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Questions tagged [object-recognition]

The computer vision task of finding and identifying objects in an image or video sequence

The computer vision task of finding and identifying objects in an image or video sequence is often conducted consistent with one of two approaches:

  • Appearance-based methods

    • Use example images (called templates or exemplars) of the objects to perform recognition

    • Objects look different under varying conditions:

  • Feature-based method

    • a search is used to find feasible matches between object features and image features.

    • the primary constraint is that a single position of the object must account for all of the feasible matches.

http://en.wikipedia.org/wiki/Outline_of_object_recognition

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how to detect staircase using open cv python?

I am presently working on a project based on blind man navigation. I need to detect staircases for that project. Can anyone help with the solution.
nik
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How am I able to speed up the sliding window in Matlab for an operational object recognition?

I'm working on a high resolution data set for extracting desired image objects. To do this, I have applied HOG + SVM. Although the results I get are very promising and operationally accepted, the speed of this task is annoying! For each image, which…
Federico
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Rotation of a detected rectangle in an image

I need to extract a detected rectangle from an image. Rectangles are rotated in arbitrary degrees which are unknown. I have seen this post: How to straighten a rotated rectangle But there are two problems: How to calculate 'theta', which is…
Danial
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Recognize hand drawn shape in OpenCV

I have the following task: recognize a set of simple hand-drawn shapes on a sheet of paper from a still image (not a video stream), so they might not be exactly identically pixelwise. Those shapes are basically symbols for doors, windows, etc. in a…
Paul Latzelsperger
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opencv - Detecting multiple rectangles of the same color and getting their coordinates

I need to detect the white rectangles and get their coordinates on an camera input like this: i've been reading and i think i need to put a hsv filter and then apply threshold to the input. but then, for the tracking part i read about three…
angel208
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Difficult time trying to do shape recognition for 3D objects

I am trying to make a shape recognition classifier in which if you give an individual picture of an object (from a scene), it would be able to classify (after machine learning) the shape of an object (cylinder, cube, sphere, etc). Original…
user3377126
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How to obtain part scores and bbox coordinates (or centroid) for detected object using Discriminatively Trained Part Based Model

I have a same question asked at (How to obtain part scores in Object Detection with Discriminatively Trained Part Based Models) Though, I almost copied the same question here as well. I am using the code available at…
student
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Recognize Patterns of images JPG or PNG

Hello friend I want to recognize and determine the type of object into photo jpg or png with php, for example determine if exists a apple or grapes, or car, or animals into any photo. Please if somebody know about that, because I want to make…
Gildus
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Android OpenCV Paper Sheet detection

I think this question is asked before but i didnt find a sample or solution for my problem. I am new to opencv and i want to use the OpenCV CameraPreview for paper sheet detection. In my sample app i use opencv 3.0.0 with static initialization. I…
Zenco
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Counting the number of medium-sized buttons on the image using Matlab

I tried to select borders and then calculate the area. Вut I'm having some difficulty with this. Here's my original image. After after some processing of the original image I obtained this image: Here's my code: clear; …
Aaleksa
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OpenCV HaarCascade Training for Flowers

I have decided to train Haar classifier for 102 flower categories given here:(The dataset) http://www.robots.ox.ac.uk/~vgg/data/flowers/102/categories.html In the link you can see several categories. I am posting a few images of an individual flower…
Manish Kumar Sharma
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MOG2 background subtraction Parameters

I am trying to use the OpenCVs Background Subtractor class MOG2 to seperate a person moving infront of a camera. I got everything set up and working nicely. But the resulting mask I am getting looks something like this: (default settings) Now what…
Foaly
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Viewpoint invariant detection and recognition of simple 3d objects from image

I have a set of simple rigid 3D objects that I wish to detect and recognize from an image (let's say 5 to 10 classes). The objects are simple in sense that they are cylinders in one color or rectangles with simple patterns (stripes for example) or…
Damjan Dakic
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Two bag-of-words classifiers, Matlab

I'm trying to implement "Two bag-of-words classifiers", so I found resources at this website. http://people.csail.mit.edu/fergus/iccv2005/bagwords.html This website provides complete files including Matlab code. But I've encountered some errors…
Willie
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Bad trained cascade in OpenCV

I can't train the classifier properly.. When I use the generated cascade.xml the object is not recognized. Instead some parts of the object are. The command line for training is this: opencv_traincascade -data data -vec samples.vec -bg negatives.txt…
dephinera
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