The pattern-recognition tag has no wiki summary.
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23 views
How can I distinguish between two different users, thereby reducing their identites to a signature
How can I distinguish between two different users, like
two neighbours, who goes to the same place, but at different times..For example, both the neighbours unfortunatley works in the same office, but ...
1
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0answers
32 views
Patterns in binary sequences
I have data that looks like this:
011100111110100111
111111111111110010
111100001111000011
1D lanes of streams of data. Each row signifies the presence of a ...
8
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3answers
144 views
Detecting clusters in a binary sequence
I have a binary sequence such as 11111011011110101100000000000100101011011111101111100000000000011010100000010000000011101111
Where clusters of mostly 1's are ...
0
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0answers
23 views
How can you reconstruct “base” (profile/headshot) image of face using several obscured images of the face?
I recently read a paper titled "3D Face Reconstruction from a Single Image using a Single Reference Face Shape" which got me thinking about the fact that it is rare for one to encounter unobscured ...
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0answers
48 views
Pattern Recognition Problem
guys i have following questions,suppose we have following chart,which represents relationship between faculties and types of objects,for example CTE represents computer Technologies and ...
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0answers
42 views
Image similarity database
I'll preface this by stating I'm very new to computer vision. I took a Stanford Machine Learning course on Coursera, and that is the extent of my experience. I'm working on a free-time project to ...
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0answers
40 views
Question on Precision and Recall
Is it possible to have both Precision and Recall to be equal to 1.
If such a case may exist, does it mean the system is over-fitting the dataset?
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0answers
19 views
question on presenting multiclass classification results [duplicate]
I'm trying to figure out how to present results (e.g. precision, recall, accuracy, ROC curve) for a class project.
I have a multi-class classification problem(specific classification algorithm not ...
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5answers
178 views
What machine learning algorithm solves this problem?
I want to solve this classification problem. Basically what I have is a sequence of feature vectors $\mathbf{x}_1,\mathbf{x}_2,\dots,\mathbf{x}_N$, and each feature vector is sequential in time. I ...
2
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1answer
83 views
Confusion related to Kalman filters density view
I was reading this book related to Kalman filters and I didn't understand a couple of things. I have also attached the screenshot of the pages from the book where I had confusion.
The book is ...
7
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1answer
215 views
Confusion related to linear dynamic systems
I was reading this book Pattern Recognition and Machine Learning by Bishop. I had a confusion related to a derivation of the linear dynamical system. In LDS we assume the latent variables to be ...
0
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1answer
88 views
Suggestion for matlab Statistical Pattern recognition toolbox?
I am looking for a pattern recognition toolbox in matlab capable of doing well and have enough number of possible routines. What can be good candidate?
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0answers
74 views
Extract the pattern of the time-series dataset through moving average
I have both time series data and moving average data for the same data-set and the same time interval. I would like to extract the overlapping points. I would like extract those points where the ...
1
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1answer
82 views
Suitable data preprocessing for an image recognition task: normalization ,standardization or neither?
I aim to train my classifier for an image recognition task. What kind of preprocessing steps I need to take to enhance my results? (I have >40000 images with >700 pixels so large amounts of data with ...
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0answers
55 views
What are temporal conditional random fields
I've been reading about Conditional Random Fields lately. I'm trying my best to understand. However, when I read other research paper, many authors refer to "Temporal Conditional Random Fields".
I ...
1
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1answer
75 views
How does the test error pattern depend on the regularizer function?
This question is regarding the role of regularizer in an objective function.
Given a loss function $f(x)$, a regularizer function $r(x)$, and $\lambda$ being a trade-off function, our aim is to ...
2
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2answers
135 views
The most common extracted features for image recognition
I want to build a neural network, but because I have high resolution pictures, I rejected the idea of passing the entire image to the NN.
I was wondering what are the most common extracted features ...
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0answers
39 views
Sequence mining in univariate discrete data using R [duplicate]
Possible Duplicate:
r sequence recognition for univariate data sequence mining arules
I am looking for a method to detect sequences within univariate discrete data without specifying the ...
8
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1answer
168 views
How to measure the number of people in a picture of a crowd?
Background: Israel (and the middle east in general) is filled with protests.
I am curious, when given a picture, to estimate how many people are in that picture (often a picture of a large crowd).
...
2
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2answers
287 views
ROC vs Accuracy
I've designed a 4 classifiers which perform pretty decently (all of them are above 90% in accuracy).
However, they don't have similar AUC for their respective ROC curves (obviously, it doesn't have ...
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3answers
408 views
Hidden Markov model thresholding
I have developed a proof of concept system for sound recognition using mfcc and hidden markov models. It gives promising results when I test the system on known sounds. Although the system, when an ...
4
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1answer
407 views
Multi class LDA vs 2 class LDA
The problem of designing a multi-class classifier using LDA can be expressed as a 2 class problem(one vs everything else) or a multi-class problem.
Why is it that in certain cases Multi-class LDA ...
5
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1answer
421 views
Statistical measure for if an image consists of spatially connected separate regions
Consider these two grayscale images:
The first image shows a meandering river pattern.
The second image shows random noise.
I am looking for a statistical measure that I can use to determine if ...
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0answers
63 views
Where can I find a large corpus of mathematical equations as images? [closed]
during my master thesis I'm working on / towards an OCR for math. For testing purposes I need a massive set of mathematical equations of various formats (font family, font size, used equation ...
