Document Image Cropping with Tab Boundary Detection
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Solution Overview
Problem
Existing image processing technologies face challenges in accurately detecting and cropping document images that include tabs, as they often result in errors due to the presence of tabs, which can lead to incorrect boundary line detection and image cropping.
Innovation Solution
An image processing apparatus and method that includes an image input unit, a line determination unit, a selector, and an image cropper, which determines boundary lines for both tab and non-tab portions of a document and allows selection based on user settings to crop the document image accurately, thereby eliminating or including the tab as per requirement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single boundary line detection method is used for documents with tabs, then the processing is simple, but the detection precision deteriorates due to incorrect boundary line detection
Solution Approach 1:
The patent segments the boundary line detection into two distinct cases: tab portions and non-tab portions. The line determination unit separately determines a first boundary line for tab portions and a second boundary line for non-tab portions, allowing each to be processed with appropriate detection methods without interference from tabs.
Solution Approach 2:
The patent implements dynamic selection of boundary lines based on document characteristics. The selector unit dynamically chooses between the first boundary line (for tab portions) and the second boundary line (for non-tab portions) based on real-time analysis of the document image, adapting the detection approach to the specific document structure.
2Manufacturing precision
If the tab portion is included in the cropped image, then the completeness of the document image is improved, but the accuracy of document content extraction deteriorates
Solution Approach 1:
The patent provides dynamic control over tab inclusion in cropped images through user settings. The selector unit can choose to include or exclude tab portions based on predetermined settings, allowing users to balance between image completeness and content purity according to their specific needs.
Solution Approach 2:
The patent applies different quality standards to different parts of the document. Tab portions can be selectively included or excluded based on their local characteristics and the user's requirements, while the main document content is always preserved with high accuracy.
3Loss of information
If the tab portion is excluded from the cropped image, then the document content purity is improved, but the completeness of the document image deteriorates
Solution Approach 1:
The patent implements dynamic control over tab exclusion through user settings. The selector unit can dynamically adjust whether to exclude tab portions based on predetermined settings, allowing users to optimize between content purity and image completeness for different application scenarios.
Data Source
AI summary
Provided are an image processing apparatus, an image processing method, a computer-readable medium storing a computer program and an image processing system cropping a document image from image data including a document region having a tab. The image processing apparatus includes a line determination unit for determining a line extending the boundary of the document region in the tab portion and a line extending the boundary of the document region in the non-tab portion, respectively, a selector for selecting, in accordance with the setting designating the outside or the inside of the document region, one line either in the outside or in the inside from the among lines determined by the line determination unit, and an image cropper for cropping an image of the document region with the selected line as a boundary line.