Invention Grant
- Patent Title: Video recording apparatus
- Patent Title (中): 录像设备
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Application No.: US12991702Application Date: 2009-04-30
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Publication No.: US08837918B2Publication Date: 2014-09-16
- Inventor: Tomoo Nishigaki
- Applicant: Tomoo Nishigaki
- Applicant Address: JP Osaka
- Assignee: Sharp Kabushiki Kaisha
- Current Assignee: Sharp Kabushiki Kaisha
- Current Assignee Address: JP Osaka
- Agency: Birch, Stewart, Kolasch & Birch, LLP
- Priority: JP2008-129555 20080516
- International Application: PCT/JP2009/058444 WO 20090430
- International Announcement: WO2009/139303 WO 20091119
- Main IPC: H04N5/917
- IPC: H04N5/917 ; H04N5/85 ; G11B20/00 ; H04N19/115 ; H04N19/156 ; H04N19/152 ; H04N19/124 ; H04N19/154 ; H04N19/192 ; H04N5/76 ; H04N19/40 ; G11B20/10 ; H04N9/804 ; H04N5/91 ; H04N9/79 ; H04N5/781

Abstract:
A video recording apparatus compresses video data so that a bit rate converges to a target bit rate while keeping a minimum image quality and records the compressed video data. The video recording apparatus (exemplified by a recording and reproducing apparatus (10)) comprises a compressing portion (exemplified by a transcoder (13)) which compresses the video data while executing a rate control including a change of a quantization step so that a bit rate in a predetermined period converges to a target bit rate; a recording portion which records the compressed data in a recording medium; and a total rate calculation portion that calculates a total bit rate of a result of compression of the video data by the compressing portion from the start of the compression to the present time. The compressing portion comprises a quantization step limiting portion which limits the changed quantization step to a predetermined upper limit lower than an upper limit changeable in the compressing portion, and a quantization step fixing portion which fixes the quantization step to the predetermined upper limit when the calculated total bit rate exceeds the target bit rate.
Public/Granted literature
- US20110058794A1 VIDEO RECORDING APPARATUS Public/Granted day:2011-03-10
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