Questions tagged [pattern-recognition]

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2
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1answer
35 views

reverse string to pattern matching

I have a list of patterns, and I need to find the pattern that matches an input string the most. I.e.: Patterns: ...
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0answers
10 views

Macro-area of these computer vision topics

I should write my phd thesis and I would know how could regroup these topic under one macro area: Pedestrian tracking Action recognition Change point detection I'm searching a name such as: "human ...
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0answers
17 views

What classifier can recognize differences in two text strings immediately?

I'm playing around with the TextBlob library for python. It has in it a NaiveBayesClassifier as well as a ...
3
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1answer
742 views

Trying to detect recurring events at certain intervals, e.g. daily, weeekly, monthly, annually

I don't have much experience with ML but am looking for some guidance on where I should start. I have timestamp data mapped to a certain category, e.g. travel, food, groceries, etc. Judging by ...
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1answer
40 views

What is the underlying pattern/rule in this question?

I can't find a concise algorithm for the following coding problem: Given the mapping a = 1, b = 2, ... z = 26, and an encoded message, count the number of ways it can be decoded. For example, the ...
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1answer
16 views

Detecting spoken words in audio stream or file? [closed]

I am a hobbyist interested in single word recognition. What is the state of research? Where I can get papers or/and software tools regarding that? Thanks in advance for any advice!
0
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1answer
21 views

Dimension Reduction - Which feature should remove to reduce the dimension of the matrix

Let's suppose that we have the following 2 tables: If we want to reduce the dimension by one(in every table) which feature we should remove and why ? I am confused about the way that i should work ...
1
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1answer
80 views

Which time series prediction techniques are useful given harmonic properties?

I have a time series dataset where events have harmonic properties, and seemingly the nature of the event's early segments can determine the remainder of the event (see example 1's oscillations). ...
0
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1answer
564 views

FM-index - print all patterns

How is it possible to print all patterns of length $k$ contained in a string, using the FM-index and Burrows-Wheeler transform? PROBLEM DETAIL: The input I have is: the text encoded with the Burrows-...
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0answers
27 views

Find pattern in string of unkown language

Hello I am looking for an algorithm which solves following problem for me. Given a text/string = 'BIRDBIRDBIRDBIRDDEVILDEVILDEVILDEVILEASYEASYEASY ...' of an unkown language. For the sake of ...
3
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2answers
895 views

Extracting features for texture classification

I'm a beginner in the field of pattern recognition and computer vision. I'm working on a project right now to classify t-shirt patterns into three categories i.e. solids, stripes and checks. I have ...
1
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1answer
37 views

Matching/finding mathematical plot images

I'm trying to come up with a method to match a given mathematical plot against a database of other plots. To make it more specific: plots are generated in R as PNG and might have different dimensions. ...
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0answers
31 views

Concept of Weights in Principal Component Analysis"

I have got a confusion in PCA: Is the concept of weight same as Eigenvalues as discussed in the research paper Eigenfaces for Recognition by Matthew Turk and Alex Pentland: efficient way to learn ...
4
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1answer
239 views

Finding a Simple Distribution In a Binary String

Unsupervised feature discovery of text that started with its bit string representation would need to discover octets were the first-order parse of such a bit string. This raises a question: What is ...
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2answers
82 views

The well-known classifiers that can be trained/tested in linear time [closed]

I am interested in collecting the list of the classifiers that (depending on their setting) can have linear time complexity (both in training and testing step) with respect to the number of samples $n$...
1
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1answer
27 views

What is the equation for a spiral path in 3D? [closed]

I am developing games in Unity 3D. Currently, I am trying to place 3D objects in 3D space in a spiral pattern that looks like one of 2 the strands in a pair of the DNA (helix) spiral pattern. Would ...
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0answers
160 views

Reverse engineering a neural network

Suppose we have a neural network (such as google uses for instance) which detects an object in images, which could be a cat or car. Suppose that it is instead an alien artifact that we dont have ...
1
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1answer
52 views

video shape recognition in real time

I believe from common sense that video shape recognition problems (identifying shape of a moving object) is of natural interest in many real world situations. The process of identifying is understood ...
2
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1answer
45 views

Computer vision methods without “pre-training”

I'm new to computer vision and I have a common question that I couldn't figure out with Internet or books. As I understood, in general, there are two main approaches in modern computer vision: neural ...
3
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1answer
79 views

Finding (and possibly extracting) source code in heterogenous text data set

I'm looking for a way to recognize and possibly extract source code from text files that may contain only source code, source code mixed with plain text or just plain text without any source code. ...
0
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1answer
392 views

What is the time and space complexity of Rete algorithm

I am working on pattern matching algorithm. Its working and using very less memory. For the comparison, I have to compare it with the Rete Algorithm. I have checked it in the thesis of the author, ...
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0answers
52 views

Recognizing features in images (uncontrolled environment)

I have been working for some time in several kinds of image recognition. They work well. One example is , character or shape recognition. I have implemented this in an embedded processor and I can ...
2
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0answers
24 views

Name of technique of counting pixels above geographic center line

I heard about a technique today which is sometimes used in the classification of 2D images of handwritten glyphs. It goes like this: Find the highest activated pixel of the image, the lowest ...
2
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1answer
25 views

Simultaneous regression of multiple curves in the same dataset or image?

I am getting the pattern shown in the picture from an experiment. To my human brain it is evident that it consists of some 20 straight lines. I need to find position and slope of all these lines (...
4
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4answers
905 views

Which algorithm for counting the occurrences of a certain pattern (spots) in an image?

