Writing Image Color Adjustment for Board Background Visibility
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Solution Overview
Problem
Existing image processing techniques for extracting and outputting writing from blackboards or whiteboards result in poor visibility due to differences in color appearance between the physical space and display, and the combination of writing and background colors.
Innovation Solution
An image processing apparatus that determines and adjusts color information of the output image based on the detected writing target to enhance visibility, using filters to correct hue, saturation, and brightness, and suppress color emphasis of writing content pixels near the background color.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the extracted writing image is directly output as monochrome image data, then the processing is simple, but the visibility of the image is poor
Solution Approach 1:
The patent applies color changes by determining color information of the output image based on the detected writing target color. The system adjusts hue, saturation, and brightness of the extracted writing content to create an output image with improved visibility. Specifically, the determination unit sets color parameters (hue, saturation, brightness) based on the writing target color detected from the captured image, transforming the monochrome extracted image into a color output image that maintains visibility while preserving processing efficiency.
2Loss of information
If the extracted image is output as a color image, then color information is preserved, but the appearance differs from the physical space view reducing visibility
Solution Approach 1:
The patent applies parameter changes by systematically adjusting color parameters (hue, saturation, brightness) of the extracted writing content. The determination unit calculates optimal parameter values based on the writing target color detected from the captured image. This transforms the color extracted image into an output image where color parameters are optimized for visibility, resolving the discrepancy between physical space appearance and display appearance while preserving essential color information.
3Loss of information
If the writing image is combined with a different background, then the extraction is complete, but the visibility of writing content is reduced
Solution Approach 1:
The patent applies local quality by differentiating the treatment of writing content pixels versus background pixels. The system identifies writing content pixels based on color difference from the background and applies selective color adjustments only to these pixels. The determination unit determines color information specifically for writing content areas, preserving the complete extracted writing while enhancing its visibility through localized color parameter optimization rather than uniform background processing.
Data Source
AI summary
An image processing apparatus (100) includes a determination unit configured to determine, on the basis of color information of a detected writing target, color information of an output image generated from a writing content image that is an image of a writing content written on the writing target.