JP2007028223A - Device and method for recording and reproducing video image, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video image recording/reproducing device corresponding to multiple channels that can reduce hardware resources without deteriorating a frame rate to a maximum extent. <P>SOLUTION: The video image recording/reproducing device includes a first resolution-conversion means, which converts the resolution of video image data of a prespecified number of channels to the resolution of video image data different in screen size while guaranteeing the quality of a processing time or the like, and a second resolution-conversion means for converting the resolution of the video image data to the resolution of the video image data different in screen size to the best within calculation resources without guaranteeing the quality of the processing time or the like. A video image recording/reproducing means controls so as to switch the resolution conversion of a prescribed channel using the first resolution-conversion means to the resolution conversion by the second resolution-conversion means if there is no available first resolution-conversion means when recording and reproducing a new channel. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a video recording / reproducing apparatus and method, and a program for recording, reproducing, and displaying digitized video transmitted from a broadcasting station, a video camera, a network connection type camera, or the like.

  In recent years, with the development of high-capacity and high-speed recording media such as hard disks and writable DVDs, and the progress of digital video compression technology such as MPEG and motion JPEG, video sent from broadcast stations, video cameras, etc. has been digitalized. 2. Description of the Related Art Video recording / playback apparatuses that are used for recording, recording on a recording medium, and playing back are widely used.

Further, as mobile phones and personal digital assistants have higher functions, there is an increasing need to reproduce and display video recorded on the video recording / playback apparatus from a remote location.
This video recording / playback apparatus is being used as a surveillance camera system by recording video from a camera connected to a network via the network as the bandwidth of a network such as the Internet or a LAN increases.

A video recording / playback apparatus in a surveillance camera system needs to be able to simultaneously record and play back video (multi-channel video) from a plurality of cameras.
Further, these images need to be recorded for a predetermined period.

In general, in order to record and reproduce and display multi-channel video, a lot of hardware resources are required, resulting in an increase in cost.
Therefore, the following techniques have been disclosed in order to perform video recording and playback display with less hardware resources.

  In the surveillance video recording / playback apparatus and surveillance video recording / playback method described in Patent Document 1, when a video is digitized and recorded and displayed, a moving object detection unit and a resolution conversion unit are provided. Usually, by the resolution conversion unit, The input video digital data is converted to low resolution, recorded and displayed, and based on the detection signal indicating that the moving body has been detected by the detection means, the low resolution conversion is stopped and the high resolution data is recorded and displayed. Thus, continuous recording for a certain period is realized with a recording medium having a smaller capacity.

  In the video reproduction apparatus described in Patent Document 2, when reproducing and displaying a plurality of channels of digital video that have been compressed and recorded, data restoration means for restoring compressed data is provided for each channel, and data from the data restoration means is stored. A / D conversion means for converting to an analog signal and a multi-screen means for forming a multi-screen from the analog signal, or a multi-screen means for forming a multi-screen from data by the data restoration means, and multi-screen data Multi-screen display is performed by A / D conversion means for converting the signal into an analog signal, and multi-channel display is realized by one display device.

  In the video recording / reproducing apparatus described in Patent Document 3, when reproducing and displaying a compressed and recorded digital video of a plurality of channels, an image expansion unit for expanding the video read from the recording medium, and an output from the image expansion unit A field extracting means for extracting one field from each frame of the received signal and an image size reducing means for calculating a display rate according to the number of divided display screens, and a field extracting means when lower than the default display rate The image is reduced by an image size reduction means and divided into screens, and a natural thinning display of a plurality of channels is realized within a certain hardware processing capability.

JP 2002-101410 A Japanese Patent Laid-Open No. 8-125973 JP 2003-309810 A

  However, in the surveillance video recording / playback apparatus and surveillance video recording / playback method described in Patent Document 1, since the recorded video size and the display size are the same, a new resolution conversion means is used as the video storage means for displaying at different sizes. When the number of channels is increased, resolution conversion means twice as many as the number of channels is required.

