Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Optical processing

a technology of optical processing and optical fiber, applied in the field of optical processing, can solve the problems of limited acceptance and often demanding decompression, and achieve the effect of reducing interactions

Inactive Publication Date: 2005-07-07
LENSLET
View PDF71 Cites 29 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0018] An aspect of some embodiments of the invention relates to applying Fourier based transforms, such as a DCT transform using incoherent light systems. In some embodiments of the invention, a combination of dispersive element such that the one compensates for the other can be used. For example, a pair of conjugate zone plates are used to effect a Fourier transform, by providing a dispersive effect and correcting for the wavelength scaling. Alternatively, a zone plate combined with a suitable lens is provided. In an exemplary embodiment of the invention, one or more arrays of conjugate zone plates are provided in order to create a multi-channel system. Potential advantages of using incoherent light include (a) allowing direct processing of an incoming image; (b) reducing speckle effects; (c) allowing the light to always be real and non-negative, with the detected signal representing intensity, which may be more appropriate to cosine transform applications and to square-law detection devices; and / or (d) reducing complexity, since incoherent optical systems are often less sensitive to deformation of the components, such as the flatness of the spatial light modulator.

Problems solved by technology

Compression and in some cases decompression are often very demanding and typically require dedicated hardware.
However, with the advent of very fast electronic computer components and parallel processors, their acceptance has been limited.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Optical processing
  • Optical processing
  • Optical processing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0074]FIG. 1 is a flowchart of a base-line method 20 of JPEG-compliant compression. Image data is first transformed using the DCT (Discrete Cosine Transform) (22), to generate a set of coefficients. These coefficients are then quantized (24). The quantized coefficients are then unfolded from a 8×8 representation to a 64×1 representation (“Zig-Zag”, 26). These quantized coefficients are encoded using a variable-length encoding scheme (28), zero-run length encoded and then Huffman encoded (30), to reduce entropy. A compressed data file is then generated by prefixing the encoded data with header information (32). Other, similar, methods of JPEG compression are also known.

[0075] In accordance with an exemplary embodiment of the invention, various of the above steps are performed using optical elements, rather than using electronic or software elements. In the above described JPEG compression method, the step that is typically most computationally demanding, is the DCT step. Thus, in an...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A method of performing a DFT (discrete Fourier transform) or a DFT derived transform on data, comprising: providing spatially modulated light having spatial coherence, said spatially modulated light representing the data to be transformed; Fourier transforming said spatially modulated light, using an at least one optical element; and compensating for at least one of a scaling effect and a dispersion effect of said at least one optical element, using an at least one dispersive optical element.

Description

RELATED APPLICATIONS [0001] This application is a continuation in part of PCT application PCT / IL99 / 00479, filed Sep. 5, 1999, by applicant Lenslet Ltd. in the IL receiving office and designating the US, the disclosure of which is incorporated herein by reference.FIELD OF THE INVENTION [0002] The present invention relates to the field of optical processing and, in some embodiments, to compressing images using optical components. BACKGROUND OF THE INVENTION [0003] Often, the information bandwidth to be transmitted is greater than the available bandwidth. Therefore, information is often compressed before it is transmitted (or stored), to reduce the required bandwidth. For example, the HDTV standard was defined, at its inception, to include compression. Many types of signals are compressed, including still images, video and telephone conversations. The reigning compression standards are JPEG for still images and MPEG (I, II, III or IV) for video. In actuality, these standards are standa...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G02F3/00G02F1/01G06E1/04G06E3/00G06T7/20G06T9/00G06V10/88H04N7/30
CPCG06E3/005H04N19/60G06T7/206G06K9/58G06T7/262G06V10/88
Inventor MENDLOVIC, DAVIDGOLDENBERG, EFRAIMKONFORTI, NAIMZALEVSKY, ZEEVSARIEL, AVIRAM
Owner LENSLET
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products