S&M Young Researcher Paper Award 2020
Recipients: Ding Jiao, Zao Ni, Jiachou Wang, and Xinxin Li [Winner's comments]
Paper: High Fill Factor Array of Piezoelectric Micromachined
Ultrasonic Transducers with Large Quality Factor

S&M Young Researcher Paper Award 2021
Award Criteria
Notice of retraction
Vol. 32, No. 8(2), S&M2292

Print: ISSN 0914-4935
Online: ISSN 2435-0869
Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
Sensors and Materials
is covered by Science Citation Index Expanded (Clarivate Analytics), Scopus (Elsevier), and other databases.

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S&M2649 Research Paper of Special Issue

Shadow Removal Method for Single Image Based on Instant Learning

Tianjun Zhu, Zhiliang Zou, Tunglung Wu, Jianying Li, Bin Li, Rui Song, Qianyu Song, Sanmiao Du, and Hegao Wan

(Received March 24, 2021; Accepted June 11, 2021)

Keywords: shadow removal, instant learning, offset correction, illumination estimation, enhancement

In this paper, a simple user-aided, robust, and high-quality fast shadow removal method is proposed. Firstly, an instant learning method is used to remove the shadow of an image, guided by input from the user of two rough areas of shadow and lighting pixels from which the initial shadow mask for shadow removal is derived. Secondly, the detected shadow image is offset and corrected to eliminate the influence of ambient light by a simple input of a color sampling line indicating the rate of change of illumination of the shadow region, penumbra region, and luminance region pixels. Clustering and illumination estimation then are performed for the corrected images. Meanwhile, the shadow is removed by calculating the statistical distribution of the shadow-free regions, and the lighting is restored by estimating the illumination scaling factor. Finally, the energy function used for illumination optimization can perform smooth estimation and image enhancement of the area after shadow removal. Experiments show that our proposed algorithm can generate high-quality shadow-free images and deal with difficult scenes with various texture types and uneven shadows.

Corresponding author: Zhiliang Zou




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