Hardware Implementation of an Automatic Rendering Tone Mapping Algorithm for a Wide Dynamic Range Display

Journal of Low Power Electronics and Applications

Chika Ofili²  Stanislav Glozman¹ 

[1] VLSI Systems Center, Ben-Gurion University of the Negev, POB 653, Beer-Sheva 84105, Israel; E-Mail:;Integrated Sensors, Intelligent Systems (ISIS) Laboratory, Electrical and Computer Engineering Department, University of Calgary, Calgary, AB T2N 1N4, Canada; E-Mail:

关键词: tone mapping;    wide dynamic range (WDR);    high dynamic range (HDR);    CMOS image sensors;    hardware implementation;    field programmable gate array (FPGA);   

DOI  :  10.3390/jlpea3040337

来源: mdpi

【 摘 要 】

Tone mapping algorithms are used to adapt captured wide dynamic range (WDR) scenes to the limited dynamic range of available display devices. Although there are several tone mapping algorithms available, most of them require manual tuning of their rendering parameters. In addition, the high complexities of some of these algorithms make it difficult to implement efficient real-time hardware systems. In this work, a real-time hardware implementation of an exponent-based tone mapping algorithm is presented. The algorithm performs a mixture of both global and local compression on colored WDR images. An automatic parameter selector has been proposed for the tone mapping algorithm in order to achieve good tone-mapped images without manual reconfiguration of the algorithm for each WDR image. Both algorithms are described in Verilog and synthesized for a field programmable gate array (FPGA). The hardware architecture employs a combination of parallelism and system pipelining, so as to achieve a high performance in power consumption, hardware resources usage and processing speed. Results show that the hardware architecture produces images of good visual quality that can be compared to software-based tone mapping algorithms. High peak signal-to-noise ratio (PSNR) and structural similarity (SSIM) scores were obtained when the results were compared with output images obtained from software simulations using MATLAB.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.