2
爲什麼下面的顏色過濾器找不到青椒?顏色通過色調過濾器
的代碼:
function [ outhsv ] = ColorFilter(hsv, h, s)
%COLORFILTER Summary of this function goes here
% Detailed explanation goes here
if nargin < 2
h = [];
end
if nargin < 3
s = [];
end
if size(h,2)==1
h = padarray(h, [0 1], 1/100, 'post');
end
if size(s,2)==1
s = padarray(s, [0 1], 1/100, 'post');
end
if isempty(h)
v_of_h = ones(size(hsv,1), size(hsv,2));
else
v_of_h = WeightFunction(hsv(:,:,1), h(:,1), h(:,2));
end
if isempty(s)
v_of_s = ones(size(hsv,1), size(hsv,2));
else
v_of_s = WeightFunctionOnce(hsv(:,:,2), s(:,1), s(:,2));
end
outhsv = hsv;
outhsv(:,:,3) = hsv(:,:,3) .* v_of_h .* v_of_s;
function y = WeightFunction(x, mu, sigma)
%y = WeightFunctionOnce(x,mu,sigma) + WeightFunctionOnce(x-1,mu,sigma);
y = 1 - (1-WeightFunctionOnce(x,mu,sigma)) .* (1-WeightFunctionOnce(x-1,mu,sigma));
function y = WeightFunctionOnce(x, mu, sigma)
if nargin<2
mu=0;
elseif nargin<3
sigma=1./100.;
end
if any(size(mu) ~= size(sigma))
error('mu and sigma should be of the same size');
end
y = zeros([size(x) numel(mu)]);
for i=1:numel(mu)
y(:,:,i) = exp(-((x - mu(i)) .^ 2 ./ (2 .* sigma(i) .^ 2)));
end
%y = sum(y,3)/size(y,3);
y = 1-prod(1-y,3);
顯示代碼:在刻度
hue = 120;
h = [hue/360 0.05];
s = [];
rgb1 = imread('huescale.png');
%rgb1 = imread('peppers.png');
hsv1 = rgb2hsv(rgb1);
hsv2 = ColorFilter(hsv1, h, s);
rgb2 = hsv2rgb(hsv2);
bitmask = hsv1(:,:,1)>(h(1)-h(2)) & hsv1(:,:,1)<(h(1)+h(2));
figure;
subplot(3,1,1); imshow(rgb1);
subplot(3,1,2); imshow(rgb2);
subplot(3,1,3); imshow(bitmask);
結果
(作品)
重新SULT對辣椒:
(不)
爲什麼?
我不是圖像處理專家,但我的攝影者眼球的辣椒有很多黃色的,幾乎沒有純綠色。將peppers.png圖像放入Photoshop並在「色相/飽和度」面板中調整圖像即可確認。 – horchler