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Can anyone explain the loops in this code?

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SURILA GUGLANI
SURILA GUGLANI 2018-5-27
关闭： MATLAB Answer Bot 2021-8-20
figure(2)
file1='Frame_0001.png';%Reference
I=imread(file1);
imshow(I)
J=rgb2gray(I);
K=imresize(J, [500 500]);
figure(3)
file2='Frame_0242.png';
P=imread(file2);
imshow(P)
Q=rgb2gray(P);
R=imresize(Q,[500 500]);
bbox1=edge(K,'canny');
bbox2=edge(R,'canny');
matched_data1=0;
matched_data2=0;
white_points=0;
black_points=0;
for a=1:1:500
for b=1:1:500
if (bbox1(a,b)==1)
white_points=white_points+1;
else
black_points=black_points+1;
end
end
end
for i=1:1:500
for j=1:1:500
if (bbox2(i,j)==1)
matched_data1=matched_data1+1;
else
matched_data2=matched_data2+1;
end
end
end
total_data=white_points;
matched_data=matched_data1;
traffic_density_percentage=abs((((matched_data-total_data)/total_data)*100)*6.5);
figure(4)
if (traffic_density_percentage>=0) && (traffic_density_percentage<15)
instruc = 'Zero Traffic, Green Light for 15 seconds';
display=insertObjectAnnotation(R, 'rectangle', [0 450 0 0], instruc);
imshow(display);
elseif (traffic_density_percentage>=15) && (traffic_density_percentage<32)
instruc = 'Low Traffic, Green Light for 40 seconds';
display=insertObjectAnnotation(R, 'rectangle', [0 450 0 0], instruc);
imshow(display);
elseif (traffic_density_percentage>=32) && (traffic_density_percentage<70)
instruc = 'Moderate Traffic, Green Light for 60 seconds';
display=insertObjectAnnotation(R, 'rectangle', [0 450 0 0], instruc);
imshow(display);
else (traffic_density_percentage >=70)
instruc = 'Heavy Traffic, Green Light for 90 seconds';
display=insertObjectAnnotation(R, 'rectangle', [0 450 0 0], instruc);
imshow(display);
end
print('first','-dpng','-r300');

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回答（1 个）

sloppydisk
sloppydisk 2018-5-27
编辑：sloppydisk 2018-5-27
They're counting the number of white points, black points and matched data, but they could be replaced by using logical indexing, (for example for the first one):
white_points = sum(bbox1);
black_points = sum(~bbox1);

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