| 查看: 830 | 回复: 1 | |||
[交流]
二维快速傅里叶变换 已有1人参与
|
|
想要请教一下用matlab代码处理 二维快速傅里叶变换，有时间的大佬可以联系我交流一下吗，求助 发自小木虫Android客户端 |
回复此楼» 猜你喜欢
建环，能源，土木老师路过看一看！！！
已经有5人回复
-
一志愿华东理工大学，080500学硕，317分，求调剂
已经有15人回复
-
初试成绩337找调剂
已经有3人回复
-
材料专硕 调剂
已经有5人回复
-
求材料调剂，一志愿郑州大学289分
已经有13人回复
-
320求调剂
已经有3人回复
-
一志愿0817化学工程与技术，求调剂
已经有12人回复
-
土木水利328分求调剂
已经有6人回复
-
数一英一285求调剂
已经有7人回复
-
333求调剂
已经有6人回复
wangyikeco
木虫 (正式写手)
newbie
- 应助: 84 (初中生)
- 金币: 7117.5
- 帖子: 549
- 在线: 112.7小时
- 虫号: 25598800
- 注册: 2021-03-03
- 性别: GG
- 专业: 凝聚态物性 II ：电子结构
★
小木虫: 金币+0.5, 给个红包，谢谢回帖
小木虫: 金币+0.5, 给个红包，谢谢回帖
|
fft2 2-D fast Fourier transformcollapse all in page Syntax Y = fft2(X) Y = fft2(X,m,n) Description example Y = fft2(X) returns the two-dimensional Fourier transform of a matrix using a fast Fourier transform algorithm, which is equivalent to computing fft(fft(X).').'. If X is a multidimensional array, then fft2 takes the 2-D transform of each dimension higher than 2. The output Y is the same size as X. example Y = fft2(X,m,n) truncates X or pads X with trailing zeros to form an m-by-n matrix before computing the transform. Y is m-by-n. If X is a multidimensional array, then fft2 shapes the first two dimensions of X according to m and n. Examples collapse all 2-D Transform View MATLAB Command The 2-D Fourier transform is useful for processing 2-D signals and other 2-D data such as images. Create and plot 2-D data with repeated blocks. P = peaks(20); X = repmat(P,[5 10]); imagesc(X) Figure contains an axes. The axes contains an object of type image. Compute the 2-D Fourier transform of the data. Shift the zero-frequency component to the center of the output, and plot the resulting 100-by-200 matrix, which is the same size as X. Y = fft2(X); imagesc(abs(fftshift(Y))) Figure contains an axes. The axes contains an object of type image. Pad X with zeros to compute a 128-by-256 transform. Y = fft2(X,2^nextpow2(100),2^nextpow2(200)); imagesc(abs(fftshift(Y))); Figure contains an axes. The axes contains an object of type image. Input Arguments collapse all X — Input array matrix | multidimensional array Input array, specified as a matrix or a multidimensional array. If X is of type single, then fft2 natively computes in single precision, and Y is also of type single. Otherwise, Y is returned as type double. Data Types: double | single | int8 | int16 | int32 | uint8 | uint16 | uint32 | logical Complex Number Support: Yes m — Number of transform rows positive integer scalar Number of transform rows, specified as a positive integer scalar. Data Types: double | single | int8 | int16 | int32 | uint8 | uint16 | uint32 | logical n — Number of transform columns positive integer scalar Number of transform columns, specified as a positive integer scalar. Data Types: double | single | int8 | int16 | int32 | uint8 | uint16 | uint32 | logical More About collapse all 2-D Fourier Transform This formula defines the discrete Fourier transform Y of an m-by-n matrix X: Y p+1,q+1 = m−1 j=0 n−1 k=0 ω jp m ω kq n X j+1,k+1 ωm and ωn are complex roots of unity: ω m =e −2πi/m ω n =e −2πi/n i is the imaginary unit. p and j are indices that run from 0 to m–1, and q and k are indices that run from 0 to n–1. This formula shifts the indices for X and Y by 1 to reflect matrix indices in MATLAB®. |
2楼2021-07-21 00:25:42
