High dynamic range imaging and local adaptive tone mapping

Masayuki Ikebe

doi:10.1117/12.2035058

21 August 2013 High dynamic range imaging and local adaptive tone mapping

Masayuki Ikebe

Proceedings Volume 8908, International Symposium on Photoelectronic Detection and Imaging 2013: Imaging Sensors and Applications; 89082N (2013) https://doi.org/10.1117/12.2035058
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China

Abstract

We recently proposed a negative-feedback reset as a noise cancellation technique and showed that it can obtain intermediate image data during the charge-accumulation process. As an application, dynamic range compression is achieved by individually selecting pixels and by setting an intermediate voltage or performing quasi-holding with respect to each pixel. Additionally, we achieved dynamic range extending using multi-intermediate image readout. Since obtained images have global characteristics in their tone curves, local contrasts are degraded with simple HDR compression. Therefore local adaptive HDR compression is required. We propose an approach to generating a tone mapping function by using composite multiple gamma functions derived from local histograms. The multiple gamma functions represent the shadow, middle, and high-light tones of local-image areas. We can intuitively control the parameters of these three tones and suppress over-enhancement of images with LHE by using these multiple gamma functions. Moreover, we achieved two million pixels per 0.3 sec of operation and real-time movie correction (resolution: VGA, frame rate of 30fps) without the need for dedicated instructions or additional hardware by calculating the local histogram independent of the pixel-box size and using a look-up table for functions.

Citation Download Citation

Masayuki Ikebe "High dynamic range imaging and local adaptive tone mapping", Proc. SPIE 8908, International Symposium on Photoelectronic Detection and Imaging 2013: Imaging Sensors and Applications, 89082N (21 August 2013); https://doi.org/10.1117/12.2035058

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