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From: Avengeline on 8 Mar 2010 06:06
I am just wondering,

is edge detection applicable to hue or saturation images? or just grayscale image?

comparing between edge detection in grayscale and color images,

which is better?
From: ImageAnalyst on 8 Mar 2010 07:37
Yes. The hue image and the saturation image (as well as the Value,
Intensity, and/or Lightness image) are all monochrome images. Look at
each of them and see which seems to have the "best" edges and then run
the edge detector on that. You might have to run on several of them
and combine them somehow.
From: Avengeline on 8 Mar 2010 08:05
ImageAnalyst <imageanalyst(a)mailinator.com> wrote in message <ea84e39d-1a42-4226-9944-ebed94364a17(a)t20g2000yqe.googlegroups.com>...
> Yes. The hue image and the saturation image (as well as the Value,
> Intensity, and/or Lightness image) are all monochrome images. Look at
> each of them and see which seems to have the "best" edges and then run
> the edge detector on that. You might have to run on several of them
> and combine them somehow.

so the edge detector chosen must be applicable to monochrome images right? such as binary edge detector?

is it possible to use grayscale edge detector such as sobel edge detector? by mapping the hue image into the range of 0 - 255.
From: Avengeline on 8 Mar 2010 08:12
i have another question,..

if for one row of grayscale image.. let's say row 1.. the pixel values are such as..

row1 = [40, 45, 40, 65, 65, 80, 75];

for example, after sobel edge filtering.. the edge position is such as..

row1 = [0, 1, 0, 0, 0, 1, 0];

meaning to say, there is an edge at pixel (1, 2) and (1, 6)..

is the edge detected at pixel (1,2) a false edge?
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