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Questions tagged [pattern-recognition]

Pattern recognition is the term given to the science of automating the classification of input into pre-determined categories, or on the other hand, of being able to recognise particular categories of input by their characteristics.

Pattern recognition is the assignment of a label to a given input value. It is a kind of classification task, such that an input is classified to pre-trained class. Pattern recognition is studied in many fields, including psychology, psychiatry, ethology, cognitive science, traffic flow and computer science.

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Different accuracy for HOG, SIFT and DENSE SIFT descriptor for recognition

Heyy guys,, I'm really confused about the result that I got for the recognition. When I was using HOG, I got different accuracy for recognition (Based on he parameter im using). I can understand this things. May be, it's because I have dfferent…
user3507478
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How to calculate False Accept and Reject Rates in pattern recognition

I am working on a vein pattern recognition project based on SURF algorithm and euclidean distance. I have completed my program to find the maximum and minimum distance between vein features and find a match exactly when there is an identical image.…
Srikkanth Govindaraajan
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Parameter settings for neural networks based classification using Matlab

Recently, I am trying to using Matlab build-in neural networks toolbox to accomplish my classification problem. However, I have some questions about the parameter settings. a. The number of neurons in the hidden layer: The example on this page…
Samo Jerom
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Cascade/Linear Combination of Kernel Functions

I have a question regarding machine learning and specifically kernel functions. Suppose we have a Kernel function, say K(x), and also another distinct one, say K'(x). I want to know is K(K'(x)) a kernel function as well? That is, if one feeds the…
Saeed
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Data analysis (chart)

How to recognize start-point and end-point if data looks like at picture. I want to recognize that wave at axis Z(blue) 50-125 has start at 50 and end at 125. Axis Y (green) wave starts at 125 and ends at 175. I cant use method when it simply does…
SpeedEX505
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How can I find the robot soccer field feature's like L and T?

I want to find the humanoid RoboCup soccer field features like corner lines that have a shape like"L" and the corners of field's center line, that have shape like"T". Which method and algorithm is good for thit? Is there any article's about it?
user3305284
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Relationship between Perceptrol algorithm and MLP (Multiplayer perceptrol neutral network)

recently I started learning pattern recognition and I'm very interested in Perceptron algorithm. But sometimes I heard other students talking about Perceptron network, that is a type of neutral networks. What is the relation ship between them?
lenhhoxung
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Simple pattern recognition from paper: knowledge test

I want to make an app for test validation (on paper) with the camera (ex. android). Accordingly, I need to recognize filled response options on a paper, which I will do in advance. Prompt, where to start? Where to dig? I know of the existence of…
user2107749
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heterogeneous class recognition with ANN / MLP

I have put together a classifying 3 layer artificial neural network that appears to work on other datasets. Playing around some artificial datasets that I made, I was unable to correctly predict between two classes when one class was positive in one…
user2368936
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String meaning recognition / pattern recognition

Does anybody know if there is some library which can solve this problem: I have set of strings, for example screen resolutions with some text around it: 1024x768 1920x1080 (FullHD) 2560×1600 (Retina) ... then I get another string like 800x600 or…
user2545521
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How to use blockproc to process block data for feature extraction

I am using blockproc for splitting the image into 10x10 overlapping image blocks and I want to extract features of these blocks, but Matlab is giving errors. The code for the task is pasted here. The Matlab error is Error in ==> blockproc at…
Dr. Arslan
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Feature Extraction from an audio file using python

I am writing a chord-recognizer for a school project. I have to extract features from an mp3 file and use SVM with chord labels. How can I extract frequencies from an audio file. Is there any scipy package which could get me beat synchronous…
Ada Xu
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svmtrain returns a single floating value instead of a structure after training

I am using LIBSVM SVR for prediction in MATLAB. The output of svmtrain is supposed to be a model which is in this case should be a structure. But sometimes it returns just a single value. Can someone tell me what that mean. Below is one such data…
ChanChow
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Detecting a pattern of dark/bright bands in an image

I'm trying to detect a pattern like this in some images The actual image looks something like this It could be scaled and/or rotated. Is there a way to do that efficiently without resorting to neural nets or some learning algorithm? Can some…
Mohamed Tarek
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Hidden Nodes from neural network classifier in PRTools

I am using PRtools back-propagation based feed forward neural network classifier (e.g.[W, HIST]=bpxnc(Dataset,5,inf,[])). I am trying to figure out if we can specify how many nodes each layer has or if there is a way to specify the number of nodes…
Sabin
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