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1answer
157 views
Multinomial Naive Bayes
I'm looking for an article, program, algorithm that can clearly explain whats going on inside a Multinomial Naive Bayes classifier compared to a Gaussian Naive Bayes Classifier.
7
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1answer
302 views
Pattern of mouse (or keybord) clicks and predicting computer user's activity
Based solely on the temporal pattern of mouse clicks (a list of click times $[t_1,t_2,t_3,\ldots]$), is it possible to predict the computer user's activity?
For example out of: working vs spending ...
4
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2answers
163 views
List of likelihood-based classification techniques
This is a basic statistical pattern recognition question.
I'm aware of LDA classification, Naive Bayes Classification techniques which give output as a likelihood (of data belonging to a certain ...
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2answers
393 views
Logging similarities between vectors with R
I'm trying to write a program that automatically groups similarities between vectors. The vectors are comprised of point coordinates.
For example (assuming X, Y, and Z are numbers):
Data Set 1: [1, ...
4
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2answers
607 views
Dimensionality reduction for classifying textures with MATLAB
I am trying to apply dimensionality reduction on an a set of images (~3000 pixels) using Matlab's Dimensionality Reduction toolbox. However, I know very little about dimension reduction. So I tried ...
2
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2answers
340 views
What sort of problems is backpropagation best suited to solving, and what are the best alternatives to backprop for solving those problems?
I am developing a neuroscience-inspired training algorithm for feed-forward neural networks. The natural benchmark for comparison is backpropagation. So I need to know to know what sort of ...
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2answers
628 views
Issues in pattern recognition and plots
I am trying to compare the performance of a classification result with Bayes classifier, K-NN, principal component analysis (PCA).
I have doubts regarding the following (please excuse my lack of ...
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1answer
386 views
How to find classifier success performance?
EDIT
I am playing with pattern recognition techniques and just to get a grip of it for simplicity I have tried to develop a classifier which categorizes strings into 3 classes based on the ...
1
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0answers
118 views
Linear Discriminant Analysis for Training and Testing of data sets
I browsed through lots of literature on Linear Discriminant Analysis on the web. I can say that, I have understood most of it.
This is what I understood. You take the data, calculate mean of the ...
2
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0answers
122 views
How to recognize repeated movement patterns of mouse behavior using OpenCV?
I have a situation where I have collected mouse movement points from a website. I have a series of (x, y)-points, and I need to detect different repeated patterns of mouse movement from this data. For ...
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1answer
175 views
Modeling null transitions in the Hidden Markov Model for use with the Viterbi algorithm
I've implemented the classic HMM model from Rabiner's tutorial for gesture recognition and it has worked well. Now, I'm trying to implement the HMM Threshold Model which calls for an HMM with null ...
2
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2answers
355 views
Gesture recognition with HMM
I'm approaching at pattern recognition with HMM (with c++ or python).
My data are x and y coordinate (normalized between -1,1) of the hand in a recorded video and I want to recognize.
This is what I ...
-2
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1answer
100 views
Recognizing relationship/pattern
I have some data that I know are related but I can't seem to find the exact relationship. Was hoping someone could help find it. Left column data is related to the right column.
...
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2answers
291 views
How to compare two discrete series?
Suppose I have two series of numbers and they don't have to be time series.
$S_1=$ {9,8,1 ...}
$S_2=$ {7,9,2 ...}
What are the methods to compare these two series and make a conclusion such that ...
2
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1answer
151 views
Time series digitization
I am looking for a viable method to create an alphabet out of multidimensional time series data. My intention is to use pattern/string matching algorithms (potentially genetic) to find profitable ...
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0answers
241 views
Pattern recognition with discrete data (preferably in R)
I am trying to get a grip on pattern recognition with discrete data. Currently I started to work through the classics of Duda and Hart. Is there something you could recommend particularly for applied ...
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8answers
2k views
Measuring entropy/ information/ patterns of a 2d binary matrix
I want to measure the entropy/ information density/ pattern-likeness of a two-dimensional binary matrix. Let me show some pictures for clarification:
This display should have a rather high entropy:
...
2
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1answer
618 views
What are density and intensity of point pattern?
A simplified explanation with the focus on the following questions is being inquired. Appreciation goes in advance to whom provides scientific--simple--practical explanation.
Having an area A ...
5
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1answer
150 views
What is the best way to use a 2-class classifier for a multi-category case?
I have a 3 class sample labeled data set, which I have divided into 2 parts. I am using the first part to train the two-class perceptron classifier.
One approach is to train $\binom{3}{2}$ two-class ...
2
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1answer
166 views
How can it be proved that if number of samples are less than $d+1$, then the sample set is linearly separable?
Pattern classification by Duda, Hart, Stork (Section- 9.6.8) states that a 2-class training set of $d+1$ or less samples in a d−dimensional space is always linearly separable i.e. if the samples span ...
5
votes
1answer
275 views
Looking for pattern of events in a time series
I have a time course experiment that follows 8 treatment groups of 12 fish for 24 hours with observations made at 5 second intervals. Among the measurements made is how far each fish travels (in mm) ...
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1answer
409 views
How to detect patterns between fields of a distribution in SPSS?
Suppose I have the following simplified distribution:
...
2
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1answer
346 views
How do I capture regularity of a time series in a normalized way?
I'm looking at attempting to capture the regularity of a time series of events, one measurement per day, with a year's worth of data, and there can be at most one event a day. Say for example the day ...
1
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1answer
97 views
Measuring the effectiveness of a pattern recognition software
Are there any objective methods of assessment or standardized tests available to measure the effectiveness of a software that does pattern recognition?
