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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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Logo detection/recognition in natural images

Given a logo image as a reference image, how to detect/recognize it in a cluttered natural image? The logo may be quite small in the image, it can appear in clothes, hats, shoes, background wall etc. I have tried SIFT feature for matching without…
Fiong
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Find outer checkerboard corners

In the below picture, I have the 2D locations of the green points and I want to calculate the locations of the red points, or, as an intermediate step, I want to calculate the locations of the blue points. All in 2D. Of course, I do not only want…
Daniel S.
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Detect road surface in a traffic scene point cloud

I want to analyze a traffic scene. My source data is a point cloud like this one (see images at the bottom of that post). I want to be able to detect objects that are on the road (cars, cyclists etc.). So first of all I need know where the road…
Kozuch
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Image classification: recognizing various features of many buildings from images

So, let's say I have the longitude/latitude or address of many buildings I can get satellite images, "street view", and perhaps 3d/perspective views of buildings. I want to find the: height, number of floors, floor area (max building footprint) of…
Neil McGuigan
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Big differences in image filtered with rotated Gabor kernels

I have calculated 8 Gabor filters with Theta rotation m*PI/8. Parameters of the Gabor kernel given as input to OpenCv cv2.getGaborKernel: ksize = 11, theta = m*PI/8 lambd = 16/3 sigma = (5.09030 * 8.0) / (3.0 * PI) gamma = 0.5890 psi =…
alessandro.ferrari
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could not calculate the dimensions after pooling and subsampling in the famous Convolutional neural nets example

The above image is from a pdf by Yann LeCun, titled "Hierarchical Models Of Perception and Reasoning" I am not able to understand the how the layer 2 is 14X14 feature maps? How can 75X75 matrix with 10X10 pooling and 5X5 subsampling gives 14X14…
Abhishek
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Reading CIFAR10 data with java

I am working on a Machine Learning project with the CIFAR10 dataset and I am looking for the fastest way to process the data using Java. It consists of 60,000 32x32 color images. The images are in png format. I want to store the image as raw pixels…
gstvolvr
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How to plot a room outline from range finder sensors in a toy car?

I have a toy car that has an arduino and 4 Ultrasonic Range Finder sensors in front, rear and both sides, they give me the distance to a wall if any exist within the range that the sensor covers, the sensors give me this data in short intervals, the…
SteveBash
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Which object recognition algorithm should I use?

I am pretty new to CV, so forgive my stupid questions... What I want to do: I want to recognize a RC plane in live video (for now its only a recorded video). What I have done so far: Differences between frames Convert it to grey scale GaussianBlur…
user2175762
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Detecting windows in openCV

I am trying to detect windows (real-life-house-windows). Using corner detection is not always enough. So I am trying to figure out a pattern to recognize windows.. I thought that also detecting the light difference (sun coming from the window) may…
frankish
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How to recognize UI elements in image?

I am trying to make an automator tool and am experimenting with a type of recording which takes screen shots and records user inputs. The idea would be for user to take a snapshot and and highlight a square on the snapshot of the "submit" button.…
user1625624
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Accumulating votes in MATLAB

First, a little background to my problem: I am building an object recognition system using a geometric hashing technique. My hash table is indexed by the affine co-ordinates of points in a model determined by a basis triplet (allowing an affine…
Chris
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locating a moved object without using keypoints

I am trying to determine the movement and rotation of an object (can be plain-colored, but does not have to be) on a not completely constant background. Here is an example: Using keypoints to find the transformation as in the tutorials does not…
Tobias Hermann
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Object Recognition with SIFT Features

I am working on simple object recogniton of 3 types of objects namely: 1. Book 2. Cups 3. Balls I have training image of 50 for each samples and a test image of 20 for each samples. All my pocessing and classification is performed very well and…
rish
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Combining Sift descriptors of 5 images

I want to combine the descriptors of 5 images of the same object into a single descriptor file, so that I can recognize the object in any of the views of the reference images. I need to eliminate repetition of similar descriptors from getting saved…
user2179544
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