The frequency domain plays an important role in image processing to smooth, enhance, and detect edges of images. Although image data typically does not include imaginary values, the fast Fourier Transform (FFT) has been used for obtaining spectra. In this paper, the fast Hartley Transform (FHT) is used to Transform two-dimensional image data. Because the Hartley Transform is real valued, it does not require complex operations. Both spectra and autocorrelations of two-dimensional ultrasound images of normal and abnormal livers were computed.
标签: processing frequency important enhance
上传时间: 2014-01-08
上传用户:1051290259
An important book that cover wavelet domain. It help a lot in understanding wavelets and their applications. Beside explanations of the Transform and application of this, there are also presents the reasons why wavelets are better than Fourier Transform.
标签: understanding important wavelets wavelet
上传时间: 2017-06-14
上传用户:lanhuaying
一种新的方法,可以自动对两幅图像进行 ·Matlab code for encoding an unwrappi ·冈萨雷斯的经典教材数字图像处理的matl ·Fast Fourier Transform ·《Matlab控制系统与应用实例》一书源码 ·Bayesian Compressed Sensing ·永磁同步电动机的空间矢量控制simulink ·Matlab计算信噪比,单声道,双声道均可
标签:
上传时间: 2017-06-25
上传用户:从此走出阴霾
NN Functions a program in Lisp to demonstrate working of an artificial neuron. (Enter an input vector X and weight vector W. Calculate weighted sum XW. Transform this using signal or activation functions like logistic, threshold, hyperbolic-tangent, linear, exponential, sigmoid or some other functions (syntax provided) and display the output).
标签: demonstrate artificial Functions program
上传时间: 2013-12-30
上传用户:hfmm633
数字控制振荡器(NCO,numerical controlled oscillator)是软件无线电、直接数据频 率合成器(DDS,Direct digital synthesizer)、快速傅立叶变换(FFT,Fast Fourier Transform) 等的重要组成部分,同时也是决定其性能的主要因素之一,随着芯片集成度的提高、在信号 处理、数字通信领域、调制解调、变频调速、制导控制、电力电子等方面得到越来越广泛的 应用。
上传时间: 2017-07-15
上传用户:nanshan
Abstract - A fl exible multiscale and directional representation for images is proposed. The scheme combines directional fi lter banks with the Laplacian pyramid to provides a sparse representation for two- dimensional piecewise smooth signals resembling images. The underlying expansion is a frame and can be designed to be a tight frame. Pyramidal directional fi lter banks provide an effective method to implement the digital curvelet Transform. The regularity issue of the iterated fi lters in the directional fi lter bank is examined.
标签: representation directional multiscale Abstract
上传时间: 2013-12-15
上传用户:zxc23456789
Main program running when workpiece is ready on deferent belt(deferent_ready=ture). * Call Square_Wave subroutine to generate 0.5ms square wave on P1.2 to drive * electromotor,then drive deferent belt step forward. When it steps to the measure * zone, it stops to be measured. Then call A_D subroutine to Transform analog * signals to digital signals , after then call serial subroutine to transfer * digital signals to PC. Call square wave subroutine to drive deferent belt step to * original position waitting for defere ready flag to run the next circle.
标签: deferent_ready workpiece deferent program
上传时间: 2017-08-31
上传用户:baiom
Use the fast Fourier Transform function fft to analyse following signal. Plot the original signal, and the magnitude of its spectrum linearly and logarithmically. Apply Hamming window to reduce the leakage. . The hamming window can be coded in Matlab as for n=1:N hamming(n)=0.54+0.46*cos((2*n-N+1)*pi/N); end; where N is the data length in the FFT.
标签: matlab fft
上传时间: 2015-11-23
上传用户:石灰岩123
关于stockwell Transform的学位论文
上传时间: 2017-06-10
上传用户:yyy344
一中流水线结构的FFT,构建的一中新的FFT,基于流水线结构使得其运行速度更快,更适合实用。
标签: Transform pipeline fourier fast
上传时间: 2018-03-26
上传用户:lpyaking