WO2000002384A2 - Image data compression - Google Patents

Image data compression Download PDF

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Publication number
WO2000002384A2
WO2000002384A2 PCT/IB1999/001149 IB9901149W WO0002384A2 WO 2000002384 A2 WO2000002384 A2 WO 2000002384A2 IB 9901149 W IB9901149 W IB 9901149W WO 0002384 A2 WO0002384 A2 WO 0002384A2
Authority
WO
WIPO (PCT)
Prior art keywords
yin
yout
uin
signal
vin
Prior art date
Application number
PCT/IB1999/001149
Other languages
French (fr)
Other versions
WO2000002384A3 (en
Inventor
Erik De Meersman
Original Assignee
Koninklijke Philips Electronics N.V.
Philips Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics N.V., Philips Ab filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2000002384A2 publication Critical patent/WO2000002384A2/en
Publication of WO2000002384A3 publication Critical patent/WO2000002384A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/445—Receiver circuitry for the reception of television signals according to analogue transmission standards for displaying additional information
    • H04N5/45—Picture in picture, e.g. displaying simultaneously another television channel in a region of the screen
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
    • H04N7/0117—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level involving conversion of the spatial resolution of the incoming video signal
    • H04N7/0122—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level involving conversion of the spatial resolution of the incoming video signal the input and the output signals having different aspect ratios

Definitions

  • the invention relates to an image data compression such as used for Picture-In- Picrure (PIP) or double-window TV.
  • PIP Picture-In- Picrure
  • TV double-window TV
  • a first aspect of the invention provides a method and a device as defined by claims 1 and 2.
  • a second aspect of the invention provides an image display apparatus device as defined by claim 3.
  • digitized luminance and chrominance signal samples in a ratio yin:uin:vin are subsampled to obtain subsampled luminance and chrominance signal samples in a ratio yout:uout:vout, wherein yimyout exceeds uin:uout and/or yi yout exceeds vin:vout.
  • the drawing shows an embodiment of an image display apparatus in accordance with the present invention.
  • the embodiment shown in the drawing comprises an image data compression device, comprising inputs 2a, 2b, 2c for receiving digitized luminance signal samples Yin and chrominance signal samples Uin, Vin in a ratio yin:uin:vin.
  • yin:uin:vin 4:2:2.
  • the embodiment further comprises an image data compression device IDC for subsampling the digitized luminance Yin and chrominance Uin, Vin signal samples to obtain subsampled luminance signal samples Yout and chrominance signal samples Uout, Vout in a ratio yout:uout:vout.
  • a 4:1:1 sampled signal becomes a 4:2:2
  • the embodiment further comprises a device P for processing a first signal SI applied to an input 1 to obtain a processed first signal PS 1.
  • the device P would be formed by the main signal channel, while in a double window application, the device P would be similar to the image data compression device IDC.
  • the first signal SI may be a composite video signal, or a set of luminance and chrominance signals just as present at the inputs 2a, 2b and 2c.
  • a combination device C combines the processed first signal PS1 and the compressed signals Yout, Uout, Vout to obtain a display signal DS.
  • a display device D displays the display signal DS.

Abstract

In an image data compression method, digitized luminance (Yin) and chrominance (Uin, Vin) signal samples in a ratio yin:uin:vin are subsampled (IDC) to obtain subsampled luminance (Yout) and chrominance (Uout, Vout) signal samples in a ratio yout:uout:vout, wherein yin:yout exceeds uin:uout and/or yin:yout exceeds vin:vout.

Description

Image data compression.
The invention relates to an image data compression such as used for Picture-In- Picrure (PIP) or double-window TV.
Luminance (Y) and chrominance (U, V) are commonly sampled (digitized) in a ratio Y:U:V = 4: 1 : 1. In NTSC countries, where the signals I and Q are used instead of U and V, this would be Y:I:Q = 4:1:1. In PIP or double window applications, this ratio is commonly preserved at the downsampling operation to obtain the smaller image.
It is, inter alia, an object of the invention to obtain a better color resolution after subsampling. To this end, a first aspect of the invention provides a method and a device as defined by claims 1 and 2. A second aspect of the invention provides an image display apparatus device as defined by claim 3.
In an image data compression method in accordance with a primary aspect of this invention, digitized luminance and chrominance signal samples in a ratio yin:uin:vin are subsampled to obtain subsampled luminance and chrominance signal samples in a ratio yout:uout:vout, wherein yimyout exceeds uin:uout and/or yi yout exceeds vin:vout.
These and other aspects of the invention will be apparent from and elucidated with reference to the embodiments described hereinafter.
The drawing shows an embodiment of an image display apparatus in accordance with the present invention.
The embodiment shown in the drawing comprises an image data compression device, comprising inputs 2a, 2b, 2c for receiving digitized luminance signal samples Yin and chrominance signal samples Uin, Vin in a ratio yin:uin:vin. As mentioned above, a common ratio would be yin:uin:vin = 4: 1 : 1. Alternatively, yin:uin:vin = 4:2:2. The embodiment further comprises an image data compression device IDC for subsampling the digitized luminance Yin and chrominance Uin, Vin signal samples to obtain subsampled luminance signal samples Yout and chrominance signal samples Uout, Vout in a ratio yout:uout:vout. In accordance with the present invention, yin:yout exceeds uin:uout and/or yin:yout exceeds vin:vout. So, where in the prior art a 4: 1 : 1 sampled signal would stay a 4: 1 : 1 (=1 : — : — ) sampled signal upon
4 4 subsampling, in accordance with the present invention, a 4:1:1 sampled signal becomes a 4:2:2
(=1 : — : — ) or even a 4:4:4 (=1 : 1 : 1 ) sampled signal. Thereby, the color resolution is enhanced
with regard to the luminance resolution just by throwing away less chrominance samples that what would be proportionate to the reduction in luminance samples. In one example, no chrominance samples whatsoever are thrown away.
The embodiment further comprises a device P for processing a first signal SI applied to an input 1 to obtain a processed first signal PS 1. In a PIP application, the device P would be formed by the main signal channel, while in a double window application, the device P would be similar to the image data compression device IDC. The first signal SI may be a composite video signal, or a set of luminance and chrominance signals just as present at the inputs 2a, 2b and 2c. A combination device C combines the processed first signal PS1 and the compressed signals Yout, Uout, Vout to obtain a display signal DS. A display device D displays the display signal DS.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. Especially, where the embodiments mention U and V signals, I and Q signals may be used in an NTSC environment. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of other elements or steps than those listed in a claim. The invention can be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the device claim enumerating several means, several of these means can be embodied by one and the same item of hardware.

