Television – Format conversion – Changing number of lines for standard conversion
Patent
1997-01-07
1998-12-29
Kostak, Victor R.
Television
Format conversion
Changing number of lines for standard conversion
348448, H04N 701
Patent
active
058546596
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is directed to a process for processing a first video picture with image points in m.sub.1 lines, whose image points in the l.sub.1 -th line have an intensity I.sub.1 (t, l.sub.1) depending on a parameter t, in particular depending on time, for generating a second video picture with m.sub.2 lines. The invention is further directed to an apparatus for processing a first video picture with image points in m.sub.1 lines, whose image points in the l.sub.1 -th line have an intensity I.sub.1 (t, l.sub.1) depending on a parameter t, in particular depending on time, for generating the image points of a second video picture with m.sub.2 lines.
2. Description of the Related Art
Different video standards with respect to the number of lines and the number of image points per line require conversion, e.g., a transmitted PAL image for showing in a HDTV receiver. The simplest solution is to down-scale the PAL images on the HDTV screen. However, this is unsatisfactory since the customer tolerates the greater expenditure and accordingly the higher cost for HDTV because of the large picture which can be achieved, among other reasons.
In order to make full use of the screen size, it would also be possible to read the PAL image into an image storage which is then read out in accordance with the resolution of the HDTV standard. However, in so doing, the poorer resolution of the PAL image becomes noticeable, particularly on very large HDTV screens, in that individual image points are further resolved by the eye of the viewer. This is disturbing. Improved image quality for PAL images shown in a HDTV receiver is desirable.
The aforementioned conversion of PAL into HDTV was only mentioned as an example. The same problems occur whenever the number of image points or the number of lines of the reproduced image is greater than that of the received image.
A number of proposed solutions for increasing resolution are found in the literature.
According to the teaching in DE 38 41 037 A1, the color transform of a color signal is used to transmit additional information for a 16-to-9 image. Reception is also possible with a conventional receiver so that investment is required on the part of the consumer only if reception of the improved image quality is desired.
Similarly, DE 38 19 253 C1 describes the transmission of additional information, in this case on a high-frequency carrier in sidebands. In DE 33 44 524, the luminance signal is provided with additional information.
U.S. Pat. No. 4,607,773 teaches a process in which different numbers of frames and lines are transmitted depending on the image content, in particular depending on the degree of motion. This process requires a suitable processor for decoding. Further, the process can only be carried out when the transmitter is provided with a motion sensor, filter devices for band limiting, a high-resolution camera, and additional modulation devices.
DE 34 01 809 A1 and DE 34 35 265 are directed to signal processing in high-resolution television cameras for transmission within conventional band limits.
All of these suggestions require processing of the signals on the transmission end. For this purpose, high investments are required on the transmission end as well as on the reception end. Since systems of this kind can also only be introduced in practice by appropriate standardization, such solutions will probably only be realized in the remote future.
It would be desirable to obtain a higher-resolution image from signals which are already currently available for video pictures. In this case, a higher-quality image could be generated and shown or recorded simply by means of an appropriate added device for a television receiver or another video system such as a video recorder.
OBJECT AND SUMMARY OF THE INVENTION
The primary object of the present invention is to find a process and to provide a corresponding apparatus enabling an increased image resolution with higher image quality for video pictures, wherein the apparatu
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"Signal Processing of HDTV"L'Aquila, Italy Feb. 29--Mar. 2, 1988 (XP 00075084 / pp. 471-485).
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Excerpt from DTV-Lexikon de Physik (p. 41).
"Signal Processing Of HDTV, II" Turin, Italy Aug. 30 --Sep. 1, 1989 (pp. 665-673).
Catalogue :Seleco 626 to 1250 Upconverter For HDFP Projector Description (3 pgs).
Deter Christhard
Hubrich Dieter
Kotowski Olaf
Loeffer Dirk
Kostak Victor R.
LDT Gmb&H Co. Laser-Display-Technologie KG
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