In depth map super-resolution (SR), a high-resolution color image plays an important role as guidance for preventing blurry depth boundaries. However, excessive/deficient use of the color image features often causes performance degradation such as texture-copying/edge-smoothing in flat/boundary areas. To alleviate these problems, this letter presents a simple yet effective method for enhancing the performance of the SR without requiring significant modifications to the original SR network. To this end, we present a self-selective concatenation (SSC), which is a substitute for the conventional feature concatenation. In the upsampling layers of the SR network, the SSC extracts spatial and channel attention from both color and depth features such that color features can be selectively used for depth SR. Specifically, the SSC learns to use sufficient color features for rendering sharp depth boundaries, whereas their effects are reduced in smooth regions to prevent texture-copying. The proposed SSC can be included in any existing SR networks that have the encoder-decoder structure. The experimental results show that the proposed method can further improve the performances of existing SR networks in terms of the root mean squared error and peak signal-to-noise ratio.
Bibliographical noteFunding Information:
Manuscript received September 29, 2020; revised November 6, 2020; accepted November 15, 2020. Date of publication November 19, 2020; date of current version December 9, 2020. This work was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT Future Planning, under Grant NRF-2020R1F1A1069009. The associate editor coordinating the review of this manuscript and approving it for publication was Prof. Dezhong Peng. (Corresponding author: Seung-Won Jung.) Yoon-Jae Yeo, Min-Cheol Sagong, Seung-Won Jung, and Sung-Jea Ko are with the Department of Electrical Engineering, Korea University, Seongbuk-gu, Seoul 02841, South Korea (e-mail: email@example.com; firstname.lastname@example.org; email@example.com; firstname.lastname@example.org).
This work was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT Future Planning, under Grant NRF-2020R1F1A1069009.
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- Depth map super-resolution (SR)
- convolutional neural network
- deep learning
ASJC Scopus subject areas
- Signal Processing
- Electrical and Electronic Engineering
- Applied Mathematics