疑難雜症萬事通
在網路上遇到任何問題都可以在這邊找找看唷

Search

關於 matlab conv2 ，我們在網路上蒐集到這些相關的討論、資訊與評價

相關標籤 相關照片 相關影片
社群媒體上有些相關的討論：

matlab conv2 在 Re: [問題] conv2()如何轉換- 看板C_and_CPP - 批踢踢實業坊 的推薦與評價


作者HuangTzHuan ()
看板C_and_CPP
標題Re: [問題] conv2()如何轉換
時間Wed May 11 13:55:33 2011

: 您好^^
: 小弟最近需要使用到MATLAB裡的conv2()這個函數
: 而是在C++裡完成這個動作
: 想問看看是否有現成的source code可以直接拿來用
: 就像FFT2可以用fftw裡的函數來執行一樣
: 麻煩好心人士幫忙了!!!!!!
: 感謝~~~~~~~~
:
: --
: ※ 發信站: 批踢踢實業坊(ptt.cc)
: ◆ From: 175.180.110.251
: → uranusjr:折積公式看一看自己實作應該比在這邊苦等還快... 05/10 08:48
: → angleevil:我也蠻想知道source code要怎麼找 05/10 10:05
: 推 purpose:google 搜尋，或丟新台幣懸賞 05/10 10:10
: 推 MarcusWayne:matlab 裡面不是可以看到函數的c code嗎? 05/10 12:14

恐怕不行，因為 matlab 的內建函數是用 java 寫的
(最底層是用 blas/lapack，有可能是用 intel math kernel library)
非內建函式則是用 matlab 寫的

剛好 conv2 並不是內建函式，所以可以看到 code
如果有裝 matlab 可以在這裡找到：

toolbox/eml/lib/matlab/datafun/conv2.m

因為有版權問題，我就不貼上來了

: → yanzichan:看來只好用用看GOOGLE或者自己寫了!! 05/10 15:50
: → yanzichan:但自己寫又怕效果很糟跑起來不快!!!!! 05/10 15:50
: → loveme00835:寫出來之後才有快不快的問題... 05/10 18:09
: → yanzichan:最後真的找不到!!!!! 05/10 20:14
: → yanzichan:就自己寫了XD 05/10 20:14
: → uranusjr:其實真的要優化可以去看 Octave 的原始碼 (爆) 05/10 21:16

這個就可以貼了
octave 解開來在 src/DLD-FUNCTIONS/conv2.cc
我在這裡放了一份 3.2.4 的：

https://codepad.org/4pFFaxtL


我看了一下 matlab 和 octave 的 code
大致上想法是這樣：

假設 conv2(A, B)

if size(A) < size(B)
交換 A and B

if Separable
(拆成 x 和 y 分開做 1D 的版本)
conv(A_, B_)
conv(A|, B|)
else
暴力做 convolution

剩下的就是實作上的 opmization 了


另外如果 A 和 B 的 size 都很大，而且很接近的話
conv2(A, B) = fft'( fft(A).*fft(B) ) 這樣會比較快

--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 140.112.30.49






... <看更多>

matlab conv2 在 #請益請益matlab conv2 error - 軟體工程師板 | Dcard 的推薦與評價

請益請益matlab conv2 error. 軟體工程師. 6月10日02:08. N-D arrays are not supported. 遇到這個問題要怎麼處理，我跑別人給的圖片沒問題，跑自己的圖片就有問題，我 ... ... <看更多>

matlab conv2 在 Replicate MATLAB's `conv2()` in Frequency Domain - Signal ... 的推薦與評價

I created a MATLAB function which is basically conv2() applied in Frequency Domain: function [ mO ] = ImageConvFrequencyDomain( mI, mH, ... ... <看更多>

matlab conv2 在 SciPy convolve2d vs Matlab conv2 'same' mode - gists · GitHub 的推薦與評價

SciPy convolve2d vs Matlab conv2 'same' mode. GitHub Gist: instantly share code, notes, and snippets. ... <看更多>

你可能也想看看
MATLAB conv2
matlab conv2用法
MATLAB conv2 用法
matlab convolution寫法
MATLAB conv 意思
matlab conv意思
Matlab convolution code
2D convolution
搜尋相關連結

#1. 2-D convolution - MATLAB conv2 - MathWorks

C = conv2( A , B ) returns the two-dimensional convolution of matrices A and B . ... C = conv2( u , v , A ) first convolves each column of A with the vector u , ...

