Patent ID: 8558872

Claim:
An apparatus for processing a digital image, comprising: an image sensor unit configured to sense a hand-drawn sketch and to convert the sensed hand-drawn sketch to the digital image, wherein the hand-drawn sketch corresponds to a physical sketch being expressed with a liquid or solid substance hand-drawn by a user; an image storage unit configured to store the converted digital image; an image display unit configured to visualize the stored digital image to a virtual hand-drawn sketch; and a controller configured to perform steps of: sensing a first hand-drawn sketch on a first sketching plane and storing the sensed first hand-drawn sketch as a first digital image; detecting the first sketching plane is changed to a second sketching plane; visualizing the stored first digital image as a first virtual hand-drawn sketch on the second sketching plane when the first hand-drawn sketch is not detected; sensing a second hand drawn sketch being drawn on the second sketching plane, while the first virtual hand-drawn sketch is visualized on the second sketching plane; and storing the sensed second hand-drawn sketch as a second digital image; recognizing the first hand-drawn sketch or the second hand-drawn sketch, and visualizing a virtual guide image, wherein the virtual guide image includes an extension line image of the first hand-drawn sketch or second hand-drawn sketch or an additional image providing a 3-dimensional view of the first hand-drawn sketch or second hand-drawn sketch.