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Questions tagged [haar-wavelet]

In mathematics, the Haar wavelet is a sequence of rescaled "square-shaped" functions which together form a wavelet family or basis. They are similar to techniques used in facial recognition.

In mathematics, the Haar wavelet is a sequence of rescaled "square-shaped" functions which together form a wavelet family or basis. Haar-like features are digital image features used in object recognition. They owe their name to their intuitive similarity with Haar wavelets and were used in the first real-time face detector.

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how to get a correct spectrogram of a non-stationary signal?

in the below code i am trying to get the spectrogram of the non-stationary signalx after running the code, i expected to see some thing like the posted inage "image_2" , frequency vs time representation. but the resut of the posted code is…
rmaik
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How the window function works in STFT

Can anyone experienced in signal processing and STFT explains to me why the window function in the below posted image is from (t-t'), given that t is the total time and t' is the width of the window? I can not figure it out because, initially, the…
rmaik
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haar wavelet transform of binary image

I have a problem when I code matlab program and really need your help I have a binary image (only 0 and 1) I use haar wavelet transform by matlab code : [LL,LH,HL,HH] =dwt2( f, 'haar'); I also have four subimages. LL : has maximun is 2 and min is…
user3607620
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Image denoising using 2d Haar wavelet transform by soft-thresholding (C++)

I am trying to implement one of the basic 2D wavelet transform by Haar transformation. I applied this to the image denoising problem. My restored result has some black blocks and somw white blocks. I guess I stuck on the part of soft-thresholding…
russell-vk
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2D HAAR DWT on image with non even dimensions

How does 2d haar dwt work on images where one of dimensions or both dimensions are not even length. For example what abou image 511x511 pixels? If dimension are even then it is straightforward. From 512x512 pixels we get 4 subbands with 256x256…
user1563721
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Fastest Python way to evaluate haar feature values

Hi I am new to python and implementing Viola-Jones face detection algorithm using python. While haar-feature selection using Adaboost, my code is taking extreme time (near about 18 hours) to select one haar-feature in each round of boosting. Somehow…
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How to use Haar Feature results in Viola Jones Face Detection Algorithm

I am trying to understand the Viola-jones Face detection algorithm. In paper they have mentioned that there can be 160k plus haar features in a 24x24 pxiels image. I am struggling in understanding how to determine the weak classifier. For example…
user2793078
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Haar trained data set for gesture recognition - Counting

I have been trying to find a HAAR trained data set (OpenCV/C++) that is used to perform counting using hand fingers. I did find a lot for trained data set for hand recognition but so far not for finger counting. Is there a well known resource? Any…
user349026
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Open CV using Cmake

I am working on a harr detecttion project. I want to generate the exe files using the .cpp files that come with Opencv. I am using CMake for it. When I try to do that I am getting an error like this. Don`t know how to solve it. CMake Error at…
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OpenCV 2.4.3 Haar Classifier Error AdaBoost misclass

I am using OpenCV 2.4.3 on Ubuntu 12.10 64bit and when I run opencv_training I get an error message shown below. The training continues so I don't think it is a critical error but nonetheless it blatantly says 'Error'. I can't seem to find any…
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MatLab Daubechies Filter of colored picture form ground up - not using preset functions

this is my first post. I hope someone can help me getting started. So I've been working on image processing for a class project. We started out easy by creating a Haar transform function from scratch, which was pretty straight forward and then…
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Multiresolution Discrete Wavelet 3D Plot in Matlab

I'm trying to perform DWT and make a 3D plot using Wavelet Analysis with Multi-resolution analysis (MRA) on a 1-D signal. In short, MRA will take a discrete sampled set of data and run wavelet analysis on it. Each pass produces 1/2 the samples of…
Cookster
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emgu two hands detection

I want to detect two hands (using HSV filtered image). the problem is that when i get the two hands together the head gets in between and then the hands cannot be recognized. im using Haar to detect the 2 hands when the application starts and then i…
nadav
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Haar differentiation matrix

I wish to solve the Schordinger equation using Haar matrices as shown on equation 3.15 on the link https://scholarworks.calstate.edu/downloads/1g05fd58t When I differentiate the H4 matrice, I get the error TypeError: only size-1 arrays can be…
Stephen Tidi
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How to interpret wavelet results in weka

I entered my input data in CSV format into Weka software. Then I applied the wavelet to the data. The output of this work was Haar1, Haar2, Haar3, and Haar4. I wanted to ask what is the meaning of these outputs. Does it mean that wavelet grade 4 is…
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