Rendering personalized text on curved image surfaces

A system that facilitates replacing an existing text string on a curved surface in an image with a personalized text string, comprising:

• a non-transitory computer-readable medium that stores computer-executable instructions;
• a processor that executes the computer-executable instructions, the instructions comprising:
• receiving user input pertaining to a location of an existing text string in the image;
• defining a bounding polygon according to user input;
• segmenting the existing text string;
• performing connected component analysis on the text string to identify connected components in the existing text string;
• detecting upper and lower extreme edge pixels of text characters represented by the connected components;
• identifying an edge at each side of the curved surface;
• calculating 3D curved surface geometry and camera geometry using the upper and lower extreme edge pixels of the text characters and identified edges, wherein calculating 3D curved surface geometry and camera geometry comprises generating a 3D central projection pinhole camera model defined as:
• [E,lL,lR]=M(f,{right arrow over (n)},{right arrow over (s)})
• where E is a projected ellipse, lL, is a left edge of the curved surface, lRis a right edge of the curved surface, M is the model,f is a focal length from a point of origin to an image plane, {right arrow over (n)} is a normal vector, and {right arrow over (s)} is a shift vector;
• erasing the existing text string by replacing text pixels with background-colored pixels;
• and
• inserting a personalized text string into the location of the erased text according to the calculated 3D curved surface geometry and camera geometry.

A computer-implemented method for placing personalized text onto a curved surface in an image, comprising:

• bounding a region on a curved surface in the image;
• segmenting an existing text string in the bounded region;
• detecting upper and lower extreme edge pixels of text characters represented by connected components in the bounded region;
• identifying an edge at each side of the curved surface;
• via a processor, calculating 3D curved surface geometry and camera geometry by generating a 3D central projection pinhole camera model defined as:
• [E,lL,lR]=M(f,{right arrow over (n)},{right arrow over (s)})
• where E is a projected ellipse, lLis a left edge of the curved surface, lRis a right edge of the curved surface, M is the model, f is a focal length from a point of origin to an image plane, {right arrow over (n)} is a normal vector, and {right arrow over (s)} is a shift vector;
• replacing existing text pixels in the bounded region with background-colored pixels;
• and
• inserting a personalized text string into the bounded region according to the calculated 3D curved surface geometry and camera geometry to personalize the image, and outputting the personalized image.