Television – Format conversion – Conversion between standards with different aspect ratios
Reexamination Certificate
1998-09-22
2001-02-20
Kostak, Victor R. (Department: 2711)
Television
Format conversion
Conversion between standards with different aspect ratios
C348S581000, C348S704000
Reexamination Certificate
active
06191820
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a device and a method for converting an aspect ratio of a video signal, and more particularly, to a device and a method for converting an aspect ratio of a video signal in which an aspect ratio of an image at an arbitrary position can be converted to an arbitrary value.
2. Discussion of the Background Art
As a society is more and more information oriented, images become more and more abundant such that even general people have frequent contact with the images, and as forms of the images become to have variety, cases when the images are edited even in homes or offices are increasing more and more. Most of the editions of images up to now are done on personal computers. In most of the cases, the image edition is based on a method in which image data are read from a video RAM, make modification of the data and using the data again.
A television receiver is not a device on which edition of images can be made as it has been designed to display images as they were. Since the television receiver has in general a fixed aspect ratio of 4:3 or 16:9, when it is desired to convert the aspect ratio of the image, the conversion up to now is limited to changing of an overall aspect ratio. This is merely a processing of images for the convenience of watch rather than an image edition.
FIG. 1
illustrates a system block diagram of a general analog type deflective wave generator.
Referring to
FIG. 1
, the general analog type deflective wave generator is provided with horizontal and vertical sawtooth wave generating circuits
11
and
21
for generating horizontal and vertical sawtooth waves synchronous to horizontal and vertical synchronizing signals Hsync/Vsync respectively, horizontal and vertical S-form modifying circuits
12
and
22
for modifying starting and end portions of the sawtooth waves from the horizontal and vertical sawtooth wave generating circuits
11
and
21
to S-forms respectively, and current amplifiers
13
and
23
for amplifying signals from the horizontal and vertical S-form modifying circuits
12
and
22
to a prescribed levels and providing to a CRT, respectively. The horizontal and vertical sawtooth waves are set to be scanned in one direction, for example, from left to right, or from top from down, at fixed intervals.
And, a technique in which a deflection slope or a read/write clock speed of a display is controlled for changing the aspect ratio is suggested in U.S. Pat. No. 5,537,149. However, this technique can only convert an overall aspect ratio, linearly as a display ratio for an entire screen is fixed in vertical or horizontal direction of the screen. An image may be horizontally converted at a fixed ratio for all vertical directions by the horizontal S-form modification or may be vertically converted at a fixed ratio for all horizontal directions by the vertical S-form modification.
And, a technique is suggested, in which images are stored in a line memory and a field memory and subjected to compression or expansion interpolation between adjacent two pixels ro two lines, for changing the aspect ratio. However, in this technique, a ratio of the data interpolation is fixed for the entire screen in a horizontal or vertical direction, only allowing a fixed ratio conversion for the entire screen.
In the aforementioned techniques, since the scanning in general display is made in one direction(in general from left to right and from top to bottom) at fixed intervals, horizontal scanning lines and vertical scanning lines cross at right angles. That is, as shown in
FIG. 2
a
, a regular frame of an image before conversion of an aspect ratio(an image display ratio is 1) shows a fixed ratio between scamming times and scanning distances expressed in the following equation (1) both in horizontal and vertical directions at any point 1(x1, y1) on the screen.
t
X11
:t
x12
=d
x11
d
12
and
t
y11
:t
y12
=d
y11
:d
y12
(
1)
However, there is no techniques suggested presently yet, in which an aspect ratio of only a portion of a frame is converted for an improved image better than original image or to serve for a particular purpose intentionally. If conversion of an aspect ratio for a particular portion of an entire frame is possible, an improved image can be provided by high lighting characterized part of the image, and this technique will find wide application to various fields in image display.
SUMMARY OF THE INVENTION
Accordingly, the present invention is directed to a device and a method for converting an aspect ratio of a video signal that substantially obviates one or more of the problems due to limitations and disadvantages of the related art.
An object of the present invention is to provide a device and a method for converting an aspect ratio of a video signal, in which any video signal can be displayed in an aspect ratio the most suitable to a given screen regardless of an aspect ratio.
Another object of the present invention is to provide a device and a method for converting an aspect ratio of a video signal, in which an aspect ratio of only a portion of a frame can be converted arbitrarily for displaying a desired form of image.
Other object of the present invention is to provide a device and a method for converting an aspect ratio of a video signal, in which a deflective wave can be generated for varying an aspect ratio of any portion of a frame as desired.
Further object of the present invention is to provide a device and a method for converting an aspect ratio of a video signal, in which a clock for a portion of a video signal is made different for changing an aspect ratio of the image at a particular portion.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described, the device for converting an aspect ratio of a video signal, the device displaying a received image on a screen divided into a plurality of horizontal, and vertical sections, includes means for generating arbitrary mapping information on the received image in image block units defined by the horizontal, and vertical sections, and means for determining the aspect ratio of the received image for a block using the arbitrary mapping information and converting the received image, varying a vertical display ratio for each horizontal position and/or a horizontal display ratio for each vertical position, of the received image with the aspect ratio.
In other object of the present invention, there is provided a device for converting an aspect ratio of a video signal, the device displaying a received image on a screen divided into a plurality of horizontal sections and vertical sections, including means for generating interpolation ratio conversion extent information on the received image in image block units defined by the horizontal, and vertical sections, and means for making different conversion of an interpolation ratio for a block for each horizontal, and/or vertical positions using the interpolation ratio conversion extent information.
In other object of the present invention, there is provided a device for converting an aspect ratio of a video signal, the device displays a received image on a screen divided into a plurality of horizontal sections and vertical sections, including means for generating deflective ratio conversion extent information on the received image in image block units defined by the horizontal, and vertical sections, and means for making different conversion of a deflective ratio for a block for each horizontal, and/or vertical positions using the deflective ratio conversion extent information.
In
Kang Kyung Jin
Paik Woo Hyun
Fleshner & Kim LLP
Kostak Victor R.
LG Electronics Inc.
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