#2. MATLAB卷積運算（conv、conv2、convn）解釋- IT閱讀

MATLAB 卷積運算（conv、conv2、convn）解釋 ... 所謂兩個向量卷積，說白了就是多項式乘法。 比如:p=[1 2 3],q=[1 1]是兩個向量，p和q的卷積如下：

#3. matlab中conv2函数_恰同学少年的博客 - CSDN

matlab 中conv2 函数在计算二维卷积应用实例如下：格式：C=conv2(A,B) C=conv2(Hcol,Hrow,A) C=conv2(...,'shape')说明：对于C=conv2(A,B)，conv2 计算 ...

#4. [訊號處理] 2d Convolution & 簡單的影像處理(利用MATLAB )

其中∗∗ 表示二維convolution，在MATLAB 中我們可以使用conv2 來執行此運算。下圖顯示了上述討論的觀點：. Comments:

#5. conv2 (MATLAB Function Reference)

C = conv2(A,B) computes the two-dimensional convolution of matrices A and B . If one of these matrices describes a two-dimensional FIR filter, ...

#6. Replicate MATLAB's `conv2()` Using Fourier Domain ...

I would like to take two images and convolve them together in Matlab using the 2D FFT without recourse to the conv2 function. However, I am ...

#7. conv2 (MATLAB Functions)

C = conv2(A,B) computes the two-dimensional convolution of matrices A and B . If one of these matrices describes a two-dimensional finite impulse response ...

#8. matlab conv2 函式 - w3c菜鳥教程

matlab conv2 函式,matlab中conv2 函式在計算二維卷積應用例項如下格式c conv2 a b c conv2 hcol hrow a c conv.

#9. #請益請益matlab conv2 error - 軟體工程師板 | Dcard

請益請益matlab conv2 error. 軟體工程師. 6月10日02:08. N-D arrays are not supported. 遇到這個問題要怎麼處理，我跑別人給的圖片沒問題，跑自己的圖片就有問題，我 ...

#10. [轉] conv2、filter2、imfilter的區別

假設輸入圖像A大小為ma x na，卷積核大小為mb x nb，則MATLAB的conv2函數實現流程如下： a、對輸入圖像補零，第一行之前和最后一行之后都補mb-1行，第 ...

#11. MATLAB中conv2的详细用法_触动人生的博客-程序员宝宝

假设输入图像A大小为ma x na，卷积核大小为mb x nb，则MATLAB的conv2函数实现流程如下： a、对输入图像补零，第一行之前和最后一行之后都补mb-1行，第一列之前和最后 ...

#12. MATLAB卷积运算（conv、conv2、convn）解释 - 博客园

1 conv（向量卷积运算）所谓两个向量卷积，说白了就是多项式乘法。比如:p=[1 2 3],q=[1 1]是两个向量，p和q的卷积如下：把p的元素作为一个多项式的 ...

#13. Replicate MATLAB's `conv2()` in Frequency Domain - Signal ...

I created a MATLAB function which is basically conv2() applied in Frequency Domain: function [ mO ] = ImageConvFrequencyDomain( mI, mH, ...

#14. conv2 (MATLAB Functions)

C = conv2(A,B) computes the two-dimensional convolution of matrices A and B . If one of these matrices describes a two-dimensional finite impulse response (FIR) ...

