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Proceedings Paper

Mobile phone imaging module with extended depth of focus based on axial irradiance equalization phase coding
Author(s): Hsin-Yueh Sung; Po-Chang Chen; Chuan-Chung Chang; Chir-Weei Chang; Sidney S. Yang; Horng Chang
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Paper 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.

Paper Details

Date Published: 24 January 2011
PDF: 9 pages
Proc. SPIE 7876, Digital Photography VII, 787606 (24 January 2011); doi: 10.1117/12.872260
Show Author Affiliations
Hsin-Yueh Sung, National Tsing Hua Univ. (Taiwan)
Industrial Technology Research Institute (Taiwan)
Po-Chang Chen, Industrial Technology Research Institute (Taiwan)
Chuan-Chung Chang, Industrial Technology Research Institute (Taiwan)
Chir-Weei Chang, Industrial Technology Research Institute (Taiwan)
Sidney S. Yang, National Tsing Hua Univ. (Taiwan)
Horng Chang, Industrial Technology Research Institute (Taiwan)


Published in SPIE Proceedings Vol. 7876:
Digital Photography VII
Francisco H. Imai; Feng Xiao, Editor(s)

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