how to restore front view of inclined plane from 3 vector projections
I see some plane **P** in my image **I**(x,y),which has unknown angle with my image plane. In my image **I** I can extract 3 projections of vectors **a**, **b** ,**c**, all them are perpendicular to...
View Articledepression detection from facial emotions
Hi I have question about face emotion detection using android and opencv My aim is to detect depression from facial emotions, is that applicable using opencv ? and how accurate can be ? Thanks fo help
View ArticleDetect numbers and calculate it in box
I'm a beginer for OpenCV, currently I'm working on a project to detect the numbers in a box on the banknote bundle. The objective for machine vision is to count the amount of numbers printed in the...
View ArticleHow can i use opencv FloodFill with java?
I tried to use floodfill in my source code but the application doesn't work and this is my code : `final Bitmap bitmap = BitmapFactory.decodeFile(fileUri.getPath(),options); Mat tmp = new...
View ArticleAccessViolationException on detectMultiScale
hi i want use CascadeClassifier to detect face but when face_cascade.detectMultiScale execute in my code rise : AccessViolationException, this is my code : #include "stdafx.h" #include...
View Articleindex matrix
Hi, In my code I need to create a matrix filled with all the possible pixel coordinates of an image ( Mat ). ex.for a 1024x768 image: [ 0, 0] [ 0, 1] [ 0, 2] . . . [1024, 768] Is there a more...
View ArticleHow to Change image intensity range
Hi, I am working with image registration. I have gray-scale images (CV_8UC1). I have done the registration part. Now I want to check the alignment accuracy. I want to convert the intensity range to...
View ArticleIs lbp rotation invariant?
I want to use lbp as a feature extraction technique but the features that i extract should only be translation and scale invariant.it should not be rotation invariant
View ArticleKinect one stereo calibration and overlay rgb with depth map
Lastly I am working with the kinect one sensor, which comes with two sensors an RGB camera with resolution of 1920x1080 and an IR/Depth sensor with resolution 512x424. So far I managed to acquire the...
View ArticleTM_CCOEFF_NORMED for images with the same size
Hi There! I am using template matching with option TM_CCOEFF_NORMED to measure similarity between two image patches of the same size. It works nice however I cannot understand what it is actually...
View ArticledetectMultiScale return illogical result
i want use cascade classifier for face detection but illogical result occurred this is my code :#include "stdafx.h" #include "FaceDetection.h" using namespace cv; FaceDetection::FaceDetection(void) {...
View Articlehow can i use opencv to compare charaters in a picture and characters in a...
My project aims to extract letters from a picture taken with the mobile camera and compare them with letters in the database(pictures of letters ) and it should know each letter .For example if i tell...
View ArticleCan I "retrain" OpenCV detection .xml model which is ready?
About the ready detection model that offered by OpenCV, like lbpcascade_frontalface.xml and haarcascade_frontalface_default.xml, etc. I know I can use myself databases to train the new model. but... If...
View ArticleParameters of detectMultiScale using python
I am not able to understand the parameters passed to detectMultiScale. I know that the general syntax is detectMultiScale(image, rejectLevels, levelWeights) However, what do the parameters...
View ArticleOpenCV on Windows 10 with NetBeans IDE 8.1 not working
I have installed the latest version of OpenCV. Now I'm trying to configure NetBeans to use it. I put ../../../../../opencv/build/include in the C++ compiler and in the Linker...
View ArticleHow does it work OpenCV Mser for color images?
I am using OpenCV Mser class. For grayscale images I don't have any problems, reults are good and parameters defined in documentation influences to algorithm logically : - delta - it compares...
View ArticleChain Code Histogram
I have already extracted chain code of the contour, calculated the number of occurence of each code. Then calculated the frequency of each code. Now I have to plot it in a histogram, I do not know how...
View ArticleTrouble with OpenCV Implementation of EM Algorithm using Spherical GMM
Hi I've been trying to use the OpenCV EM code and have had a problem. By setting the maxiter parameter to 1 and using the trainE function I allow only the first expectation step to be completed. I...
View ArticleWhich single board computer should I chose?
Hi opencv community I' m working with opencv to make a robot which can go itself with image proccessing. I am using lots of hardware in this project and I used pcduino V3 until this time. But I want to...
View ArticleDifference between Point and Point2f
Hello I am new to opencv and I want to understand the difference of use of Point and Point2f .Can anyone please explain that and also give an example ?
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