#15. MATLAB conv2卷積的實現 - 程序員學院

MATLAB conv2 卷積的實現,二維卷積的演算法原理比較簡單，參考任意一本數字訊號處理的書籍，而matlab的conv2函式的濾波有個形狀引數，用下面的一張圖很 ...

#16. SciPy convolve2d vs Matlab conv2 'same' mode - gists · GitHub

SciPy convolve2d vs Matlab conv2 'same' mode. GitHub Gist: instantly share code, notes, and snippets.

#17. MATLAB的conv2函数 - 程序员大本营

MATLAB 的conv2函数实现步骤（conv2（A,B））：. 其中，矩阵A和B的尺寸分别为ma*na即mb*nb. ① 对矩阵A补零，第一行之前和最后一行之后都补mb-1行，第一列之前和最后 ...

#18. MATLAB中conv2卷积使用方法

C=conv2(A,B,shape);%记住在shape时要用''1、函数定义A:输入图像，B:卷积核 假设输入图像A大小为maxna，卷积核B大小为mbxnb，...,CodeAntenna技术文章技术问题代码片段 ...

#19. conv2 (Image Processing Toolbox)

C = conv2(A,B) performs the two-dimensional convolution of matrices A and B , returning the result in the output matrix C ... conv2 is a function in MATLAB.

#20. The equivalent function of MATLAB filter2/conv2 function in ...

The equivalent function of MATLAB filter2/conv2 function in Python language, Programmer All, we have been working hard to make a technical sharing website ...

#21. 二维卷积- MATLAB conv2 - MathWorks 中国

此MATLAB 函数返回矩阵A 和B 的二维卷积。 ... 在图像处理等应用程序中，它可用于将卷积的输入直接与输出进行比较。 conv2 函数允许您控制输出的大小。

#22. c++ - 与OpenCV中的Matlab Conv2等效 - IT工具网

在Matlab中有像OpenCV或C++这样的简单函数吗？ 这是一个例子: A= [ 1 -2 3 4 ] 我想将它与 [-0.707 0.707] 卷积. Matlab的conv2结果是 -0.7071 2.1213 -1.4142 -2.1213 ...

#23. CV預備(一):conv2,filter2,imfilter的差別 - 程式前沿

目錄前言filter2 實操conv2 imfilter 最後前言最近開始準備深入學習一下計算機視覺(CV)方面的內容, 這裡會更新幾期基礎知識, 主要是Matlab和Python ...

#24. Application of 2D convolution via MATLAB - YouTube

#25. Matlab's Conv2 equivalent in OpenCV - py4u

Matlab's Conv2 equivalent in OpenCV. I have been trying to do Convolution of a 2D Matrix using OpenCV. I actually went through this code ...

#26. MATLAB: IntegralFilter() vs. conv2() speed - iTecTec

conv2 Image Processing Toolboximfilterintegralfilter conv2 speed. Hi, I'm using the integralFilter() matlab function in an algorithm for image processing.

#27. Convolution

The first method is the zero-padding, i.e. extending f by zero outside its domain. We use the Matlab command conv2 to compute the two-dimensional convolution of ...

#28. [截] matlab conv2 filter2 imfliter - 新浪博客

如果适应卷积运算对图像进行滤波，在matlab中可以通过2个不同的函数来实现conv2和imfliter。他们的调用方式如下：. Img_n = conv2(Img,g,'same'); 和.

#29. 图像处理中任意核卷积(matlab中conv2函数)的快速实现 ...

图像处理中任意核卷积(matlab中conv2函数)的快速实现。，卷积其实是图像处理中最基本的操作，我们常见的一些算法比如：均值模糊、高斯模糊、锐 ...

#30. matlab中conv2的详细用法 - BiliBili

2、实现步骤 假设输入图像A大小为ma x na，卷积核大小为mb x nb，则MATLAB的conv2函数实现流程如下： a、对输入图像补零，第一行之前和最后一行之后都 ...

