如何分别从HSV图像中提取H s和V.

Question

我正在尝试从HSV图像[1x3]中提取HS和V通道以将其转换为线性空间，不知何故我无法提取它，或者至少在最后我绘制a，b，c时最后我得到一个立方体，我期待一个锥形。

    %hsvToLinearSpace
% Converts a color from Matlab's HSV cube to a linear space (i.e. a cone)
%
%Inputs:
% colorsHsv - [1x3] color in Matlab's HSV space
%
%Outputs:
% colorLinear - [1x3] color in a linear space where Euclidean distances can
% be applied.
function colorLinear=hsvToLinearSpace(colorHsv)
    %---Modify this code---%
    colorLinear(1) = colorHsv(1);
    colorLinear(2) = colorHsv(2);
    colorLinear(3) = colorHsv(3);
    a=colorHsv(2)*colorHsv(3)*cos(2*pi*colorHsv(1));
    b=colorHsv(2)*colorHsv(3)*sin(2*pi*colorHsv(1));
    c=colorHsv(3);

    %----------------------%
end