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Apparatus and method for converting a compressed video stream with preview of converted stream

a technology of compressed video and apparatus, applied in the direction of signal generators with optical-mechanical scanning, color televisions with bandwidth reduction, signal systems, etc., can solve the problems of difficult setting work, insufficient consideration of ease of use, and difficulty in detail setting of short stream portions

Inactive Publication Date: 2008-08-28
KOMI HIRONORI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This configuration enhances user interaction for setting desired image quality by allowing real-time parameter adjustments and quick feedback, improving ease of use and maintaining image quality, especially for short video streams like motion picture mail, while optimizing frame rate and bit rate allocation.

Problems solved by technology

Therefore, it is hard to set the image quality of a short stream portion in detail.
For example, when the image quality of a relatively short stream such as moving image mail is to be determined, reproduction of the relevant portion ends so soon that it is difficult to conduct the setting work.
But, the JP-A-2001-36844 has not fully considered such ease of use.

Method used

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  • Apparatus and method for converting a compressed video stream with preview of converted stream
  • Apparatus and method for converting a compressed video stream with preview of converted stream
  • Apparatus and method for converting a compressed video stream with preview of converted stream

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Embodiment Construction

[0025]FIG. 1 is a block diagram showing the first embodiment of a video recording / reproducing device containing a video transcoder for converting an encoding system of video stream according to the present invention. This device records an imaging signal as an MPEG2 video stream in a storage medium, reproduces it to convert into an MPEG4 video stream and outputs to the outside. When a user wants to record on a medium 100, a recording command is output from a user IF 109, and a system controller 110 having received the recording command controls a lens section 400 and a digital signal processor (DSP) 401 to convert the imaged analog signal into a digital video signal. Besides, the digital video signal is encoded by an MPEG2 encoder 402 to generate an MPEG2 video stream. The MPEG2 video stream is recorded in the storage medium 100 together with unshown audio information or video stream control data through a medium IF (record reproduction circuit) 101.

[0026]When the reproduction is in...

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PUM

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Abstract

An apparatus by which a user can easily set a parameter for conversion when a compression encoding system of video stream is converted is provided. A particular period in a first video stream is repeatedly reproduced to convert the reproduced portion into a second video stream in real time. At that time, the user checks the image quality after conversion on a preview screen and sets a desired conversion parameter. A local decode image is output to the preview screen. Thus, the circuit configuration is simplified.

Description

RELATED APPLICATIONS[0001]This is a continuation application of U.S. patent application Ser. No. 10 / 441,012, filed on May 20, 2003, now allowed, the contents of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to an apparatus for converting an encoding system of video stream or video transcoder, a method therefor, and a video recording / reproducing device using the above apparatus.[0004]2. Description of the Related Art[0005]Technologies for digitizing image information and compression encoding by an MPEG video compression technology to store on a storage medium or to transmit through a communication medium have been used for various types of equipment. Such examples are a DVD recording / reproducing device using an MPEG-2 Video (ISO / IEC13818-2) system, communications between portable terminals using an MPEG-4 Video (ISO / IEC14496-2) system, and the like. Because the compression systems are different...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04B1/66H04N19/00H04N5/92H04N19/102H04N19/115H04N19/136H04N19/162H04N19/172H04N19/179H04N19/40H04N19/50H04N19/503H04N19/587H04N19/59
CPCH04N19/169H04N19/132H04N19/154H04N19/40H04N19/192H04N19/587H04N19/162
Inventor KOMI, HIRONORIYATABE, YUSUKETAKAHASHI, MASARU
Owner KOMI HIRONORI