新建文件夹.rar_Matlab旋转色域_hsi_图像色域转换功能大全_色域图

function rgb = hsi2rgb(hsi) % rgb = hsi2rgb(hsi)把一幅HSI图像转换为RGB图像， % 其中hsi(:, :, 1)是色度分量，它的范围是除以2*pi后的[0, 1]； % hsi(:, :, 2)是饱和度分量，范围是[0, 1]； % hsi(:, :, 3)是亮度分量，范围是[0, 1]。 % % 输出图像分量： % rgb(:, :, 1)为红； % rgb(:, :, 2)为绿； % rgb(:, :, 3)为蓝。 % 抽取图像分量 hsi = im2double(hsi); H = hsi(:, :, 1) * 2 * pi; S = hsi(:, :, 2); I = hsi(:, :, 3); % 执行转换方程 R = zeros(size(hsi, 1), size(hsi, 2)); G = zeros(size(hsi, 1), size(hsi, 2)); B = zeros(size(hsi, 1), size(hsi, 2)); % RG扇形(0 <= H < 2*pi/3) idx = find( (0 <= H) & (H < 2*pi/3)); B(idx) = I(idx) .* (1 - S(idx)); R(idx) = I(idx) .* (1 + S(idx) .* cos(H(idx)) ./ ... cos(pi/3 - H(idx))); G(idx) = 3*I(idx) - (R(idx) + B(idx)); % BG扇形(2*pi/3 <= H < 4*pi/3) idx = find( (2*pi/3 <= H) & (H < 4*pi/3) ); R(idx) = I(idx) .* (1 - S(idx)); G(idx) = I(idx) .* (1 + S(idx) .* cos(H(idx) - 2*pi/3) ./ ... cos(pi - H(idx))); B(idx) = 3*I(idx) - (R(idx) + G(idx)); % BR扇形 idx = find( (4*pi/3 <= H) & (H <= 2*pi)); G(idx) = I(idx) .* (1 - S(idx)); B(idx) = I(idx) .* (1 + S(idx) .* cos(H(idx) - 4*pi/3) ./ ... cos(5*pi/3 - H(idx))); R(idx) = 3*I(idx) - (G(idx) + B(idx)); % 将3个分量联合成为一个RGB图像 rgb = cat(3, R, G, B); rgb = max(min(rgb, 1), 0);