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Questions tagged [pattern-recognition]

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Find all recurring subgraphs/patterns of maximal size in a single undirected, labeled, connected graph

I would like to identify all subgraphs of maximal size (maximum number of nodes) that are recurrent in a single undirected, labeled, connected graph. I provide exemples of input and expected output ...
Charly Empereur-mot's user avatar
0 votes
1 answer

Automatic classification of a family of 2D contours or closed surfaces in 3D

I am computing some partitions in my work and would like to be able to extract informations in an automatic way when given a certain partition structure. To see what I have in mind, look at the photos ...
Beni Bogosel's user avatar
  • 1,077
1 vote
1 answer

What is a good algorithm, and framework, to calculate centres of gravity or mass (cog)?

I'd like to take an photograph, subdivide it into a tesselation, either of squares, or (ideally), hexagons, and then find the centre of gravity (or, if you prefer, centre of mass) of each cell of the ...
Peter Brooks's user avatar
1 vote
2 answers

Automatic motion recognition

How difficult is it to program an automatic software using C that is able to read astronomy images of up to 4096x4096 pixels (or other sensor geometries), search ...
Lucas's user avatar
  • 111
1 vote
0 answers

How to choose (and many) threshold in Eigenface?

I edited my question trying to make it as short and precise. I am developing a prototype of a facial recognition system for my Graduation Project. I use Eigenface and my main source is the document ...
Delphius's user avatar
3 votes
1 answer

Curve detection in cloud of points

I have an array of 2D points and a known curve geometry (it consists of a straight line segment and a circle segment). The points might rotate slightly and are somewhat noisy. I need to find points in ...
Nikita B's user avatar
  • 133
0 votes
1 answer

How to detect smiles using OpenCV and IntraFace?

I have installed OpenCV and IntraFace, now the code can detect landmarks on the face, like this : Now how can I convert this to a smile detector? I have the landmark points as an array, so I should ...
jeff's user avatar
  • 121
3 votes
1 answer

How to detect specific behavior in time series?

I was not quite sure what the right SE for this was, so I posted this also here on DSP. Please tell me which one to remove :) Problem statement I have a few hundred unrelated time series, say $P_i(t)...
Rody Oldenhuis's user avatar
3 votes
1 answer

Recover curves from noisy collection of points

Background: I'm trying to make a system that tracks a number of bubbles in a video I'm implementing the bubble detection in the single image case using the Circular Hough Transform. Due to occlusion,...
Alex's user avatar
  • 31
3 votes
1 answer

Fitting a grid to an STM image

Suppose I have a scan from an STM image (very much like the things you see here). Suppose I have a simple square lattice with lattice parameter a. What I'd like to do is to numerically find the ...
Lagerbaer's user avatar
  • 487
8 votes
2 answers

Kolmogorov–Smirnov test for multivariate data

I have a set of files consisting of randomly selected points from a dataset, each file belonging to a particular class. Each row in these files contains the coordinates in n-space of the point. I'd ...
bab's user avatar
  • 181
12 votes
2 answers

Quickly finding rough lines in sets of points

In a particular class of detectors, our data comes out as pairs of points in two dimensions, and we want to string these points into lines. The data is noisy, and is binned in one direction but not ...
dmckee --- ex-moderator kitten's user avatar