Scale-invariant feature transform (or SIFT) is an algorithm in computer vision to detect and describe local features in images. The algorithm was published by David Lowe in 1999.
Applications include object recognition , robotic mapping and navigation, image stitching , 3D modeling , ge... Image ProcessingC++
dwt - digitized/discrete wavelet transform for image feature extraction. is a good feature extraction method for audio and 1 D signal too. uploader do not claim any copyright. download and use it on your own risk. digital wavelet transform or DWT is very similar to its countinuous counterpart namely... MatlabMatlab
the Project aim is to design DCT and IDCT in VHDL. DCT is used in image compression to compress the JPEG image. This file contains DCT and IDCT blocks and top module which integrates two blocks and testbench to test the two modules.... vhdlVHDL
Transofmation of map sheets. Data load from .txt, then transform map cornes by afine transformation, similarity transformation, polynomial transformation and 5-element afine transformation.... MatlabMatlab
A discrete cosine transform (DCT) expresses a finite sequence of data points in terms of a sum of cosine functions oscillating at different frequencies. DCTs are important to numerous applications in science and engineering, from lossy compression of audio (e.g. MP3) and images (e.g. JPEG) (where sm... MatlabMatlab
This Matlab script/application performs a 2D Gabor Wavelet transform on an arbitrary image,
displays the resulting transform, and then performs the inverse transform
*slowly* and *sequentially* in animation, so that one can see how the original
image is synthesized back by summing many Gabor wave... MatlabMatlab
Ever taken a digital photograph and then found out you had missed the fine details that made the scene so impressive visually? Applying a Photoshop sharpen filter may make the photo appear sharper, but such filters are lossy – they actually reduce the amount of fine detail in t... MatlabMatlab
2 Dimensional generic Fourier transform
% [ima_out] = fft2(ima_in,direction)
% This function calculates the complex Fourier transform
% of the input image ima_in. If direction is set to 1, the direct fft
% is performed, otherwise, the inverse one performed.
% ima_in : input image. Can... MatlabMatlab
File features: calculate the polluted sine signal using Wavelet transform , one of the continuous Wavelet transform, scale larger, equivalent to the Fourier transform of the w value is smaller. Used with mean 0and variance 1 sequences of Gaussian random white noise sequences... AudioMatlab
MATLAB implementation of nine-sevenths bi-orthogonal Wavelet transform, breaks up an image into the-MATLAB realize 9/7 biorthogonal Wavelet transform in the frequency domain, and the image is decomposed into the frequency domain. Aimed at strengthening the bi-orthogonal Wavelet denoising function... MatlabMatlab
its a matlab code for fast fourier transform of a square signal with a graph result.
a very fast way to determine fourier transform of a signal, with a matlab code name fft()
and then plot it... MatlabMatlab
The short-time Fourier transform (STFT) is used for transforming a signal of time to frequency domain, but often is used when our signal has low amplitude and some ranges of frequency close.
In this code you can choose what window to use. gaussian, hamming.. etc.... MatlabMatlab