function?colorhist?=?CBIR_colorhist（rgb）
%?EE6850?HW3?Content-based?Image?Retrieval
%?CBIR_colorhist（）?---?color?histogram?calculation
%?input:
%???MxNx3?image?data?in?RGB
%?output:
%???1x256?colorhistogram?<==?（HxSxV?=?16x4x4）
%?as?the?MPEG-7?generic?color?histogram?descriptor
%?[Ref]?Manjunath?B.S.;?Ohm?J.-R.;?Vasudevan?V.V.;?Yamada?A.?“Color?and?texture?descriptors“?
%?IEEE?Trans.?CSVT?Volume:?11?Issue:?6??Page（s）:?703?-715?June?2001?（section?III.B）
%?
%?10-19-2001?xlx@ee.columbia.edu

%?check?input
if?size（rgb3）~=3
????error（‘3?components?is?needed?for?histogram‘）;
end
%?globals
H_BITS?=?4;
S_BITS?=?2;
V_BITS?=?2;
%?convert?to?hsv
hsv?=?uint8（255*rgb2hsv（rgb））;

imgsize?=?size（hsv）;
%?get?rid?of?irrelevant?boundaries
i0=round（0.05*imgsize（1））;??i1=round（0.95*imgsize（1））;
j0=round（0.05*imgsize（2））;??j1=round（0.95*imgsize（2））;
hsv?=?hsv（i0:i1?j0:j1?:）;

%?histogram
for?i?=?1?:?2^H_BITS
????for?j?=?1?:?2^S_BITS
????????for?k?=?1?:?2^V_BITS
????????????colorhist（ijk）?=?sum（sum（?...
????????????????bitshift（hsv（::1）-（8-H_BITS））==i-1?&...
????????????????bitshift（hsv（::2）-（8-S_BITS））==j-1?&...
????????????????bitshift（hsv（::3）-（8-V_BITS））==k-1?））;????????????
????????end????????
????end
end
colorhist?=?reshape（colorhist?1?2^（H_BITS+S_BITS+V_BITS））;
%?normalize
colorhist?=?colorhist/sum（colorhist）;

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????1386??2001-10-26?10:56??CBIR-matlab\CBIR_colorhist.m

?????文件????????501??2001-10-26?12:59??CBIR-matlab\CBIR_cosinedist.m

?????文件???????1914??2001-10-26?23:46??CBIR-matlab\CBIR_edgedirection.m

?????文件???????1679??2001-10-27?03:24??CBIR-matlab\CBIR_edgehist.m

?????文件????????847??2001-10-27?03:40??CBIR-matlab\CBIR_featurecalc.m

?????文件????????760??2001-10-26?13:10??CBIR-matlab\CBIR_histintersection.m

?????文件????????412??2001-10-27?02:23??CBIR-matlab\CBIR_L2dist.m

?????文件???????2349??2001-10-28?04:04??CBIR-matlab\CBIR_Query.m

?????文件???????2754??2001-10-28?03:18??CBIR-matlab\CBIR_Query_minmax.m

?????目錄??????????0??2011-01-16?16:01??CBIR-matlab

-----------?---------??----------?-----??----

????????????????12602????????????????????10