  In addition, in the video reproduction apparatus described in Patent Document 2, when the multi-screen display means is an analog type, D / A converters corresponding to the number of channels are required, and when the multi-screen display means is a digital type, In addition, it is necessary to provide a multi-screen means having a resolution conversion capability for the number of channels. In order to perform resolution conversion and recording, a resolution converter for the number of channels is provided between the digital compressor and the data multiplexing unit. It is necessary to provide a data multiplexing unit having resolution conversion capability corresponding to the number of channels.

  The video recording / reproducing apparatus described in Patent Document 3 can display a plurality of channels within a certain hardware processing capability. However, as the number of channels increases, the frame rate of all channel displays decreases. There is a risk of missing an important scene.

  Therefore, an object of the present invention is to provide a multi-channel video recording / reproducing apparatus and method capable of reducing hardware resources without reducing the frame rate as much as possible.

  The video recording / reproducing apparatus of the present invention is a video recording / reproducing apparatus for recording, reproducing and displaying digitized video data, video input means for receiving input of several channels of video data, and video data of a predetermined number of channels. The first resolution conversion means for guaranteeing the quality of processing time and the like, and converting the resolution to video data of different screen sizes, and the best in computing resources without guaranteeing the quality of the video data processing time and the like Second resolution converting means for converting the resolution into video data of different sizes, video recording means for recording the video data on a recording medium, video reproducing means for reading the video data recorded on the recording medium, and displaying the video data Display means for displaying at a predetermined position on the screen, and video data from the video input means or the video reproduction means as the first resolution conversion means or the first resolution conversion means; A video recording / playback control means for controlling the resolution to be recorded by the video recording means and recorded on a recording medium or displayed on the display screen by the display means. When recording or reproducing a channel, if there is no free space in the first resolution conversion means, the predetermined channel using the first resolution conversion means is switched to resolution conversion by the second resolution conversion means. To control.

  The video recording / playback method of the present invention is a video recording / playback method for recording, playing back and displaying digitized video data, receiving a plurality of channels of video data, and preliminarily defining the number of channels of video data, The first resolution conversion process that guarantees the quality of processing time and the like, and converts the resolution to video data with different screen sizes, and the best of the screen size within the computing resource without guaranteeing the quality of the processing time etc. of the video data A second resolution converting step for converting the resolution into different video data, a video recording step for recording the video data on a recording medium, a video reproducing step for reading the video data recorded on the recording medium, and the video data on the display screen A display step of displaying the image data at a predetermined position, and the video data is resolution-converted by the first resolution conversion step or the second resolution conversion step, and the video A video recording / playback control step for controlling recording or display on a recording medium by a recording step, and the video recording / playback control step is free of the first resolution conversion step when recording and playing back a new channel. When there is no signal, control is performed so that a predetermined channel using the first resolution conversion process is switched to resolution conversion by the second resolution conversion process.

  According to the video recording / reproducing apparatus of the present invention, a specific channel is processed without reducing the frame rate, and the other channels are also processed optimally within the range of computing resources. Therefore, the frame rate is reduced as much as possible. This also has the effect of reducing hardware resources and supporting multiple channels.

  In addition, since the amount of computation of the channel for performing resolution conversion processing in the computation resource is reduced, there is an effect that computation resources necessary for processing at the same frame rate can be reduced.

  In addition, since the calculation amount is estimated based on the screen size before and after the resolution conversion, there is an effect that the switching target channel can be selected with a small processing amount.

  In addition, since the channel having less adverse effect due to quality deterioration is switched to the resolution conversion processing within the operation resource, even when the frame rate is reduced beyond the operation resource, the adverse effect can be reduced.

  In addition, since the display screen is switched from the small channel of the display screen to the resolution conversion processing within the computational resource, even if the frame rate is reduced beyond the computational resource, the frame rate of the small channel of the display screen with a small visual impact is lowered, which is adversely affected. There is an effect that can be reduced.

  In addition, the quality-resolved resolution conversion process is performed on the alarm-detected channel, and the frame rate does not decrease.

  In addition, since the channel switched to the second resolution conversion unit is displayed via the display unit, there is an effect that the user can know that the channel has been switched.

An embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a block diagram and a system configuration diagram of a video recording / reproducing apparatus showing an embodiment of the present invention.
In FIG. 1, 110 is a LAN (Local Area Network), a network such as the Internet, 120-1 to 120-N is a network camera that distributes captured images via the network 110, and 130-1 to 130-M are network 110 Mobile phone that can be connected to a mobile phone, a remote terminal such as a portable information terminal, 140 a display device such as a television or display, 150 an infrared remote controller, an operation input device such as a portable information terminal equipped with a short-range wireless transmission function, and 160 a hard disk A video data recording medium such as a drive and a writable DVD, 100 is distributed from the network cameras 120-1 to 120-N, records video on the video data recording medium 160, and displays it on the display device 140. In response to an operation from the remote terminals 130-1 to 130-N, the video recording / reproducing for reproducing and displaying the video recorded on the video data recording medium 160 on the display device 140 or the remote terminals 130-1 to 130-N is performed. It is a device.

  The video recording / playback apparatus 100 includes a network interface, a network protocol, etc., and receives video data from the network cameras 120-1 to 120-N and distributes video data to the remote terminals 130-1 to 130-M. It consists of an output unit 102, variable length code decoder, inverse discrete cosine transform computing unit, etc., and decodes video data encoded in video formats such as Motion-JPEG and MPEG2 / 4 into video formats such as RGB bitmap and YUV bitmap The video data is composed of a quality assurance type decoding unit 103 that guarantees the quality of the decoding time, etc. by predefining the number of channels of video data to be processed in the decoding unit and processing resources, etc., resample processing, filter processing, etc. By predefining the number of channels of video data to be processed especially by the resolution conversion unit that performs reduction, computing resources, etc. Quality assurance type resolution converter 104 that guarantees quality such as conversion time, resolution conversion that simultaneously performs resolution conversion at the time of decoding, best within the range of processing resources at the time of processing without specifying the number of channels in the code part Best-effort resolution conversion decoding unit 109 that performs the above processing, Encoding unit 108 that encodes video data of video formats such as RGB bitmap and YUV bitmap into video formats such as Motion-JPEG and MPEG2 / 4, TV / display output It consists of an interface, frame buffer, etc. It consists of a display unit 105 that displays video data such as RGB bitmap and YUV bitmap on the display device 140, an infrared interface, a short-range wireless interface, etc., and accepts video recording and playback operation input Video consisting of operation input unit 106, recording medium interface, file system, etc. A video recording / playback unit 107 that records data on the video data recording medium 160, plays back and reads, a CPU, a memory, a program, and the like, and includes remote terminals 130-1 to 130- via the operation input unit 106 or the video input / output unit 102. The video data received from the video input / output unit 102 through the quality assurance decoding unit 103, the quality assurance type resolution conversion unit 104, the best effort type resolution conversion decoding unit 109, and the encoding unit 108 as appropriate based on the operation from M. Is recorded by the video recording / playback unit 107 or displayed by the display unit 105, and the video data reproduced from the video recording / playback unit 107 is displayed by the display unit 105 or distributed to the remote terminals 130-1 to 130-M by the video input / output unit 102. It comprises a video recording / playback control unit 101 that performs control.

  Here, when the video recording / playback control unit 101 determines that there is no free space in the quality assurance type resolution conversion unit 104, the video recording / playback control unit 101 converts the predetermined channel using the quality assurance type resolution conversion unit 104 to the best effort type resolution conversion decoding unit. Control to switch to 109.

FIG. 2 is a layout diagram of the display screen of the video recording / reproducing apparatus showing the embodiment of the present invention.
In FIG. 2, 200 is a split display screen, a 1280 x 960 dot display screen, two 640 x 480 dot screens, four 320 x 240 dot screens, and 16 160 x 120 dot screens. An example is shown that is divided into a total of 22 screens.

  The split display screen 200 is realized by writing video data appropriately converted in resolution to the address of the frame buffer corresponding to the coordinates of the split screen on the display unit 105.

