Image-drawing processing system, server, user terminal, image-drawing processing method, program, and storage medium

A non-transitory computer-readable medium storing a program comprising instructions that when executed by a computer cause the computer to execute a method of processing image-drawing, the method comprising the steps of:

• receiving input information relating to image-drawing and image-erasing;
• obtaining more than one image-drawing input stroke and an image-erasing input stroke;
• determining that the image-erasing input stroke forms a closed loop when a distance between the beginning and ending points of the closed loop does not exceed a threshold number of pixels;
• erasing, using a first erasing process, all coordinates of all the image-drawing input strokes, when any one of the coordinates of at least one image-drawing input stroke exists within the closed loop;
• determining that the image-erasing input stroke forms a partially closed loop when the distance between the beginning and ending points of the image-erasing input stroke exceeds the threshold number of pixels;
• erasing, using a second erasing process, the portion of the coordinates of the image-drawing input strokes within the partially closed loop;
• wherein the circuitry is further configured to perform:
• in response to determining that the image-erasing input stroke does not form a loop;
• computing a length of the image-erasing input stroke;
• generating an erasing area with a width which changes based on the length, the erasing area including regions with the width extending from two sides of each point that forms the image-erasing input stroke, wherein the longer the length of the image-erasing input stroke, the wider the width associated with the erasing area, and
• erasing, using a third erasing process, the portion of the coordinates of the image-drawing input strokes within the erasing area.

A computer implemented method, comprising:

• receiving input information relating to image-drawing and image-erasing;
• obtaining more than one image-drawing input stroke and an image-erasing input stroke;
• determining that the image-erasing input stroke forms a closed loop when a distance between the beginning and ending points of the closed loop does not exceed a threshold number of pixels;
• erasing, using a first erasing process, all coordinates of all the image-drawing input strokes, when any one of the coordinates of at least one image-drawing input stroke exists within the closed loop;
• determining that the image-erasing input stroke forms a partially closed loop when the distance between the beginning and ending points of the image-erasing input stroke exceeds the threshold number of pixels;
• erasing, using a second erasing process, the portion of the coordinates of the image-drawing input strokes within the partially closed loop;
• wherein the circuitry is further configured to perform:
• in response to determining that the image-erasing input stroke does not form a loop;
• computing a length of the image-erasing input stroke;
• generating an erasing area with a width which changes based on the length, the erasing area including regions with the width extending from two sides of each point that forms the image-erasing input stroke, wherein the longer the length of the image-erasing input stroke, the wider the width associated with the erasing area, and
• erasing, using a third erasing process, the portion of the coordinates of the image-drawing input strokes within the erasing area.

An image drawing processing system, comprising:

• one or more user terminals;
• and
• a server couplable with each other via a network, the server to process information from each of the user terminals,
• wherein each of the user terminals include circuitry configured to:
• receive information relating to image-drawing and information relating to image-erasing;
• obtain more than one image-drawing input strokes and an image-erasing input stroke;
• to determine that the image-erasing input stroke forms a closed loop when a distance between the beginning and ending points of the loop does not exceed a threshold number of pixels;
• to erase, using a first erasing process, all coordinates of all the image-drawing input strokes, when any of the coordinates of the of at least one image-drawing input strokes exists within the closed loop;
• to determine that the image-erasing input stroke forms a partially closed loop when the distance between the beginning and ending points of the image-erasing input stroke exceeds the threshold number of pixels;
• erasing, using a second erasing process, the portion of the coordinates of the image-drawing input strokes within the partially closed loop;
• in response to determining that the image-erasing input stroke does not form a loop;
• compute a length of the image-erasing input stroke,
• generating an erasing area with a width which changes based on the length, the erasing area including regions with the width extending from two sides of each point that forms the image-erasing input stroke, wherein the longer the length of the image-erasing input stroke, the wider the width associated with the erasing area, and
• erasing, using a third erasing process, the potion of the coordinates of the image-drawing input strokes within the erasing area;
• wherein the server includes circuitry configured to:
• to receive the information relating to image-drawing and the information relating to image-erasing from each of the user terminals;
• obtain image-drawing input information that is intersecting with the image-erasing input information as intersecting-image information;
• and
• divide the intersecting-image information.