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2014-04-15 回答

specfun工具箱没装可能

给你个rgb2hsv源代码 复制下来同名保存就能用了

function [h,s,v] = rgb2hsv(r,g,b)

switch nargin

case 1,

if isa(r, 'uint8'),

r = double(r) / 255;

elseif isa(r, 'uint16')

r = double(r) / 65535;

end

case 3,

if isa(r, 'uint8'),

r = double(r) / 255;

elseif isa(r, 'uint16')

r = double(r) / 65535;

end

if isa(g, 'uint8'),

g = double(g) / 255;

elseif isa(g, 'uint16')

g = double(g) / 65535;

end

if isa(b, 'uint8'),

b = double(b) / 255;

elseif isa(b, 'uint16')

b = double(b) / 65535;

end

otherwise,

error('MATLAB:rgb2hsv:WrongInputNum', 'Wrong number of input arguments.');

end

threeD = (ndims(r)==3); % Determine if input includes a 3-D array

if threeD,

g = r(:,:,2); b = r(:,:,3); r = r(:,:,1);

siz = size(r);

r = r(:); g = g(:); b = b(:);

elseif nargin==1,

g = r(:,2); b = r(:,3); r = r(:,1);

siz = size(r);

else

if ~isequal(size(r),size(g),size(b)),

error('MATLAB:rgb2hsv:InputSizeMismatch', 'R,G,B must all be the same size.');

end

siz = size(r);

r = r(:); g = g(:); b = b(:);

end

v = max(max(r,g),b);

h = zeros(size(v));

s = (v - min(min(r,g),b));

z = ~s;

s = s + z;

k = find(r == v);

h(k) = (g(k) - b(k))./s(k);

k = find(g == v);

h(k) = 2 + (b(k) - r(k))./s(k);

k = find(b == v);

h(k) = 4 + (r(k) - g(k))./s(k);

h = h/6;

k = find(h < 0);

h(k) = h(k) + 1;

h=(~z).*h;

k = find(v);

s(k) = (~z(k)).*s(k)./v(k);

s(~v) = 0;

if nargout<=1,

if (threeD || nargin==3),

h = reshape(h,siz);

s = reshape(s,siz);

v = reshape(v,siz);

h=cat(3,h,s,v);

else

h=[h s v];

end

else

h = reshape(h,siz);

s = reshape(s,siz);

v = reshape(v,siz);

end