Document Image Correction via Line Segment Approximation

Solution Overview

Problem

Existing image correction techniques for documents require complex distance measuring devices, increasing manufacturing costs and device size, to correct distortion caused by document surface deformation.

Innovation Solution

An image correction device comprising a line segment detection module, a shape specification module, and an image correction module that detects line segments, specifies shape approximation lines, and corrects images using these lines to address distortion without the need for a distance measuring device.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a distance measuring device is used to measure distances at multiple points on the document surface, then image distortion correction precision is improved, but device complexity and manufacturing cost increase

Engineering Contradiction:

Improveimage distortion correction precisionVSAvoiddevice complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent uses line segments from the document image itself as a copy or representation of the document surface geometry, replacing the need for physical distance measuring devices. By detecting line segments in the captured image and using them to infer surface deformation, the system achieves distortion correction without external measuring equipment.

Inventive Principle:

Principle #26Copying

Solution Approach 2:

The patent replaces the mechanical distance measuring device with an image processing-based system. Instead of physically measuring distances at multiple points on the document surface, the system uses computer vision to detect line segments and calculate surface shape from image data alone, substituting mechanical measurement with optical and computational methods.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If a distance measuring device is used to measure distances at multiple points on the document surface, then image distortion correction precision is improved, but manufacturing cost increases

Engineering Contradiction:

Improveimage distortion correction precisionVSAvoidmanufacturing cost

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The patent uses line segments from the document image itself as a copy or representation of the document surface geometry, replacing the need for physical distance measuring devices. By detecting line segments in the captured image and using them to infer surface deformation, the system achieves distortion correction without external measuring equipment.

Inventive Principle:

Principle #26Copying

Solution Approach 2:

The patent replaces the mechanical distance measuring device with an image processing-based system. Instead of physically measuring distances at multiple points on the document surface, the system uses computer vision to detect line segments and calculate surface shape from image data alone, substituting mechanical measurement with optical and computational methods.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Measurement precision

If a distance measuring device is used to measure distances at multiple points on the document surface, then image distortion correction is achieved, but device size increases

Engineering Contradiction:

Improveimage distortion correction capabilityVSAvoiddevice size

Core Design Contradiction:

Measurement precisionVSVolume of moving object

Solution Approach 1:

The patent uses line segments from the document image itself as a copy or representation of the document surface geometry, replacing the need for physical distance measuring devices. By detecting line segments in the captured image and using them to infer surface deformation, the system achieves distortion correction without external measuring equipment.

Inventive Principle:

Principle #26Copying

Solution Approach 2:

The patent replaces the mechanical distance measuring device with an image processing-based system. Instead of physically measuring distances at multiple points on the document surface, the system uses computer vision to detect line segments and calculate surface shape from image data alone, substituting mechanical measurement with optical and computational methods.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS10600161B2Image correction device

Publication Date: 2020.03.24 YAMAHA CORP

AI summary

An image correction device includes a line segment detection module, a shape specification module and an image correction module. The line segment detection module detects from a captured image obtained by photographing a document a plurality of line segments that correspond to the notation on the surface of the document. The shape specification module specifies shape approximation lines that approximate the surface shape of the document from the plurality of line segments. The image correction module utilizes the shape approximation lines specified by the shape specification module to correct the captured image.