how to apply histogram and median filters for a jpg imag??

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seshi reddy 2014-6-24

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https://ww2.mathworks.cn/matlabcentral/answers/137446-how-to-apply-histogram-and-median-filters-for-a-jpg-imag

评论： Image Analyst 2020-4-1

采纳的回答： Image Analyst

在 MATLAB Online 中打开

when i apply to the image it is showing error

Error using medfilt2
Expected input number 1, A, to be two-dimensional.
Error in medfilt2>parse_inputs (line 110)
validateattributes(a, {'numeric','logical'}, {'2d','real'}, mfilename, 'A', 1);
Error in medfilt2 (line 47)
[a, mn, padopt] = parse_inputs(varargin{:});
Error in medhistfilter (line 7)
m=medfilt2(pic);

how do i overcome this??

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Image Analyst 2014-6-24

Sorry, I don't see in your code where you area extracting one color channel or are calling rgb2gray(). Where is that?

seshi reddy 2014-6-24

在 MATLAB Online 中打开

clear;
clc;
pic=imread('C:\masters courses\applications of dsp\project2\GW_1200.jpg');
grayImage = rgb2gray(pic);
subplot(3,3,1);
imshow(grayimage);
title('original image');
m=medfilt2(grayimage);
subplot(3,3,2);
imshow(m);
title('Median Fileter of image');
a10=histeq(grayimage);
subplot(3,3,3);
imshow(a10);
title('Histogram equalization of image');

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Image Analyst 2014-6-24

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在 MATLAB Online 中打开

pic is probably a color image. Either take one of the color channels

oneChannel = pic(:,:,2); % Take green channel.

or convert to gray scale

grayImage = rgb2gray(pic);

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Abdulmu'min Musa 2020-4-1

Thanks, but what i mean here is that i dont want to use the "subplot" code but the "figure" code, so that each of the image will be displayed seperately.

I want to create a new figure window to display the gray image, another figure window to display median filtered image and another figure window to display histogram equalized image.

Pls help. Thanks

Image Analyst 2020-4-1

在 MATLAB Online 中打开

Well just make the obvious change to replace subplot with figure;

figure; % Bring up an empty, new figure window.
imshow(grayImage); % Show original image
figure; % Bring up an empty, new figure window.
imshow(medianImage); % Show median filtered image
figure; % Bring up an empty, new figure window.
imshow(equalizedImage); % Show histogram equalized image