#31. matlab中conv2 函数的用法_cas0611的博客-程序员宅基地

matlab 中conv2 函数在计算二维卷积应用实例如下：格式：C=conv2(A,B) C=conv2(Hcol,Hrow,A) C=conv2(...,'shape')说明：对于C=conv2(A,B) ，conv2 的算矩阵A 和B 的卷 ...

#32. 需matlab内置函数conv2的源代码！

MATLAB 中文论坛MATLAB 图像处理与计算机视觉板块发表的帖子：需matlab内置函数conv2的源代码！。网上有个帖子是假的，就不要提那个了：

#33. conv2 with custom operator : r/matlab - Reddit

I am looking for function that is able to do something like conv2 function does, but without multiplication step.

#34. conv2 (Matlab function) - 2-D Convolution - Scilab Online Help

... equivalents > C > conv2 (Matlab function). conv2 (Matlab function). 2-D Convolution. Matlab/Scilab equivalent. Matlab, Scilab. conv2.

#35. 卷积与多项式-MATLAB指令引出的思考 - 知乎专栏

引子在MATLAB中，对于卷积与多项式的计算使用的一个指令： [1]conv(p1,p2)创建包含多项式x^2+1 和2x+7 的系数的向量u 和v 。u = [1 0 1]; v = [2 7]; ...

#36. MATLAB卷積函式conv有幾種用法？ - 劇多

MATLAB 卷積函式conv有幾種用法？ ... [Mb,Nb]=size(B), 則size(C)=[Ma+Mb-1,Na+Nb-1]; C=conv2(Hcol,Hrow,A) 中，矩陣A 分別與Hcol 向量在列方向 ...

#37. MATLAB卷积运算（conv、conv2、convn）_小刀的专栏

MATLAB 卷积运算（conv、conv2、convn）_小刀的专栏-程序员信息网_matlab卷积运算 ... 所谓两个向量卷积，说白了就是多项式乘法。 比如:p=[1 2 3],q=[1 1]是两个向量，p和q的 ...

#38. MATLAB conv2卷积的实现

二维卷积的算法原理比较简单，参考任意一本数字信号处理的书籍，而matlab的conv2函数的滤波有个形状参数，用下面的一张图很能说明问题：.

#39. matlab的conv2、imfilter、filter2 - 术之多

1. conv2函数. C=conv2(A,B,shape); %卷积滤波 参数说明： A：输入图像. B：卷积核 shape的可选值为full、same、valid。 1）当shape=full时，返回全部 ...

#40. Replicate MATLAB's `conv2()` Using Fourier Domain ...

I would like to take two images and convolve them together in Matlab using the 2D FFT without recourse to the conv2 function. However, I am uncertain with ...

#41. MATLAB conv2卷积的实现(代码片段) - linux常用命令大全

二维卷积的算法原理比較简单，參考随意一本数字信号处理的书籍，而matlab的conv2函数的滤波有个形状參数，用以下的一张图非常能说明问题：这里给出一 ...

#42. 圖像處理中任意核卷積(matlab中conv2函數)的快速實現。

在matlab中有幾個函數都與圖像卷積有關，比如imfilter就可以實現卷積，或者conv2也行，他們的速度都是相當快的，比如3000*3000的灰度圖，卷積矩陣大小 ...

#43. filter2、conv2报错：不支持N维数组 - 弟球嗑学

即使你读取的是黑白图像，它其实还是RGB图像。怎么判断？ 读取一张图片： A=imread('E:\MATLAB学习\qie.jpg');.

#44. The difference between conv2, filter2, imfilter and ... - TitanWolf

assume that the size of the input image A is ma x na and the size of the convolution kernel is mb x nb, The MATLAB conv2 function implementation process is ...

#45. What algorithm is behind convolution in MATLAB? - Quora

[Generalised two-dimensional convolution using MATLAB 'conv2' function is discussed below. The same can be extended to the 'conv' and 'convn' functions used for ...

