Jia Yu

Ocean University of China | OUC

Plankton is the base of the ocean ecosystem and is very sensitive to changes in their environment. Thus, monitoring the status of plankton in-situ has incredible importance for environmental study. Hologram is one of the most effective methods to record the plankton’s living status underwater. However, the reconstruction of holograms, conventionall...

Due to the limited processing accuracy of the platform and unevenness of the glass substrate itself, a holographic lithography system is prone to out-of-focus imaging problems; therefore, the real-time focusing components are critical for holographic lithography systems. In this paper, a real-time focus monitoring and adjusting system using an elec...

Plankton is one of the most basic components in the marine ecosystem. The community structure and population change of plankton are the important ecological information to reflect the environmental situation. As the fundamental parameter of plankton community structure, size spectrum is very useful for the evaluation of marine ecosystem. In this pa...

Plankton size spectra monitoring is crucial for managing and conserving aquatic ecosystems. Thus, we develop an in situ size spectra monitoring system to obtain the size spectra of plankton and the information of their living status underwater. The system consists of an imaging unit and an information processing unit. The imaging part applies a dar...

To improve the efficiency and accuracy of measuring the size of fish, a parallel binocular stereo vision system is established to get the size of fish. According to the principle of binocular vision, first of all, to make use of the synthetic images of concentric circles as the calibration board, the location of the cameras is got. Next based on Ha...

An automatic method of making color coded synthesized Fourier transform hologram is proposed. The images of the three-dimensional model are processed by the principle of synthesized holography and the pseudo color coding method. The processed images are displayed by a spatial light modulator (SLM). The light, through the SLM and the Fourier transfo...

A new method of making three-dimensional hologram by laser direct wrinting system was proposed, which was based on the principle of CGH and combined stereo holography. First, the experiment of fresnel computer generated hologram was conducted and the results demonstrated that it is feasible and rational to combine CGH with stereo holography. Then t...

For face 3D reconstruction, a color 3D reconstruction method was put forward based on RGB laser scanning system. First, the mapping relationship between the pix-coordinates and the world- coordinates was determined by using a calibration plate; and a standard color plate was used for calibrating the RGB color data, in which the value acquired by di...

Linear structured light scanning is a common method for three dimensional (3D) detection, which is used to detect the targets both in water and air. A method for achieving simultaneously 3D and color information is proposed based on the line scanning system. The true color and 3D information of underwater object can be reconstructed based on the pr...

In order to solve the problem of phase distortion in the micro size (<1 mm) transmitting objects measurement based on digital holographic microscopy, a new correction method was proposed. By improving the pre-amplification off-axis Fresnel digital holographic recording system and convolution reconstruction algorithm, the phase distortion including...

This paper proposes a new method for three-dimensional dynamic holographic display that combines computer generated holography (CGH) and holographic stereogram. Theoretically, three-dimensional (3D) dynamic holographic display can be achieved by using CGH alone, however the application of CGH is still limited because large amounts of data processin...

Due to the absorption and scattering of water, images acquired in underwater environment have different colors from those in air, which can cause problem for image processing and object recognition. Addressing the problem of color correction, this paper presents a method of color restoration based on water absorption spectrum. Considering the nonli...

Laser line scanning (LLS) as an optical 3D survey method is recently used for underwater 3D imaging. This paper presents an approach for both 3D reconstruction and color restoration based on the LLS system. The system is set up with RGB laser scanning components for acquiring 3D data and color data at the same time. Direct calibration algorithms an...

The combination of ROV and the seafloor-based sensors networks has become a mainstream medium to explore the world under water. As the task becomes more diversified, the data volume of the communication between the ROV and the sensor node grows increasingly. Although the light can not perform the long-distance propagation as the acoustic signal und...

Detection of underwater bubbles is one of the key issues of the research of ocean-atmosphere flux exchange. Digital holographic experiment is carried out based on Mach-Zehnder digital holographic system, to detect the distribution of bubbles. Holographic images of the dynamical bubble fields are recorded by the chargecoupled device (CCD) video syst...

Based on making holographic lampbox backlights need, the possibility of using LEDs as the illumination sources for reconstruction of color holograms is studied on chrominance, compared with tungsten halogen spotlights which are common practiced currently. And the reproduced images those are displayed by a LED and a tungsten halogen spotlight are ev...

For making white reproduction, large viewing zone, full-parllax synthesis holograms, the direct writing method is put forward. Based on the digital image processing technology and the principle of stereogram hologram, the experiment produced a hologram with a large viewing zone of 57°. And holograms have achieved a 1×1 m2 large-scale splicing.

Based on a nonhydrostatic numerical ocean model developed by one of the authors, the interaction of an internal solitary wave with a step-type topography was investigated. Over the step topography, the flow pattern could be classified into three categories: 1) the propagation and spatial structure of the internal solitary wave was little influenced...

The purpose of the present work was to investigate the effects of carotenoid on the spectroscopic examination of human blood serum by simulating the metabolizability of the carotenoid and porphyrin during the development of cancer and by studying the fluorescence of them. Blood serum was prepared with blood sample from elbow vein and the luminescen...