The Problem : Finding the number of occurrences of a certain pattern (or shape) in an image. In my example, the problem is about finding the number of spots (in variety of sizes) in an image. See ...
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0answers
46 views

Finding a line shape objects (bars) in video images using neural networks (instead of Hough transform)

I'm currently trying to learn about computer vision stuff and I want to try it on a simple project of real time tracking of figures of players in a foosball game while the camera can be moving a ...
2
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1answer
96 views

How does continuous computer vision works?

First: I have programmed a few programs dealing with computer vision (not with libraries but from scratch): Simple Character and Figure Recognition Character and Figure Recognition with Neural ...
1
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1answer
89 views

Periodic Pattern recognition In a Sales Log

I'm pretty new in this field and I need some advice for my first professional challenge. I'm trying to create a sort of client segmentation from a my company's sales log which has the peculiarity ...
2
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2answers
1k views

What kind of pattern recognition algorithm would Facebook use to detect suicidal users?

Facebook announced that it would employ a machine learning "reporting process using pattern recognition in posts previously reported for suicide" (https://newsroom.fb.com/news/2017/03/building-a-safer-...
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2answers
1k views

Efficiently find smallest unique substring

Let's say we have a string $s$. We define a unique substring in $s$ as a substring that occurs only once in $s$. How can we efficiently find such a substring with the smallest length in $s$? The most ...
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0answers
49 views

Question about (in)dependent Haar-features and (Ada)boosting

I have an old exam question for my pattern recognition course which is stated as follows: Consider a pool of Haar features, determine if these Haar features are independent or not. Is it a problem ...
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3answers
165 views

Computation of normalized first derivative in discrete case

I am reading a paper on recognition of online handwritten characters. One of the features proposed in the paper is "normalized first derivatives, $(\hat{x}'_t,\hat{y}'_t)$", which they have defined as ...
1
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0answers
515 views

Using a neural network to identify patterns in strings

I am currently doing a research on data sensing and I came across the following concept. The requirement for me is to identify different data types using neural networks. Please note that I don't want ...
5
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1answer
251 views

What is a good approach to symbol identification/recognition given a path, instead of raster data

Excuse any mistakes in my description as I'm new to ML. But I have an application that takes user input to generate paths/curves (All symbols are single paths) and I would then like to attempt ...
10
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1answer
6k views

What is meant by the term “prior” in machine learning

I am new to machine learning. I have read several papers where they have employed deep learning for various applications and have used the term "prior" in most of the model design cases, say prior in ...
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0answers
36 views

Outline detection from patterns in a list of textual articles

Are there NLP algorithms dealing with detecting the repeating patterns in a a list of texts from which a topic keywords and other associative keywords can be derived? I will show it as an example: ...
2
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1answer
250 views

Changing Rabin-Karp without modulo to Rabin-Karp with modulo

I am trying to solve a string matching problem using Rabin-karp algorithm. I made use of Horner's method for calculating hash function, but I forgot to use modulo operator. It's like this now. (this ...
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0answers
253 views

Ways of object recognition in computer vision

In the field of computer vision, we talk a lot about this process of feature detection-description-matching as a way of recognizing objects. But on the other hand, there's also talks about object ...
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0answers
99 views

More Efficient Feature Method Than Haar-Feature For Face Detection

The seminal work by Viola-Jones had the most impact in face detection. It used Haar-Feature, which is fast to compute with the help of integral image method. Is there a feature method that is more ...
5
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0answers
120 views

What is the intuition behind the Geometric Burrows-Wheeler Transform?

What is the intuition behind the Geometric Burrows-Wheeler Transform? And how can I use a GBWT with blocking factor $d$ to match a given pattern $P$ of length $|P| = m$ with $m \ge d$ $m < d$ ...
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0answers
69 views

Indoor path prediction with machine learning and pattern matching

Ok. You'll have to bear with me because I'm new to this. I have an idea for a research project. It involves trying to predict a path that someone might take in an indoor environment. My idea is to use ...
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0answers
69 views

Pattern recognition and compressing a data

I am given a matrices each with 4 columns such that each element's value is between 1 to 4. Their is recurring pattern between first two digits while other two are random digits of a row. I need to ...
1
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1answer
55 views

how to identify patterns in program execution flows?

Consider a library, that is used by different programs. Under certain (unknown) circumstances, an error can occur. I want to feed execution traces of faulty programs to some kind of an algorithm / ...
3
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1answer
46 views

Simple Recognition Algorithm, How Does It Work?

I am trying to understand how a simple image recognition of an image with dynamic size could work. What I have seen is that parts of the images are taken and evaluated. For example a simple finger ...
4
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1answer
143 views

deterministic finite automaton for “does contain substring $w$” is of linear size

A (non-deterministic) finite state automaton for "all strings that contain substring $w$" is very simple. Just make the path for $w$ and add looped transitions for all letters at the first initial ...
7
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2answers
310 views

Automated lip-reading: inferring what someone is saying, based upon video of them speaking

Some humans can lip-read fairly well: by watching someone who is speaking, they can tell what the speaker is saying (even without hearing the speech). Has there been any work on building computer ...
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0answers
30 views

Batch Normalization

I've read a lot about batch normalization and how it is implemented. But I couldn't understand when to use batch normalization or not. What should we notice about the CNN to know that a batch ...
2
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1answer
495 views

Where I can I find Pre Trained CNN Datasets for Facial Emotion Recognition?

I am working on a project that involves recognising emotion from images. There are two parts in the project: One where I will generate features from images using API's and then classify the emotion ...
3
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1answer
209 views

What method of collective recogintion to use for digits recognition?

The structure of the question is as follows: at first, I provide the concept of collective recognition, further I provide explanation of the various methods of group classification that I found, in ...
2
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1answer
3k views

What are the pros and cons of RANSAC versus Hough Transform?

A friend needs to find the pool balls in an image of a pool table. Would a Hough transform be a good idea? Why/why not? Would RANSAC be better? The question comes from this study guide (http://www.cc....