- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Single-pixel 3D reconstruction via a high-speed LED array
摘要： Three-dimensional reconstruction can be performed in many ways, among which photometric stereo is an established and intensively investigated method. In photometric stereo, geometric alignment or pixel-matching between two-dimensional images under different illuminations is crucial to the accuracy of three-dimensional reconstruction, and the dynamic of the scene makes the task difficult. In this work, we propose a single-pixel three-dimensional reconstructioning system utilizing structured illumination, which is implemented via a high-speed LED array. By performing 500kHz structured illumination and capturing the reflected light intensity with detectors at different spatical locations, two-dimensional images of different shadows with 64×64 pixel resolution are reconstructed at 122 frame per second. Three-dimensional profiles of the scene are further reconstructed using the surface gradients derived by photometric stereo algorithm, achieving a minimum accuracy of 0.50 mm. Chromatic three-dimensional imaging via an RGB LED array is also performed at 40 frame per second. The demonstrated system significantly improves the dynamic performance of the single-pixel three-dimensional reconstruction system, and offers potential solutions to many applications, such as fast three- dimensional inspection.
关键词： 3D reconstruction,LED array,single-pixel imaging
更新于2025-09-23 15:21:01
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Principles and prospects for single-pixel imaging
摘要： Modern digital cameras employ silicon focal plane array (FPA) image sensors featuring millions of pixels. However, it is possible to make a camera that only needs one pixel. In these cameras a spatial light modulator, placed before or after the object to be imaged, applies a time-varying pattern and synchronized intensity measurements are made with a single-pixel detector. The principle of compressed sensing then allows an image to be generated. As the approach suits a wide a variety of detector technologies, images can be collected at wavelengths outside the reach of FPA technology or at high frame rates or in three dimensions. Promising applications include the visualization of hazardous gas leaks and 3D situation awareness for autonomous vehicles.
关键词： 3D imaging,computational imaging,spatial light modulator,compressed sensing,infrared imaging,single-pixel imaging,terahertz imaging
更新于2025-09-10 09:29:36
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Apodized Fourier single-pixel imaging by changing the contrast of patterns using Norton-Beer functions
摘要： Single-pixel imaging has attracted a lot of attention in the last two decades, not only for its imaging ability using a low-level or non-visible light but also for imaging through scattering media. As a special method, Fourier single-pixel imaging projects sinusoids on the object and measures Fourier spectrum using a single-pixel detector. As the information of many natural objects is concentrated in lower frequencies in Fourier space, fewer measurements are required for imaging these objects using Fourier single-pixel imaging. However, the sub-sampling of the Fourier space causes ringing artifacts in the retrieved images. In this paper, we propose changing the contrast of different sinusoids based on Norton-Beer functions and show its ability to reduce ringing artifacts (‘apodized’ Fourier single-pixel imaging). This method is investigated using one- and two-dimensional simulations by implementing Norton-Beer profiles in low-pass and band-pass modes. In this way, the two modes of apodized imaging and edge enhancement are performed during the measuring process. The feasibility of these modes is experimentally proved for a simple and real object. Furthermore, different ways of using varying-contrast patterns are compared with common post-process apodization. We believe that our study can be interesting for both single-pixel imaging and image processing communities.
关键词： computational imaging,apodization,single-pixel imaging,sinusoidal modulation
更新于2025-09-04 15:30:14