Correct the image's borders illumination
I'm developing an algorithm to stich images of vines. These images were taken at night with artificial illumination, because of this, the image's center is very well illuminated but their borders are...
View ArticleVideoReader_GPU not available, but built with NVCUVID?
I've built OpenCV 2.4.8 with CUDA 5.5 using Visual studio 2012. Building code to use it seems to work too. gpu::getCudaEnabledDeviceCount() reports 1. However, when I try to initialize a...
View Articlecv2.imread returns None
as the title states, when I do im = cv2.imread("path\to\image.jpg") and I've made sure the image is there, I get None in `im` I've imported cv2, and can't think of why this is happening. (Python 2.7,...
View ArticleRotation angle of a given affine transformation matrix
I'm developing an image stitching algorithm and I'm using affine transformations. One part of the algorithm is to detect whether an affine transform is garbage. To do this, I want to calculate the...
View ArticleHow can I use the second argument of sift.detectAndCompute() ?
Hi, I'm using SIFT algorithm for comparing the features between two images. I'm curious to know about the second argument of sift.detectAndCompute() method. I'm using none in my script. I know the...
View ArticleHow to change BGR to RGB of a video frame using C /C++
Webcam feed reads as a inverted RGB and so the rendered colors are incorrect. I need to change BGR to RGB. Below shows incomplete code of trying to achieve the end result. Can someone guide me through...
View ArticleDetach blobs with a contact point
Hello. I'm working with blob analysis and i'm having problems on detaching 2 blobs which have a contact point. The images i'm working on are of this type:  Here if car comes and parks over parking slot the circle turns red and available if green please give me topics that i have to study and steps to...
View ArticleSubract one mat from another if a condition is met
I have 2 matrices of the same size. One of which has a "black area" where all the values are Scalar(0,0,0). I want to subtract the other matrix from this one but only in places where it isn't black (I...
View ArticleHow to detect and recognize objects in an image?
The idea is to detect objects in an image. Say, i have a book in a image and i would like to detect it. I read about the SURF algorithm but i don't think it would be applicable in my project. The...
View ArticleHow to extract feature indexes from CvBoost
Hi All, I am learning a boosted tree from 30000 randomly generated features. The learning is limited to only say the best 100 features. After learning how do I extract from the CvBoost object, the...
View Articlecolor dense optical flow
Hi, I have developed an OpenCV program to compute the disparities of the image using StereoSGBM and I got the output in grayscale, so is there any idea how to get output in color scale using the same...
View Articlephase correlation for image registration(image stitching)
I'm trying to stitch 2 images using cross correlation (phase correlation).Images are the same size.Only shift is present. I tried opencv with cvDFT and opencv+FFTW it seems to work, but for some reason...
View ArticleVideoCapture get, set FPS property for camera on Windows
Hi, I am using OpenCV(3.0.0) on Windows 7 with a USB camera. I need to get and set the fps of the connected camera but `CV_CAP_PROP_FPS` does not seem to work for my camera. Now I know that we cannot...
View ArticleWhich Essential Matrix to choose from the 10 solutions of five-point algorithm?
The five-point algorithm returns 10 solutions for the Essential matrix. Which matrix to choose among the 10 solutions and resolve the ambiguity? What is the criteria on which matrix to choose from the...
View ArticleIssue when write yaml file (C++)
the content of the yaml file I hope is AAA： - BBB: a: 1 b: 2 the code I write is like FileStorage fw("./config.yaml", FileStorage::WRITE); fw << "AAA" << "[" << "{"; fw << "BBB"...
View ArticleI want to multiply a matrix with a number !
I am using opencv in android studio. i want: Mat A; Mat B; int num= 255; B = A*255; But it is not working.
View ArticleIs stitching module able to stitch images taken from a parallel motion camera ?
Hi, I was wondering if the stitching module is able to stitch the images taken from a camera that is in parallel motion to the plane which is being photographed ? I know that generally all the...
View ArticleLinking OpenCV 2.4.2 with Visual Studio 2012
Hello, i'm very newbie in OpenCV and Visual Studio I am working with windows 7, 64-bit, and I used VS2012 How to configure it? I've been using the tutorial from [link...
View ArticleDetect tilted face
Hi I am trying to detect the tilted face using `Opencv4android`. I have run `face-detection-sample`, I have noticed that when face is straight, its detected but when the face is right/left tilted or...
View Article