EP0630154A2
Expired / Lapsed
EP
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Television receiver capable of enlarging and compressing image
Assignee: Hitachi Ltd
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Filing: 1994-06-16
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Granted: —
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Expires: 2014-06-16
Abstract
Abstract To provide an image which is matched with an aspect ratio of a screen of a display unit by compressing and enlarging the whole of the image to a desired size. A video signal is sequentially written into a field memory in response to a write clock from an input terminal (118). A clock generating circuit (119) supplies the field memory (103) with a read clock having a frequency which is about 4/3 times as high as that of the write clock. A vertical enlargement control circuit (110) reads a video signal from the field memory (103) with a line period corresponding to a magnification factor and inhibits writing to a one-line memory (105) with the same period to provide a line delayed output for an output signal from the field memory (13). A vertical interpolating circuit (106) generates a scanning line signal by an interpolation operation in accordance with a control signal from the vertical enlargement control circuit (110). <IMAGE>
Inventors
- 👤 Kenji Katsumata
- 👤 Shigeru Hirahata
- 👤 Toshinori Murata
- 👤 Haruki Takata
- 👤 Shinobu Torikoshi
- 👤 Takanori Eda
- 👤 Kouichi Ishibashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 17:29
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/01; H04N7/0117; H04N7/0122; H04N3/00; H04N3/10; H04N3/16; H04N3/27
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
252 words
A television receiver capable of enlarging and compressing an image characterized by comprising: memory means (103) having a storage capacity not less than a given value which is controlled with at least a line period; clock generating means (119) for generating a clock having a frequency not less than that of a write clock from the writing clock for writing a video signal in said memory means (103) and for outputting a read clock for reading said written video signal from said memory means (103); vertical enlargement control means (110) for generating and outputting a signal for controlling said memory means (103) to repeatedly read the same line with a line period depending upon a first preset value when said video signal is read from said memory means (103); horizontal enlargement control means (113) for generating and outputting a signal for controlling said memory means (103) to repeatedly read the same pixel form said memory means (103) with a predetermined pixel period depending upon a second preset value when said video signal is read from said memory means; combining means (122) for combining the output signal from said vertical enlargement control means, the output signal from said horizontal enlargement control means and the read clock from said clock generating means and for supplying said memory means with a combined signal; whereby to provide a video signal representing an image which is compressed and enlarged in horizontal and vertical directions to a desired size as an video signal read from said memory means.
Claim 2
Dependent Claim
263 words
A television receiver capable of enlarging and compressing an image according to Claim 1, characterized in that said vertical enlargement control means (110) generates and outputs an interpolation coefficient depending upon said first preset value as well as the signal for controlling said memory means, said horizontal enlargement control means generates and outputs interpolation coefficient depending upon said second preset value as well as the signal for controlling said memory means, said circuit further including at the subsequent stage of said memory means (103), a line memory (104) for delaying said video signal read from said memory means by one line and outputting it, the operation of said line memory being controlled in accordance with the output signal from said vertical enlargement control means; vertical interpolating means (106) for generating and outputting an interpolation signal in accordance with an interpolation coefficient output from said vertical enlargement control means by using said video signal read from said memory means and the output signal from said line memory; delay means (116, 117) for delaying and outputting the signal and the interpolation coefficient output from said horizontal enlargement control means; pixel delaying means (108) for delaying the output signal from said vertical interpolating means and for output it, the operation of said pixel delay means being controlled in accordance with the output signal from said delay means (116); and horizontal interpolating means (109) for generating and outputting an interpolating signal in accordance with the interpolation coefficient output from said delay means (117) by using output signals from said vertical interpolating means and said pixel delay means.
Claim 3
Dependent Claim
293 words
A television receiver capable of enlarging and compressing an image according to Claim 1, characterized in that said vertical enlargement control means (110) generates and outputs an interpolation coefficient depending upon said first preset value as well as the signal for controlling said memory means, said horizontal enlargement control means (113) generates and outputs and interpolation coefficient depending upon said second preset value as well as the signal for controlling said memory means, said circuit further including at the subsequent stage of said memory means, first delay means (116, 117) for delaying and outputting the signal and the interpolation coefficient output from said horizontal enlargement control means pixel delay means (108) for delaying by one pixel said video signal read from said memory means and for outputting it, the operation of said pixel delay means being controlled in accordance with an output signal from said delay means (116); horizontal interpolating means (109) for generating and outputting an interpolating signal in accordance with the interpolation coefficient output from said first delay means (117) by using said video signal read from memory means and the output signal from said pixel delay means; second delay means (501, 502) for delaying and outputting the signal and the interpolation coefficient output from said vertical enlargement control means; a line memory (105) for delaying by one line the output signal from said horizontal interpolating means, the operation of said line memory being controlled in accordance with the output signal from said second delay means (501); and a vertical interpolating means (106) for generating and outputting an interpolation signal in accordance with the interpolation coefficient output from said second delay means (502) by using the output signals from said horizontal interpolating means and the output signal from said line memory.
