Position Of pixel

heyy.. can anyone help me out in finding out the position of pixel of an binaryimage and the grayscale value of pixel

Answer 1

[Sean de Wolski]

Igray(Ibinary); %extract gray values of true binary values

true_locations = find(Ibinary); %indices of binary values

You'll have to be more specific if you want more information.

EDIT per comment/clarification:

%Ibinary is your logical map
%Igray is your grayscale image  
%Conversions as necessary
if ~isa(Igray,'double');Igray = double(Igray);end
if ~islogical(Ibinary);Ibinary = logical(Ibinary);end

wtrr = bsxfun(@times,(1:size(Igray,1)).',Igray); %weighted Igray by rows
wtrr = sum(wtrr(Ibinary)); %Sum the ones that matter
wtcc = bsxfun(@times,1:size(Igray,2),Igray); %weighted Igray by columns
wtcc = sum(wtcc(Ibinary)); %sum the ones that matter

Gtot = sum(Igray(:));
CGr = sum(wtrr(:))/Gtot;
CGc = sum(wtcc(:))/Gtot;

%CGr is the CG amongst rows (y) and CGc is the CG amongst columns (x)

[Gova ReDDy]

danx for ur reply....ill give a detail information abt dis...

I want to find the position of centre of gravity of binary image using the formual:

COG=(summation(position of pixel * grayscale value of pixel) ) %(summation (grayscale value of pixel))...is der anyother way to find out COG

[Gova ReDDy]

In this line % wtrr = bsxfun(@times,(1:size(Igray,1)).',Igray) %

what does % (1:size(Igray,1)).',Igray) % means

[Gova ReDDy]

what dis %logical % does

[Sean de Wolski]

It multiplies element-wise the column vector (1:size(Igray,1)).' by every column of Igray. logical converts an image to binary.

doc logical

doc bsxfun

[Gova ReDDy]

Danxxxxxxx...can u please figure out this one

How to prepare images of the Gaussian shaped illumination intensity line with --half width:20 lenght:1200 tilt:0.001

[Sean de Wolski]

Nope.

[Gova ReDDy]

thanks in advance....can u xplain me what %gauss2mf% function does in detail