QUALITY ASSESSMENT BASED CODED APERTURES FOR DEFOCUS DEBLURRING

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MASOUDIFAR MINA; POURREZA HAMID REZA

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Journal Paper

Paper Information

Journal: Journal of Information Systems and Telecommunication Year:2016 | Volume:4 | Issue:2 Page(s): 106-116

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Title

QUALITY ASSESSMENT BASED CODED APERTURES FOR DEFOCUS DEBLURRING

Author(s)

MASOUDIFAR MINA | POURREZA HAMID REZA | Issue Writer Certificate

Keywords

CODED APERTURE

BLUR

DEFOCUS

COMPUTATIONAL IMAGING

IMAGE QUALITY ASSESSMENT

Abstract

A conventional camera with small size pixels may capture images with DEFOCUSed BLURred regions. BLURring, as a low-pass filter, attenuates or drops details of the captured image. This fact makes deblurring as an ill-posed problem. CODED APERTURE photography can decrease destructive effects of BLURring in DEFOCUSed images. Hence, in this case, aperture patterns are designed or evaluated based on the manner of reduction of these effects. In this paper, a new function is presented that is applied for evaluating the aperture patterns which are designed for DEFOCUS deblurring. The proposed function consists of a weighted sum of two new criteria, which are defined based on spectral characteristics of an aperture pattern. On the basis of these criteria, a pattern whose spectral properties are more similar to a flat all-pass filter is assessed as a better pattern. The weights of these criteria are determined by a learning approach. An aggregate IMAGE QUALITY ASSESSMENT measure, including an existing perceptual metric and an objective metric, is used for determining the weights. According to the proposed evaluation function, a genetic algorithm that converges to a near-optimal binary aperture pattern is developed. In consequence, an asymmetric and a semi-symmetric pattern are proposed. The resulting patterns are compared with the circular aperture and some other patterns in different scenarios.

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APA: Copy

MASOUDIFAR, MINA, & POURREZA, HAMID REZA. (2016). QUALITY ASSESSMENT BASED CODED APERTURES FOR DEFOCUS DEBLURRING. JOURNAL OF INFORMATION SYSTEMS AND TELECOMMUNICATION (JIST), 4(2), 106-116. SID. https://sid.ir/paper/332710/en

Vancouver: Copy

MASOUDIFAR MINA, POURREZA HAMID REZA. QUALITY ASSESSMENT BASED CODED APERTURES FOR DEFOCUS DEBLURRING. JOURNAL OF INFORMATION SYSTEMS AND TELECOMMUNICATION (JIST)[Internet]. 2016;4(2):106-116. Available from: https://sid.ir/paper/332710/en

IEEE: Copy

MINA MASOUDIFAR, and HAMID REZA POURREZA, “QUALITY ASSESSMENT BASED CODED APERTURES FOR DEFOCUS DEBLURRING,” JOURNAL OF INFORMATION SYSTEMS AND TELECOMMUNICATION (JIST), vol. 4, no. 2, pp. 106–116, 2016, [Online]. Available: https://sid.ir/paper/332710/en

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