3-1 to 3-3 are conceptual diagrams of management information of the video recording / reproducing apparatus showing the embodiment of the present invention.
3-1 to 3-3, 301 is a camera ID uniquely assigned to the network camera 120-1 to 120-N in the system, camera management information including the IP address of the camera, 302 is the system Remote terminal management information consisting of the remote terminal ID uniquely assigned to the remote terminals 130-1 to 130-N, the IP address of the remote terminal, the display screen size, etc., 303 is an individual display screen divided in the split display screen 200 Display screen ID uniquely assigned to the display screen, display screen management information including the display screen coordinates of the display screen, the display screen size, etc., 304 is a decoder ID uniquely assigned to each decoding channel that can be processed by the quality assurance decoding unit 103 Decoder management information including decoder settings set for the decoding channel, 305 is a quality assurance type resolution converter 104 and best effort type resolution conversion data The resolution conversion ID uniquely assigned to each resolution conversion channel that can be processed by the code unit 109, a type indicating whether the resolution conversion channel is a quality assurance type or a best effort type, and a conversion size set for the resolution conversion channel Resolution converter management information, 306 is an encoder ID uniquely assigned to each encoding channel that can be processed by the encoding unit 108, encoder management information including encoder settings set for the encoding channel, and 307 is recorded on the video data recording medium 160 Recording video ID uniquely assigned to the recorded video data recorded, recording video management information consisting of the camera ID of the recorded video, recording date and time, and recording time, 308 is recorded, played back and displayed by the video recording and playback control unit 101 Channel ID uniquely assigned to a video channel, channel type of that video channel, input type, Power ID, the decoder ID, resolution conversion ID, the encoder ID, type of output, a video channel management information consisting of output ID.

In the video channel management information 308, “live video display” of the channel type means that video data received from the network cameras 120-1 to 120-N is displayed on the display device 140, and “remote live display” means network Displaying video data received from the cameras 120-1 to 120-N on the remote terminals 130-1 to 130-M. “Remote playback” means playing back recorded video on the remote terminals 130-1 to 130-M. That is.
Here, each of the management information 301 to 308 is stored in a memory or the like of the video recording / playback control unit 101, and the video recording / playback control unit 101 appropriately reads the management information and performs video recording / playback display control.

FIG. 4 is a flowchart of the main process of the video recording / reproducing apparatus showing the embodiment of the present invention.
In the main process of the video recording / playback apparatus, the video recording service process shown in FIG. 5 is started (S401), the video playback display service process shown in FIGS. 8-1 to 8-3 is started (S402), and FIG. 1 to 9-2 are started (S403), and a stop operation from the operation input unit 106 or the like is awaited (S404, No). If there is a stop operation (S404, Yes), video recording service processing stops (S441), video playback display service processing stops (S442), video remote playback display service processing stops (S443), and processing ends. To do.

FIG. 5 is a flowchart of the video recording service process of the video recording / playback apparatus showing the embodiment of the present invention.
In the video recording service process, the camera ID is sequentially read from the camera management information 301 (S501), and if the camera ID has not ended (S502, No), the camera ID is the input ID of the video channel management information 308, and the input type is `` Set to `` Camera '' (S521), read the recorded video ID corresponding to the camera ID from the recorded video management information 307, set the output ID and output type of the video channel management information 308 to `` recorded video '' (S522), and input If the size and format of the video and the output (recording) video are the same (S523, Yes), the video channel processing shown in FIG. 7 is started (S527), and is repeated from S501. If the input video and the output video are different (S523, No), if there is a free quality assurance resolution converter (S524, Yes), the free quality assurance resolution conversion ID from the resolution converter management information 305 is managed by the decoder. An empty decoder ID is obtained from the information 304 and set to the resolution conversion ID and decoder ID of the video channel management information 308 (S525), and an empty encoder ID is obtained from the encoder management information 306 to obtain the encoder ID of the video channel management information 308. (S526), and the processing from S527 is continued. If there is no free quality assurance type resolution converter (S524, No), the resolution converter switching process shown in Fig. 6 is performed (S541), and if the switching process is successful (S542, Yes), the process from S525 is continued. To do. If the switching process fails (S542, No), the best effort resolution conversion ID is acquired from the resolution converter management information 305 and set as the resolution conversion ID of the video channel management information 308 (S543), and the processing from S526 is performed. continue.

