Questions tagged [feature-extraction]
For questions related to the concept of feature extraction, which is a set of techniques used to derive or create features from the existing set of features. Feature extraction is different from feature selection, which is used to select a subset of the existing features.
56
questions
0
votes
1
answer
35
views
Can DeepSort be made to track objects beside people?
As far as my understanding goes, the model used for feature extraction in DeepSort is specified as the first argument of the function create_box_encoder in the file ...
- 105
0
votes
1
answer
60
views
How does a Machine Learning model predict this classification problem?
Let’s imagine we want to create a simple Sentiment Analysis model using Machine Learning not Deep Learning algorithms, so we need to have a set of handcrafted features for this classification problem.
...
- 3
0
votes
2
answers
23
views
What's the purpose of "feature extraction using a pretrained model"?
I'm sorry this is such an elementary question because I'm an AI beginner.
In this link, it says
One thing that is commonly done in computer vision is to take a model trained on a very large dataset, ...
- 101
0
votes
1
answer
21
views
Feature Extraction for timeseries temperature signal [closed]
i have two temperature signals from which one is sensitive toward a specific event. I would like to know what other features can be useful to extract apart from:
Angles (between the two).
Slopes ( ...
- 61
0
votes
0
answers
106
views
How to extract the high-level features of YOLOv5?
I am faimilar with extracting the high-level features from any pretrained model for classification problem such as ResNet version, VGG, etc. It is easy to extract the features because there is a fully ...
- 101
1
vote
0
answers
15
views
SCINet: how does interactive learning work?
i'm having some trouble understanding how does the basic building block of a SCINet works. In the paper the author describes the SCI-block with the following figure:
In which $\phi$, $\theta$, $\eta$ ...
0
votes
1
answer
60
views
How to use image feature extraction as input to another model?
I have a dataset with the following info
Image1 x1 x2 x3 y
Image2 x1 x2 x3 y
...
Where x1, x2 & x3 are categorical features. My goal is to extract features from the images and use those features ...
- 193
2
votes
1
answer
324
views
Order of features learned by DNNs during training?
I'm looking for papers probing into the question of what features get learned when (or equivalently what subproblems get "solved" when) during the training process. For example, a paper ...
- 121
1
vote
0
answers
29
views
Pseudo Label Generation for Generative Cooperative Learning
I am trying to implement this paper for unsupervised video anomaly detection.
The gist of the paper seems to be:
Create a dataset for an unsupervised setting, by mixing up the train and anomalous ...
- 141
0
votes
0
answers
9
views
Is my Deep Feature Extractor pertinent?
I have multiple DNN that can extract features vector from images.
Those can be used for two main goals:
Use them for transfer learning ang faster trainings
Use them as feature extractors, and train ...
0
votes
0
answers
48
views
Which layers are doing image segmentation on AutoEncoders/U-NET?
While I was researching for transfer learning, I saw that people are replacing encoders with VGG-16 weights and only training the decoder part of the network.
But in some representations (like This) ...
- 1
2
votes
1
answer
375
views
How to calculate a meaningful distance between multidimensional tensors
TLDR: given two tensors $t_1$ and $t_2$, both with shape $(c,h,w),$ how shall the distance between them be measured?
More Info: I'm working on a project in which I'm trying to distinguish between an ...
- 361
0
votes
0
answers
26
views
Deep learning feature extraction using image processing batch script?
I am planning a CNN deep learning project using photos of handwritten notes, and try to label them. I am still at the early stages, but I expect that accuracy of this neural net would improve, and ...
- 101
1
vote
1
answer
48
views
Make an NN utilize other NNs as part of its decision process
Suppose I have a NN that learns to predict the time it takes a robot to move between two jobs. That's three inputs (for starters): robot, job A, job B. Not all robots travel at the same speed, and ...
- 111
2
votes
2
answers
381
views
How to convert color information to 1D feature vector?
We are making a classification model that takes a clip of a movie as an input and predicts who the director is. Roughly speaking, it will be a model that understands film directors' unique style.
We ...
0
votes
1
answer
57
views
A technique of aggregating many input images to a single representation of the relevant features within
I have a few thousand images and I would like to generate a representation of the foreground patterns within - a composition of all of its features, so to speak. In simple terms: take 10000 images of ...
