Questions tagged [feature-extraction]

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Active Appearance Model annotating landmarks of the face
I am implementing a speech animation system.For that I need to extract the features of visual speech data (Speaker data) to train the models. T...
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How to enhance feature detection using ORB in Opencv?
I'm developing an Android application to match two images using ORB feature detection . The processing and matching logic is called in java usin...
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Measure of feature map similarity using SSIM
We know SSIM needs luminance, contrast, and structures of two images to measure their similarity. I believe SSIM itself can be directly used onto...
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Multilayer Neural Network Architecture for Feature Classification with small dataset
I am a newby to neural networks. I am trying to solve a classification problem with a multilayer neural network. A data sample consists out of 40...
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Generate feature matrix over time: how to append a vector of Mat into each row of a Mat?
I am trying to extract a histogram matrix for every 5 frames in a video for further processing. The process is as follow: From 1st to 5th frame...
asked 4 months ago
1 votes
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Compute future features with featuretools
I'm trying to use featuretools to generate a feature matrix to train on past data and predict some future data. So this is my setup: import feat...
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Local Binary Patterns features
I have a dataset of images that differ in sizes, and when I extract the local binary pattern (uniform local binary 59 feature) from them I get s...
-2 votes
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how to do segmentation and feature extraction for this image?
I have problem with this image and I have more than one images like this. I got zeros value for this image. Can you teach or guide me on how to d...
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What is the maximum orientation difference between two local feature key points?
I am trying to calculate the maximum difference between two previously defined local feature keypoints. My keypoint is defined as x, y, scale, or...
1 votes
1 replies
How to pass the HH subband of an image to greycomatrix function?
I'm using scikit-images's function greycomatrix, to which I want to give as input one of the components obtained from wavelet transform after haa...
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Merge detected Houghlines to extract and segment bands in python
I need to extract these bands characterized by their geometric forms, but I don't know how to do that by using lines detected by Hough. Detected...
2 votes
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Using TfidVectorizer() but get error 'ValueError: X has 3 features per sample; expecting 3231926'
My project is building classifier to classify url which is safe to visit and this is dataset for training model using SVMLight format "http://ww...
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Local Binary Patterns features using matlab 'extractLBPFeatures'
I am trying to understand the extractLBPFeatures function to extract the 59 uniform features, here is a simple code that extracts the 59 features...
-3 votes
2 replies
Contributions of variables to PC in python [closed]
I used PCA to find 60 PC's: N_comp=60 from sklearn.decomposition import PCA pca = PCA(n_components = N_comp) X_pca=pca.fit_transform(X_scale) #...
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Original features percentage composing PC1 in PCA
I used PCA to find 60 PC's: N_comp=60 from sklearn.decomposition import PCA pca = PCA(n_components = N_comp) X_pca=pca.fit_transform(X_scale) #...
1 votes
1 replies
TypeError: fit_transform() missing 1 required positional argument: 'raw_documents'
I'm trying to do feature extraction text with Sklearn, however I'm getting error Type error:fit_transform() missing 1 required positional...
1 votes
1 replies
How to avoid inf value while feature extracting in Matlab?
I’m trying to extract features from some EEG signals. One of the trails in my for loop creates inf value and emd doesn’t accept it so it causes a...
1 votes
1 replies
How do I handle string feature in Recursive feature elimination or model training using SVM?
I have data which looks like this shift_id user_id status organization_id location_id department_id open_positions city zip role_id sp...
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how to remove irrelevant documents from gensim latent dirichlet allocation
I am trying to build a domain agnostic tool that will read a list of documents (product reviews, feedback, tweets, paragraphs from a book) and re...
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Recursive dependency parsing and feature extraction
I am working on a research on linguistics and I am facing trouble in preparing data for machine learning. Here I have a sentence: The Tibetan d...
5 votes
1 replies
Feature Hashing on multiple categorical features(columns)
I would like to hash feature ‘Genre’ into 6 columns and separately feature ‘Publisher’ into another six columns. I want something like below:...
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Scratch Detection on Noisy Textured Surface
I have troubles in extracting scratches from noisy textured surface background. I have tried several ways such as stacking smoothed image...
2 votes
1 replies
Why feature extraction of text don't return all possible feature names?
Here is the snippet of code from the book Natural Language Processing with PyTorch: import numpy as np from sklearn.feature_extraction.text imp...
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I have built an image search using VGG16. It takes 4 mins to go through the search. what are the techniques that I can use to shorten this time?
I have built an image search using VGG16 engine, I have a data set of about 20,000 images. It takes 4 mins to go through the search. what are the...
1 votes
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Discrete wavelet transform for image texture analysis
I am planning to use the discrete wavelet transform to extract textural features from grayscale images for classification purpose. However, I am...