  If the camera ID is finished (S502, Yes), the video recording service process stop from the main process is waited (S503, No), and if there is a stop instruction (S503, Yes), all started video channels The process is stopped (S531), and the process is terminated.

FIG. 6 is a flowchart of resolution converter switching processing of the video recording / reproducing apparatus showing the embodiment of the present invention.
In the resolution converter switching process, live video display channel information is sequentially read from the video channel management information 308 (S601), the live video display channel is not finished (S602, No), and that channel uses a quality assurance type resolution converter. (S603, Yes), not during alarm detection by image analysis processing or external sensor input (not shown) (S631, No), the conversion size is the smallest among the live video display channels read out, and within that If the input size is the minimum (S632, Yes), that channel is stored as the minimum video display channel (S633), and the processing is repeated from S601. If the resolution converter is not a quality assurance type (S603, No), an alarm is being detected (S631, Yes), or if the conversion size is not minimum or the input size is not minimum (S632, No), the processing is repeated from S601. When the live video display channel is finished (S602, Yes), when the minimum video display channel exists and the size is smaller than the new channel (S621, Yes), the corresponding video channel processing is paused (S622), and the resolution is converted. Switch to the best effort type (S623), display that the corresponding channel has been switched via the display unit 105 (S624), restart the corresponding video channel processing (S625), and switch the resolution converter and decoder. Release (S626) and end the process. If the minimum video display channel does not exist or is larger than the new channel (S621, No), a setting is made to indicate that the switching of the resolution converter has failed (S641), and the process ends.

FIG. 7 is a flowchart of the video channel processing of the video recording / playback apparatus showing the embodiment of the present invention.
In video channel processing, input / output destinations such as the video recording / playback unit 107, video input / output unit 102, and display unit 105 corresponding to the input ID and output ID in the video channel management information 308 are opened (S701), and the video channel processing stops. (S702, No), video channel processing is not paused (S703, No), video data corresponding to the input ID is read (S704), and decoder ID is set (S705, Yes) When the video data is decoded by the corresponding decoder (S751) and the resolution conversion ID is set (S706, Yes), the video data is converted by the corresponding resolution converter (S761), and the encoder ID is set. If yes (S707, Yes), the video data is encoded by the corresponding encoder (S771), the video data is written to the output destination corresponding to the output ID (S708), and the process is repeated from S702. When video channel processing is stopped (S702, Yes), the input / output destination is closed, the decoder, resolution converter, and encoder corresponding to each of the decoder ID, resolution conversion ID, and encoder ID are released (S721), and the processing is performed. finish. When the video channel processing is paused (S703, Yes), it waits for an instruction to resume the video channel processing (S731, No). If there is an instruction to resume (S731, Yes), the processing is continued from S704.

8A to 8C are flowcharts of the video playback display service process of the video recording / playback apparatus showing the embodiment of the present invention.
In the video playback display service processing, the display screen ID is sequentially read from the display screen management information 307 (S801), and if the display screen ID has not ended (S802, No), the display screen ID associated with the management information (not shown) Is set to the input ID of the video channel management information 308, the input type is set to “Camera” (S821), the display screen ID is set to the output ID of the video channel management information 308, and the output type is set to “display screen”. (S822), and if there is a free quality assurance type resolution converter (S823, Yes), the free quality assurance type resolution conversion ID from the resolution converter management information 305 and the decoder ID from the decoder management information 304 are set. Obtained and set to the resolution conversion ID and decoder ID of the video channel management information 308 (S824), starts the video channel processing shown in FIG. 7 (S825), and repeats from S801. If there is no free quality assurance type resolution converter (S823, No), the resolution converter switching process shown in FIG. 6 is executed (S871) .If the switching process is successful (S872, Yes), the process from S824 is performed. continue. If the switching process fails (S872, No), the best effort resolution conversion ID is acquired from the resolution converter management information 305 and set as the resolution conversion ID of the video channel management information 308 (S873), and the processing from S825 is performed. continue.

