selecting an image from folder

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kash 2011-12-22

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/24562-selecting-an-image-from-folder

I have 30 images in a folder,I have to select only21st image from it,please help,i tried this code but only first image is shown

I have 30 images in folder named photos

     path='D:\photos\';
    files=dir(strcat(path,'*.jpg'))
      for k=1:numel(files(21))%numel(files)
        file_name=files(k).name;
        image_name=strcat(path,file_name);
      I=imread(image_name);
      figure,imshow(I)
      end

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kash 2011-12-29

chandra can u tell how to select 1st,6tf,11th,16th,21st,26th images and storing them in folder

Image Analyst 2011-12-29

Look up the mod() function to take every 5th one.

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Chandra Kurniawan 2011-12-22

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/24562-selecting-an-image-from-folder#answer_32255

在 MATLAB Online 中打开

path='D:\photos\';
jpeg_files = dir(fullfile(path,'*.jpg'));
for cnt = 1 : 21
    I{cnt} = imread(fullfile(path,jpeg_files(cnt).name));     
    figure,imshow(I{cnt});
end

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Chandra Kurniawan 2011-12-22

Can you show me about 'feature vector of query image' and 'feature vector that you saved in your .MAT file?

kash 2011-12-22

Feature vector is [1x359double]od 1row and 80 colomns

have i have to extract same feature vector for query image and store in .mat file for retrieving the image

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Chandra Kurniawan 2011-12-22

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/24562-selecting-an-image-from-folder#answer_32268

在 MATLAB Online 中打开

Then you just need to pass your feature vector 1x80 and

feature vector of query image in

suppose that dataset1 is feature vector 1x80

dataset2 is feature vector of query image

function D = DistEuclidian(dataset1, dataset2)
[m1 n1] = size(dataset1);
[m2 n2] = size(dataset2);
D = zeros(m1, m2);
for i = 1 : m1          
    for j = 1 : m2
        D(i, j) = sqrt((dataset1(i, 1) - dataset2(j, 1)) ^ 2 + ...
                       (dataset1(i, 2) - dataset2(j, 2)) ^ 2);
    end
end

And you'll get the Distance matrix.

Then make a limit. If all values in Distance matrix lower than your limit,

We can say that your query image is match with feature vector 1x80

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kash 2011-12-28

i have dataset of 80 numbers=[1:1:80]

now i want to take first 8 values ,multiply each value by 2 and divide each by 2,so i will have 8 values each for multiplication and division,and then want to find average for that multilaction values and division values,same way i eant to perform for those 80 values from 1st 8,2nd 8,3rd 8........10th8 please help