Mobile Business Card Image Angle Rectification
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Solution Overview
Problem
Business card recognition on mobile devices is hindered by recognition failures due to shooting angle deviations and complex correction processes, particularly affecting elderly or operationally unfamiliar users, especially when background colors are similar to the card.
Innovation Solution
An automatic method for rectifying business card presentation angle using two axes derived from character arrangement and space on the card, adjusting font orientation, and aspect ratio to correct obliqueness and generate a standardized image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual correction interface is provided for users to adjust shooting angle, then correction flexibility is improved, but operation complexity increases and elderly or unfamiliar users cannot easily carry out the correction
Solution Approach 1:
The system performs automatic angle correction without requiring user intervention. The control unit automatically detects the shooting angle from the captured image and applies correction algorithms, allowing the system to serve itself rather than requiring manual user operation.
Solution Approach 2:
The manual mechanical adjustment interface is replaced with an automatic digital correction system. Instead of requiring users to manually adjust parameters through a user interface, the system uses image processing algorithms to automatically detect and correct the shooting angle.
2Productivity
If automatic correction through color contrast is used, then correction speed is improved, but recognition accuracy decreases when background color is similar to the card
Solution Approach 1:
The system changes the detection parameter from color contrast to geometric arrangement of characters. Instead of relying on color differences between card and background, the system detects the shooting angle based on the spatial distribution and arrangement patterns of character pixels, which remains effective regardless of color similarity.
Solution Approach 2:
The character arrangement serves as an intermediary feature that indirectly indicates the shooting angle. Rather than directly measuring color contrast or physical angle, the system uses the geometric pattern of characters as a mediator to infer and correct the shooting angle.
3Ease of operation
If border lines are provided in viewing window for angle correction, then user guidance is improved, but the departure of shooting angle occurring at shoot button press cannot be eliminated
Solution Approach 1:
The system performs angle detection and correction automatically after the image is captured, eliminating the need for preliminary manual adjustment. The control unit processes the captured image to detect the shooting angle and applies correction, ensuring that even angles deviating during the shoot button press are automatically corrected.
Data Source
AI summary
A method for automatically rectifying business card presentation angle is described. The method is applicable to a mobile electronic device to automatically rectify a presentation angle of a shot business card image. Firstly, maintain character pixels of the shot business card image, and divide the character pixels into character groups by determining whether the pixel pitch is larger than a predetermined value. Next, obtain a first axis and a second axis of the character groups. After that, calculate an included angle formed between the first axis and the second axis, and adjust the oblique character groups through angles obtained for correction. Then, adjust aspect ratios of all the character groups after angle correction according to appropriate character aspect ratios, to make the displayed font seem normal. Finally, generate a corrected business card image according to the character groups after correction.