A novel adaptive logarithmic digital pixel sensor |
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Authors: | A Bermak A Kitchen |
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Institution: | Dept. of Electron. & Comput. Eng., Univ. of Sci. & Technol., Kowloon, China; |
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Abstract: | A major problem associated with complementary metal-oxide-semiconductor and charge couple device imagers is their limited dynamic range (DR), typically 60-70 dB. This falls far short of covering the wide illumination ranges found in natural scenes (typically 120-140 dB). Biological retinas are known to feature adaptive, logarithmic-type responses enabling them to cover a very wide DR, without compromising the resolution. This letter presents a novel way to realize such an adaptive logarithmic response by combining a digital time domain vision sensor and a simple adaptive digital quantizer. This letter presents the theory and experimental results for an adaptive logarithmic response sensor featuring over 100-dB DR. |
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