📄 关于车牌定位的色彩提取程序.mht
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[y_image] =3D extract_yellow_region(image);<BR>%=20
extract_yellow_region: Determines the yellow regions in the =
picture=20
using<BR>% the CIE-XYZ color system, and returns a black and =
white=20
picture which is<BR>% set on the yellow regions =
only.<BR><BR>%=20
Define the lines in CIE-XYZ space, use to determine yellow =
color=20
<BR>lower_A =3D 0.87; lower_B =3D 0.04;<BR>upper_A =3D 1.5 ; =
upper_B =3D=20
-0.125;<BR><BR>% Convert 8-bit format of org_pic pixels to =
double=20
format<BR>pic =3D double(image)+1;<BR>pic =3D =
pic.*1.6;<BR><BR>%=20
Conversion from RGB709 to CIE-XYZ<BR>x =3D ( =
pic(:,:,1).*0.412453 +=20
pic(:,:,2).*0.35758 + pic(:,:,3).* 0.180423);<BR>y =3D (=20
pic(:,:,1).*0.212671 + pic(:,:,2).*0.715160 + pic(:,:,3).*=20
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