OpenCV Q&A Forum - Latest question feed

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KNearest save problem

August 8, 2012, 5:15 am

I realized that knn.save() and knn.load() function is not implemented yet. I googled so much about that couldn't find any solution for that. If there is a solution i will be happy to know that. Any...

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Losing alpha channel when passing from Unity to OpenCV?

December 20, 2016, 11:01 am

Hello, I'm trying to develop an educational application using Unity3d and OpenCV (c++ Dll). My problem is that when I pass an image from unity encoded in PNG (in BGRA32 textureFromat) to OpenCV, if i...

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Some function is not recognize, opencv3

December 20, 2016, 7:32 pm

Dear everyone, I am using opencv3 in visual studio, I have successful in configure step. But some basic functions are not recognized as the attached image. ![image...

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Opencv row assignmement different values

December 20, 2016, 1:58 pm

I have this code in OpenCV: cv::Mat1f codes(x,y); ... for(int i=0; i

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how to generate random point

December 20, 2016, 4:03 pm

Dear community, I' have written this function to generate random value at each iteration in a for loop, however, it seems that it doesn't do the expected job Point initPt(int nx0, int ny0, int nx1,...

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3d reconstrcution from stereo cam

December 20, 2016, 2:32 pm

Hello, i have calibrated my stereo camera, now i have to build the 3d model but i can't find any example in opencv on howto do that . Please can you tell me first is opencv support to build3d and...

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OpenCV read the text file

December 21, 2016, 1:18 am

Hi I've installed OpenCV library Now I want to read a sentence by camera phone How can I enter the library a sentence to my Application?????? PLEASE HELP ME...

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Detect A4 sheet of paper for example at runtime on Android.

December 21, 2016, 4:03 am

Hello everyone! I am trying to automatically launch the android camera when I recognize a sheet of paper. I have tried some approaches such as color, templete, and geometry (rectangle), but none have...

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Opencv-Gimp Lightness

December 20, 2016, 12:57 pm

System information (version) OpenCV => 2.4.13 Operating System / Platform => Windows 64 Bit Compiler => Eclipse Neon Detailed description How to reduce lightness in java with Opencv? These...

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Delphi-OpenCv Face Detection Recognition

December 9, 2016, 1:07 pm

Face Detection and Recognition from Delphi OpenCv Delphi with MxAccess / Sqlite http://www.mediafire.com/file/xa15uo26ocpxciw/Delphi-OpenCv-FR-Test-Sample.zip I was crazy asking help for Delphi OpenCv,...

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Processing Camera stream in Opencv, pushing it over RTMP (NGINX RTMP Module)...

April 11, 2016, 3:48 am

Output video: https://youtu.be/VxfoBQjoY6E **Explanation:** I want to: Process camera stream in Opencv and push it over to RTMP server. I already have NGINX (RTMP module) set up and I have tested...

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OpenCV integrate in MCU

December 20, 2016, 9:41 pm

Hello All, I am embedded guy and have only experience in MCU (Not Linux based system). I am looking for the solution to port OpenCV in MCU (Minimum Sub-system, e.g. STM32F4). Please let me know what...

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Stereo Calibration RMS and epipolar error

December 21, 2016, 7:41 am

Hello, i have run the opencv stereo_calib simple for my images , the program found 8 pairs and show me : ...........8 pairs have been successfully detected. Running stereo calibration ... done with RMS...

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OpenCV C++11 Timeline

December 21, 2016, 9:28 am

I am working on a project that involves working with 3D images. I am using OpenCV because they have the best multidimensional matrix support. With that in mind, many of the functionality in OpenCV is...

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Runing stereo match simple

December 21, 2016, 1:19 pm

Hello, i have problem runing the opencv stereo_match simple i have type in the terminal the following commande ./stereo_match 0000L.png 0000R.png -i intrinsics.yml -e extrinsics.yml -p cloud.asc and...

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recoverpose

December 20, 2016, 6:40 pm

Just a simple question, in these two statements E = cv::findEssentialMat( points1, points2, focal, pp, cv::RANSAC, 0.999, 1.0, mask); cv::recoverPose(E, points1, points2, R, t, focal, pp, mask); Is...

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min max is not a member of std

December 16, 2016, 8:11 am

Hello, I'm having problems trying to decode h264 video from IP camera, after some search I found it's because ffmpeg, so I downloaded the latest ffmpeg, and tried to link it to openCV but it still...

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Is it possible to detect human body parts from images?

December 21, 2016, 9:37 pm

Is it possible to detect body parts such as head, shoulder, hand, leg, foot from a single image with OpenCV or other image processing libraries? ![Front](/upfiles/1482384910620848.png)...

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Real-Time video stitch (moving cameras)

December 21, 2016, 1:00 pm

Hi, I have just started to use openCV and I am very new to image/video processing and stitching so please bear with me while I explain what I am trying to accomplish. 1. I plan to purchase **3 HERO5...

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Deskew of image and ROI detection

December 21, 2016, 10:27 pm

In OMR, if scanned OMR is not in correct position then how can i deskew the image and search exact location of roll number rectangle?i want to extract information from different rectangle based on...

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