Image- capturing module sends images to the
module. Then one image goes through many image
processing techniques to extract relevant data in every
level. Some of the most vital data, which are identified by
applying image processing techniques to every images are:
I. Analysing the keyboard to spot the key locations
II. Segmenting the pen from the background
III. Generating the letters
After detection of the edges of the keyboard from the
primary start-up image. It calculates the dimensions of the
keyboard. Thereafter it calculates the height of one column
and width of one raw keyboard and calculates the key
coordinates of every key and is stored in array with virtual
key codes. After finding the blue pixel coordinates of an
image there coordinates are compared with every raw of
the array to find the keyblock area to spot the virtual key
code. The virtual key codes are used to generate the
letters.