Adaptive Quantization for DPCM and PCM Mode Switching
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Solution Overview
Problem
Current data compression techniques, particularly in image processing, face challenges in efficiently reducing data size while maintaining quality, especially when dealing with varying pixel values and differences, leading to suboptimal compression ratios and increased bandwidth requirements.
Innovation Solution
The method employs adaptive quantization to determine whether a pixel is coded as PCM or DPCM data based on a difference signal's range and error values, using an adaptive quantization module to dynamically adjust the coding mode and reduce data size effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If DPCM coding is used for all pixels, then compression ratio is improved, but image quality deteriorates when difference signal exceeds representable range
Solution Approach 1:
The patent implements dynamic mode switching between DPCM and PCM coding for each pixel based on whether the difference signal falls within the representable range. This dynamic adaptation allows the system to maximize compression ratio while preventing quality deterioration by switching to PCM mode when difference signals exceed the DPCM range, thus resolving the contradiction between compression efficiency and image quality reliability.
2Reliability
If adaptive quantization with mode switching is implemented, then image quality is improved, but device complexity increases
Solution Approach 1:
The patent segments the coding process into distinct modes (DPCM and PCM) with clear decision boundaries based on difference signal range. This segmentation simplifies the adaptive quantization logic by providing straightforward conditional branching rather than complex continuous optimization, thereby improving image quality while limiting the increase in device complexity to manageable levels.
3Reliability
If PCM coding is used for pixels with large difference signals, then image quality is maintained, but compression ratio deteriorates
Solution Approach 1:
The patent changes the coding parameter (mode selection) based on the magnitude of the difference signal. By monitoring the difference signal range and switching between DPCM and PCM modes, the system optimizes the balance between compression ratio and image quality for each pixel, using DPCM for small differences to maximize compression and PCM for large differences to maintain quality, thus resolving the contradiction between these two parameters.
Data Source
AI summary
The embodiments of the present invention provide for methods, devices, and systems adapted to perform adaptive quantization processes. The adaptive quantization processes of the present invention are adapted to provide one or more adaptive quantization modes based on one or more previous pixels and their associated coding modes. The output of an adaptive quantization process may include coded data and a coding mode, indicating whether the coded data is pulse code modulation (PCM) data or differential pulse code modulation (DPCM) data.