# Questions tagged [classification]

is a system of grouping objects of study or observation in accordance with their common features. The classification problem is a formalized task in which a set of objects (cases), separated in some way to classes.

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### What is the best feature selection method when working with audio and a binary output?

I am working on a problem as I am trying to determine which is the best feature to use when working with audio. I have a piece of audio and I am trying to determine which is the best feature to use ...
52 views

### High FIR order in time critical classification task

I have a question regarding filtering (bandpass in my case) as a preprocessing step before a classification task. The frequency band I am interested in lies between 0.5 - 22 Hz which results in a ...
99 views

### why is the signal divided into epochs in EEG classification?

I'm new in EEG signal classification. Studying the literature on this topic, I wonder why the EEG signals are divided in epochs, so, instead of classifying the whole signal all at once, we usually ...
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### Upsampling vs downsampling. Which to use when?

Downsampling reduces dimensionality of the features while losing some information. It saves computation. Upsampling brings back the resolution to the resolution of previous layer. My question is which ...
38 views

### Meaningfulness of Frequency Spectrum for Classification

I just started to dive into signal processing due to a free-time project. Therefore, this is my first question here, for which I searched many previous threads, but couldn't find what I was looking ...
42 views

### How mic setting will affect audio classification model?

I have audio samples with three classes : 100 audio samples : class 'A' 100 audio samples : class 'B' 100 audio samples : class 'C' ...
19 views

### What is local and global information?

Recently, i have read image classification papers for a literature review. During the review, i have found "global information" and "local information" mentioned in many papers assuming they are well ...
6 views

### How to identify images likely to be from the same photo shoot based on color balance and other visual characteristics

I'm trying to design an image databasing tool with a high-efficiency assisted tagging UI and I need to identify candidates for photos being from the same image set (ie. typically, same photo shoot) so ...
47 views

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### Classification test by embedding true positives in high frequency recordings

I'm evaluating a cyclostationary approach to signal classification. My first step in doing so was generating signals and embedding them into a few specified parameter sets of the Watterson channel ...
126 views

### feature selection for classification for rare classes

I have a spectrogram of a signal and want to classify it. I used different features such as MFFC, the density of power spectrum and other common features and classify using the random forest, but I ...
2k views

### From MFCC to Machine learning. What are the steps?

I was able to get a dataset with MFCC coefficients. However, depending on the length of my sound file I get a different sized matrix. As in, 13 (13 MFCC coefficients) by XXX, where XXX will vary ...
542 views

### What would the target matrix to train Neural Network?

I'm new at Artificial Neural Network and I'm using MATLAB developing Facial expression recognition and There are six expressions ; I'm not able to understand about How to create a target matrix? My ...
190 views

### Generate and Recognize Graphical Patterns

I'd like to develop an algorithm for recognizing and generating graphical designs. As an example, consider these examples from one class: class 1 example 2 http://185.49.85.137/Kave/up/Decorative-...
9k views

### MFCC feature vector from wav file

I am trying to implement a spoken language identifier from audio files, using Neural Network. I need to generate one feature vector for each audio file. From what I have read the best features (for ...
76 views

### anti-spoofing systems

I am working with face anti-spoofing. The database consists of a number of real face images and a number of fake images. After pre-processing and feature extraction, I have a feature vector for each ...
94 views

### Separate key-related frequencies from audio signal

I have various samples of various instruments sound, and I'm trying to classify them using pyAudioAnalysis and various Machine Learning algorithms. The samples ...
195 views

### Compute ADSR: How? Does it make sense?

I'm writing a Master degree thesis on Instrument Recognition using pyAudioAnalysis. I was wondering if results could be improved by also analyzing the ADSR shape of the samples. All I find on the ...