#46. Re: [問題] conv2()如何轉換- 看板C_and_CPP - 批踢踢實業坊

您好^^ : 小弟最近需要使用到MATLAB裡的conv2()這個函數: 而是在C++裡完成這個動作: 想問看看是否有現成的source code可以直接拿來用: 就像FFT2可以 ...

#47. Solved Using MATLAB's conv2 function, solve the following 2D

Transcribed image text: Using MATLAB's conv2 function, solve the following 2D convolution: 1 1 2 2 1 1 1 1 1 2 2 1 2 1 1 1 2 2 1 1 1 1 1 2 2 Explain in your ...

#48. Implementation of conv2 algorithm? - ResearchGate

i am just new in image processing using matlab and i wrote a code to detect edge using sobel. and now i wanna implement conv2 algorithm ...

#49. Matlab expression : 2D Convolution ==> conv( ) - Daum 블로그

Matlab expression : 2D Convolution ==> conv( ) ... C = conv2(A,B) performs the two-dimensional convolution of matrices A and B , returning the ...

#50. filter2、imfilter的區別及conv2 matlab 代碼 - 开发者知识库

第二部分conv2 matlab 代碼出自： http://www.ilovematlab.cn/thread-291079-1-1.html. 第一部分conv2、filter2、imfilter的區別. （1） conv2函數.

#51. 在OpenCV中的Matlab的Conv2等價物- 優文庫 - UWENKU

我一直在嘗試使用OpenCV進行二維矩陣的卷積。我其實通過了這個代碼http://blog.timmlinder.com/2011/07/opencv-equivalent-to-matlabs-conv2-function/#respond， ...

#52. Matlab difference in conv2, filter2, imfilter of - Programmer ...

Suppose ma x na, convolution kernel size mb x nb, the MATLAB function implementation process is as follows conv2 the input image size A:

#53. 是否有Python等效的MATLAB的conv2函数？ - Thinbug

标签： python matlab matrix convolution. Python或其任何模块是否具有MATLAB conv2函数的等价物？更具体地说，我对在MATLAB中执行与 conv2(A, B, 'same') 相同的计算 ...

#54. Conv2 music - Carson Lee

BestMp3Converter is a free youtube converter to convert youtube videos to MP3 format in high quality up to 320 kbps. conv2 is a MATLAB function. max_pool2d ...

#55. Smoothing filter matlab

Image Smoothing and Sharpening Matlab Projects intend to filter out the tricky ... Two-dimensional linear filtering is implemented in Matlab with conv2.

#56. Can convolution in C++ faster than MATLAB conv2?

I use opencv filter 2d but it shows slow than MATLAB, and then I write my own ... machine with more threads, I can achieve the same speed as MATLAB(conv2).

#57. Conv3d matlab

而在'channels_last'模式下，3D卷积输入应为形如（samples，input_dim1，input_dim2, input_d Sep 20, 2020 · In matlab for convolution 'conv' statement is used.

#58. Kernel image processing matlab

Use the kernel as mentioned below MATLAB functions, meshgrid and conv2, and functions for loading and displaying images from the MATLAB Image Processing ...

#59. Matlab plot cfit linewidth - Capital Techinical service & Trading ...

matlab plot cfit linewidth Select the China site (in Chinese or English Je ... 我可以将存储的变量加载到内存中吗？ matlab - 不支持使用conv2 N-D阵列时出错. g.

#60. 2d fft image

Replicate MATLAB's conv2() in Frequency Domain. !/, where: F. in image Processing , I compute the 2D Fourier transform of the image , Is the zero frequency ...

#61. Accelerating MATLAB Performance: 1001 tips to speed up ...

1001 tips to speed up MATLAB programs Yair M. Altman. convnfft utility is based on the convolution theorem (Conv(a,b) = ifft(fft(a)*fft(b))).843 It is ...