  When the display screen ID is finished (S802, Yes) and an instruction to stop the video playback display service process is given (S803, Yes), all the started video channel processes are stopped (S831), and the process ends. If the video playback display service processing stop is not instructed (S803, No), if there is a recorded video playback operation (S804, Yes), the corresponding video channel processing is paused (S841), and the camera ID is recorded from the recorded video management information 307. Read the recorded video ID corresponding to the input ID of the video channel management information 308, set the input type to “recorded video” (S842), restart the corresponding video channel processing (S843), and perform live video display operation. (S805, Yes), the corresponding video channel processing is paused (S851), the camera ID corresponding to the recorded video ID is read from the recorded video management information 307, and the input type is set to the input ID of the video channel management information 308. "Camera" is set (S852), the corresponding video channel processing is restarted (S853), and if there is no display screen change (S806, No), the process is repeated from S803. If there is a display screen change (S806, Yes), the corresponding video channel processing is paused (S861), the specified camera ID is read, the input ID of the video channel management information 308 is set, and the input type is set to “camera” If the quality assurance type resolution converter is in use from the resolution conversion ID of the video channel management information 308 and the resolution converter management information 305 (S863, Yes), the corresponding video channel processing is resumed (S862). Repeat from S864) and S803.

  If the quality assurance type resolution converter is not in use (S863, No), and if there is an empty quality assurance type resolution converter (S881, Yes), the resolution conversion ID of the available quality assurance type resolution converter from the resolution converter management information 305 Then, the decoder ID is acquired from the decoder management information 304 and set to the resolution conversion ID and the decoder ID of the video channel management information 308 (S882), the corresponding video channel processing is resumed (S864), and the process is repeated from S803. If there is no free quality assurance type resolution converter (S881, No), the resolution converter switching process shown in FIG. 6 is executed (S891). If the switching process is successful (S892, Yes), the process from S882 is executed. continue. If the switching process fails (S892, No), the best effort resolution conversion ID is acquired from the resolution converter management information 305 and set as the resolution conversion ID of the video channel management information 308 (S893), and the process from S864 is performed. continue.

FIG. 9A to FIG. 9B are flowcharts of video remote playback display service processing of the video recording / playback apparatus showing the embodiment of the present invention.
In the video remote playback display service process, the video remote playback display service process is not instructed to stop (S901, No), the live video remote display request is not requested (S902, No), and the recorded video remote playback request is not requested (S903 , No), if the video remote playback display process is not stopped (S904, No), repeat from S901. When an instruction to stop the video remote playback display service processing is given (S901, Yes), the processing of all the started video channels is stopped (S911), and the processing ends. When the video remote playback display process is stopped (S904, Yes), the designated video channel process is stopped (S941), and the process is repeated from S901.

  When a live video remote display request is made (S902, Yes), the specified camera ID is set to the input ID of the video channel management information 308, the input type is set to `` camera '' (S921), and the remote terminal ID is set to the video channel management information If the input type is set to “Remote terminal” for the output ID of 308 (S922), and the size and format of the input video and output video are the same (S923, Yes), the video channel processing shown in FIG. 7 is started. (S927) and repeat from S901. If the input video and the output video are different (S923, No), if there is a free quality assurance resolution converter (S924, Yes), the free quality assurance resolution conversion ID from the resolution converter management information 305 is managed by the decoder. An empty decoder ID is acquired from the information 304 and set to the resolution conversion ID and decoder ID of the video channel management information 308 (S925), and an empty encoder ID is acquired from the encoder management information 306 to obtain the encoder ID of the video channel management information 308. (S926), and the processing from S927 is continued. If there is no free quality assurance type resolution converter (S924, No), the resolution converter switching process shown in FIG. 6 is performed (S951). If the switching process is successful (S952, Yes), the process from S925 is continued. To do. If the switching process fails (S952, No), the best effort resolution conversion ID is acquired from the resolution converter management information 305 and set as the resolution conversion ID of the video channel management information 308 (S953), and the process from S926 is performed. continue.

  When a recorded video remote playback request is made (S903, Yes), the recorded video ID corresponding to the specified camera ID is read from the recorded video management information 307 and is set to the input ID of the video channel management information 308, and the input type is set to “recorded video”. Set (S931) and continue processing from S922.

