High dynamic range imaging technology for micro camera array

Signal and Information Processing Association Annual Summit and Conference (APSIPA), 2014 Asia-Pacific Pub Date : 2014-12-01 DOI:10.1109/APSIPA.2014.7041726

Po-Hsiang Huang, Yuan-Hsiang Miao, Jiun-In Guo

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引用次数: 3

Abstract

Micro lens captures less light than normal lens dose, which makes low quality noise image, and current image sensor cannot preserve whole dynamic range in real world. HDR image with multi-exposure image overcomes the problems mentioned above. Choosing good exposure time is a seldom-discussed but important issue in HDR imaging technology. In this paper we propose a Histogram Based Exposure Time Selection (HBETS) method to automatically adjust proper exposure time of each lens for different scenes. Adopting the proposed weighting function restrains random distributed noise caused by micro-lens and produces a high quality HDR image. An integrated tone mapping methodology, which keeps all details in bright and dark parts when compressing the HDR image to LDR image for being displayed on monitors, is proposed. The result image has extended the dynamic range, that is, comprehensive information is provided. Eventually, we have implemented the proposed 4-CAM HDR system on Adlink MXC-6300 platform that can reach VGA video@10 fps.

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微相机阵列的高动态范围成像技术

微透镜捕获的光量比普通透镜少，导致图像噪声质量较低，目前的图像传感器无法在现实世界中保持整个动态范围。多曝光HDR图像克服了上述问题。在HDR成像技术中，选择良好的曝光时间是一个很少被讨论但又很重要的问题。本文提出了一种基于直方图的曝光时间选择(HBETS)方法来自动调整不同场景下每个镜头的曝光时间。采用该加权函数抑制了微透镜引起的随机分布噪声，得到了高质量的HDR图像。提出了一种将HDR图像压缩成LDR图像在显示器上显示时，保留所有细节在明暗部分的综合色调映射方法。结果图像扩展了动态范围，即提供了全面的信息。最终，我们在Adlink MXC-6300平台上实现了所提出的4-CAM HDR系统，达到VGA video@10 fps。

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Signal and Information Processing Association Annual Summit and Conference (APSIPA), 2014 Asia-Pacific

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