#62. 1d fourier transform matlab

2D Fast Fourier Transform Matlab Code. fft module may look intimidating at first ... (1D tensor of N points) = 2D convolution MATLAB function: C = CONV2(A, ...

#63. Matlab cla

... length plotdemo sg100 wow conv gallery MATLAB evaluates the list box's callback routine after any mouse button up event that changes the Value property.

#64. Visual Media Processing Using Matlab Beginner's Guide

O 6 Default usage ('full') >> con2 I conv2(img,kernel,'same'); ... To be on the safe side, you might want to use the suggestion by MATLAB and convert your ...

#65. Digital Signal Processing with Matlab Examples, Volume 2: ...

... 1 % 1 scale wavelet transform of rows lfg1=conv2 (fg, h0); %low-pass filtering of rows lfg1=lfg1 ( : , 2:2: end); %downsampling to get L hfg1=conv2 (fg, ...

#66. Matlab cla - OUTmuscle

... length plotdemo sg100 wow conv gallery MATLAB evaluates the list box's callback routine after any mouse button up event that changes the Value property.

#67. 2d fft image

On this page, I will show my matlab code for taking advantage of the DFT (discrete fourier transform) to ... Replicate MATLAB's conv2() in Frequency Domain.

#68. Matlab ndgrid - CGI Design

Use MATLAB and cylindrical coordinates to sketch the surface defined by the equation `y=2 sqrt(x^2+z^2)`. ogrid ... Analog of MATLAB's conv2 in Mathematica?

#69. Transform matrix matlab - Index of

I need matlab syntax to transform a linear system Ax=b to strictly diagonally dominant matrix. ... This task can be achieved using imfilter () or conv2 ().

#70. Convolution theorem examples

In MATLAB the inbuilt function “conv2” also uses the same technique to perform convolution. (v) Convolution theorem: for any , equation satisfies where ...

#71. Second derivative matlab gradient

second derivative matlab gradient Then, the gradient (vector) off (z) with respect to x ... gx) MATLAB: filter2(g, f, shape) or conv2(g,f,shape) the second ...

#72. Imresize matlab source code

It can reduce the time of training of a neural network as more is the number Jul 10, 2021 · matlab The built-in function conv2 handles the basic convolution ...

#73. Disp in scilab

One of the main difference is that Matlab uses the character % to write comments, ... and Waves by S. You may have a look at conv2 () and convol2d () a =.

#74. 1d fourier transform matlab

1d fourier transform matlab Note that the zero frequency term appears at position ... (1D tensor of N points) = 2D convolution MATLAB function: C = CONV2(A, ...

#75. implementation of cifar10 multi classification by pytoch

MaxPool2d(kernel_size=2,stride=2) self.conv2 = nn.Conv2d(in_channels=16,out_channels=36,kernel_size=3,stride=1) self.pool2 = nn.

#76. Disp in scilab

You may have a look at conv2 () and convol2d () a =. 3 1. Scilab Interfacing Scilab Interface With C. Source code archive. Matlab and Scilab are very ...

#77. Matlab filter image

matlab filter image C Indian Institute of Technology Madras. ... to give you an idea: conv2, filter2, any among the list available under Image Filtering.

#78. Second derivative matlab gradient

second derivative matlab gradient Think about it. ... gx) MATLAB: filter2(g, f, shape) or conv2(g,f,shape) the second derivative of the image intensity [5].

#79. Edge detection in image processing python code - House of ...

... the x -axis gradients of I, you convolve I with Gx using the conv2 function. ... Matlab implementation of Canny edge detection algorithm from scratch.

#80. Matlab simulink to c converter

matlab simulink to c converter Compatible means that if you can specify text as a character vector ... 114BLUE), and then filter their images using conv2 .

#81. Disp in scilab

Matlab and Scilab are very similar languages. Scilab is an invaluable tool as solved problems need ... You may have a look at conv2 () and convol2d () a =.