Question

MATLAB中怎样改变背景的颜色

function imageMatrix = image1(input,output)
rgb_image = imread(input);
R = rgb_image( : , : , 1 );
G = rgb_image( : , : , 2 );
B = rgb_image( : , : , 3 );
for R = 1:rgb_image(1)
for G = 1:rgb_image(2)
for B = 1:rgb_image(3)
if R>250 & G>250 & B>250;
R = 0
G = 0
B = 255
end
end
end
end
imwrite(rgb_image,output)
想要把像素表示成RGB矩阵，判定为白色的就将他变为蓝色，应该怎么for循环？

Answer 1

function imageMatrix = image1(input,output)
rgb_image = imread(input);
[a,b,c]=size(rgb_image);
for i= 1:a
for j= 1:b
if rgb(i,j,1)==255&&rgb(i,j,2)==255&& rgb(i,j,3)==255
rgb_image(i,j,1)=0
rgb_image(i,j,2)=0
rgb_image(i,j,3)=255
end
end
end
imshow(rgb_image)

Answer 2

for R = 1:rgb_image(1)
for G = 1:rgb_image(2)
for B = 1:rgb_image(3)
if R>250 & G>250 & B>250;
R = 0
G = 0
B = 255
end
end
end
end

改为:
II=find(R>250 &G>250 &B>250);
R(II)=0;
G(II)=0;
B(II)=0;
试试