共查询到20条相似文献,搜索用时 15 毫秒
1.
针对某型高分辨率航空摄像机输出数据流达到每秒200兆字节,常规方法难于实现图像数据实时记录的问题,提出一种自启动多通道混合同步直写SCSI硬盘的方法.通过新设计的状态控制器,优化了SCSI硬盘的记录时序,使多个并行记录通道能根据数据缓存器和硬盘的状态自动产生独立的直写脉冲,以混合同步的方式将数据高速记录到硬盘上.实验结果表明:该方法可使图像数据持续记录速率达到每秒200兆字节,储存容量可达280吉字节,且结构简单、实用. 相似文献
2.
Guiying Chen Xin Liang Yizhe Yuan Guang Yang Chunping Zhang Tang Xu Q.W. Song 《Optik》2007,118(8):377-380
While two waves are coupled in bacteriorhodopsin (bR) film, a beam of incident light carrying the image is transferred to two diffraction beams whose intensities can increase from zero to a maximum and then decrease to a stable value with the increase of the writing time. Based on the relation among the polarization states of image in a recording beam and diffraction beams, we have proposed and demonstrated the all-optical image transfer switch which depends on the effective time and has the function that within the effective time, a polarization state image is automatically transferred to two images whose polarization states are perpendicular, and the transfer stops automatically beyond the effective time. A time-dependent all-optical image switch with muti-outputs is implemented. 相似文献
3.
视频图像记录判读系统 总被引:6,自引:0,他引:6
光电经纬仪的摄影胶片图像和CCD摄像机的视频图像的数字化处理是兵器试验靶场中始终未能很好解决的问题。主要源于两个问题:一是视频图像的数字化采集和转换;二是数字图像的自动处理。介绍了根据靶场广泛应用的光学图像记录、判读需求而研制的视频图像记录判读系统,并对所采用的视频图像实时存储技术、字符识别技术、目标识别与定位技术等几项主要的关键技术进行了说明,并给出了应用结果。结果表明,图像采集记录灵活方便,速度快,不丢帧;目标图像处理精度高,实时性强,自动处理能力好,使光测数据处理的精度和效率都有了很大的提高。 相似文献
4.
基于液晶光阀非线性变换的实时光学相关识别 总被引:4,自引:0,他引:4
提出了一种高鉴别能力的实时光学相关器,它采用液晶光阀作为实时输入器件,并利用其非线性变换特性对图像微分预处理,全息记录材料采用光折变晶体,且使用全取球面波作参考光。所给出的实验结果表明,该光学相关具有鉴别能力高,实时性和灵活性强,以及结构2紧凑的特点。 相似文献
5.
对多波长数字全息图的记录和再现像的彩色显示问题进行了研究.从菲涅耳近似算法出发,对在记录距离一定情况下,不同波长全息图数字再现像的像元所表示的几何尺寸会因波长不同而不同,从而导致各波长再现像无法重合的情况进行了讨论.通过理论分析,讨论了不同波长全息图像素数与再现像像元之间的关系、不同波长全息图记录距离与再现像像元之间的关系,据此得出的解决不同波长再现像重合问题的方法及其对再现像的影响和适用范围等问题;并对合成再现像中原始色彩信息改变及其解决办法进行了分析.通过无透镜傅里叶变换数字全息方法,以632.8 nm和532.0 nm两种波长的激光为光源,用单色CCD进行记录,验证了方法的可行性. 相似文献
6.
H. Schmalfuss 《Optics Communications》1976,17(3):245-246
Holographic observations through moving fog yield better images than ordinary photography does. Previously, holography through fog suffered from a time delay caused by the photographic development process of the hologram plate. Now we use the cathode of a TV tube for recording temporarily an image plane hologram of the object. This hologram is reconstructed at TV speed by means of an electronic high pass filter. The reconstructed image on the monitor is far superior over an ordinary image taken through the same fog. 相似文献
7.
It is demonstrated for the first time to the authors' knowledge that digital holographic image reconstruction can be applied to correction of image reconstruction in the presence of severe anamorphism and aberrations. It is shown that anamorphism and aberrations can be taken into account and compensated for separately to yield a correct-image reconstruction. Anamorphism and aberrations are introduced by a holographic recording system based on a reflective grating interferometer (RGI). The strong anamorphic behavior of the RGI prevents reconstruction of a correct image unless that behavior is compensated for in the process of numerical holographic reconstruction. 相似文献
8.
This paper describes a novel approach of acquiring two single-exposed, non-overlapping images using half frame image shift (HFIS) recording on photographic film. This technique permits the recording of two single-exposed, non-overlapping images of seed particles in a flow plane on high spatial resolution film with any arbitrary time delay between exposures. A new multigrid CCDPIV (MCCDPIV) analysis method is used to analyse the single-exposed, non-overlapping sequential images resulting in PIV measurements with a larger velocity dynamic range, lower random error and better spatial resolution than standard CCDPIV analysis. HFIS recording followed by MCCDPIV analysis was employed to measure the spatio-temporal evolution of the in-plane velocity vector and the out-of-plane vorticity fields of a turbulent starting jet at Reynolds numbers based on the orifice diameter and piston velocity of 10,780 and 13,860. 相似文献
9.
