of features in openCV?

July 30, 2015, 3:05 pm

I have a sequence of images. I would like to estimate the camera pose for each frame in my sequence. I have calculated features in each frame, and tracked them through the sequence. I would now like...

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OpenCV 3.0: How to determine which GPU is used for OpenCL?

May 26, 2015, 7:56 am

Hi, I ran the ufacedetect.cpp code from the sample folder, and it ran with ~10 FPS. This made me curious to learn: - Is it running on the Intel HD 2500 or the nVidia GT 710M in my laptop? So, how do I...

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rpm for opencv 2.4.*

July 31, 2015, 12:02 am

Is there any RPM available to install opencv 2.4.8 in Centos 6.3 ?. I tried to find it, but I couldn't find for opencv-2.4.8.

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cv::fitLine doesn't accept cv::Point inherited class

July 31, 2015, 12:28 am

Hi, everyone. I'm working on a project which has a 'MyPoint' class inherited from cv::Point. I just want to use cv::fitLine to process a std::vector< MyPoint >. But cv::fitLine simply can't...

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Problems run iOS

July 31, 2015, 1:50 am

Dear all, I am trying to include opencv in my iOS existing project. Before to do that I tried to install opencv in a new iOS project (I followed the tutorial) and all is working fine. Then I tried to...

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Is there any maximum size for SVM input vectors?

July 27, 2015, 8:06 am

Hello everyone, I'm facing some trouble while training an SVM and I'm wondering if it has to do with the size of each of the input vectors. As usually, I'm computing some descriptors to be passed into...

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Problem getting CUDA to work on OpenCV3 latest clone

July 31, 2015, 12:41 am

So I am trying to get the CUDA interface to work on OpenCV, when I got the following error from the second I am calling upon a cuda related function: OpenCV Error: Gpu API call (NCV Assertion Failed:...

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Xcode6.3.2 __cplusplus notdefine

June 9, 2015, 1:46 am

this is the error, in opencv2.framework/Headers/core.hpp line 49 ![image description](/upfiles/14338388909479532.png) my xcode build setting is ![image description](/upfiles/1433838986171338.png)...

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Message not marked as unread if the content is no longer available

July 31, 2015, 4:39 am

Hi, I have a problem on the account of this forum: I have a message that informs me about a comment on a question that I commented on, and if I click on `commented question` I get the info `Sorry,...

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Where can i find the steps to install lates version of openCV?

July 31, 2015, 2:56 am

I am using Ubuntu 14.04, I want to install the latest version of openCV with updated libraries and repositories. How can i accomplish this?

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imread doesn't open pbm/tiff images

July 31, 2015, 7:00 am

Hi, I have a code that works with low dynamic range images (like png, jpeg and other normal extensions), but it can't read pbm/tiff files. What can I do? cv::Mat img = cv::imread(argv[1],...

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Compile failed: cannot find -lRunTmChk

July 31, 2015, 7:15 am

Hello, I'm trying to compile OpenCV. I've followed the directions outlined here: http://docs.opencv.org/doc/tutorials/introduction/windows_install/windows_install.html#windows-installation and I'm...

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syphon input to Mat

July 31, 2015, 9:00 am

Hello! I was trying to find an example of how to access a syphon client from open cv. I couldn't find any code or something other than using openFrameworks for that.. If this is not something difficult...

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Simple algorithm for tracking objects between frames

July 31, 2015, 8:29 am

Hey all, I'm using contour finding (along with background subtraction) to pick out objects from a scene -- however, I'd like to also be able to track objects from frame to frame. Given two frames, I'd...

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