- 101
1
vote
1
answer
502
views
Is the phrase "Feature Pyramid Network" refer to CNN only?
"Feature Pyramid Network" is a network that is used for feature extraction. Since it is pyramid in shape, it might be called so.
Consider the following excerpts from two different sources
#1
...
- 3,531
1
vote
0
answers
28
views
Derive information for sub-scoring from one scoring model
I am currently working in Python with a random forest algorithm to perform a scoring. My output is binary.
The idea now is to derive sub-scores from the above model that give an opinion on different ...
- 11
1
vote
1
answer
79
views
Bag of Tricks: n-grams as additional features?
I've been playing with PyTorch's nn.EmbeddingBag for sentence classification for about a month. I've been doing some feature engineering, playing with different ...
- 133
1
vote
0
answers
89
views
In SIFT, how is the coordinate system being rotated?
I need to understand how SIFT calculates the descriptors for the keypoints.
Intuitively, I understand that it takes each keypoint, calculates the gradients for each pixel in a neighborhood of the ...
- 129
0
votes
0
answers
286
views
How is the bias added after the convolution in a CNN?
I'm having trouble understanding how bias is added to the feature extraction convolution. I've seen people either refer to the bias as a single number that changes per filter or the whole matrix that ...
2
votes
2
answers
2k
views
What is the difference between feature extraction and fine-tuning in transfer learning?
I'm building a model for facial expression recognition, and I want to use transfer learning. From what I understand, there are different steps to do it. The first is the feature extraction and the ...
- 21
4
votes
1
answer
1k
views
Where do the feature extraction and representation learning differ?
Feature selection is a process of selecting a subset of features that contribute the most.
Feature extraction allows getting new features that are not actually present in the given set of features.
...
- 3,531
1
vote
1
answer
65
views
Is it a good practice to pad signal before feature extraction?
Is padding, before feature extraction with VGGish, a good practice?
Our padding technique is to find the longest signal (which is loaded .wav signal), and then, in ...
- 13
0
votes
1
answer
2k
views
How is a ResNet-50 used for deep feature extraction?
I'm trying to implement the vehicle re-identification model described in https://arxiv.org/pdf/2004.06271.pdf.
My question focuses on Section 3.2 of the paper, which uses a ResNet-50 for deep feature ...
1
vote
0
answers
20
views
Advice required for identifying bone fragments in CT-scans using STL Files (3D image segmentation)
I am working on a project related to automating the procedure of manually segmenting some bones in CT scans and hopefully if everything goes alright in this stage, move on to do something more with ...
0
votes
1
answer
86
views
How can Image Caption work?
I have two models and a file contains captions for images. The output of model 1 is .pkl files that contain the features of the images. Model 2 is the language model that will be trained with the ...
- 111
1
vote
0
answers
45
views
Can I use the SIFT feature detector on data other than images?
I know how to use SIFT algorithm for images but I never use it for other kinds of data. I have tabular data (x, y, z, time) where x,y,z is the joint position along x, y, z coordinates. Now, can I ...
- 663
4
votes
2
answers
689
views
When is it necessary to manually extract features to feed into the neural network rather than providing raw data?
Usually, Neural Networks uses raw data. You do not need to extract features manually. NN's can find & extract good features which is a pattern of an image, signal or any kind of data. When we ...
- 247
1
vote
1
answer
898
views
What is the difference between feature extraction with or without data augmentation?
Here's an extract from Chollet's book "Deep Learning with Python" about using pre-trained CNN to predict class from a photo set (p. 146):
At this point, there are two ways you could proceed:...
- 113
0
votes
0
answers
97
views
How should I use deep learning to find the rotation of an object from its 2D image?
I have 6600 images and I am supposed to know the rotation of the object in each image. So, given an image, I want to regress to a single value.
My attempt: I use Resnet-18 to extract a feature vector ...
2
votes
0
answers
65
views
Statistical method for selecting features for classification
I'm working on a classifier for the famous MNIST handwritten data set.
I want to create a few features on my own, and I want to be able to estimate which feature might perform better before actually ...
1
vote
0
answers
15
views
Neural Network for locating shifting resonant frequencies
I have multiple FFT's taken from a sample at different pressures, through different analysis I can see that the resonant frequencies are shifting in the spectrum for each FFT at a different pressure.
...
- 11
0
votes
1
answer
29
views
Which type of feature extractor do you suggest to classify sensor data?
