How can I use a grayscale image as a input in this piece of code?

Question

FS 2017-8-3

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/351460-how-can-i-use-a-grayscale-image-as-a-input-in-this-piece-of-code

评论： Image Analyst 2017-8-4

function RedCellCount(dataImg)
  data = imread(dataImg.Key{1});
  diff_im = imsubtract(data(:,:,1), rgb2gray(data));
  diff_im = medfilt2(diff_im, [3 3]);
  diff_im = imbinarize(diff_im,0.18);
  diff_im = bwareaopen(diff_im,300);
    bw = bwlabel(diff_im, 8);
    stats = regionprops(bw, 'BoundingBox', 'Centroid');
    fileName = dataImg.Key{1};
    display(fileName)
    display(length(stats));

I'm trying to load grayscale images in this piece of code from a folder whose path is in another .m file. This piece of code works perfectly fine for RGB images. but when i'm trying to use grayscale images its popping up with these errors:

   >> RedCellCount
      Not enough input arguments.
      Error in RedCellCount (line 2)
      data = imread(dataImg.Key{1});

and while using mapreduce() for grayscale images in another function, I got this error.

>> MAP must be a m x 3 array.

I've tried everything to make it run but the program is not accepting grayscale images as it is 1-D whereas RGB images are 3-D matrices.

I'm not able to understand why imread() is working for RGB images but not for grayscale images.

data = imread(dataImg.Key{1});

Any help will be highly appreciated. Thanks in advance.

4 个评论
显示 2更早的评论隐藏 2更早的评论

Geoff Hayes 2017-8-4

FS - how about you show the full error message when your other function tries to pass the grayscale image into RedCellCount? If it is already an image (like you say) then you cannot pass it to RedCellCount since it is assuming that you are passing in a struct that has a filename. You will need to adapt the code to the new (grayscale image) input parameter.