本文提出一种利用正、赝再现像,将物体的正、反两面信息复合在一起的全息术.在一张全息干板片上,可以同时看到物体的两面,增强立体效果和艺术感.文中介绍了原理、方法和结果. 相似文献
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11.
《Journal of magnetism and magnetic materials》2001,234(1):13-18
The paper deals with the problem of separating magnetic and non-magnetic contributions to the image contrast in the Bitter pattern method. With the help of the digital image difference procedure, it is demonstrated for the first time for the Bitter method that the separation is easy to achieve for relatively soft magnetic specimens, when an external field can be applied to simply produce the non-magnetic reference image of the specimen area under study. It is also shown that obtaining satisfactory results is principally impossible when removing the colloid from the specimen surface is used for the purpose of recording the non-magnetic image. 相似文献
12.
Real-time holographic recording and an improvement of the response time in ruthenium (Ru)-doped Bi(12)SiO(20) (BSO) crystal at 1064 nm is obtained. Using green light pre-exposure, a significant operation speed of 60 ms is achieved. In addition, the ability for image reconstruction is demonstrated in Ru-doped BSO, supporting further applications as reversible media for real-time image processing at the near-IR spectral range. 相似文献
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14.
Holographic data storage is being widely studied for the purpose of developing next-generation large optical memories. A prospective
use of this type of memory is in building image archives in large-scale data centers. In particular, demand for energy conservation
at data centers, and therefore for holographic data storage, is growing. In holographic data storage, interference between
bits occurs owing to wave aberration in the optical system, shrinkage of the medium, and crosstalk noise from neighboring
holograms during multiplex recording; as a result of the interference, the reproduced image deteriorates and the bit error
rate (BER) increases. In this study, to reduce the BER in both off-axis-type recording and coaxial-type recording, a two-dimensional
finite impulse response (FIR) filter is applied to a reproduced image that has been recorded by angle multiplex recording
and shift multiplex recording. First, for the optimization of the FIR filter coefficients, the linear minimum mean square
error (LMMSE) method is applied; this method optimizes the coefficients by reducing the BER. Furthermore, for evaluating the
optimization performance of the LMMSE method, the optimization performance is compared with that of the real-coded genetic
algorithm (RCGA), which has the capability to search a wide range of coefficients. The optimization by the LMMSE method has
been found to be excellent for off-axis-type recording but not for coaxial-type recording. It is speculated that this is because
of the brightness irregularity in the reproduced image, resulting from crosstalk. On the other hand, a marked reduction in
the BER is observed using the RCGA, despite the brightness irregularity. In this study, the effectiveness of the LMMSE method
for signals recorded by coaxial-type recording, in which large brightness irregularity is expected, is examined using automatic
gain control (AGC). It is found that the application of AGC reduces the BER even in the case of coaxial-type recording. 相似文献
15.
单波长记录二维真彩色全息图的一种新方法 总被引:1,自引:0,他引:1
提出一种方法,用新型的光学元件-三通道光纤面板作为分色与合成元件,使得单波长真彩色全息图的制作大为简化,而且能够提高全息图再现像的亮度和色饱和度。 相似文献
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17.
Holographic single-component diffuse screens based on on-axis transmission holograms are studied theoretically and experimentally.
The configurations of extra holographically reconstructed images of the diffuse screen (conjugate image, halo, and zeroth-order
spot) are analyzed. A so-called centered hologram is suggested in which the conjugate image of the diffuse screen spatially
coincides with the main image, thereby eliminating distortions inserted by the conjugate image. Also, hologram recording using
a Mach-Zender interferometer is suggested and implemented. Such an approach makes it possible to eliminate the shadow of an
object on the hologram. It is noted that, in recording a planar diffuse screen, the presence of the halo does not distort
the image of an object projected through the screen: only the light intensity is partially lost. Analysis of the images projected
shows that the luminance of the zeroth-order spot, while relatively low, should be diminished in one way or another. 相似文献
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19.
A simple experimental method of eliminating zero-order diffraction in the reconstructed image of off-axis digital holography is presented. Holographic diffraction grating acting as a beam splitter, an off-axis holography system is formed. The holograms of object with different recording parameters are obtained by adjusting the reflecting mirror in the recording optical system to vary the incidence orientation of the object beam in CCD to introduce a phase shift. The zero-order image can be eliminated by numerically processing the holograms of object with different recording parameters. The theoretical analyses have been done in detail and the experimental results are also given. The zero-order image eliminated, the area of reconstructed image increases remarkably, the image quality can then be significantly improved and the better resolution obtained. The experimental results show that the method presented in this paper is feasible, simple in optical system and easy in operation and data processing. 相似文献