Multiframe-Based High Dynamic Range Monocular Vision System for Advanced Driver Assistance Systems

In this paper, we propose a monocular multiframe high dynamic range (HDR) monocular vision system to improve the imaging quality of traditional CMOS/chargecoupled device (CCD)-based vision system for advanced driver assistance systems (ADASs). Conventional CMOS/CCD image sensors are confined to limited dynamic range that it impairs the imaging quality under undesirable environments for ADAS (e.g., strong contrast of bright and darkness, strong sunlight, headlights at night, and so on). Contrary to current HDR video solutions relying on expensive specially designed sensors, we implement a multiframe HDR algorithm to enable one common CMOS/CCD sensor capturing HDR video. Key parts of the realized HDR vision system are: 1) circular exposure control; 2) latent image calculation; and 3) exposure fusion. We have successfully realized a prototype of monocular HDR vision system and mounted it on our SetCar platform. The effectiveness of this technique is demonstrated by our experimental results, while its bottleneck is the processing time. By exploring the capability of the proposed method in the future, a low-cost HDR vision system can be achieved for ADAS.