Image Density Adjustment via Control Point Interpolation
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Solution Overview
Problem
Existing image processing methods for density adjustment on multiple density ranges often result in tone reversal due to interdependent adjustment settings, complicating the detection and prevention of such reversals.
Innovation Solution
An image processing apparatus that determines control points for each density range, adjusts the intermediate point's density level, and generates density characteristics data through interpolation, allowing for independent density adjustment across multiple ranges without tone reversal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If density adjustment is performed independently on multiple density ranges, then the degree of freedom of adjustment is improved, but tone reversal occurs in adjacent density ranges
Solution Approach 1:
The density adjustment function is segmented into multiple independent density ranges (low range and high range), allowing separate adjustment of each range. This segmentation enables independent control of adjustment parameters for each range, providing the degree of freedom while preventing tone reversal through proper boundary handling at the segmentation interfaces.
2Reliability
If detection processing is added to detect tone reversal, then tone reversal prevention is improved, but device complexity increases
Solution Approach 1:
The system performs preliminary actions by pre-defining the relationship between adjacent density ranges and their adjustment parameters. The boundary conditions and monotonicity constraints are established in advance during the adjustment setup, preventing tone reversal before it occurs. This eliminates the need for complex real-time detection processing, as the prevention is built into the adjustment mechanism itself.
Data Source
AI summary
In a case where density adjustment is performed on a plurality of density ranges, adjustment setting values of adjacent density ranges affect one another, and therefore, tone reversal occurs depending on adjustment setting values. Consequently, control points to be used are determined in accordance with a combination of density ranges to be adjusted of the plurality of density ranges. Further, a density level at an intermediate point in a density range to be adjusted is adjusted based on an adjustment level of the density range to be adjusted. Then, by performing interpolation between the control points to be used including an intermediate point whose density level is adjusted, density characteristics data indicative of density characteristics is generated and then density adjustment of image data is performed.