Reading images from a folder when a particular condition holds true

Question

shru s 2017-6-7

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/343639-reading-images-from-a-folder-when-a-particular-condition-holds-true

评论： shru s 2017-6-7

Hello, suppose i have a folder containing a set of images. In a for loop, every time condition A is true i want a blank image and every time condition B is true i would like one image from the sequence of images in my folder.

   for x=1:c
                   if (c > 440)
                         c=1;
                         figure;
                   else if (c < 440)
                          Img = imread(fullfile(folderName, Imgs(j).name));
                                  j=j+1;
                       end
                   end
             end

This is what i have tried. Can you tell me how its done?

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KSSV 2017-6-7

What problem you face with the above code?

shru s 2017-6-7

编辑：shru s 2017-6-7

在 MATLAB Online 中打开

this is the error message -

Index exceeds matrix dimensions.
    Error in program (line 62)
                            Img = imread(fullfile(folderName, Imgs(j).name));

do u know how i can fix this?

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Answer 1

KSSV 2017-6-7

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/343639-reading-images-from-a-folder-when-a-particular-condition-holds-true#answer_269828

编辑：KSSV 2017-6-7

在 MATLAB Online 中打开

It is because..your j is more then the number of images present...you have to break the loop, if j increases.

N = length(Imgs) ;
for x=1:c
    if (c > 440)
        c=1;
        figure;
    else if (c < 440)
            Img = imread(fullfile(folderName, Imgs(j).name));
            j=j+1;
            if j >= N
                break
            end
        end
    end
end

Note that, there are better ways to do this.

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KSSV 2017-6-7

What error? It is not showing any error here..

shru s 2017-6-7

在 MATLAB Online 中打开

close all
img1=imread('C:\Users\Shruthi\Desktop\project\A data\is.jpg');
imshow(img1);
figure;
img1=rgb2gray(img1);
imhist(img1);
threshold=120;
binaryImage = img1 < threshold;
figure;
imshow(binaryImage);
image = bwareaopen(binaryImage,30);
% image= ~image;
figure;
imshow(image);
vp=sum(image,1)
hp=sum(image,2);
plot(vp,'b');
figure;
[le , br ] = size(image);
    darkpixels=hp<1; 
    [lableledregions noofregions]= bwlabel(darkpixels);
    fprintf('number of regions =%d\n',noofregions);
   z=min(vp);
   s=find(vp>z)
  e=find(vp==z)
   letterLocations = vp > z;
d = diff(letterLocations);
startingColumns = find(d>0);
endingColumns = find(d<0);
 folderName = 'C:\Users\p\project\A data\SegmentedCharacters'; 
Imgs = dir(fullfile(folderName, '*.jpg'));
   y=length(vp');
  plot(hp,'r');
c=1;
for j=1:y
    if vp(j)==z
         c = c + 1;
N = length(Imgs) ;
for x=1:c
    if (c > 440)
        c=1;
        figure;
    else if (c < 440)
            Img = imread(fullfile(folderName, Imgs(j).name));
            j=j+1;
            if j >= N
                break
            end
        end
    end
end
    end
end