matlab学习总结01 |
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matlab学习总结01
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matlab对文件夹下的所有图片按顺序读取、处理和保存 方法1：使用imwrite 原理：读取出图片，明白图片个数k，for i=1:k 使用imwrite保存（以k命名即可） I0 = imread('F:\lystudy\matlabstudy\a图像分割获取运动区域\opticalflow\mask\固定mask\左右分离.jpg'); %使用dir将路径下.jpg格式的图片取出。img_dir为结构体类型 img_dir = dir('F:\lystudy\matlabstudy\a图像分割获取运动区域\opticalflow\static_video\3run\02\*.jpg'); img_dir1=sort_nat({img_dir.name}); %img_dir.name取出文件名，sort_nat 文件名排序 [m n]=size(img_dir1); for i=1:n name=strcat('F:\lystudy\matlabstudy\a图像分割获取运动区域\opticalflow\static_video\3run\02\',img_dir1{1,i}); I=imread(name); V = bitand(I0,I); %figure(1);imshow(V);title('第i帧按位与结果') %避免显示过多，注释掉 %循环保存图片，利用path和imwrite实现 path =[ 'F:\lystudy\matlabstudy\a图像分割获取运动区域\opticalflow\static_video\3run\全部帧按位与结果\',num2str(i),'.jpg']; imwrite(V,path,'jpg'); end其中sort_nat为别人写好的函数，可直接调用。具体如下： function [cs,index] = sort_nat(c,mode) %sort_nat: Natural order sort of cell array of strings. % usage: [S,INDEX] = sort_nat(C) % % where, % C is a cell array (vector) of strings to be sorted. % S is C, sorted in natural order. % INDEX is the sort order such that S = C(INDEX); % % Natural order sorting sorts strings containing digits in a way such that % the numerical value of the digits is taken into account. It is % especially useful for sorting file names containing index numbers with % different numbers of digits. Often, people will use leading zeros to get % the right sort order, but with this function you don't have to do that. % For example, if C = {'file1.txt','file2.txt','file10.txt'}, a normal sort % will give you % % {'file1.txt' 'file10.txt' 'file2.txt'} % % whereas, sort_nat will give you % % {'file1.txt' 'file2.txt' 'file10.txt'} % % See also: sort % Version: 1.4, 22 January 2011 % Author: Douglas M. Schwarz % Email: dmschwarz=ieee*org, dmschwarz=urgrad*rochester*edu % Real_email = regexprep(Email,{'=','*'},{'@','.'}) % Set default value for mode if necessary. if nargin < 2 mode = 'ascend'; end % Make sure mode is either 'ascend' or 'descend'. modes = strcmpi(mode,{'ascend','descend'}); is_descend = modes(2); if ~any(modes) error('sort_nat:sortDirection',... 'sorting direction must be ''ascend'' or ''descend''.') end % Replace runs of digits with '0'. c2 = regexprep(c,'\d+','0'); % Compute char version of c2 and locations of zeros. s1 = char(c2); z = s1 == '0'; % Extract the runs of digits and their start and end indices. [digruns,first,last] = regexp(c,'\d+','match','start','end'); % Create matrix of numerical values of runs of digits and a matrix of the % number of digits in each run. num_str = length(c); max_len = size(s1,2); num_val = NaN(num_str,max_len); num_dig = NaN(num_str,max_len); for i = 1:num_str num_val(i,z(i,:)) = sscanf(sprintf('%s ',digruns{i}{:}),'%f'); num_dig(i,z(i,:)) = last{i} - first{i} + 1; end % Find columns that have at least one non-NaN. Make sure activecols is a % 1-by-n vector even if n = 0. activecols = reshape(find(~all(isnan(num_val))),1,[]); n = length(activecols); % Compute which columns in the composite matrix get the numbers. numcols = activecols + (1:2:2*n); % Compute which columns in the composite matrix get the number of digits. ndigcols = numcols + 1; % Compute which columns in the composite matrix get chars. charcols = true(1,max_len + 2*n); charcols(numcols) = false; charcols(ndigcols) = false; % Create and fill composite matrix, comp. comp = zeros(num_str,max_len + 2*n); comp(:,charcols) = double(s1); comp(:,numcols) = num_val(:,activecols); comp(:,ndigcols) = num_dig(:,activecols); % Sort rows of composite matrix and use index to sort c in ascending or % descending order, depending on mode. [unused,index] = sortrows(comp); if is_descend index = index(end:-1:1); end index = reshape(index,size(c)); cs = c(index);方法2：使用Windows自带函数rename 注：该方法只适用于Windows下的matlab，ubuntu下请使用方法1。 代码截图如下：
处理完结果如下图 https://blog.csdn.net/paoxungan5156/article/details/107006982?utm_medium=distribute.pc_relevant.none-task-blog-OPENSEARCH-4.control&depth_1-utm_source=distribute.pc_relevant.none-task-blog-OPENSEARCH-4.control |
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