How to read and pre-process the multiple images and write in specific location?

Question

Regina N 2019-2-11

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/444308-how-to-read-and-pre-process-the-multiple-images-and-write-in-specific-location

评论： Regina N 2019-2-14

function preprocessing_multiple
srcFiles = dir('C:\Users\LENOVO\Desktop\Genuine\1\*.png');  % the folder in which ur images exists
for i = 1 : length(srcFiles)
    filename = strcat('C:\Users\LENOVO\Desktop\Genuine\1\',srcFiles(i).name);
    I = rgb2gray(imread(filename));
    imshow(I)
    I2=medfilt2(I);
    figure,imshow(I2)
imwrite(I2,fullfile('C:\Users\LENOVO\Desktop\','*.png'));
end

I got error in above code:

Error using imwrite (line 454)

Unable to open file "C:\Users\LENOVO\Desktop\*.png" for writing. You may not

have write permission.

Error in preprocessing_multiple (line 11)

imwrite(I2,fullfile('C:\Users\LENOVO\Desktop\','*.png'));

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Walter Roberson 2019-2-11

Every iteration you are trying to write to the same file whose name is literally *.png

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Geoff Hayes 2019-2-11

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/444308-how-to-read-and-pre-process-the-multiple-images-and-write-in-specific-location#answer_360497

在 MATLAB Online 中打开

Regina - in your line of code

imwrite(I2,fullfile('C:\Users\LENOVO\Desktop\','*.png'));

which file are you trying to write to? You are not specifying a file name and are instead using the wildcard character. Try changing the above line of code so that you explicitly set the filename to which you want to write the I2 data to.

3 个评论
显示 1更早的评论隐藏 1更早的评论

Geoff Hayes 2019-2-13

在 MATLAB Online 中打开

Regina - look closely at your code

for i = 1 : length(srcFiles)
    filename = strcat('C:\Users\LENOVO\Desktop\Genuine\1\',srcFiles(i).name);
    I = rgb2gray(imread(filename));
    imshow(I)
    I2=medfilt2(I);
    figure,imshow(I2)
    imwrite(I2,fullfile('C:\Users\LENOVO\Desktop\','*.png'));
end

The code is looping over all of the files that you have found, reading the file, doing some processing, and then (trying) to write to an incorrectly named file. So you won't be able to save all the preprocessed images in one line code. Instead, you can save each preprocessed file one at a time by replacing

imwrite(I2,fullfile('C:\Users\LENOVO\Desktop\','*.png'));

with

imwrite(I2,fullfile('C:\Users\LENOVO\Desktop\', srcFiles(i).name));

The above assumes that you want to write to a file with the same name as the original file (just in a different folder).

Regina N 2019-2-14

Actually i am new to matlab....so....bt thank you so much for helping me..it works..thanx again

请先登录，再进行评论。

How to read and pre-process the multiple images and write in specific location?

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

采纳的回答

3 个评论
显示 1更早的评论隐藏 1更早的评论

更多回答（0 个）

另请参阅

类别

标签

Community Treasure Hunt

How to read and pre-process the multiple images and write in specific location?

1 个评论 显示 -1更早的评论隐藏 -1更早的评论

采纳的回答

3 个评论 显示 1更早的评论隐藏 1更早的评论

更多回答（0 个）

另请参阅

类别

标签

Community Treasure Hunt

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

3 个评论
显示 1更早的评论隐藏 1更早的评论