JP2018011113A - Video recording and playback system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem in that in a video and monitor system in recent years, the image quality of a camera video, the rating of frame, the capacity of HDD incorporated in a recorder have been increased, and hence processing capability required for a recorder has also been increased, to cope with which, prior art provides an external processing device in addition to a recorder and retrieves a video, in which case a cost increase for carry, space or the like for the device installation are involved.SOLUTION: A video recording and playback system comprises a processing section including: a retrieval processing section; and an image processing section that performs an image correction process. In the processing section, one of a retrieval process in the retrieval processing section and the image correction process in the image processing section is performed.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a video recording / playback apparatus connected to a surveillance camera, and particularly has a video search function.

  2. Description of the Related Art In recent years, a surveillance camera system in which a plurality of cameras are connected to a recorder and an image photographed by each camera is recorded on a HDD (Hard Disk Drive) built in the recorder has become common in the video surveillance system. In addition, the video of the camera has been improved in image quality and frame rate, and the HDD built in the recorder has been increased in capacity, so that a clear video can be recorded for a long time. However, with the increase in image quality and frame rate of video, the processing capability required of recorders has increased. Further, as the capacity of an HDD increases, it is difficult to find the video when the shooting time of the video to be reproduced is not clearly known, which increases the burden on the user.

  2. Description of the Related Art Conventionally, there is a technique for searching a recorded video according to a condition specified by the user and reproducing the target video for the purpose of reducing the load on the user during video playback. In Patent Document 1, an external processing device is connected to a recorder, a video recorded on the HDD of the recorder is read to the external processing device, and the external processing device searches for the conditions specified by the user, and the target video is recorded externally. There has been disclosed a video recording system that extracts a recorded video that satisfies a condition specified by the user without applying a load at the time of video search to the recorder by re-recording on the medium and playing it when requested by the user.

JP 2011-188370 A

  In the prior art disclosed in Patent Document 1, there is a problem that, in addition to the recorder, an external processing device is required, which increases costs during operation and requires a space for installing a new device. The present invention has been made to solve the above-described problems.

  The present invention has been made to solve the above-described problems. According to the present invention, a video recording / playback apparatus connected to a camera via a network plays back a first video stream for retrieval from the camera. A receiver for receiving the second video stream for decoding, the first video stream for search to the first video data after decoding, and the second video stream for playback to the second video data after decoding A decoding unit that performs a decoding process, an input unit that receives a search condition, a search processing unit that performs a search process that searches for a video frame that matches the search condition using the first video data after decoding, and a second after decoding A processing unit including an image processing unit that performs image correction processing using video data. In the processing unit, search processing in the search processing unit and image correction processing in the image processing unit Deviation or to implement one.

  According to the present invention, it is possible to realize video search without using an external processing device and without increasing the processing capability of the recorder. As a result, it is possible to obtain the effects of suppressing the operation cost of the video surveillance system and reducing the installation space.

It is a block diagram of the whole video surveillance system including the video recording / reproducing apparatus by Embodiment 1 of this invention. It is a function block diagram of the video recording / reproducing apparatus 102 by Embodiment 1 of this invention. It is a conceptual diagram of the 1st video stream for a search transmitted from the camera by Embodiment 1 of this invention, and the 2nd video stream for reproduction | regeneration. It is a block diagram which shows the hardware constitutions of the video recording / reproducing apparatus 102 by Embodiment 1 of this invention. It is an operation | movement flowchart by Embodiment 1 of this invention. It is an example of a display of the main screen of the monitor connected to the output part 213 by Embodiment 1 of this invention. It is an example of a display of the camera selection screen of the monitor connected to the output part 213 by Embodiment 1 of this invention. It is explanatory drawing which shows the screen which a user designates the camera made into search object. It is an operation | movement flowchart by Embodiment 2 of this invention. It is a display example of the thumbnail display screen of the monitor connected to the output part 213 by Embodiment 2 of this invention.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram of an entire video monitoring system including a video recording / reproducing apparatus according to Embodiment 1 of the present invention. In FIG. 1, a camera 101 and a video recording / playback apparatus 102 are connected to a network 103. The camera 101 transmits the video obtained by shooting the target area as a first video stream for search and a second video stream for playback to the video recording / playback apparatus 102 via the network 103. The video recording / playback apparatus 102 records the received video. The video may be an image. The monitor 104 displays the video captured by the camera 101 input from the video recording / playback apparatus 102 and the operation screen of the video recording / playback apparatus 102. Further, the video recording / reproducing apparatus 102 can be operated by the user with the input apparatus 105. Note that the camera 101 is also referred to as an imaging device, and more specifically, may be a surveillance camera, or a plurality of cameras may be connected. Further, the camera 101 and the video recording / reproducing apparatus 102 may be directly connected.

