Electronic device and method for correcting handwriting input data

A method for correcting handwriting input data by an electronic device, the method comprising:

• receiving a user input including a touch trajectory from a touchscreen display;
• based on the user input, recognizing handwriting input data on a per-phoneme-character basis;
• for each phoneme character corresponding to the recognized handwriting input data, distinguishing between a first stroke and one or more Nth strokes, where N is an integer greater than 1, constituting the phoneme character;
• determining, whether point intersections exist between the first stroke and the one or more Nth strokes for each of the phoneme characters and, when present, determining locations thereof;
• based on the locations of the determined point intersections, if any, correcting each of the phoneme characters;
• and
• based on the corrected phoneme characters, updating the touch trajectory corresponding to the handwriting input data.

An electronic device comprising:

• a touchscreen display;
• a memory configured to store executable instructions;
• and
• a processor configured to access the memory to execute the instructions, wherein the instructions, when executed by the processor, cause the electronic device to:
• receive a user input including a touch trajectory from the touchscreen display;
• based on the user input, recognize handwriting input data on a per-phoneme-character basis;
• for each recognized phoneme character, extract stroke features by converting angular components of points included in each stroke into direction vectors, converting the direction vectors into eight-direction vectors, and converting the eight-direction vectors into stroke scores;
• identify, for each recognized phoneme character, a reference feature defined by a recognition code associated with the phoneme character, and select a subset of the recognized phoneme characters for correction based on whether the stroke features meet the corresponding reference feature;
• for each selected phoneme character, determine whether the phoneme character is circle-type;
• for a selected circle-type phoneme character, determine whether a point intersection exists between start and end points of a stroke, and when the point intersection does not exist, generate a point intersection and increase the touch trajectory so that the stroke is connected to the generated point intersection, and when the point intersection exists and the trajectory extends beyond the point intersection, remove points of the stroke that extend beyond the point intersection;
• for a selected non-circle-type phoneme character, distinguish between a first stroke and one or more Nth strokes constituting the phoneme character, where N is an integer greater than 1, determine whether a point intersection exists between the first stroke and the one or more Nth strokes, and when the point intersection does not exist, generate a point intersection and increase a trajectory of the first stroke or the one or more Nth strokes so that the stroke is connected to the generated point intersection, and when the point intersection exists and a trajectory extends beyond the point intersection, remove points of the trajectory that extend beyond the point intersection;
• update index information of one or more stroke points to correspond to a location of a generated or determined point intersection;
• and
• based on the updated index information, update the touch trajectory corresponding to the handwriting input data and render corrected handwriting on the touchscreen display.