3D Color Correction Memory System with Parallel Bank Access
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Solution Overview
Problem
Conventional color correction systems in camera image processing pipelines are limited in flexibility and efficiency, particularly in translating linear sensor RGB space to an RGB image output space, leading to suboptimal color reproduction and increased memory requirements when performing 3D color correction.
Innovation Solution
A high-performance memory system with eight banks, where each bank stores a portion of a 3D color correction lookup table, allowing parallel access to the eight closest table entries, with table entries assigned based on the least significant bits of the index, enabling efficient interpolation and minimizing memory size increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single large lookup table is used for 3D color correction, then color reproduction quality is improved, but memory size and access time increase significantly
Solution Approach 1:
The patent divides the large 3D color correction lookup table into eight separate memory banks, each storing a portion of the table. This segmentation allows the system to access only the necessary portions of the lookup table simultaneously, reducing the memory size requirement while maintaining color reproduction quality through parallel access to multiple table entries.
2Quantity of substance
If conventional sequential memory access is used for 3D color correction, then memory size can be kept small, but processing speed and productivity decrease
Solution Approach 1:
The patent introduces a bank selection dimension based on the least significant bits of the lookup table indices. By using 3 bits from the indices to select which memory bank to access, the system enables parallel retrieval of multiple lookup table entries in a single memory cycle, dramatically increasing processing speed without requiring proportionally larger memory.
3Loss of time
If eight memory banks are used for parallel access to eight nearest table points, then access time is reduced to one clock cycle, but device complexity increases
Solution Approach 1:
The patent implements self-service address routing where the least significant bits of the lookup table indices automatically determine which memory bank should be accessed. This eliminates the need for complex external address routing logic or control circuits, as the memory subsystem itself uses the index bits to select the appropriate bank, reducing overall device complexity while achieving fast parallel access.
4Measurement precision
If flexible 3D color correction mapping is implemented, then color reproduction quality is improved, but adaptability requirements and system complexity increase
Solution Approach 1:
The patent creates a universal memory access pattern that works for any 3D color correction lookup table. By using the least significant bits of the indices to select memory banks, the same memory architecture supports various color spaces and correction algorithms without requiring changes to the memory access mechanism, thereby providing flexible color reproduction while avoiding additional complexity.
Data Source
AI summary
An apparatus including a memory, a first circuit and a second circuit. The memory may be divided into eight banks. Each bank may store a portion of a three-dimensional (3D) color correction lookup table. The first circuit may be configured to address the memory in response to an index of an input point. The second circuit may be configured to arrange outputs of the eight banks for color interpolation.