We present a novel structure based on differential optical path (DOP). The performance of three-dimensional ghost imaging (3DGI) is improved by DOP with high sensitivity and suppressed common noise because of the benefits of extracting zerocrossing point (i.e., interesting target position). Simulation results agree well with the theoretical analysis. Moreover, the relation between time slice and the signal-noise-ratio of 3DGI is discussed, and the optimal differential distance is obtained, thus motivating the development of a high-performance 3DGI.
KEYWORDS: Super resolution, Biomimetics, Retina, Image resolution, Visual process modeling, Imaging systems, Image processing, Image restoration, Statistical modeling, Signal to noise ratio
A novel super resolution reconstruction method is proposed to improve super resolution image performances. The proposed method uses bionic vision sampling model to obtain low resolution images and performs super resolution reconstruction in logarithmic polar coordinates. We carry out comparative experiments between the proposed method and the traditional method in terms of Peak Signal to Noise Ratio (PSNR), Structural Similarity Index Measure (SSIM) and Mean Squared Error (MSE). The results show that the performances of proposed method are better than that of the traditional method. Especially the SSIM of global image (butterfly), the proposed method is 34.45% higher than the traditional method.
The integrated model of echo laser pulse (ELP) of a target with arbitrary shape is studied under the condition of the ELP affected by target and atmospheric turbulence simultaneously. The ELPs of two typical targets (a plane and an aspherical surface) are employed to test the validity of the model by analytical expression. Based on simulations of the ELP under different targets and atmospheric turbulence intensity, the results show the ELP of a target with complicated surface is more easily affected by atmospheric turbulence than that with simple surface. Besides that, we study the relationship between the number of grids and the relative error of analytical expression, which is of interest to obtain the optimal number of grids used in the simulations.
Nowadays, lots of studies show the potential value of laser echo intensity in three-dimensional reconstruction of laser detection system. However, raw intensity information could not be used without correcting, since target geometry could also influence laser echo greatly. Target angle that is the angle between laser axis and target normal is important geometry information in intensity correcting. This paper studies the method to calculate target angle, which, as a result, could have great benefits in laser intensity correcting and further in three-dimensional reconstruction. The target angle could be calculated from the mathematical model between the target angle, distance and pulse width based on the laser space translation model presented. Simulation and experimental results show that, the method proposed can calculate the target angle effectively, which have great contribution in laser intensity correction and further in three-dimensional reconstruction.
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