Sugestion of Machine Learning
Hello everyone, I have a dataset assembled by pairs formed by two float numbers, like (-87.884599 , 45.453324). I need to build a regression model to predict the second value for a single input. Can...
View ArticleHow to evaluate light linearity and additivity with a camera
Hi, lastly I am questioning the linearity and additivity of light propagation in images. As the title says I would like to see what is the contribution of light to image pixel intensity values and if...
View Articleunable to install opencv3
I am trying to install opencv3 with cmake using the [tutorials using python](http://opencv-python-tutroals.readthedocs.io/en/latest/py_tutorials/py_setup/py_setup_in_windows/py_setup_in_windows.html)...
View ArticleWatershed not segmenting correctly
Hi, I am trying to implement a watershed segmentation to separate touching blobs. I want to separate the blobs from each other but I am getting a separation of the blobs from each other **and** from...
View Articlehow to draw a detection line
hi to all , im from spain and im working on my final project in the university. im tryng to code a people detector or car detector. i have coded and i have things working in python using rpi3 and...
View ArticleHaar cascade training
Hello, I want to use a haar cascade classifier to detect objects in a image. I have 18 positive images and 24 negative images. Their size is 50 x 30. With them, I used this command to generate 1500...
View ArticleGet mean coordinates of active pixels
I would like to retrieve the mean coordinates of pixels in a binary image/mat which are not 0. Is there an existing way of doing this in OpenCV? Regards, Rupert
View ArticleHow to detect black dots inside largest Rectangle Contour?
 I can detect largest contour the answer sheet (20 questions, each have 4 alternative) After the draw largest contour, what shall I do? Divide matris...
View ArticleVideo capture of multiple cameras
I need to work on a requirement that needs reading multiple camera (around 20 cameras) feeds using multi threading. - Is there any limitation on number of cameras that can be used? - are there any...
View ArticleSVM doesn't give a Class as a result
Hi again, I am having some problems with SVM classifier. I want to classify "histograms" of Bag of words, ORB feature descriptors. I define the SVM type as follow: svm = SVM.create (); svm.setType...
View ArticleWorking with regions in opencv?
Hello, currently I’m in the training phase of opencv. I have previously worked with another image processing-library. In that library you were working with regions. This brings an extreme time...
View ArticlePoint2F assign problem
hi there, as I know if I want to assign some number to the mat I would type Mat C = (Mat_(3,3) << 0, -1, 0, -1, 5, -1, 0, -1, 0); just like the document. but now i want to assign some number to...
View ArticleHow can I add decision threshold to KNN classifier?
I am using the KNN classifier with BoW descriptor histograms. I would like to find a threshold between the matches. So that if the value is higher than a threshold consider that the classification has...
View ArticleStereo calibration fails
I am trying to properly calibrate a multi-stereo system. For this, I need to first calibrate camera intrinsic parameters, then the stereo extrinsic parameters for each pair, then the extrinsics between...
View ArticleBoost custom weak classifiers
Hello, I am trying to implement my own weak classifiers in connection with AdaBoost. Currently I am unable to figure out any way using cv::ml:boost. Am I missing something or does this algorithm...
View ArticleHow to use Opencv 3 particle filter api
I have built the opencv_contirb for opencv 3.1, and I got the tracking module. The document : http://docs.opencv.org/trunk/dc/d75/classcv_1_1TrackerSamplerAlgorithm.html#gsc.tab=0 The 3.0 doc also...
View ArticleProblem with SIFT Image Matching
hi guys i am working on vehicle type detection(for example detect BMW) uses Sift algorithm and OPENCV (my thesis is research about vehicle type detection by sift algorithm) i uses image matching and i...
View ArticleFind the corners of an object wooden plank
I want to find the corners of the image attached. I tried finding the canny edges to make it easier as I was only left with the plank edges but Im not sure this is the best approach.( maybe drawing...
View ArticleOpencv java web service
Hello, I need to process an image on server side using a restful web service. I'm trying to use Jersey framework but when I use some OpenCV operation i get an error. Something like this:...
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