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Questions tagged [computer-vision]

Use this tag for questions related to Computer Vision -- any aspect of software that enables computers to perceive, understand and react to their environment using cameras. For questions related to image filtering and quantification, use the tag [image-processing] instead.

Computer vision enables images, or sequences of images, to be processed by a computer using algorithms. There are many aspects to computer vision, including mathematics, physics (especially optics), imaging hardware, , and .

Some basic techniques used in computer vision are:

  • Image acquisition
  • Pre-processing
  • Feature Extraction
  • Detection/Segmentation
  • High-Level processing
  • Decision making
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Opencv cascade train time

I use opencv_traincascade for training using following parameters opencv_traincascade -data cascade_model -vec ..\create_template\pos_vec_file -bg ..\BG\bg.txt -featureType LBP -w 32 -h 32 -numPos 5000 -numNeg 10000 I tried to give more memory 1024…
Alex Hoppus
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Platform Independent GigE Vision driver

Is there a platform independent GigE Vision driver or software package that exists? I am integrating a Point Grey Research Flea3 GigE camera with a Texas Instruments C6678 multi core DSP chip. I was hoping to find a piece of software that had…
Crake
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Object recognition and measuring size

I'd like to create a system for use in a factory to measure the size of the objects coming off the assembly line. The objects are slabs of stone, approximately rectangular, and I'd like the width and height. Each stone is photographed in the same…
Sam
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OpenCV saving video to file

I think my question is pretty basic, but I'm writing this code in OpenCV to simply capture video data from the webcam and save it to file. Now the problem is that the file gets made at the desired destination, it initially is about 286 bytes in…
yashc
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phaseCorrelate function in OpenCV Python

The phaseCorrelate seems to be an undocumented function of the OpenCV Python wrapper. The doc of the C++ function is here. When I call the function from Python I get the following error: cv2.error:…
b_m
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How to find this kind of geometry in images

Suppose I have an image of a scene as depicted above. A sort of a pole with a blob on it next to possibly similar objects with no blobs. How can I find the blob marked by the red circle (a binary image indicating which pixels belong to the…
Leo
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Getting stuck on Matlab's subplot mechanism for matching images' points for vlfeat

I am doing vlfeat in Matlab and I am following this question here. These below are my simple testing images: Left Image: Right Image: I did a simple test with 2 simple images here (the right image is just rotated version of the left), and I…
Karl
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OpenCV SVM throwing exception on train, "Bad argument (There is only a single class)"

I'm stuck on this one. I am trying to do some object classification through OpenCV feature 2d framework, but am running into troubles on training my SVM. I am able to extract vocabularies and cluster them using BowKMeansTrainer, but after I extract…
tuck
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Is it safe to do histogram comparison in this case?

As I don't know the limit of histogram comparison ,I decided to ask the wonderful community. I have some images and I want to group them according to its similarity.every image has a unique colored lines starting from the top down to the bottom of…
Someone Someoneelse
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Javascript Optical Flow Implementation

I'm looking for an optical flow implementation to run on my web app in html5 canvas, but didn't found something immediately usable. If I choose to implement it by myself, is it be possible to achieve (near) real-time performance? Or, since in the…
clwen
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Simple Image Recognition Task in Android: Dominoes Reading

I am newbie to the CV field and I am on a relatively simple task, I want to analyse dominoes rock values. I used blob analysis method, which wasn't really efficient on android for that I used a pure java code which tends to be slower than native C.…
Omar Alshaker
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3d reconstruction from calibrated camera images

I am working on 3d reconstruction. And now when I consider a pair of images. I have a set of corresponding points . and I have my camera details. For example I have focus details,Rotation and Translation matrix(4*4). and I want to project my points…
user1771732
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Classification of objects from a video ( human, animals, others(cars etc.,) )

Hi I am new to image processing field. My project is to classify the objects in an image/Video. The input is an image/video from surveillance camera. I should classify the objects into three classes. 1) Humans 2) Animals 3) Others (cars). We can…
2vision2
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Remove noise from a binary image

I want to get an image only with the grapes and the three circles (red, green, blue). [I need to remove all the smears]. how can I improve my code for that? this is my code: RGB = imread('img_3235.jpg'); GRAY = rgb2gray(RGB); threshold =…
Alon Shmiel
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Multiple-View Geometry

I've two images captured from two cameras of same make placed some distance apart, capturing the same scene. I want to calculate the real world rotation and translation among the two cameras. In order to achieve this, I first extracted the SIFT…
Aarambh
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