×

Method for selecting reproduction quality of transmitted vector quantized data

  • US 5,247,348 A
  • Filed: 11/19/1991
  • Issued: 09/21/1993
  • Est. Priority Date: 11/19/1991
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of communicating image data from a first location to a second location, comprising the steps of:

  • (a) receiving image data to be transmitted, and converting the image data to an input vector;

    (b) defining a first codebook having a plurality N of levels of codevectors, the codevectors at each succeeding level of the first codebook representing a possible input vector with generally greater accuracy than the codevectors at a preceding level, each of the codevectors having an address associated therewith, and utilizing up to at least a selected level of the codevectors for comparison to the input vector;

    (c) selecting from the selected level the codevector that most closely resembles the input vector;

    (d) transmitting from the first location an indication of at least the address associated with the selected codevector; and

    (e) performing the following steps at the second location;

    (i) providing a second codebook having a plurality L of levels of codevectors, where L is a user selectable number between 1 and N inclusive, the codevectors of the L levels of the second codebook being substantially identical to the codevectors of a corresponding L levels of the first codebook, and identifying a selected level of the codevectors of the second codebook;

    (ii) receiving the transmitted indication from the first location, obtaining the address therefrom, and placing the obtained address in a form for addressing up to the selected level of the codevectors of the second codebook;

    (iii) retrieving from the second codebook the codevector residing at the obtained address to obtain a representation of the codevector selected in step (c);

    (iv) employing the codevector retrieved in step (iii) to substantially re-create the image data at the second location.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×