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24 January 2011 Mobile phone imaging module with extended depth of focus based on axial irradiance equalization phase coding
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Proceedings Volume 7876, Digital Photography VII; 787606 (2011) https://doi.org/10.1117/12.872260
Event: IS&T/SPIE Electronic Imaging, 2011, San Francisco Airport, California, United States
Abstract
This paper presents a mobile phone imaging module with extended depth of focus (EDoF) by using axial irradiance equalization (AIE) phase coding. From radiation energy transfer along optical axis with constant irradiance, the focal depth enhancement solution is acquired. We introduce the axial irradiance equalization phase coding to design a two-element 2-megapixel mobile phone lens for trade off focus-like aberrations such as field curvature, astigmatism and longitudinal chromatic defocus. The design results produce modulation transfer functions (MTF) and phase transfer functions (PTF) with substantially similar characteristics at different field and defocus positions within Nyquist pass band. Besides, the measurement results are shown. Simultaneously, the design results and measurement results are compared. Next, for the EDoF mobile phone camera imaging system, we present a digital decoding design method and calculate a minimum mean square error (MMSE) filter. Then, the filter is applied to correct the substantially similar blur image. Last, the blur and de-blur images are demonstrated.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Hsin-Yueh Sung, Po-Chang Chen, Chuan-Chung Chang, Chir-Weei Chang, Sidney S. Yang, and Horng Chang "Mobile phone imaging module with extended depth of focus based on axial irradiance equalization phase coding", Proc. SPIE 7876, Digital Photography VII, 787606 (24 January 2011); https://doi.org/10.1117/12.872260
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