  FIG. 2 is a functional configuration diagram of the video recording / reproducing apparatus 102 according to Embodiment 1 of the present invention. The receiving unit 201 receives the first video stream 202 for search and the second video stream 203 for reproduction from the camera 101 via the network 103.

  FIG. 3 is a conceptual diagram of the first video stream 202 for search and the second video stream 203 for playback received by the video recording / playback apparatus 102 according to the first embodiment of the present invention. The camera 101 always transmits the first video stream 202 for search and the second video stream 203 for playback, and the video recording / playback apparatus 102 always transmits the first video for search from each camera. A stream 202 and a second video stream 203 for reproduction are received. A plurality of cameras 101 may be connected to the video recording / reproducing apparatus 102. In FIG. 3, the first video stream 202 for search and the second video stream 203 for reproduction are represented by separate lines for convenience, but different streams may be used, and the same communication line may be connected. May be used to communicate. It is assumed that the first video stream 202 for search is about QVGA (Quadruple Video Graphics Array) and about 1 fps, and the second video stream 203 for reproduction is about Full HD (Full High Definition) and about 30 fps.

The first video stream 202 for search has a lower resolution or a lower frame rate than the second stream 203. Since the data amount of the first video stream 202 for search is smaller than the data amount of the second stream 203, an effect that the time required for the search process is shortened can be obtained.
The second video stream 203 for reproduction has a higher resolution or a higher frame rate than the first stream 202. Since the amount of data in the second video stream 202 for reproduction is larger than the amount of data in the second stream 203, the reproduction process can be performed with high resolution. It is possible to obtain an effect that the image can be shown better.

  Returning to FIG. The first video stream 202 for search is recorded in the first recording unit 204. The second video stream 203 for reproduction is recorded in the second recording unit 205 and input to the decoding unit 209. The processing unit 206 includes a search processing unit 207 and an image processing unit 208. While the search processing unit 207 is processing, the processing of the image processing unit 208 is stopped. That is, either the search processing unit 207 or the image processing unit 208 is operated. Alternatively, it is said to operate exclusively or alternatively. Thereby, it is possible to realize search processing and image processing within the video recording / reproducing apparatus 102 without increasing the processing load of the entire processing unit 206. A specific example of the processing performed by the image processing unit 208 is image correction processing for better displaying an image such as super-resolution processing.

The first video stream 202 for search is decoded by the decoding unit 209 and input to the search processing unit 207 of the processing unit 206 as first video data 210 after decoding.
The second video stream 203 for reproduction is decoded by the decoding unit 209 and input to the image processing unit 208 of the processing unit 206 as second video data 211 after decoding. The image processing unit 208 performs image correction processing for better displaying the image such as super-resolution processing on the second video data 211 after decoding, and outputs the second video data 212 after image processing to the output unit Input to 213.

  The input unit 214 receives a user operation for inputting search information. Specific examples of search information include a search start instruction and search conditions. Specific examples of the search condition include “search range” and “extraction image condition”. The search range is, for example, a search target period, a shooting camera, or the like. The extracted image condition is, for example, extracting a video frame with motion detection.

