Document Inclination Correction in Image Scanning
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Solution Overview
Problem
Existing image processing technologies fail to adequately address the deterioration in reading quality due to both document inclination and positional displacement, leading to incomplete scans and unwanted blank spaces in read image data.
Innovation Solution
An image processing apparatus that includes a determination unit to assess document inclination, a correction unit for rotating the image to correct inclination, and a cut-out unit to extract a partial image based on the document's size, ensuring complete capture of the document portion without missing areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If rotation processing is performed for inclination correction after reading with regular document size, then document inclination is corrected, but reading quality deteriorates due to positional displacement causing missed portions or unwanted blank spaces
Solution Approach 1:
The patent performs preliminary detection of document position and inclination before reading, then adjusts the reading range and performs rotation correction based on the detected information. This preliminary action allows the system to prepare appropriate correction parameters before actual reading, preventing missed portions and blank spaces that would occur with fixed regular document size reading followed by rotation.
Solution Approach 2:
The patent dynamically changes reading parameters (reading range, rotation angle) based on detected document characteristics. Instead of using fixed regular document size, the system adjusts the reading range to accommodate positional displacement and modifies rotation parameters based on actual document inclination, thereby maintaining reading quality while correcting inclination.
2Ease of operation
If regular document size reading is used, then reading process is simple, but document portions may fall out of reading range or blank portions enter reading range due to positional displacement
Solution Approach 1:
The system performs preliminary detection of document position and inclination before reading, then uses this information to adjust the reading range. This preliminary action maintains operational simplicity by automatically determining the appropriate reading area, while preventing information loss by ensuring the entire document is captured within the adjusted reading range.
Solution Approach 2:
The patent creates a universal reading approach that handles both regularly positioned and displaced documents through the same process. The system universally applies detection-reading-correction sequence that adapts to various document positions and inclinations, preventing missed portions while maintaining a unified operational framework.
Data Source
AI summary
There is provided an image processing apparatus including: a determination unit configured to determine an inclination of a document portion in read image data generated by reading a document based on an inclination of an edge of the document portion detected in the read image data; a correction unit configured to correct the inclination of the determined document portion by a rotation process of the read image data; and a cut-out unit configured to cut out, based on a size of the document portion determined from the detected edge, a partial image of the document portion from the read image data in which the inclination has been corrected.