Distance bethween two regions

Good evening, I have to measure the distance between the two regions, as shown in the image, in a sequence of 1800 frames in succession. The distance varies frames by frames. I have difficulty in finding the minimum distance between these two. I enclose a picture type. thank you very much

http://i43.tinypic.com/16c17jn.jpg

[Cedric]

Do you need to find the number of pixels between the two regions without taking into account the protuberance, or do you have the information already written in the image and you need to extract text (48.06 in this specific image)?

[Image Analyst]

What criteria are you using to find the endpoints of that line? Exactly what/where are the two regions? Can you outline them for us, say in a red outline? Is this the best focus you can achieve???

[Ektor Lucci]

in the picture I have used the imdistline. I have to create a loop to make sure that detects the distance between the two white regions in an automatic way.

[Ektor Lucci]

http://tinypic.com/view.php?pic=2dcho2u&s=5#.UjnrC8a-18E

Answer 1

[Image Analyst]

Try this:

% Get a thick band of pixels
band = grayImage(42:68, :);
% Get the mean horizontal profile by
% averaging along rows within each column.
horizontalProfile = mean(band, 1);
% Threshold to find dark area
darkPixels = horizontalProfile < 128' % Or whatever value...
% Find starting column
startingColumn = find(darkPixels, 1, 'first');
% Find ending column
endingColumn = find(darkPixels, 1, 'last');

[Ektor Lucci]

can you send me a loop for 10 images as an example?

[Image Analyst]

Sure! Code for that is here in the FAQ: http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F. Just copy, paste, and make slight adaptations.