The search information is input from the input unit 214 to the search processing unit 207 via the control unit 215.
The search processing unit 207 performs search processing using the first video data 210 after decoding based on the search information. The search processing unit 207 records the search result in the memory 216. Specifically, the search result including the shooting time of the image (video frame) that matches the search condition and the identification information of the shooting camera is recorded in the memory 216. In addition, a video frame that matches the search condition may be recorded in the memory 216. When the search process within the search range is completed, the search processing unit 207 notifies the control unit 215 of search process completion information indicating that the search process has been completed.

The control unit 215 controls the switch 217, the switch 218, the switch 219, and the switch 220 based on the search information and the search process completion information.
The control unit 215 connects the terminal 1 and the terminal 2 of the switch 217 based on the search start instruction of the search information, and searches for the first search for matching the “search range” recorded in the first recording unit 204. The video stream 202 is input to the decoding unit 209.
The control unit 215 connects the terminal 1 and the terminal 2 of the switch 218 based on the search start instruction for the search information, starts the operation of the search processing unit 207, and stores the first video data 210 after decoding as the search processing unit 207. Enter.
Based on the search information search start instruction, the control unit 215 connects the terminal 1 and the terminal 2 of the switch 219 and inputs the search information input from the input unit 214 to the output unit 213.
Based on the search start instruction of the search information, the control unit 215 connects the terminal 1 and the terminal 2 of the switch 220, stops the operation of the image processing unit 208, and outputs the decoded second video data 211 to the image processing unit 208. Is input to the output unit 213 without going through.

Based on the search processing completion information, the control unit 215 opens the terminals 1 and 2 of the switch 217 and does not input the first video stream 202 for search to the decoding unit 209.
Based on the search processing completion information, the control unit 215 opens the terminals 1 and 2 of the switch 218, stops the operation of the search processing unit 207, and inputs the first video data 210 after decoding to the search processing unit 207. do not do.
The control unit 215 connects the terminal 1 and the terminal 3 of the switch 220 based on the search processing completion information, starts the operation of the image processing unit 208, and inputs the decoded second video data 211 to the image processing unit 208. To do.
Although not shown, the control unit 215 controls each unit of the video recording / reproducing device 102.

  The output unit 213 combines the data 212 decoded by the decoding unit 209 and subjected to the image correction processing by the image processing unit 208 and the operation screen such as search information input from the input unit 214, and connected monitors, etc. Display image data is output to Alternatively, the decoded second video data 211 that has been decoded by the decoding unit 209 and has not been subjected to image correction processing and the search information input operation screen input from the input unit 213 are combined and displayed on a connected monitor or the like. Output image data.

  FIG. 4 is a block diagram showing a hardware configuration of the video recording / playback apparatus 102 according to the first embodiment of the present invention. The video recording / reproducing device 102 includes a receiving device 401, an output device 402, an HDD 403, an input device 404, a processing circuit 405, and a memory 406. The HDD 403 may be configured integrally with the video recording / reproducing device 102 or may be configured as a separate device. Specific examples of the input device 404 include a mouse, a keyboard, a microphone, and a remote controller. Further, even if the processing circuit 405 is dedicated hardware, a CPU (Central Processing Unit, a central processing unit, a processing unit, a processing unit, a microprocessor, a microcomputer, a processor, a DSP (DSP) that executes a program stored in a memory It may also be referred to as Digital Signal Processor).

  The receiving unit 201 in FIG. 2 is realized by the receiving device 401 in FIG. The first recording unit 204 and the second recording unit 205 in FIG. 2 are realized by the memory 406 in FIG. The processing unit 206, the search processing unit 207, the image processing unit 208, the decoding unit 209, the control unit 215, the switch 217, the switch 218, the switch 219, and the switch 220 in FIG. 2 are realized by the processing circuit 405 in FIG. The input unit 214 in FIG. 2 is realized by the input device 404 in FIG. The memory 216 in FIG. 2 is realized by the memory 406 in FIG. The output unit 213 in FIG. 2 is realized by the output device 402 in FIG.

