Parallel Deblocking Filter Buffer Timing Synchronization
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Solution Overview
Problem
The existing moving image processor technologies face challenges in efficiently transferring parallel deblocking filtering results to an external memory, particularly when multiple macroblocks are processed in parallel, leading to increased burden and inefficiency due to differing positions and operation timings of deblocking filter circuits.
Innovation Solution
A moving image processor with a data transfer unit comprising buffers that absorb the differences in positions and operation timings of deblocking filter circuits, allowing sequential transfer of filtering results from separate buffers to external memory, facilitating efficient data transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If parallel deblocking filtering is performed on multiple macroblocks using multiple deblocking filter circuits, then processing speed is improved, but the complexity of transferring results to external memory increases due to differing positions and operation timings
Solution Approach 1:
A buffer is introduced as an intermediary component between the deblocking filter circuits and external memory. The buffer receives filtering results from multiple deblocking filter circuits at different times and positions, storing them temporarily before transferring to external memory. This mediator absorbs the timing and position differences, simplifying the data transfer process while maintaining parallel processing benefits.
Solution Approach 2:
The buffer performs preliminary storage of filtering results before the actual transfer to external memory occurs. By pre-storing results in the buffer, the system can prepare data in advance and transfer it in a more organized manner, reducing the complexity of coordinating multiple parallel streams with external memory.
2Productivity
If multiple deblocking filter circuits process macroblocks in parallel at different positions, then processing efficiency is improved, but the burden on external memory increases due to coordinated transfer requirements
Solution Approach 1:
The buffer acts as a mediator that collects filtering results from multiple deblocking filter circuits and consolidates them before transferring to external memory. This intermediary structure reduces the direct burden on external memory by providing a single, organized transfer interface rather than multiple coordinated transfers from different circuit positions.
3Adaptability or versatility
If deblocking filter circuits operate independently at different timings, then processing flexibility is improved, but the difficulty of synchronizing transfers to external memory increases
Solution Approach 1:
The buffer serves as a timing-absorbing intermediary that allows deblocking filter circuits to operate independently at different timings. Each circuit can complete its filtering operation and place results in the buffer at its own pace, while the buffer manages the timing differences and provides synchronized access when transferring to external memory, thus eliminating synchronization complexity.
Solution Approach 2:
The buffer performs preliminary storage of results before transfer, allowing independent operation of multiple circuits. Each circuit can complete its filtering task and deposit results in the buffer at its own timing, and the buffer prepares the consolidated data for transfer in advance, eliminating the need for complex synchronization protocols.
Data Source
AI summary
A moving image processor includes a first and a second moving image processing unit which are able to perform parallel operation, and a data transfer unit having a first buffer and a second buffer. The first moving image processing unit processes macroblocks MB00, - - - , of one row of one image sequentially, and the second moving image processing unit processes macroblocks MB10, - - - , of the next row sequentially. The first and the second moving image processors include a first and a second deblocking filters, respectively. Operation timing of the second filter is delayed by the processing time of two macroblocks, compared with operation timing of the first filter. The processing results of the first filter and the second filter are transferred to an external memory via the first buffer and the second buffer of the transfer unit.