How to remove error "Integers can only be combined with integers of the same class, or scalar doubles."

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ROMIL 2013-12-25

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/110670-how-to-remove-error-integers-can-only-be-combined-with-integers-of-the-same-class-or-scalar-double

评论： Image Analyst 2013-12-26

采纳的回答： Image Analyst

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When I'm using typecasting my image quality is affected and I'm not getting desired results. Here is my code:

clc
[file path]=uigetfile('*.*');
img=imread(file);
[r c p]=size(img);
[pl1 pl2 pl3 pl4 pl5 pl6 pl7 pl8]=bitplane_slice(img);
figure;
subplot(3,3,1);imshow(pl1);title('pln 1')
subplot(3,3,2);imshow(pl2);title('pln 2')
subplot(3,3,3);imshow(pl3);title('pln 3')
subplot(3,3,4);imshow(pl4);title('pln 4')
subplot(3,3,5);imshow(pl5);title('pln 5')
subplot(3,3,6);imshow(pl6);title('pln 6')
subplot(3,3,7);imshow(pl7);title('pln 7')
subplot(3,3,8);imshow(pl8);title('pln 8')
    sec=imread('ab.png');
    new_sec=imresize(sec,[r c]);
    stego = new_sec+pl2*2+pl3*4+pl4*8+pl5*16+pl6*32+pl7*64+pl8*128;
    figure;
    subplot(1,2,1);imshow(new_sec);title('Sec image')
    subplot(1,2,2);imshow(uint8(stego));title('Stego image')
    [pl1 pl2 pl3 pl4 pl5 pl6 pl7 pl8]=bitplane_slice(stego);
    figure;
    subplot(3,3,1);imshow(pl1);title('pln 1')
    subplot(3,3,2);imshow(pl2);title('pln 2')
    subplot(3,3,3);imshow(pl3);title('pln 3')
    subplot(3,3,4);imshow(pl4);title('pln 4')
    subplot(3,3,5);imshow(pl5);title('pln 5')
    subplot(3,3,6);imshow(pl6);title('pln 6')
    subplot(3,3,7);imshow(pl7);title('pln 7')
    subplot(3,3,8);imshow(pl8);title('pln 8')

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采纳的回答

Image Analyst 2013-12-25

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/110670-how-to-remove-error-integers-can-only-be-combined-with-integers-of-the-same-class-or-scalar-double#answer_119307

Because you're essentially adding two images with the least significant bit of one zeroed out, you're most likely going to get overflow which, for a uint8 image, means that you'll clip at 288. Cast everything to double before summing to avoid the error.