像素级对比度增强电路，可实时自适应调节图像明暗
In-Pixel Foreground and Contrast Enhancement Circuits with Customizable Mapping
- 在像素内直接处理图像，支持前景强化与对比度增强双模式
- 前景增强时使对比度比提升近6倍（米切尔对比度比）
- 支持设计阶段和运行时定制，适合动态光照环境应用
本文提出一种创新的像素级对比度增强电路，可在像素电路内部直接进行图像处理。该电路可配置为不同工作模式：在前景增强模式下，能将低强度背景像素抑制至接近零，从而突出前景以提升物体可见性；在对比度增强模式下，则整体提升图像对比度。其增强功能可在设计阶段及运行时灵活定制，使电路能适应特定应用场景与变化的光照条件。构建了所设计像素电路的模型并应用于完整像素阵列，仿真结果表明，在前景增强模式下，米切尔对比度比（Michelson Contrast Ratio, CR）提升接近6倍。仿真验证了该电路在多种成像环境下实现实时、自适应对比度增强的潜力。
原文摘要 · Abstract (English)
This paper presents an innovative in-pixel contrast enhancement circuit that performs image processing directly within the pixel circuit. The circuit can be tuned for different modes of operation. In foreground enhancement mode, it suppresses low-intensity background pixels to nearly zero, isolating the foreground for better object visibility. In contrast enhancement mode, it improves overall image contrast. The contrast enhancement function is customizable both during the design phase and in real-time, allowing the circuit to adapt to specific applications and varying lighting conditions. A model of the designed pixel circuit is developed and applied to a full pixel array, demonstrating significant improvements in image quality. Simulations performed in HSPICE show a nearly 6x increase in Michelson Contrast Ratio (CR) in the foreground enhancement mode. The simulation results indicate its potential for real-time, adaptive contrast enhancement across various imaging environments.
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