Next, the operation will be described. FIG. 5 is an operation flowchart according to the first embodiment of the present invention.
In step ST501, control unit 215 determines whether or not the search process has been started based on the search information input from input unit 214. When determining that it has started, the mobile terminal makes a transition to step ST502. When it determines that it has not started, it transfers to step ST512. When there is input of search information, specifically, a search start instruction from the input unit 214, it is determined that the search process has started. In addition, when there is no input of search information, specifically, a search start instruction, it is determined that the search process has not been started.

In step ST502, control unit 215 stops the operation of image processing unit 208. Alternatively, the image correction processing of the image processing unit 208 is stopped. Further, the terminal 1 and the terminal 2 of the switch 220 are connected, and the decoded second video data 211 is input to the output unit 213 without passing through the image processing unit 208. That is, the second video data 211 after decoding is input to the output unit 213 without performing image correction processing for making the image look better, such as super-resolution processing. As a result, a real-time (current) captured image can be displayed even during search processing.
In step ST503, control unit 215 starts operation of search processing unit 207. Alternatively, the search processing of the search processing unit 207 is started.
Note that step ST502 and step ST503 may be performed simultaneously.

In step ST504, the control unit 215 connects the terminal 1 and the terminal 2 of the switch 217, and reads the first video stream 202 for search that matches the “search range” recorded in the first recording unit 204. , Input to the decoding unit 209.
In step ST505, the decoding unit 209 decodes the search first video stream 202 input in step ST504, and outputs the decoded first video data 210.
In step ST506, control unit 215 connects terminal 1 and terminal 2 of switch 218, and inputs decoded first video data 210 to search processing unit 207.

In step ST507, search processing section 207 executes search processing. In step ST501, search processing is executed based on the search information input from input unit 214. For example, a search is performed for the presence or absence of a video frame that matches the extracted image condition in a video frame shot by a specified shooting camera in a specified search target period that is a search range. When the condition of the extracted image is that the video frame with motion detection is extracted, the video frame with motion detection is extracted from the video frames shot by the specified shooting camera in the specified search target period. To do. As a specific example of a method for extracting a video frame with motion detection, the search processing unit 207 performs motion based on a comparison result between a difference between a video frame to be determined and the previous video frame and a predetermined threshold. Determine the presence or absence.
In step ST508, search processing section 207 records the search result in memory 216. For example, the shooting time of the video frame that matches the extracted image condition, the identification information of the shooting camera, and the matched video frame are recorded in the memory 216.

  In step ST509, search processing section 207 determines whether or not the search processing has been completed. In step ST501, it is determined whether or not the search processing of the search range input from input unit 214 has been completed. If it is determined that the search process is completed, search process completion information indicating that the search process is completed is notified to the control unit 215, and the process proceeds to step ST510. If it is determined that the search process has not been completed, the process returns to step ST504. When the search information, specifically, the search end time is input from the input unit 214, when the video frame search process up to the search end time is completed, it is determined that the search process is completed. If the video frame search process up to the search end time is not completed, it is determined that the search process is not completed.

In step ST510, control unit 215 stops the operation of search processing unit 207. Alternatively, the search processing of the search processing unit 207 is stopped. Further, the terminal 1 and the terminal 2 of the switch 217 are opened, and the first video stream 202 for search is not input to the decoding unit 209. The terminals 1 and 2 of the switch 218 are opened, and the first video data 210 after decoding is not input to the search processing unit 207.
In step ST511, control unit 215 starts the operation of image processing unit 208. Alternatively, the image correction processing of the image processing unit 208 is started. Terminals 1 and 3 of the switch 220 are connected, and the decoded second video data 211 is input to the image processing unit 208. That is, data 212 after image correction processing for better displaying an image such as super-resolution processing is input to the output unit 213.
Note that step ST510 and step ST511 may be performed simultaneously.

