 |
 |
 |
 |
 |
 |
||
 |
 |
 |
 |
 |
| 2 | 1/1 | 返回列表 |
| 查看: 808 | 回復(fù): 1 | |||
[交流]
二維快速傅里葉變換 已有1人參與
|
|
想要請(qǐng)教一下用matlab代碼處理 二維快速傅里葉變換，有時(shí)間的大佬可以聯(lián)系我交流一下嗎，求助 發(fā)自小木蟲(chóng)Android客戶端 |
回復(fù)此樓» 猜你喜歡
材料325求調(diào)劑
已經(jīng)有10人回復(fù)
-
312求調(diào)劑
已經(jīng)有5人回復(fù)
-
學(xué)碩材料275調(diào)劑
已經(jīng)有6人回復(fù)
-
中國(guó)科學(xué)技術(shù)大學(xué)材料與化工281求調(diào)劑，有科研和獲獎(jiǎng)經(jīng)歷
已經(jīng)有8人回復(fù)
-
085600 英一數(shù)二272求調(diào)劑
已經(jīng)有45人回復(fù)
-
085601 材料305分求助
已經(jīng)有5人回復(fù)
-
一志愿西工大材料學(xué)，英一數(shù)二總分321分，求調(diào)劑。
已經(jīng)有5人回復(fù)
-
求調(diào)劑院校
已經(jīng)有11人回復(fù)
-
085600求調(diào)劑
已經(jīng)有6人回復(fù)
-
材料328求調(diào)劑
已經(jīng)有5人回復(fù)
wangyikeco
木蟲(chóng) (正式寫手)
newbie
- 應(yīng)助: 84 (初中生)
- 金幣: 7009
- 帖子: 542
- 在線: 111.3小時(shí)
- 蟲(chóng)號(hào): 25598800
- 注冊(cè): 2021-03-03
- 性別: GG
- 專業(yè): 凝聚態(tài)物性 II ：電子結(jié)構(gòu)
★
小木蟲(chóng): 金幣+0.5, 給個(gè)紅包，謝謝回帖
小木蟲(chóng): 金幣+0.5, 給個(gè)紅包，謝謝回帖
|
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樓2021-07-21 00:25:42
相關(guān)版塊跳轉(zhuǎn)
我要訂閱樓主 采呀采芣苡 的主題更新
| 2 | 1/1 | 返回列表 |
| 最具人氣熱帖推薦 [查看全部] | 作者 | 回/看 | 最后發(fā)表 | |
|---|---|---|---|---|
|
[考研] 312求調(diào)劑 +3 | 醋精華了一下發(fā)?/a> 2026-03-03 | 5/250 |
|
|---|---|---|---|---|
|
|
[考研] 一志愿西工大材料學(xué)，英一數(shù)二總分321分，求調(diào)劑。 +3 | zz05zz 2026-03-02 | 5/250 |
|
|
|
[考研] 289求調(diào)劑 +8 | yang婷 2026-03-02 | 10/500 |
|
|
[考研] 理學(xué)，工學(xué)，農(nóng)學(xué)調(diào)劑，少走彎路，這里歡迎您！ +8 | likeihood 2026-03-02 | 11/550 |
|
|
|
[碩博家園] 2025屆雙非化工碩士畢業(yè)，申博 +4 | 更多的是 2026-02-27 | 5/250 |
|
|
|
[考研]
材料270求調(diào)劑
 6+6
|
Eiiiio 2026-03-01 | 11/550 |
|
|
|
[考研] 求調(diào)劑 +4 | Guo_yuxuan 2026-03-02 | 5/250 |
|
|
|
[考研] 材料學(xué)碩318求調(diào)劑 +11 | February_Feb 2026-03-01 | 11/550 |
|
|
|
[考研] 278求調(diào)劑 +3 | 滿天星11_22 2026-03-02 | 3/150 |
|
|
|
[考研] 299求調(diào)劑 +5 | kkcoco25 2026-03-02 | 9/450 |
|
|
|
[考研]
材料工程專碩283求調(diào)劑
5+8
|
，�。� 2026-03-02 | 10/500 |
|
|
|
[考研] 271求調(diào)劑 +4 | Ricardo1113 2026-03-02 | 4/200 |
|
|
|
[考研] 272求調(diào)劑 +9 | 材紫有化 2026-02-28 | 9/450 |
|
|
|
[考研] 材料085601調(diào)劑 +5 | 多多子. 2026-03-02 | 5/250 |
|
|
|
[考研] 材料調(diào)劑 +3 | 恒順自然 2026-03-02 | 3/150 |
|
|
|
[考博] 誠(chéng)招農(nóng)業(yè)博士 +3 | 心欣向榮 2026-02-28 | 3/150 |
|
|
|
[考研] 哈工大計(jì)算機(jī)劉劼團(tuán)隊(duì)招生 +4 | hit_aiot 2026-03-01 | 6/300 |
|
|
|
[考研] 299求調(diào)劑 +3 | Y墨明棋妙Y 2026-02-28 | 5/250 |
|
|
|
[考研] 調(diào)劑 +3 | 簡(jiǎn)木ChuFront 2026-02-28 | 3/150 |
|
|
|
[高分子] 求環(huán)氧樹(shù)脂研發(fā)1名 +3 | 孫xc 2026-02-25 | 11/550 |
|