Claim 4
Dependent Claim
264 words
A television receiver capable of enlarging and compressing an image according to Claim 1, characterized in that said vertical enlargement control means generates and outputs an interpolation coefficient depending upon said first preset value as well as the signal for controlling said memory means, a line memory (105) for delaying said video signal read from said memory means by one line and outputting it, the operation of said line memory being controlled in accordance with the output signal from said vertical enlargement control means; vertical interpolating means (106) for generating and outputting an interpolation signal in accordance with an interpolation coefficient output from said vertical enlargement control means by using said video signal read from said memory means and the output signal from said line memory; delay means (116, 117) for delaying and outputting the signal and the interpolation coefficient output from said horizontal enlargement control means; pixel delaying means (108) for delaying the output signal from said vertical interpolating means and for output it, the operation of said pixel delaying means being controlled in accordance with the output signal from said delay means; second horizontal enlargement control means for generating and outputting a signal for controlling said pixel delay means at intervals of a pixel period corresponding to said second preset value and far generating and outputting an interpolation coefficient corresponding to said second preset value; and horizontal interpolating means (109) for generating and outputting an interpolating signal in accordance with the interpolation coefficient output from said delay means by using output signals from said vertical interpolating means and said pixel delay means.
Claim 5
Dependent Claim
99 words
A television receiver capable of enlarging and compressing an image according to Claim 2, 3 or 4, characterized in that said vertical enlargement control means comprises a first register, adding means for adding said first preset value with the output from said first register to supply the sum to the first register and a second register for storing a carry output from said adding means, whereby the output of said first register is output as said interpolation coefficient and the output of said second register is output as a signal for controlling said memory means and the line memory.
Claim 6
Dependent Claim
77 words
A television receiver capable of enlarging and compressing an image according to Claim 5, characterized in that said vertical enlargement control means includes vertical position generating means for generating the value in accordance with the vertical position and value converting means for consecutively converting the output from said vertical position generating means and for outputting the converted value as said first preset value, whereby to partially change the magnification rate of said image in a vertical direction.
Claim 7
Dependent Claim
100 words
A television receiver capable of enlarging and compressing an image according to Claim 2, 3 or 4, characterized in that said horizontal enlargement control means comprises a first register, adding means for adding said second preset value with the output from said first register to supply the sum to said first register and a second register for storing a carry output from said adding means, whereby the output of said first register is output as said interpolation coefficient and the output of said second register is output as a signal for controlling said memory means and the pixel delay means.
Claim 8
Dependent Claim
78 words
A television receiver capable of enlarging and compressing an image according to Claim 7, characterized in that said horizontal enlargement control means includes horizontal position generating means for generating the value in accordance with the horizontal position and value converting means for consecutively converting the count output from said horizontal position generating means and for outputting the converted value as said second preset value, whereby to partially change the magnification rate of said image in a horizontal direction.
Claim 9
Dependent Claim
100 words
A television receiver capable of enlarging and compressing an image displayed on a screen of a display means, characterized by comprising: deflecting means for generating a deflection current for driving said display means; and correcting means for correcting said deflection current generated by said deflecting means, which is capable of changing the amount of the correction of said deflection current, whereby to change a rate of compression/enlargement of the image displayed on the screen of said display means for each area of the screen by changing the amount of correction in said correcting means in accordance with a preset value.
Claim 10
Dependent Claim
71 words
A television receiver capable of enlarging and compressing an image according to Claim 9, characterized in that said deflecting means is capable of changing the amount of the generated said deflection current and is capable of changing the compression/magnification factor of the whole of an image to be displayed on the screen of said display means by changing the amount of current in said correcting means depending upon the preset value.
Claim 11
Dependent Claim
43 words
A television receiver capable of enlarging and compressing an image according to Claim 9, characterized in that said correcting means is capable of changing only the amount of correction of a vertical deflection current for the amount of correction of said deflection current.
Claim 12
Dependent Claim
41 words
A television receiver capable of enlarging and compressing an image according to Claim 10, characterized in that said deflecting means is capable of changing only the amount of a vertical deflection current for the amount of correction of said deflection current.
Claim 13
Dependent Claim
44 words
A television receiver capable of enlarging and compressing an image according to Claim 9, 10, 11 or 12, characterized in that said preset value is determined depending upon an aspect ratio of an image represented by a video signal input by said display means.
References Cited (Backward Citations)
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