How to get the intensity of pixels of a gray scale image with a gray background around 0.0, with white at +1 and black at -1 ?

Neural Network Learning purpose

Answer 1

[Image Analyst]

Try this:

thePixelIntensity = grayImage(row, column);

If grayImage has values of only 1,0,-1, then thePixelIntensity will obviously have the same values.

[Sleeba Paul]

I would like to ask for a help. In the neural networks assignment we are given with the data of gray scale intensity of the image. I've written the following code in MATLAB to get a new image an extract the gray scale image intensity. I'm getting the following results.

I1=imread('C:\Users\sleeba\Documents\MATLAB\Handwriting Recogntion\eight.jpg');

I2 = imresize(I1,[20 20]);

G=rgb2gray(I2);

mask=true(size(G));

Weight=graydiffweight(G,mask);

Weight=Weight(:)';

Image I've processed

The processed gray scale image

The right processing pattern from the training set ( Not exactly this. Just Take this as an example of desired output)

The condition for right processing is :

Your images need to use floating-point format, with a gray background around 0.0, with white at +1 and black at -1.

[Image Analyst]

If you want an image in the range of -1 to 1, do this

normalizedImage = 2 * mat2gray(grayImage) - 1;