Fast RGB2HSV

Flexible, fast and memory-efficient extension of RGB2HSV

Description

In addition to being inherently more efficient, it introduces optional arguments
- to calculate in single precision
- to calculate only hue or saturation
  or value (or combinations of them)

% Checking performance on a Pentium M 1.4:
img = imread('peppers.png');
tic, hsv_old = rgb2hsv(img); toc
% --> Elapsed time is 0.414767 seconds.
tic, hsv_new = rgb2hsv_fast(img); toc
% --> Elapsed time is 0.190769 seconds.

• MATLAB release: MATLAB 6.5.1 (R13SP1)

[Y. W.]

Works great. Reduced the computation time by half.

[John McArthur]

Really great on R14, WinXP. No problems. More than quartered the computation time by using 'single' and by only working with the 'V'.

Use this if you want to convert color images to BW images, and use the 'V' setting to get the value of each pixel in the HSV system.

[Dave Holden]

isn't much faster, ~10%, for uint8, at least on my size image. 640*480.