Angle Image Analysis with Gridlines and Hough

Hey Guys,

I am trying to do some image analysis on MATLAB and find the angle between two lines, but the image already has gridlines. I broke the problem down into the following steps:

1) Import Image - Done

2) Rotate image (they’re a little bit crocked) -Done

3) Grey scale – Done

4) Crop - Optional

5) Remove Gridlines – Having major trouble with

6) Find Edges – Already set up

7) Measure angle using Hough – Not quite sure how

My code is below, I was hoping someone here could give a few tips, especially for the grid removal and Hough technic. My current code is:

%=========================================================================

% ==========================Image Analysis ===============================

% Image reading
clear all;
close all;

Im = imread('xxx900.jpg'); %importing image

imshow(Im);                %Displaying Image

whos Im;                   % Displaying Information

imfinfo('xxx900.jpg');     % More Information

Im2 = rgb2gray(Im);          %Transforming image from red, green Blue to Grey

imshow(Im2)                  %Displaying Image

Im3 = imrotate(Im2,6,'crop') %Fix angle of image

imshow(Im3)                  %Display

%==========================================================================
% Crop Image if required

%Im4 = imcrop(Im3)

%imshow(Im4)

%==========================================================================

% I need to remove gridlines here

% h = pcolor(X,Y,C);

% set(h, 'EdgeColor', 'none');

%==========================================================================

% Display all edges of the image

BW = edge(Im3, 'canny')

imshow(BW)

%=========================================================================

% Calculate Hough Transform

[H,T,R] = hough(BW, 'Theta', 44:0.5:46);