getting pixels information of the image

Hii guys..

I want to get the pixels information of a black and white image in 8 bit binary format.

what is the best way to do that?

[Geoff Hayes]

Divya - please clarify with an example of what you are looking for. Do you have a mxn image of unsigned integers? Are the integers already 8-bit? Do you want to write out (to text file) or put in a cell array the 8-bit binary strings for each pixel?

Answer 1

[Harshendra Shah]

Hi Divya,

You can use impixel function to determine the values of one or more pixels in an image and return the values in a variable.

After getting the pixel values you can convert those values into 8-bit binary vector by using de2bi function.

You can refer to the following MATLAB Answers for better understanding:

https://www.mathworks.com/matlabcentral/answers/296765-getting-pixel-values-from-an-image

https://www.mathworks.com/matlabcentral/answers/147274-how-to-convert-decimal-values-into-8bit-binary-values-in-a-256-256-matrix

I hope this helps.

Answer 2

[Image Analyst]

Try this. Adapt as needed.

% Create some sample data - a small image.
grayImage = uint8(10*magic(5))
[rows, columns] = size(grayImage)
% Loop over all locations giving the gray level in decimal and binary.
for col = 1 : columns
	for row = 1 : rows
		thisGrayLevel = grayImage(row, col);
		binaryString = dec2bin(thisGrayLevel);
		fprintf('grayImage(%d, %d) = %d = "%s".\n', ...
			row, col, thisGrayLevel, binaryString);
	end
end

You'll see

grayImage =

5×5 uint8 matrix

170 240 10 80 150

230 50 70 140 160

40 60 130 200 220

100 120 190 210 30

110 180 250 20 90

rows =

5

columns =

5

grayImage(1, 1) = 170 = "10101010".

grayImage(2, 1) = 230 = "11100110".

grayImage(3, 1) = 40 = "101000".

grayImage(4, 1) = 100 = "1100100".

grayImage(5, 1) = 110 = "1101110".

grayImage(1, 2) = 240 = "11110000".

grayImage(2, 2) = 50 = "110010".

grayImage(3, 2) = 60 = "111100".

grayImage(4, 2) = 120 = "1111000".

grayImage(5, 2) = 180 = "10110100".

grayImage(1, 3) = 10 = "1010".

grayImage(2, 3) = 70 = "1000110".

grayImage(3, 3) = 130 = "10000010".

grayImage(4, 3) = 190 = "10111110".

grayImage(5, 3) = 250 = "11111010".

grayImage(1, 4) = 80 = "1010000".

grayImage(2, 4) = 140 = "10001100".

grayImage(3, 4) = 200 = "11001000".

grayImage(4, 4) = 210 = "11010010".

grayImage(5, 4) = 20 = "10100".

grayImage(1, 5) = 150 = "10010110".

grayImage(2, 5) = 160 = "10100000".

grayImage(3, 5) = 220 = "11011100".

grayImage(4, 5) = 30 = "11110".

grayImage(5, 5) = 90 = "1011010".