  Note that the program code for each step shown in FIGS. 4 to 7, 8-1 to 8-3, and 9-1 to 9-2 is a program stored in a RAM or ROM of a computer. It can be realized by operating. This program and a computer-readable storage medium storing the program are included in the embodiment of the present invention.

  Specifically, the program is recorded on a recording medium such as a CD-ROM or provided to a computer via various transmission media. As a recording medium for recording the program, besides a CD-ROM, a floppy (registered trademark) disk, a hard disk, a magnetic tape, a magneto-optical disk, a nonvolatile memory card, or the like can be used. On the other hand, as the transmission medium of the program, a communication medium (wired line such as an optical fiber, etc.) in a computer network (LAN, WAN such as the Internet, wireless communication network, etc.) system for propagating and supplying program information as a carrier wave A wireless line or the like.

  In addition, the functions of the above-described embodiments are realized by executing a program supplied by a computer, and the program is used in cooperation with an OS (operating system) or other application software running on the computer. When the functions of the above-described embodiment are realized, or when all or part of the processing of the supplied program is performed by a function expansion board or a function expansion unit of the computer, the function of the above-described embodiment is realized. Such a program is included in the embodiment of the present invention.

  For example, FIG. 10 is a schematic diagram illustrating an internal configuration of a personal user terminal device. In FIG. 10, reference numeral 1200 denotes a computer PC. The PC 1200 includes a CPU 1201 and executes device control software stored in a ROM 1202 or a hard disk (HD) 1211 or supplied from a floppy (registered trademark) disk drive (FD) 1212 and connected to the system bus 1204. Control the device as a whole.

  The program stored in the CPU 1201 of the PC 1200, the ROM 1202 or the hard disk (HD) 1211 is shown in FIGS. The procedure of each step is realized.

  Reference numeral 1203 denotes a RAM which functions as a main memory, work area, and the like for the CPU 1201. A keyboard controller (KBC) 1205 controls instruction input from a keyboard (KB) 1209, a device not shown, or the like.

  Reference numeral 1206 denotes a CRT controller (CRTC), which controls display on a CRT display (CRT) 1210. A disk controller (DKC) 1207 is a hard disk (boot program (start program: a program that starts execution (operation) of personal computer hardware and software)), a plurality of applications, editing files, user files, a network management program, and the like. HD) 1211 and floppy (registered trademark) disk (FD) 1212 are controlled.

  Reference numeral 1208 denotes a network interface card (NIC) that performs bidirectional data exchange with a network printer, another network device, or another PC via the LAN 1220.

1 is a block diagram and a system configuration diagram of a video recording / reproducing apparatus showing an embodiment of the present invention. It is a layout figure of the display screen of the video recording / reproducing apparatus which shows embodiment of this invention. It is a conceptual diagram of the management information of the video recording / reproducing apparatus showing the embodiment of the present invention. It is a conceptual diagram of the management information of the video recording / reproducing apparatus showing the embodiment of the present invention. It is a conceptual diagram of the management information of the video recording / reproducing apparatus showing the embodiment of the present invention. It is a flowchart of the main process of the video recording / reproducing apparatus which shows embodiment of this invention. It is a flowchart of the video recording service process of the video recording / reproducing apparatus which shows embodiment of this invention. It is a flowchart of the resolution converter switching process of the video recording / reproducing apparatus which shows embodiment of this invention. It is a flowchart of the video channel process of the video recording / reproducing apparatus which shows embodiment of this invention. It is a flowchart of the video reproduction | regeneration display service process of the video recording / reproducing apparatus which shows embodiment of this invention. It is a flowchart of the video reproduction | regeneration display service process of the video recording / reproducing apparatus which shows embodiment of this invention. It is a flowchart of the video reproduction | regeneration display service process of the video recording / reproducing apparatus which shows embodiment of this invention. It is a flowchart of the video remote reproduction | regeneration display service process of the video recording / reproducing apparatus which shows embodiment of this invention. It is a flowchart of the video remote reproduction | regeneration display service process of the video recording / reproducing apparatus which shows embodiment of this invention. It is a schematic diagram which shows the internal structure of a personal user terminal device.

