Extract specific row from an image and average with a variable number of adjacent rows

Hello.

I have an image that I perfrom a "linescan" at a specific row at 'xcol'

I want to create a "thick" linescan so include the adjacent rows and then average. Below I have done it for a total of 5 rows (including the centre one).

yth_row=(img(xcol,:)+img(xcol-1,:)+img(xcol+1,:)+img(xcol-2,:)+img(xcol+2,:))/5;Extract

Can this be simplified to any (odd) number of rows to include?

Answer 1

[Constantino Carlos Reyes-Aldasoro]

Certainly it can be done much easier. Instead of this

yth_row=(img(xcol,:)+img(xcol-1,:)+img(xcol+1,:)+img(xcol-2,:)+img(xcol+2,:))/5;

try this

yth_rows =(img(xcol-2:xcol+2,:); % this will select from 2 rows before to 2 after, so it is a matrix not a row
yth_row  = mean(yth_rows); % obtain the average.

This has the advantage that you could even do it for n and the mean will work no matter how many lines you average, you could even do it in a single line, I did it in two to illustrate above, but this works as well

n = 2;   % number of lines above and below to consider
yth_rows =mean(img(xcol-n:xcol+n,:)); % select from n rows above and below average.

Hope that answers the question.

[Jason]

Thankyou