Image Compression System Using 2x2 Block DPCM and PCM Modes
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Solution Overview
Problem
Conventional image compression techniques for LCD DCC devices suffer from subjective picture quality deterioration, increased decoder complexity, and inability to achieve exact bit rate control, particularly affecting the performance of TFT-LCD panels.
Innovation Solution
A data compression and reconstruction system that selectively uses Differential Pulse Code Modulation (DPCM) and Pulse Code Modulation (PCM) methods to compress and decompress images in units of 2x2 blocks, allowing for precise bit rate control and minimizing picture quality degradation by calculating differences and truncating data based on predetermined criteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional image compression techniques (JPEG, H.264) are used to reduce data size, then the amount of data is reduced, but subjective picture quality deteriorates with crushed edges and visible compression artifacts
Solution Approach 1:
The patent divides the image into 2x2 pixel blocks as the basic processing unit. This fine-grained segmentation allows the system to process and compress small regions independently, preserving local image details and reducing the visibility of compression artifacts while still achieving overall data reduction when processing the entire image.
Solution Approach 2:
The patent applies different compression strategies to different regions by processing 2x2 blocks independently. This allows the system to maintain higher quality in regions where it is critical while applying more aggressive compression where tolerable, thereby improving overall subjective picture quality compared to uniform compression approaches.
2Productivity
If transform coding compression is applied to reduce data size, then compression efficiency is improved, but decoder complexity increases significantly
Solution Approach 1:
The patent extracts and eliminates the complex transform coding operations from the compression system. By replacing transform coding with direct differential encoding on 2x2 blocks, the system removes the computationally intensive inverse transform and quantization steps that burden the decoder, significantly reducing decoder complexity while maintaining compression efficiency.
Solution Approach 2:
The patent uses simple differential encoding operations that are computationally inexpensive and easy to implement in hardware. These simple encoding operations replace complex transform coding, making the decoder much simpler while still achieving the necessary compression ratios for LCD DCC applications.
3Quantity of substance
If conventional compression standards are used to reduce memory requirements, then storage capacity is reduced, but exact bit rate control becomes impossible
Solution Approach 1:
The patent employs dynamic mode selection for each 2x2 block, choosing between different encoding modes (intra-block differential, inter-block differential, etc.) based on local image characteristics. This dynamic adaptation allows the system to precisely control the number of bits used for each block, enabling exact bit rate control for the entire image while efficiently utilizing memory capacity.
Data Source
AI summary
A system, medium, and method compressing and/or restoring images. Such a data compression method may include selecting a mode from among a plurality of modes for compressing current data, according to predetermined criteria, and calculating a difference between the current data and reference data, according to the selected mode, and compressing the current data, or truncating a part of the current data and compressing the current data. Accordingly, it is possible to significantly lower the complexity of an image encoder/decoder system and exactly meet a picture-based CBR required by LCD DCC devices/systems.