How to get pixel information of a straight line plotted in an image?

Hi..evryone. I have a binary image of a corridor or a maze where white areas indicate the corridor path or accessible path. And black regions represent the inaccessible areas. I have been provided a start point and I want to trace my path through the corridor and find a way out of it. So for this I start by projecting straight lines in 4 directions upto a certain xtent and see if any of them fully traverses through white zone only. So for this i need to know the pixel info. of the point on the st. lines. Is there any way of getting it?

Again is there any better approach of solving the problem? If its thre. please let me know. Thanx in advance!! The image of the corridor is attached for help.

Answer 1

[Image Analyst]

I solve a maze using image processing and morphology. See my File Exchange: http://www.mathworks.com/matlabcentral/fileexchange/27175-mazesolution

Basically you label the walls, take one wall, say the left one, fill holes, dilate, subtract, and you're left with just the left wall.

Other resources for you are

Steve's Blog where he talks about using bwgeodesic() to solve the shorted path problem.

Prof. Luengo's Blog solves harder mazes than mine.

[roro6992]

Thanx for ur suggesstion. But the maze that i wud be provided with wudnt be like your 'perfect maze'. It wud just have a starting co-ordinate.And i wud have to recognize symbols on my way and take decisions of right or left turn. Anyway just tell me nah if there is any way to iterate over a line segment in matlab and obatin the pixel information along the st. line??

[Image Analyst]

You can use improfile(). Just pass in the end point coordinates of your line segment and it will return the intensity along the line.

[roro6992]

Yea yea.Found it. Thanx anyway :)

[Image Analyst]

I'm glad improfile() worked for you - that's it's main purpose. What do you mean anyway ?