It is a key problem to get the high resolution and large field of view of dynamic measurement in the ladar technology. In this paper, Charge Coupled Device was synthesized with seams to be a display unit. A reconstruction method is proposed which combines the principles of synthetic aperture and phase retrieval to detect the particle target. Then the non-integer pixel stitching error in a synthetic-aperture ladar with seams is corrected by a method based on the shift theorem of the Fourier transform. In the X experiment, the correlation coefficient of surface l is 0.73217 between the reconstructed image and the simulated particles target image. The pictures from the experiment depicts the particle is not only clearly visible at the normal region but also at the seams. The target information can be recovered well of the high resolution and large field of view with this method.
It is a key problem to get the high resolution and large field of view (FOV) of dynamic measurement in the display technique. In this paper, Charge Coupled Device (CCD) was synthesized with seams to be a display unit. A reconstruction method is proposed which combines the principles of synthetic aperture and phase retrieval to detect the 3D particle target with synthetic CCD. In the simulation experiment, the correlation coefficient of surface l is 0.73217 between the reconstructed image and the simulated particles target image. The pictures from the experiment depicts the particle is not only clearly visible at the normal region but also at the seams. The optical information can be recovered well of the high resolution and large field of view (FOV) with this method.
KEYWORDS: Digital holography, Holograms, 3D image reconstruction, Particles, Image quality, Charge-coupled devices, Digital recording, CCD cameras, Digital imaging, Diffraction
In this paper, we propose a new reconstruction method for the synthetic aperture on-axis digital hologram with seams, and then evaluate it thoroughly. This method combines the principles of synthetic aperture and phase retrieval. It is applied to the experiment of the particle field detection. In the experiment, the pictures depict the particle is not only clearly visible at the normal region but also at the seams. With error analysis in reconstruction, method of correcting stitching errors improves accuracy furtherly. Therefore, the method proposed in this paper can effectively restrain the influence on the reconstructed image due to the loss of information at the seams and can achieve high-quality reconstructed image from the seamed stitching synthetic aperture on-axis digital hologram. It can be widely used in the diagnostic domain with high resolution and large visual field.
In the photographic process with Charge Coupled Device (CCD), the image sampling of CCD is important. Due to the previous incorrect mathematical descriptions of the sampling, a correct mathematical equation is given by analyzing the CCD image acquisition process. Comparing the previous and the given one, shortcomings of the previous are pointed out. Then, a detailed spectrum analysis of the image sampling is carried out which illustrates the influence of various parameters of CCD on image acquisition. The mathematical analysis can optimize the choice of the parameters of CCD in practical applications.
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