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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 obtain part scores in Object Detection with Discriminatively Trained Part Based Models

The code which is available at http://www.cs.berkeley.edu/~rbg/latent/voc-release5.tgz is widely used in object detection. There is a imgdetect function which returns ds, bs and trees. It seems ds contains detection boxes and bs contains which of…
Bharat
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How to count near circular objects in image

I have a image similar to below. In that I need to find all red circles and count them. So, I am thinking to use MATLAB R2011a with Image Processing Toolkit for it. How could I possibly extract them?
Iamcool
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Open source object recognition library for visual browsing interfaces

Are there any image analysis or object recognition libraries that would be suitable for use in browser emulation? Eg: automation of user logins, filling forms, extracting data from tables, etc. I understand that HTML parsers are more commonly used…
Edan
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How to detect darts on a dart board using Computer Vision in OpenCV?

I'm a newbie to the world of Computer Vision. Here's what I need to do. Given an image, pick out and draw a circle around all the locations in the image which contain an object A. In other words, say there are 3 darts on a shooting board and I want…
Cricketer
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From confusion matrix to ROC graph

i recently implemented a Bag of Words categorization algorithm based on the one described in this paper. All works well, but i'd like to measure accuracies of the classifiers using ROC curves or, perhaps, precision-recall graphs. I can easily get…
user996922
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Improving the performance of SURF on small images

Every implementation of SURF I have come across on the web seems to be particularly bad at extracting a useful number of interest points from small images (say, 100x100 or less). I have tried a number of approaches: 1) Using various upscaling…
Ben Englert
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Object recognition with android using OpenCV library

Possible Duplicate: Where do I start learning about image processing and object recognition? Is there any best way for implemeting Object Recognition in android? I tried to implement object recognition(Face tracking) in my project using OpenCV…
veera
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Object recognition with Kinect

I'm trying to recognize rectangular boxes using Kinect, I know I can use OpenCV or PCL to do this but my C++ is a bit rusty, I'm new to Computer Vision in 3D and I want to do it as quick as possible, it's only a demo for a bigger project. Is there…
user1860045
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Classifying a Distribution of Points for Object Identification

I have some points that I need to classify. Given the collection of these points, I need to say which other (known) distribution they match best. For example, given the points in the top left distribution, my algorithm would have to say whether…
hjweide
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Criteria to consider when evaluating interest point detectors

I want to evaluate different interest point detectors like FAST, MSER, DOH and DOG for images of certain kinds of objects. As a first criterion I came up with repeatability under certain conditions like lighting or scale. I think it is also…
Hans Sperker
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LSH and ORB opencv?

Basically I have many objects that i would recognize in a test image (query image) using ORB descriptors. I would like to use LSH to get faster matching but I can't find examples in opencv. Is it developed ? What do you use if you have differenet…
dynamic
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hierarchical k-means clustering for SIFT vectors

All I am searching for applying the same approach of David Nister and Henrik Stewenius in http://www.wisdom.weizmann.ac.il/~bagon/CVspring07/files/scalable.pdf In this paper, they use a high number of SIFT vectors (128-D) as input to a hierarchical…
zhenxingDCU
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Detection of pattern of circles using opencv

I have to detect the pattern of 6 circles using opencv. I have detected the circles and their centroids by using thresholding and contour function in opencv. Now I have to define the relation between these circles in a way that should be invariant…
shan
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Kinect object recognition

I am working on a Kinect project that needs to recognizes flat surface and small objects. I am planning to use openni on a mac machine. So what libraries do I need to used for object recognition? What knowledges do I have to know to finish this…
xinghua
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Scripting objects in greyscale images as zero-one array[]

I am trying to script a greyscale object in a captured image as a matrix of 0 1 that represents a block of object pixels (or something like object style scaling), i can imagine the manual processing by looping the object, scaling and writing the…
Alaa Alweish
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