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    • 4. 发明授权
    • Differential video image compression in holographic media
    • 全息介质中的差分视频图像压缩
    • US5877873A
    • 1999-03-02
    • US685623
    • 1996-07-24
    • Matthew C. BashawJohn F. HeanueLambertus Hesselink
    • Matthew C. BashawJohn F. HeanueLambertus Hesselink
    • G03H1/10G11B7/0065G11C13/04G03H1/28
    • G03H1/10G11B7/0065G11C13/042G03H2001/2675G03H2210/11G03H2210/12G03H2210/22G03H2260/54
    • A video image F�k! is identified as a basis image and stored as a basis page S�k! in a holographic storage medium. A subsequent image F�k+n! is stored by recording in the medium a page S�k+n!=F�k+n!-a�k!F�k!, where a�k!.noteq.0 and preferably a�k!=1. The page S�k! is recorded with a reference beam R�k!, while S�k+n! is recorded with a reference beam R�k+n! orthogonal to R�k!. The basis page is reset whenever the average intensity of a page to be stored exceeds a predetermined threshold. An image F'�k! is retrieved by reading basis page S�k! and letting F'�k!=S�k!. Subsequent images F'�k+n! are retrieved as S�k+n!+b�k!S�k!, where b�k!.noteq.0 and preferably b�k!=a�k!=1. The page addition step is performed coherently, i.e. by accessing the medium with a reference wave function R�k+n!+b�k!R�k!. The coherent addition is achieved by using a compound phase-and-amplitude modulator in a phase-code-multiplexed system, and by simultaneously accessing the storage medium at two different angles in an angle-multiplexed system. Differential video compression leads to a reduction in interpage crosstalk and to a capacity increase in crosstalk-limited memories. Optical page-by-page addition allows fast readout and eliminates the need for a time-consuming electronic decompression step.
    • 视频图像F [k]被识别为基础图像并作为基本页S [k]存储在全息存储介质中。 通过在介质中记录S [k + n] = F [k + n] -a [k] F [k]来存储后续图像F [k + n],其中a [k] a [k] = 1。 以参考光束R [k]记录页S [k],而用与R [k]正交的参考光束R [k + n]记录S [k + n]。 每当要存储的页面的平均强度超过预定阈值时,基页被重置。 通过读取基本页S [k]并使F'[k] = S [k]来检索图像F'[k]。 随后的图像F'[k + n]被检索为S [k + n] + b [k] S [k],其中b [k] NOTEQUAL 0并且优选地b [k] = a [k] = 1。 相干地执行页面添加步骤,即通过访问具有参考波函数R [k + n] + b [k] R [k]的介质。 通过在相位码复用系统中使用复合相位和幅度调制器,并且在角度多路复用系统中以两个不同的角度同时访问存储介质来实现相干相加。 差分视频压缩导致分组串扰的减少和串扰限制存储器的容量增加。 光学逐页添加允许快速读出,并且不需要耗时的电子减压步骤。