Method for training document image distortion correction model, and document image distortion correction method and system using same

A document image distortion correction method performed by at least one processor, the method comprising:

• receiving a first image including a document area;
• generating a backward map for correcting a distortion of the first image by using a document image distortion correction model;
• and
• based on the backward map, generating a second image obtained by correcting the distortion of the first image.

An information processing system comprising:

• a communication module;
• a memory;
• and
• at least one processor connected to the memory and configured to execute at least one computer-readable program included in the memory,
• wherein the at least one program comprises instructions for,
• receiving a first grid dividing a document area into multiple cells on a first image comprising the document area,
• based on the first grid, generate a second grid representing a state in which a distortion of the first image is corrected,
• generate a backward map calculating a pixel in the first grid, corresponding to each pixel in the second grid, and
• train a document image distortion correction model to generate the backward map from the first image.