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Volume: 28 | Article ID: art00007
Analog Current Mode Implementation of Global and Local Tone Mapping Algorithm for WDR Image Display
  DOI :  10.2352/ISSN.2470-1173.2016.12.IMSE-262  Published OnlineFebruary 2016

Tone mapping algorithms have been utilized to adapt wide dynamic range (WDR) images to limited dynamic range (LDR) displays while still maintaining images’ details. This work presents an analog current mode circuitry approach to realize a tone mapping algorithm that includes both global and local operations in the image array periphery. Compared with the other in-pixel analog implementations, this work can keep the best pixel pitch and fill factor performance of WDR image sensors. In addition, by using joint global and local tone mapping operators, details of the images are preserved and the contrast of the image is also enhanced when compared with other hardware implementations realizing only one of these operators. In this work, a novel WDR analog divider is designed and presented to handle the WDR input pixel value. The circuit, designed in a TSMC 0.35 µm complementary metal oxide semiconductor (CMOS) technology, was simulated with thirty WDR images in order to evaluate our implementation. Peak signal to noise ratio (PSNR) and structural similarity (SSIM) scores were calculated to evaluate the hardware simulation and compared to a software implementation in MATLAB.

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Peng Chen, Kartikeya Murari, Orly Yadid-Pecht, "Analog Current Mode Implementation of Global and Local Tone Mapping Algorithm for WDR Image Displayin Proc. IS&T Int’l. Symp. on Electronic Imaging: Image Sensors and Imaging Systems,  2016,

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