how to fill a binary image from bottom to top? i'm trying using imfill but the output is wrong. The second picture is want i want.

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Nurul Najmah 2015-4-2

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https://ww2.mathworks.cn/matlabcentral/answers/195782-how-to-fill-a-binary-image-from-bottom-to-top-i-m-trying-using-imfill-but-the-output-is-wrong-the

回答： Nurul Najmah 2015-4-2

采纳的回答： Nurul Najmah

在 MATLAB Online 中打开

clear all;close all;

%Load and Read Image object = imread('kotak.jpg');

%Resize the image by pixels obstacle= imresize(object,[100 150]);

%Sobel Edge Detection Igray = rgb2gray(obstacle); Iedge = im2uint8(edge(Igray,'sobel',0.05)); Iedge = repmat(Iedge,[1 1 3]); Ifinal = obstacle + Iedge;

%Convert to Grayscale Image & %Sobel gradient mask G = rgb2gray(Ifinal); C=double(G);

for i=1:size(C,1)-2 for j=1:size(C,2)-2 %Sobel mask for x-direction: Gx=((2*C(i+2,j+1)+C(i+2,j)+C(i+2,j+2))-(2*C(i,j+1)+C(i,j)+C(i,j+2))); %Sobel mask for y-direction: Gy=((2*C(i+1,j+2)+C(i,j+2)+C(i+2,j+2))-(2*C(i+1,j)+C(i,j)+C(i+2,j)));

        %The gradient of the image
        %B(i,j)=abs(Gx)+abs(Gy);
        G(i,j)=sqrt(Gx.^2+Gy.^2);
    end
end

%Adjust the brightness of Grayscale Image A = imadjust(G)

%Convert the Sobel Edge Detection Grayscale adjusted image to binary image level = graythresh(A); BW = im2bw(A,level); BW = bwareaopen(BW, 50);

% fill against the bottom and left borders. bw_d = padarray(padarray(BW,[1 0],1,'post'),[0 1],1,'pre'); bw_d_filled = imfill(bw_d,'holes'); bw_d_filled = bw_d_filled(1:end-1,2:end);

% allocate space for thresholded image loop = zeros(size(BW));

% loop over all rows and columns for ii=1:size(BW,1) for jj=1:size(BW,2) % get pixel value pixel=BW(ii,jj); % check pixel value and assign new value if pixel==0 new_pixel=1; else pixel==1; new_pixel=0;

          end
          % save new pixel value in thresholded image
          loop(ii,jj)=new_pixel;
      end
end

%Flood fill binary image of Sobel Edge Detection flood = imcomplement(imfill(imcomplement(loop),'holes'));

%"logical OR" all these images together. bwfilled =flood & bw_d_filled;

%Dilate image of Binary Sobel Edge Detection se = strel('line',11,90); dilation=imdilate(bwfilled,se);

% Display result figure; subplot (331); imshow(obstacle); title('Original Image'); subplot (332); imshow(Ifinal); title('Sobel Edge RGB'); subplot(333); imshow(G); title('Grayscale+Sobel Gradient Mask'); subplot(334); imshow(A); title('Brightness'); subplot(335); imshow(BW); title('Sobel Edge Binary'); subplot(336); imshow(bw_d_filled); title('Bottom Fill Left Image'); subplot(337); imshow(flood); title('Flood Image'); subplot(338); imshow(bwfilled); title('Fill Image');

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