Stack Overflow
Stack Overflow

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.

117 questions
0
votes
4 answers

Create NxN Haar Matrix

I can't find a definition for generating an un-normalized NxN Haar matrix. So what is the equation? see: http://en.wikipedia.org/wiki/Haar_wavelet Thx, Chris
user2372976
  • 715
  • 1
  • 8
  • 19
0
votes
1 answer

Find the maximum connected component

I have a binary image (image1). Now I want to detection where is the figure ( may be include big text) in original image. I use haar wavelet transform and detec a image B include some position may be the figure of A. (image 2). If I use image A -…
user3607620
  • 11
  • 1
  • 4
0
votes
1 answer

apply wavelet with haar filter and reconstruction image with approximation coefficients

I want apply wavelet with haar filter on an image and then reconstruction the image with approximation coefficients. I run this code in matlab: f = imread('pic.tif'); sX = size(f); [cA,cH,cV,cD] = dwt2(f,'haar'); x =…
mgh
  • 921
  • 3
  • 9
  • 37
0
votes
1 answer

OpenCV Haar Classifier - how does it know when an object has been matched in live video

I have a trained OpenCV Haar Classifier, I am using the sample face detect program and supplying my classifier xml file as an argument. The program is working as expected, my question is how does the program know when the object has been…
Colin747
  • 4,955
  • 18
  • 70
  • 118
0
votes
1 answer

what does wavelet decomposition structure mean?

running the code: >> load('matlabF.mat') >> f f = 4 6 10 12 8 6 5 5 >> [c,l] = wavedec(f,3,'haar'); >> c c = 19.7990 2.8284 -6.0000 2.0000 -1.4142 -1.4142 1.4142 0 >> l l…
Sepideh Abadpour
  • 2,550
  • 10
  • 52
  • 88
0
votes
1 answer

Strange values for approximating coefficients in wavelet decompsition in Matlab

I'm trying to get wavelet decomposition of arcsin(x) using, say, Haar wavelets When using both Matlab's dwt or wavedec functions, I get strange values for approximating coefficients. Since applying low-pass Haar wavelets's filter equals to…
Dmitry
  • 317
  • 3
  • 10
0
votes
1 answer

How to view positives during Haar Cascade classification

everyone, I have trained my own classifier in Opencv and when I run it a get kind of bad results. My goal is to use the Haar features as a guideline so I'd like to view the positives not after the entire cascade classifier has been executed but in…
Maik Xhani
  • 65
  • 8
0
votes
0 answers

Android & OpenCV detection and performances using Haar-like algorithm

I am looking for a way to achieve head detection and tracking with reasonable performance on a "mid-level" android device, using OpenCV. What i thought (using Haar-like algorithm): Resize every video frame to be smaller, then convert it to…
Tcz
  • 661
  • 5
  • 18
0
votes
1 answer

Is the threshold of Haar-feature is calculated by the only way, Viola-Jones described in their paper?

I am implementing Viola-Jones face detection algorithm and bit confused about haar-feature threshold. I am calculating the threshold of haar-feature using follow. steps: a) Calculate the haar-feature value in all positive(face) images respective to…
user2766019
  • 577
  • 4
  • 7
  • 20
0
votes
1 answer

Matlab Haar Wavelet

My task 1. I have a haar filter such as [1][-1] 2. I have an image such as - - [a][b][c][d] - - [e][f][g][h] 3. I want to perform a wavelet transform on the image and have the following result: - - Step 1: - - -…
sflee
  • 1,659
  • 5
  • 32
  • 63
0
votes
1 answer

How to detect human using findcontours based on the human shape?

I wanna ask how to detecting humans or pedestrians on blob (findcontours)? I've try to learn how to detecting any object on the frame using findcontours() like…
Shabanzo
  • 87
  • 1
  • 3
  • 11
0
votes
1 answer

how to map negative values to rgb component?

I want to apply haar transformation on a colored image. For this I will have to apply the haar function on red, green and blue components separately. Now according to my understanding, haar function is averaging and differencing. So the red, blue…
Manasvi Karanam
  • 27
  • 3
  • 10
0
votes
1 answer

haar wavelet transform

I have a function which will calculate haar transformation for an image. Now i am passing the pixel values of the image directly to the haar function for computation. Iam not getting the original image back in LL sub band. Please help me whats…
Manasvi Karanam
  • 27
  • 3
  • 10
0
votes
1 answer

Is there any java library for Wavelet transformation using Haat as mother wavley?

Hi am developing an application which is use wavelet transformation for feature extraction. I am not able to translate 2d Discrete wavelets Transformation for with haar transformation . I need a source code to do it. Is there any java library…
Mitul Ahir
  • 11
  • 3
0
votes
0 answers

Display Haar features from a trained AdaBoost classfier

Is there a way to display visually which Haar features are used at every stage of the classifier? I have recently trained a classfier to detect vehicles, using opencv_traincascade.exe. For further analysis, I would like to see the features being…
Yaobin Then
  • 2,662
  • 1
  • 34
  • 54
1 2 3 4 5 6
7
8