I have IMU (Inertial Measurment Unit- 6 axis) sensor data. The sensor attached on a car and 7 different drivers wipe on same path. I want to extract features and classify drivers. Which type of ...
- 247
1
vote
1
answer
177
views
How to deal with Unix timestamps features of sequences, which will be classified with RNNs?
I want to use RNN for classifying whole sequences of events, generated by website visitors. Each event has some categorical properties and a Unix timestamp:
...
3
votes
2
answers
191
views
Is such a captcha AI-resistant?
Let's say we have a captcha system that consists of a greyscale picture (of a part of a street or something akin to re-captcha), divided into 9 blocks, with 2 missing pieces.
You need to choose the ...
user38359
0
votes
1
answer
73
views
What are some good papers or resources for aspect extraction and opinion modelling from video or audio?
I am quite new to deep learning. I just finished the deep learning specialization by Professor Andrew NG and Deep Learning AI. Now, my professor (instructor) has advised me to look into some classic ...
- 101
4
votes
1
answer
5k
views
What are bag-of-features in computer vision?
In computer vision, what are bag-of-features (also known as bag-of-visual-words)? How do they work? What can they be used for? How are they related to the bag-of-words model in NLP?
- 38.2k
1
vote
1
answer
64
views
Corner detection algorithm gives very high value for slanted edges?
I have tried implementing a basic version of shi-tomasi corner detection algorithm. The algorithm works fine for corners but I came across a strange issue that the algorithm also gives high values for ...
- 175
1
vote
1
answer
441
views
How to choose a suitable threshold value for the Shi-Tomasi corner detection algorithm?
While implementing the Shi-Tomasi corner detection algorithm, I got stuck in deciding a suitable threshold for corner detection.
In the Shi-Tomasi algorithm, all those points that qualify $\min( \...
- 175
2
votes
0
answers
26
views
Visualisation for Features to Predict Timeseries Data
I have a course assignment to use an LSTM to predict the movement directions of stock prices. One of the things I am asked to do is provide a visualization to compare the predictive powers of a set of ...
1
vote
0
answers
23
views
Feature extraction for exponentially damped signals
I am looking into exponentially damped signals where it is a stationary signal (after implementing the Adfuller statistical test) and I would like to look into how can I extract meaningful features ...
- 11
0
votes
0
answers
112
views
What are examples of commonly used feature and readout maps?
It is well-known that deep feedforward networks can approximate any continuous function from $\mathbb{R}^k$ to $\mathbb{R}^l$, (uniformly on compacts).
However, in practice feature maps are ...
- 525
0
votes
1
answer
92
views
Extract product information from email receipt HTML [closed]
I am trying to extract product information from email receipts HTML. Most services I have found focus on OCR from paper receipts or PDFs. I would imagine that extraction of product information would ...
8
votes
2
answers
4k
views
Is word embedding a form of feature extraction?
Feature extraction is a concept concerning the translation of raw data into the inputs that a particular machine learning algorithm requires. These derived features from the raw data that are actually ...
- 83
1
vote
0
answers
100
views
Plot class activation heatmap of Caffe Model in Python
Given the following 3 research papers, the authors have shown different heatmap graphical representations for features of the trained CNN models:
On the performance of Convnet feature for place ...
- 299
2
votes
1
answer
1k
views
What are the features get from a feature extraction using a CNN?
I've just started to learn CNN and somewhere I have read if I remove the last FCL I will get the features extracted from the input image but... what are those features?
Are they numbers? Labels? An ...
- 493
1
vote
1
answer
303
views
How can I use feature extraction in CNN with image segmentation?
I'm just started to learn about meta learning and CNN and in most paper that I've read they mention to have one CNN to feature extraction. These features will help the another network.
I don't know ...
- 493
1
vote
0
answers
19
views
CBIR Evaluation on contextually different data
How good would a CBIR system trained on a dataset, for example, DELF, trained on the Google Landmarks dataset, perform when evaluated on a contextually different dataset such as the WANG or the COREL ...
- 111
4
votes
2
answers
475
views
Is it true that untrained CNNs can be used as feature extractors?
I've heard somewhere that due to their nature of capturing spatial relations, even untrained CNNs can be used as feature extractors? Is this true? Does anyone have any sources regarding this I can ...
- 137