Claims

CLAIMS:
1. An image data compression method, comprising: receiving (2a, 2b, 2c) digitized luminance (Yin) and chrominance (Uin, Vin) signal samples in a ratio yin:uin:vin; and subsampling (IDC) said digitized luminance (Yin) and chrominance (Uin, Vin) signal samples to obtain subsampled luminance (Yout) and chrominance (Uout, Vout) signal samples in a ratio yout:uout:vout, wherein yin:yout exceeds uin:uout and/or yin:yout exceeds vi vout.
2. An image data compression device, comprising: means for receiving (2a, 2b, 2c) digitized luminance (Yin) and chrominance
(Uin, Vin) signal samples in a ratio yin:uin:vin; and means for subsampling (IDC) said digitized luminance (Yin) and chrominance (Uin, Vin) signal samples to obtain subsampled luminance (Yout) and chrominance (Uout, Vout) signal samples in a ratio yout:uout:vout, wherein yin:yout exceeds uin:uout and/or yi yout exceeds vin:vout.
3. An image display apparatus, comprising: means for processing (P) a first signal (SI) to obtain a processed first signal (PSD; an image data compression device (IDC) as claimed in claim 2 for compressing a second signal including digitized luminance (Yin) and chrominance (Uin, Vin) signal samples to obtain a compressed second signal including subsampled luminance (Yout) and chrominance (Uout, Vout) signal samples; means for combining (C) said processed first signal (PS1) and said compressed second signal (Yout, Uout, Vout) to obtain a display signal (DS); and means for displaying (D) said display signal (DS).
PCT/IB1999/001149 1998-07-06 1999-06-21 Image data compression WO2000002384A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP98202260.0 1998-07-06
EP98202260 1998-07-06

Publications (2)

Publication Number Publication Date
WO2000002384A2 true WO2000002384A2 (en) 2000-01-13
WO2000002384A3 WO2000002384A3 (en) 2000-04-13

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB1999/001149 WO2000002384A2 (en) 1998-07-06 1999-06-21 Image data compression

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004110072A1 (en) * 2003-06-06 2004-12-16 Mediatek Inc. Apparatus and method for format converting and mixing video signal
US7949054B2 (en) 2006-06-01 2011-05-24 Microsoft Corporation Flexible data organization for images
US9106936B2 (en) 2012-01-25 2015-08-11 Altera Corporation Raw format image data processing

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4712130A (en) * 1986-08-29 1987-12-08 Rca Corporation Chrominance signal frequency converter as for a pix-in-pix television receiver
EP0371270A2 (en) * 1988-10-31 1990-06-06 Nec Corporation Image size reduction circuit for reducing ordinary-sized image into smaller area
EP0773684A2 (en) * 1995-11-09 1997-05-14 Sony United Kingdom Limited Video down-conversion

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07284117A (en) * 1994-04-12 1995-10-27 Fujitsu General Ltd Television receiver

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4712130A (en) * 1986-08-29 1987-12-08 Rca Corporation Chrominance signal frequency converter as for a pix-in-pix television receiver
EP0371270A2 (en) * 1988-10-31 1990-06-06 Nec Corporation Image size reduction circuit for reducing ordinary-sized image into smaller area
EP0773684A2 (en) * 1995-11-09 1997-05-14 Sony United Kingdom Limited Video down-conversion

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN & JP 07 284 117 A (FUJITSU GENERAL LTD) 27 October 1995 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004110072A1 (en) * 2003-06-06 2004-12-16 Mediatek Inc. Apparatus and method for format converting and mixing video signal
US7949054B2 (en) 2006-06-01 2011-05-24 Microsoft Corporation Flexible data organization for images
US8385428B2 (en) 2006-06-01 2013-02-26 Microsoft Corporation Flexible data organization for images
US10075711B2 (en) 2006-06-01 2018-09-11 Microsoft Technology Licensing, Llc Flexible data organization for images
US9106936B2 (en) 2012-01-25 2015-08-11 Altera Corporation Raw format image data processing

Also Published As

Publication number Publication date
WO2000002384A3 (en) 2000-04-13

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