How to set target matrix in matlab for training images?

I am training three different images(stop sign, no-left sign and no-entry sign).I have taken 50 images for each of size 8x8. So, my input will be 150x64 matrix, output will 3x1 matrix, but how do i assign the target for these images, also do i have to normalize these images before proceeding to the training part?

Answer 1

[Stalin Samuel]

click here for detailed information about target selection