Explanation of symbols

100 video recording and playback device
101 Video recording / playback controller
102 Video input / output section
103 Quality assurance decoding unit
104 Quality assurance type resolution converter
105 Display
106 Operation input section
107 Video recording / playback section
108 Encoding section
109 Best-effort resolution conversion decoder
200 split screen
301 Camera management information
302 Remote terminal management information
303 Display screen management information
304 Decoder management information
305 Resolution converter management information
306 Encoder management information
307 Recorded video management information
308 Video channel management information

Claims (9)

In a video recording / reproducing apparatus for recording, reproducing and displaying digitized video data,
Video input means for receiving input of video data of a plurality of channels;
First resolution conversion means for guaranteeing quality such as processing time, and converting the resolution of video data of a predetermined number of channels into video data having different screen sizes;
Second resolution converting means for converting the resolution of the video data into video data having a different screen size best within a computing resource without guaranteeing the quality of processing time or the like; and video recording means for recording the video data on a recording medium; Video reproducing means for reading video data recorded on the recording medium;
Display means for displaying video data at a predetermined position on the display screen;
The video data from the video input means or the video playback means is converted in resolution by the first resolution conversion means or the second resolution conversion means, and recorded on a recording medium by the video recording means or displayed by the display means. Video recording / playback control means for controlling to display on
The video recording / playback control means assigns a predetermined channel using the first resolution conversion means to the second channel when there is no free space in the first resolution conversion means during recording and playback of a new channel. A video recording / reproducing apparatus that controls to switch to resolution conversion by the resolution conversion means.   When switching from the first resolution conversion means to the second resolution conversion means, the video recording / playback control means determines that the processing by the second resolution conversion means requires the least amount of computing resources. The video recording / reproducing apparatus according to claim 1, wherein a channel is selected.   3. The video recording / playback control means determines that the channel with the smallest screen size before conversion among the channels with the smallest screen size after resolution conversion requires the least amount of computing resources. The video recording / reproducing apparatus as described.   The video recording / playback control means, when switching from the first resolution conversion means to the second resolution conversion means, when quality degradation such as frame dropping occurs in the second resolution conversion means, 2. The video recording / reproducing apparatus according to claim 1, wherein a channel determined to have the least adverse effect is selected.   5. The video recording / playback apparatus according to claim 4, wherein the video recording / playback control means determines that the channel displaying the input video having the smallest screen size has the least adverse effect due to quality degradation. Provide alarm detection means to detect image changes by video analysis or / and external sensors, etc.
6. The video recording / reproducing apparatus according to claim 4, wherein the video recording / reproducing control means determines that the channel in which the alarm is being detected by the alarm detecting means has a great adverse effect due to frame dropping.   The video recording / playback control means displays the channel switched to the second resolution conversion means via the display means when switching from the first resolution conversion means to the second resolution conversion means. The video recording / reproducing apparatus according to claim 1, wherein: In a video recording / reproducing method for recording, reproducing and displaying digitized video data,
Receiving a plurality of channels of video data input;
A first resolution converting step of guaranteeing quality such as processing time and converting the resolution of video data of a predetermined number of channels into video data having different screen sizes;
A second resolution conversion step of converting the resolution of video data into video data having a different screen size, optimally within the computational resources without guaranteeing the quality of processing time and the like;
A video recording process for recording video data on a recording medium;
A video playback step of reading video data recorded on the recording medium;
A display process for displaying video data at a predetermined position on the display screen;
A video recording / playback control step for controlling the video data to be converted by the first resolution conversion step or the second resolution conversion step and recorded or displayed on a recording medium by the video recording step;
In the video recording / playback control step, when a new channel is recorded and played back, if there is no free space in the first resolution conversion step, a predetermined channel that uses the first resolution conversion step is changed to the second channel. A video recording / reproducing method comprising: controlling to switch to resolution conversion in the resolution conversion step of.   The program for making a computer implement each process of the video recording / reproducing method of Claim 8.

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