How to label the blank space in a image ?

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Chiriac Andrei
Chiriac Andrei 2016-12-5
评论： Chiriac Andrei 2016-12-6
Hi.I have a problem in identifying an object in a image. I have 9 squares organized like a matrix,3x3,in each square I can have the letter X,number 0 or blank space.I managed to identify the X and 0 with bwlabel and OCR but I can't think of a solution to identify the blank space.If I can recognize the blank space then I can predict if the winner will be X or 0.Any ideas? This image is pretty similar with the images i'm working Image Example . Thanks.
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Chiriac Andrei
Chiriac Andrei 2016-12-6
@Mohammad Taheri,yes,i can find the number of blank spaces but i need the position,not the numbers. @Adam if the line is completely empty,or just 1 x or 0 there how can i figure out if the X/0 it's on (0,1) position,(0,2) or (0,3) ?
Adam
Adam 2016-12-6
Well I don't know how you are identifying it, but I assumed that such identification would come with a location, otherwise how does it count as being identified?

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Cyrus
Cyrus 2016-12-6
编辑：Cyrus 2016-12-6
Here you go:
The matrix named Blank_Matrix has the location of blank squares as 1; else the value is 0.
clear all; close all; clc;
I = imread('xsio.gif');
figure(), imshow(I), title('Input Image')
impixelinfo
Crop_Begin_X = 7;
Crop_Begin_Y = 21;
Width = 219; %%Col
Height = 219; %%Row
%%Cropping the Image.
Cropped_Image = imcrop (I, [Crop_Begin_X, Crop_Begin_Y, Width, Height]);
figure(), imshow(Cropped_Image), title('Cropped_Image')
impixelinfo
%%Convertnig to Black and White
BW_Image = im2bw(Cropped_Image);
figure(), imshow(BW_Image), title('BW_Image')
impixelinfo
[Row, Col] = size(BW_Image);
Crop_Begin_X = 7;
Crop_Begin_Y = 21;
Width = 219; %%Col
Height = 219; %%Row
Blank_Matrix = zeros(3, 3);
Matrix_Row = 0;
Matrix_Col = 0;
Width_of_the_Square = 72;
y=1;
while y + Width_of_the_Square <= Col
Matrix_Col = Matrix_Col+1;
Matrix_Row = 0;
fprintf('Matrix_Col = %d\n', Matrix_Col);
x = 1;
while x + Width_of_the_Square <= Row
Matrix_Row= Matrix_Row+ 1;
fprintf('Matrix_Row = %d\n\n', Matrix_Row);
TMP_title = ' Not Blank' ;
Square = imcrop (BW_Image, [x, y, 72, 72]);
Number_of_White_Pixels = 0;
for i = 1 : Width_of_the_Square
for j = 1 : Width_of_the_Square
if Square(i, j) == 1
Number_of_White_Pixels = Number_of_White_Pixels + 1;
end
end
end
if Number_of_White_Pixels >= 4500
TMP_title = 'Blank';
Blank_Matrix(Matrix_Col, Matrix_Row) = 1;
end
hold on
figure()
imshow(Square), title(TMP_title)
pause(0.5);
hold off
x =x + Width_of_the_Square;
end
y = y + Width_of_the_Square;
end
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Chiriac Andrei
Chiriac Andrei 2016-12-6
This is a good solution if the size of the squares are always the same but in my case,i forgot to mention, the squares will be handwritten on a board or a paper and the size will be different almost every time...

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