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Method and apparatus for scaling up and down a video image

a video image and scaling technology, applied in the field of methods and apparatus for scaling up and down video images, can solve the problem of not being able to make the resolution of a video signal generated by the computer coinciden

Inactive Publication Date: 2011-08-30
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

When the relations between the resolutions of a video signal and frequencies of synchronizing signals are stored in the resolution storage means, the resolution can be readily determined according to the frequencies of the synchronizing signals.

Problems solved by technology

When the display device has a significantly large screen size, it may be impossible to make the resolution of a video signal generated by the computer coincident with the resolution of the display device.
The similar problem arises when a video image generated by a device other than the computer (for example, a television image) is displayed on a display device other than a television receiver.

Method used

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  • Method and apparatus for scaling up and down a video image
  • Method and apparatus for scaling up and down a video image
  • Method and apparatus for scaling up and down a video image

Examples

Experimental program
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first embodiment

FIG. 1 is a block diagram illustrating the structure of a liquid-crystal projector as a first embodiment according to the present invention. The liquid-crystal projector projects video images generated by a personal computer 100 on a large-size screen (not shown). The liquid-crystal projector includes a CPU 20, a main memory 22, an input panel 24 functioning as input means, an A-D converter 32, a frame memory 34, a video scaler 36, LCD drivers 38, LCD panels (liquid-crystal panels) 40, and a light source 42. The frame memory 34 includes three memory planes for storing R, G, and B signals, respectively. The LCD drivers 38 and the LCD panels are also provided for the R, G, and B signals.

The CPU 20 functions as a frequency determination unit 26 for determining a frequency of a synchronizing signal SYNC given by the personal computer 100 and as a resolution determination unit 28 for determining a resolution corresponding to the frequency of the synchronizing signal SYNC. The CPU 20 exec...

second embodiment

FIG. 11 is a block diagram illustrating the structure of a down-converter as a second embodiment according to the present invention. The down-converter has a video signal selection unit 200 in addition to the input unit of the liquid-crystal projector shown in FIG. 1. The down-converter further includes a video encoder 202 in place of the LCD driver 38, and a variety of output devices (such as a television receiver 204, a video player 206, and a CD-RAM 208) in place of the LCD panel 40 and the light source 42.

The video signal selection unit 200 receives two television signals STV1 and STV2 as well as video signals (VPC, SYNC) generated by a personal computer, and selects one of the received signals. The television signals STV1 and STV2 are composite video signals including synchronizing signals. When the video signal selection unit 200 selects a composite video signal, a decoder (not shown) in the video signal selection unit 200 generates component video signals VIN and a synchroniz...

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Abstract

An input video image having an arbitrary resolution is converted to another video image having a predetermined resolution of a display device to display the video image with the converted resolution. The frequencies of the synchronizing signals of the input video signal are measured, and then a resolution of an input video signal is determined from the measured frequencies of the synchronizing signals. The video image represented by the input video signal is expanded or contracted, so as to make the resolution of the input video signal coincident with a resolution of the display device. A resulting video image with the converted resolution is displayed on the display device.

Description

BACKGROUND OF THE INVENTION1. Field of the InventionThe present invention relates to a method of and an apparatus for scaling up and down an input video image and displaying the resultant video image on a display device.2. Description of the Related ArtIn some cases, it is required to display video images generated by a computer on another display device, such as a liquid-crystal projector. In such a case, the computer should generate video signals according to the resolution of the display device. In the description of this specification, the term “resolution” implies both a number of dots (that is, a number of pixels) in a horizontal direction of a video image and a number of lines (that is, a number of scanning lines) in a vertical direction. The number of dots in the horizontal direction is referred to as the horizontal resolution, whereas the number of lines in the vertical direction is referred to as the vertical resolution.The resolution and the number of tones of a video ima...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G06T17/00G09G3/20H04N3/223G09G5/00G09G5/12G09G5/36G09G5/391
CPCG09G5/005G09G5/006G09G5/391G09G2340/0407G09G2360/02
Inventor KESATOSHI, TAKEUCHI
Owner SEIKO EPSON CORP
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