Image Scaling Processing Units for Signal Deviation Elimination
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Solution Overview
Problem
Existing image processing technologies, such as those disclosed in Japanese Unexamined Patent Application Publication No. 2003-189266, experience signal deviations when scaling image data including luminance and color-difference signals with different data rates, particularly in formats like YCbCr 4:2:2, due to improper setting of resampling positions during DDA operation switching.
Innovation Solution
An image processing apparatus and method that performs scaling processing using a first scaling processing unit for signals with a high data rate and a second scaling processing unit for signals with a low data rate, where the second scaling processing unit corrects the scale factor for the low data rate signals to adjust the results and eliminate signal deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single scaling processing unit is used for all signals, then the device complexity is reduced, but signal deviation occurs between high and low data rate signals
Solution Approach 1:
The patent divides the scaling processing function into separate processing units based on signal data rate. A first scaling processing unit handles high data rate signals (e.g., luminance Y in YCbCr 4:2:2), while a second scaling processing unit handles low data rate signals (e.g., color-difference Cb and Cr). This segmentation prevents signal deviation by ensuring each signal type is processed with appropriate resampling positions, thereby maintaining signal alignment accuracy without requiring excessive complexity.
2Manufacturing precision
If different scaling processing units are used for high and low data rate signals, then signal alignment accuracy is improved, but device complexity increases
Solution Approach 1:
The patent implements a unified scaling control mechanism that manages multiple scaling processing units. The control unit generates scaling control signals that are applicable across different signal types, allowing the system to handle both high and low data rate signals with a coordinated approach. This multi-functionality reduces the need for completely independent processing paths, thereby limiting the increase in device complexity while maintaining signal alignment accuracy.
3Ease of operation
If resampling positions are not corrected for low data rate signals, then processing simplicity is maintained, but signal deviation and color representation accuracy deteriorate
Solution Approach 1:
The patent applies different processing strategies to different signal types based on their specific characteristics. For low data rate signals (such as Cb and Cr in YCbCr 4:2:2), the second scaling processing unit implements corrected resampling positions that account for the lower sampling rate. This localized quality adjustment ensures that color-difference signals are properly aligned with luminance signals, maintaining color representation accuracy without complicating the overall processing framework.
4Speed
If scaling processing is performed without correcting scale factors, then processing speed is maintained, but signal deviation occurs between different data rate signals
Solution Approach 1:
The patent implements preliminary correction of scale factors for low data rate signals before the actual scaling processing begins. The control unit pre-calculates appropriate scaling control signals that account for the different data rates of various signal types. This preliminary action ensures that when scaling processing occurs, the resampling positions are already optimized, preventing signal deviation while maintaining processing speed through efficient pre-computation.
Data Source
AI summary
To eliminate a signal deviation that occurs when scaling processing is performed on image data including multiple signals having different data rates, there is provided an image processing apparatus which performs scaling processing on image data including multiple signals having different data rates and includes a first scaling processing unit that performs a first scaling processing according to a first scale factor in a first area; and a second scaling processing unit that performs a second scaling processing subsequent to the first scaling processing, according to a second scale factor in a second area adjacent to the first area, on a signal having a high data rate using the first scale factor, and performs the second scaling processing on a signal having a low data rate using the second scale factor obtained by correcting the first scale factor, after the first scaling processing.