Matwyschuk Alexis
Appl Opt. 2017 Jan 20;56(3):682-687. doi: 10.1364/AO.56.000682.
Having laid the foundations of the multiple-wavelength range-gated active imaging principle in flash mode in a previous paper, we have been studying its use in accumulation mode. Whatever the mode, the principle consists of restoring the 3D scene directly in a single image at the moment of recording with a camera. Each emitted light pulse with a different wavelength corresponds to a visualized zone with a different distance in the scene. So each of these visualized zones is identified by a different wavelength. In flash mode, the camera shutter opens just once during the emission of light pulses with the different wavelengths. However, the energy constraints to restore scenes in three dimensions can lead to a change in the recording mode when moving from the flash mode to the accumulation mode. In this mode, the cycle, including a series of light pulses with the used wavelengths and an aperture of the camera shutter, is repeated several times for a given image recorded with the intensified camera. Each wavelength always corresponds to a visualized slice with a different distance in the scene. So, the accumulation enables increasing the illumination of every visualized slice. The modeling conducted in the previous paper must be completed to adapt it to this mode. The tests with a multiple-wavelength laser source confirmed the quality improvement of the recorded images for more remote scenes and validated the principle of restoring, directly in a color image, the three dimensions of a scene.
在之前的一篇论文中奠定了多波长距离选通主动成像原理在闪光模式下的基础后，我们一直在研究其在累积模式下的应用。无论哪种模式，该原理都包括在相机记录的瞬间直接在单幅图像中恢复三维场景。每个发射的具有不同波长的光脉冲对应于场景中一个具有不同距离的可视化区域。因此，这些可视化区域中的每一个都由不同的波长来识别。在闪光模式下，相机快门在发射不同波长的光脉冲期间仅打开一次。然而，从闪光模式转换到累积模式时，在三维空间中恢复场景的能量限制可能会导致记录模式的改变。在这种模式下，对于用增强型相机记录的给定图像，包括一系列使用的波长的光脉冲和相机快门的一次开启的周期会重复多次。每个波长始终对应于场景中一个具有不同距离的可视化切片。所以，累积能够增加每个可视化切片的照明。必须完成之前论文中进行的建模以使其适应这种模式。使用多波长激光源进行的测试证实了对于更遥远场景记录图像的质量提升，并验证了直接在彩色图像中恢复场景三维的原理。
