Detection Parameters in OpenCV 4 Android
Dear All I am working on a project to recognize logos using locals detectors and descriptors by opencv4android(Java). In the case of OpencCV for windows the detection methods incorporate numerous...
View ArticleCan't see the captured images when I used Black Magic Design "DeckLink Mini...
Hi, I bought DeckLink Mini Recorders to capture images, but there were problems. What sholud I do? Please advise ASAP. ----------------------- ・The thing I want to do - To capture 4 HD movies by using...
View Articletraning the data using dataset?
hello, how to train data using given dataset ?? i have dataset of many images.....
View Articledetecting cirlcles and verifying it
Hi,after detecting circles with houghcircle ,i need to verify if all circles (wanted to be detected) is detected as a first solution is to add reference image which contained all circles must be...
View ArticleFaster than simple blob detector?
Capturing from a webcam and using the simple blob detector to find a blob of white pixels - I use threshold to make a binary image that should contain just the single blob I need, and I only need it's...
View ArticleReal time pedestrian detection
i have found a code about **real time pedestrian detection** and i think it's results seem better than OpenCV's HOGDescriptor. i have already made simple improvements on the original code and want to...
View ArticleHow many images for good face recognition
I can't find a good answer for this. Currently, my own experiments tell me i need at least 500+ images (currently i'm even thinking 1000 images) to get *reliable* face recognition, with lots of...
View ArticleImage classification using SVM
i'm using opencv svm and i want to know if it is possible to know which image is closer to our input image instead of the class which belongs our image.
View Articlehow can I find the mathematical principal of the opencv function stereoRectify()
I know how to use the function `stereoRectify()`, but I also want know that how it works. I know, of course, that I can learn about this by reading the code, beacuse opencv is opensource. but I am not...
View ArticleLogistic Regression on MNIST dataset
In [this](https://www.simplicity.be/article/recognizing-handwritten-digits) post you can find a very good tutorial on how to apply SVM classifier to MNIST dataset. I was wondering if I could use...
View ArticleORB/BruteForce-drawing matches when there are none
I'm trying to write a program that uses ORB algorithm to detect and compute the keypoints of an image and a video and matches descriptor vectors using BruteForce matcher. The issue I am facing is,...
View ArticleWhat is the intended result of ChArUco diamond detection?
I've recently gotten into using the ArUco module in OpenCV 3.1 in order to do pose estimation for a project I'm working on. However, in the course of attempting to estimate pose and draw an axis, the...
View ArticleHow to calculate the distance between the camera from the computer and any...
I want to use the camera from my notebook to try to find the distance that I'm an object, but can not find anything and also I'm just starting in the programming area so I apologize for the ignorance.
View ArticlefindContours Function causes crash across Windows & Ubuntu
When I use the OpenCV function findContours() my c++ application crashes. I've reproduced the error on both Windows 8.1 and Ubuntu. I've run into this crash before with the same function in my other...
View ArticleUbuntu 16.04 X86_64, -DWITH_QT=ON, OpenCV 3.1.0
Using Ubuntu 16.04 X86_64 Desktop -DWITH_QT=ON and I get the errors below. -DWITH_QT=OFF and OpenCV and contrib build fine. uname -a 4.4.0-22-generic #39-Ubuntu SMP Thu May 5 16:53:32 UTC 2016 x86_64...
View ArticleHow access to UMat pixel by pixel without getMat?
Hi to everyone! I want to ask how I can access to UMat information pixel by pixel without using getMat. Thanks!
View Articleshow an image in image view on top of camera preview
I have a camera preview in a RelativeLayout, in that layout i put an image view, when i add an image to the image view it does not show, only the camera preview is showing. this is the xml: Thanks!
View ArticleDisable dictionary in tesseract
How do I disable dictionaries to increase recognition while using tesseract ocr with OpenCV in C++ ? I have read: Disabling the dictionaries Tesseract uses should increase recognition if most of your...
View ArticleImage recognition app
Hello, For my bachelor thesis I have to make an app that recognize logos, eg : I see the logo of a car and I want to find out what car it is. I take a picture of the car’s logo and the app should...
View Articlecascade classifier takes hours in testing one image
I am trying to train a cascade classifier with matlab and c++. I am trying to detect optic disc in retinal fundus images. number for positive samples i have used are around 12000(after flipping) and...
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