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applied sciencesArticleHolographic 3D Display Utilizing Depth Maps Generated by 2D-to-3D Rendering ApproachZehao He, Xiaomeng Sui and Liangcai Cao State Crucial Laboratory of VBIT-4 Formula Precision Measurement Technologies and Instruments, Division of Precision Instruments, Tsinghua University, Beijing 100084, China; [email protected] (Z.H.); [email protected] (X.S.) Correspondence: [email protected]: Holographic show has the prospective to become utilized in many 3D application scenarios because it provides all the depth cues that human eyes can perceive. Even so, the shortage of 3D content material has restricted the application of holographic 3D displays. To enrich 3D content for holographic show, a 2D to 3D rendering approach is presented. In this process, 2D images are firstly classified into three categories, such as Thromboxane B2 medchemexpress distant view photos, perspective view photos and close-up photos. For each category, the computer-generated depth map (CGDM) is calculated making use of a corresponding gradient model. The resulting CGDMs are applied inside a layer-based holographic algorithm to obtain computer-generated holograms (CGHs). The properly reconstructed region on the image alterations using the reconstruction distance, giving a natural 3D display effect. The realistic 3D effect tends to make the proposed approach could be applied in a lot of applications, including education, navigation, and wellness sciences in the future. Key phrases: 3D display; holographic display; 2D-to-3D; depth mapsCitation: He, Z.; Sui, X.; Cao, L. Holographic 3D Show Using Depth Maps Generated by 2D-to-3D Rendering Strategy. Appl. Sci. 2021, 11, 9889. https://doi.org/10.3390/ app11219889 Academic Editor: Andr M quez Received: 22 September 2021 Accepted: 21 October 2021 Published: 22 October1. Introduction Holography can be a technologies which can develop mathematical and physical connections in between targets and holographic fringes. Hence, it has been broadly employed inside the fields of 3D imaging and 3D display. In the field of 3D imaging, captured holographic fringes are frequently employed to reconstruct corresponding targets [1]. Applications of holographic imaging consist of sonar [4], radar [5], microscopy [6], et al. In the field of 3D show, holographic fringes are often calculated from targets by algorithms [7]. As the holographic show can provide all the depth cues that human eyes are capable of perceiving, it really is regarded as a promising choice for 3D display [103]. It has the possible to be utilized in quite a few augmented reality (AR) application scenarios, which includes video education [14,15], spatial cognition and navigation [16], and well being sciences [17]. Currently, the shortage of 3D content limits the application of holographic 3D displays. Three-dimensional acquisition devices, such as light-field cameras [18] and time-of-flight (TOF) cameras [19], are regarded as the answer to generate 3D content. For light-field cameras, the high quality of image reduces with the shooting distance [20]. The additional processes which can be essential to address this challenge [21] boost technique complexity. For most TOF cameras, the resolution is insufficient, major to reduce top quality displays with limited definition. Additionally, the production of 3D content by 3D acquisition devices is pricey and hardware intensive. Moreover, current 2D content material can’t be completely utilized in 3D acquisition devices. 2D-to-3D rendering supplies an option choice to enrich 3D content. Several capabilities, like edge [22,23].