Image signal restoring apparatus

• US 5,150,210 A
• Filed: 12/03/1991
• Issued: 09/22/1992
• Est. Priority Date: 12/26/1988
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Ishii, Yoshiki, Hoshi, Hidenori, Fukuzawa, Keiichi
• Primary Examiner(s): Peng, John K.
• Application Number:
  US07/801,625
• Time in Patent Office: 294 Days
• Field of Search: 358/105, 358/133, 358/135, 358/136
• US Class Current: 375/240.14
• CPC Class Codes: H04N 19/895 in combination with error concealment
• CPC Class Codes: H04N 19/98 Adaptive-dynamic-range coding [ADRC]

Abstract

An apparatus for restoring an original image signal from a transmitted image information signal formed by dividing one picture amount of image signal composed of a plurality of picture element signals into a plurality of blocks each composed of a plurality of picture element signals and high-efficiently coding, for every block, the plurality of picture element signals constituting a respective one of the plurality of divided blocks is arranged to judge whether the picture element signals in each block are restorable or not on the basis of the inputted image information signal, to detect the presence or absence of motion in an image represented by the picture element signals of a block in which the picture element signals have been judged not to be unrestorable, to select either the picture element signals of a block belonging to the same picture as the unrestorable picture element signal block or the picture element signals of a block belonging to another picture according to a result of detection, and to output the selected picture element signals as interpolation picture element signals. The arrangement enables the apparatus to carry out an interpolation process in a manner most opposite to the state of the image to be reproduced.

Claims

1. An image signal restoring apparatus for restoring an original image signal from a transmitted image information signal, comprising:

a) judgment means, to which an image information signal formed by dividing one picture amount of image signal composed of a plurality of picture element signals into a plurality of blocks each composed of a plurality of picture element signals and by block coding, for every block, the plurality of picture element signals constituting a respective one of the plurality of blocks is inputted for every block, for judging whether the picture element signals in each block are restorable or not on the basis of the inputted image information signal;

b) motion detecting means for detecting presence or absence of motion in an image represented by the picture element signals of a block in which the picture element signals have been judged to be restorable by said judgment means; and

c) interpolation means for selecting either the picture element signals of a block belonging to the same picture as that of the block in which the picture element signals have been judged to be not restorable by said judgment means or the picture element signals of a block belonging to a picture different from that of the block in which the picture element signals have been judged to be not restorable, according to a result of detection made by said motion detecting means, and for outputting the selected picture element signals as interpolation picture element signals.

2. An apparatus according to claim 1, wherein said motion detecting means includes:

a) picture element signal storing means for storing picture element signals already restored;

b) motion detecting information signal generating means arranged to compare newly restored picture element signals with the picture element signals stored by said picture element signal storing means and to generate, according to a result of comparison, a motion detecting information signal indicative of the presence or absence of motion in an image represented by the picture element signals; and

c) motion detecting information signal outputting means arranged to temporarily store motion detecting information signals generated by said motion detecting information signal generating means and, for a block in which the picture element signals have been judged to be not restorable by said judgment means, to form and output another motion detecting information signal by using the motion detecting information signal which is for a block in which the picture element signals have been judged to be restorable among the stored motion detecting information signals.

3. An image signal restoring apparatus for restoring an original image signal from a transmitted image information signal, comprising:

a) judgment means, to which an image information signal formed by dividing one picture amount of image signal composed of a plurality of picture element signals into a plurality of blocks each composed of a plurality of picture element signals and by block coding, for every block, the plurality of picture element signals constituting a respective one of the plurality of blocks is inputted for every block, for judging whether the picture element signals in each block are restorable or not on the basis of the inputted image information signal;

b) motion detecting means detecting presence or absence of motion in an image represented by the picture element signals of a block in which the picture element signals have been judged to be restorable by said judgment means; and

c) detection result storing means for storing a result of detection made by said motion detecting means; and

d) interpolation means for selecting either the picture element signals of a block belonging to the same picture as that of the block in which the picture element signals have been judged to be not restorable by said judgment means or the picture element signals of a block belonging to a picture different from that of the block in which the picture element signals have been judged to be not restorable, according to a result of detection stored by said detection result storing means, and for outputting the selected picture element signals as interpolation picture element signals.

4. An apparatus according to claim 3, wherein said motion detecting means includes:

a) picture element signal storing means for storing picture element signals already restored; and

b) motion detecting information signal generating means arranged to compare newly restored picture element signals with the picture element signals stored by said picture element signal storing means and to generate, according to a result of comparison, a motion detection information signal indicative of the presence or absence of motion in an image represented by the picture element signals.

5. An apparatus according to claim 4, wherein said detection result storing means includes:

a) first storing means for storing a motion detecting information signal for each of blocks of the picture element signals already restored;

b) second storing means for storing a motion detecting information signal for each of blocks of the newly restored picture element signals; and

c) motion detecting information signal outputting means for outputting a motion detecting information signal which, among motion detecting information signals stored by said first storing means, corresponds to a block in which the picture element signals have been judged to be not restorable by said judgment means.

6. An image signal restoring apparatus for restoring an original image signal from a transmitted image information signal, comprising:

(a) judgment means to which an image information signal formed by dividing one picture amount of image signal composed of a plurality of picture element signals into a plurality of blocks each composed of a plurality of picture element signals and by block coding, for every block, the plurality of picture element signals constituting a respective one of the plurality of blocks is inputted for every block, for judging whether original picture element signals are restorable or not on the basis of the inputted image information signal in each block; and

(b) interpolation means for interpolating the picture element signals of a block in which the original picture element signals have been judged to be not restorable by said judgment means, with picture element signals of another block.

7. An apparatus according to claim 6, wherein said interpolation means is arranged to select, as the picture element signals in which the original picture element signals of a block which have been judged to be not restorable by said judgment means, either the picture element signals of another block corresponding to the same picture as that of said not restorable block or the picture elements signals of another block corresponding to a picture which is different from said not restorable block and to output the selected picture element signals as interpolation picture element signals.

8. An apparatus according to claim 6, further comprising:

motion detecting means for detecting presence or absence of a motion in an image corresponding to the block in which the original picture element signals have been judged to be not restorable;

in which said interpolation means is arranged to select, as the picture element signals in which the original picture element signals of a block which have been judged to be not restorable by said judgment means, either picture element signals of another block corresponding to the same picture as that of said not restorable block or the picture element signals of another block corresponding to a picture which is different from said not restorable block, in accordance with a result of detection made by said motion detecting means, and to output the selected picture element, as interpolation picture element signals.