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Image information signal transmitting system with selective transmission of input data or extracted data

  • US 4,994,911 A
  • Filed: 03/20/1989
  • Issued: 02/19/1991
  • Est. Priority Date: 03/28/1988
  • Status: Expired due to Term
First Claim
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1. An image information signal transmitting system comprising:

  • (a) input means for inputting an image information signal composed of a plurality of picture element data corresponding to one picture;

    (b) storing means for storing the plurality of picture element data inputted by said input means by blocks each of which is composed of a predetermined number of picture element data;

    (c) extracting means for dividing the plurality of picture element data inputted by said input means into the blocks, for extracting from each of the blocks a fewer number of picture element data than the predetermined number of picture element data of which each of the blocks is composed, and for outputting the extracted picture element data;

    (d) interpolating means for interpolating picture element data which has not been extracted by said extracting means by using picture element data which has been extracted by said extracting means to restore the plurality of picture element data;

    (e) first computing means for comparing the plurality of picture element data inputted by said input means with the plurality of picture element data restored by said interpolating means for every one of the blocks to obtain differences therebetween, and for computing the sum of the differences for every one of the blocks to output the sum as first computed data;

    (f) second computing means for comparing the plurality of picture element data inputted by said input means with the plurality of picture element data stored by said storing means for every one of the blocks to obtain differences therebetween, and for computing the sum of the differences for every one of the blocks to output the sum as second computed data;

    (g) third computing means for computing and outputting third computed data by multiplying the first computed data output from said first computing means by a first constant, adding the result of multiplication to the second computed data output from said second computing means, subtracting a second constant from the result of addition and, after that, multiplying the result of subtraction by a third constant;

    (h) fourth computing means for computing and outputting fourth computed data by multiplying the second computed data output from said second computing means by a fourth constant and adding the result of multiplication to the first computed data output from said first computing means;

    (i) comparing means for comparing a level of the second computed data output from said second computing means with that of fifth computed data obtained by multiplying the first computed data output from said first computing means by a fifth constant and adding a sixth constant to the result of multiplication, and for outputting discrimination data indicative of the kind of computed data which is found to be at a lower level as a result of comparison;

    (j) output switching means for selectively outputting one of the third- computed data output from said third computing means and the fourth computed data output from said fourth computing means according to the discrimination data output from said comparing means;

    (k) transmission mode determining means for determining a transmission mode to be selected for every one of the blocks, according to the discrimination data output from said output switching means, from between a transmission mode in which all the predetermined number of picture element data of which each of the blocks is composed are transmitted and a transmission mode in which not all of the predetermined number of picture element data are transmitted; and

    (l) selective output means for selectively outputting, in accordance with a transmission mode determined by said transmission mode determining means, one of the plurality of picture element data inputted by said input means and the picture element data extracted by said extracting means.

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