Video Recording Apparatus, Video Recording System and Video Recording Method

• US 20130028570A1
• Filed: 07/26/2012
• Published: 01/31/2013
• Est. Priority Date: 07/27/2011
• Status: Active Grant

• Current Assignee: Hitachi Industry & Control Solutions, Ltd. (Hitachi, Ltd.)
• Original Assignee: Hitachi, Ltd.
• Inventors: SUEMATSU, Hisayuki, SHINADA, Isao, TSUTSUI, Syouta, ARIMA, Hiroaki, OURA, Kimio
• Granted Patent: US 8,780,203 B2
• Time in Patent Office: Days
• US Class Current: 386/224
• CPC Class Codes: H04N 5/772 the recording apparatus and the television camera being placed in the same enclosure
• CPC Class Codes: H04N 5/783 Adaptations for reproducing at a rate different from the recording rate
• CPC Class Codes: H04N 5/91 Television signal processing therefor
• CPC Class Codes: H04N 7/0127 by changing the field or frame frequency of the incoming video signal, e.g. frame rate converter

Abstract

The present invention enables an effective use of a ring buffer. A video recording apparatus includes a first thinning process unit which reduces a data size of camera videos transmitted from a camera to a frame rate number of the camera videos, and which stores the camera videos having undergone a thinning process in a ring buffer, and a second thinning process unit which further reduces the data size of the videos stored in the ring buffer at a frame rate number in accordance with a condition among a plurality of conditions. The first thinning process unit stores the camera videos in the ring buffer at a frame rate that is the lowest common multiple of the frame rate numbers of the plurality of conditions.

Claims

1. A video recording apparatus comprising:

a first thinning process unit which reduces a data size of camera videos transmitted from a camera to a frame rate number smaller than a frame rate number of the camera videos, and which stores the camera videos having undergone a thinning process in a ring buffer; and

a second thinning process unit which has a frame rate number of a thinning process set in advance for each of a plurality of conditions, and which further reduces the data size of the videos stored in the ring buffer to the frame rate number in accordance with a condition among the plurality of conditions,

the first thinning process unit being configured to store the camera videos in the ring buffer at a frame rate number that is a lowest common multiple of the frame rate numbers of the plurality of conditions.

2. The video recording apparatus according to claim 1, wherein

the video recording apparatus comprises a plurality of the cameras,

frame rate numbers in accordance with the plurality of conditions are set for each camera, and

the first thinning process unit stores, for each camera, the camera videos in the ring buffer at a frame rate that is a lowest common multiple of the frame rate numbers of the plurality of conditions for each camera.

3. The video recording apparatus according to claim 1, wherein each condition is distinguished based on whether or not an alerting signal is input to the video recording apparatus.

4. A video recording system comprising:

a camera; and

the video recording apparatus according to claim 1.

5. A video recording method executed by a video recording apparatus, comprising steps of

reducing a data size of camera videos transmitted from a camera to a frame rate number smaller than a frame rate number of the camera videos and storing the camera videos having undergone a thinning process in a ring buffer, and

a frame rate number of a thinning process set in advance for each of a plurality of conditions, and which further reduces the data size of the videos stored in the ring buffer to the frame rate number in accordance with a condition among the plurality of conditions, the method comprising:

causing the first thinning process unit to store the camera videos in the ring buffer at a frame rate that is a lowest common multiple of the frame rate numbers corresponding to the plurality of conditions.

6. The video recording method according to claim 5, wherein frame rate numbers in accordance with the plurality of conditions are set for each of a plurality of cameras, and

the first thinning process unit stores, for each camera, the camera videos in the ring buffer at a frame rate number that is a lowest common multiple of the frame rate numbers in accordance with the plurality of conditions for each camera.