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.