In step 512, the control unit 215 performs or continues the operation of the image processing unit 208. Alternatively, the image correction processing of the image processing unit 208 is performed or continued. The connection between the terminal 1 and the terminal 3 of the switch 220 is continued, and the decoded second video data 211 is input to the image processing unit 208. That is, data 212 after image correction processing for better displaying an image such as super-resolution processing is input to the output unit 213.
You may return to step ST501 after the process of step ST511 or the process of step ST512.

FIG. 6 is a display example of the main screen of the monitor connected to the output unit 213 according to Embodiment 1 of the present invention.
The output unit 213 combines the data 212 after the image correction processing of the second video stream 203 for reproduction and the operation screen from the input unit 214 and outputs the display image data to a connected monitor or the like. Alternatively, a monitor connected by synthesizing the decoded second video data 211 and the operation screen from the input unit 213, which are decoded by the decoding unit 209 of the second video stream 203 for reproduction and the image correction processing is not performed. Display image data is output to

The main screen includes a video display area 601. The operation screen from the input unit 213 includes, for example, a search start time specifying area 602 for specifying a search target period, a search end time specifying area 603, and a camera selection button 604 for specifying a photographing camera. When the camera selection button 604 is pressed, for example, the screen shifts to the camera selection screen in FIG. On the camera selection screen, a photographing camera is selected as a search range. The camera selection screen includes a video display area 701, a camera selection button 702, a camera name display area 703, an enter button 704, and a cancel button 705. With reference to the camera name display area 703, a photographing camera is selected as a search range, a camera selection button 702 is checked, and a decision button 704 is pressed. By pressing the enter button 704, the camera selection screen is closed and the screen returns to the main screen. On the main screen, the camera selected by the camera selection button 702 is displayed in a shooting camera selection result display area 607 having a camera selection result button 605 and a camera name display area 606. In the current time display area 608, the current time or the shooting time of the video frame displayed in the reproduction image display area 609 is displayed. In the playback image display area 609, data 212 after the image correction processing of the second video stream 203 for playback is displayed while the search processing unit 207 is stopped, and playback is performed while the search processing unit 207 is processing. The second video data 211 after decoding, which has not been subjected to the image correction processing of the second video stream 203, is displayed. The image quality differs between the data 212 after image correction processing and the second video data 211 after decoding. In order to alleviate the user's uncomfortable feeling, the decoded second video data 211 is displayed in the playback image display area 609. While the search processing unit 207 is performing the search process, the fact that “searching is in progress” is displayed in the video display area 601. It is good to display.

  As described above, according to the first embodiment, it is possible to realize video search without using an external processing device and without increasing the processing capability of the recorder. As a result, it is possible to obtain the effects of suppressing the operation cost of the video monitoring system and reducing the installation space of another device. In addition, since it is not necessary to record the recorded video on the external processing device again, it is possible to reduce points to consider regarding security.

Embodiment 2. FIG.
The second embodiment discloses the search result output method of the first embodiment.
The configuration diagram of the entire video monitoring system including the video recording / playback apparatus according to the second embodiment of the present invention is the same as that of the first embodiment, and a description thereof will be omitted.

The functional configuration diagram of the video recording / reproducing apparatus 102 according to the second embodiment of the present invention is the same as that of the first embodiment. Functions added in the second embodiment will be described with reference to FIG.
When the search process is completed, the search processing unit 207 notifies the control unit 215 of search process completion information indicating that the search process is completed, and performs a thumbnail display process. Specifically, an image (video frame) that matches the search condition is input to the output unit 213. When video frames are recorded in the memory 216, the search processing unit 207 may input video frames that match the search conditions recorded in the memory 216 to the output unit 213. If no video frame is recorded in the memory 216, the video frame corresponding to the imaging time of the video frame that matches the search conditions recorded in the memory 216 and the identification information of the imaging camera is retrieved from the first recording unit 204. Reading and decoding by the decoding unit 209, the decoded first video data 210 is input to the output unit 213.

The input unit 214 accepts a user operation for inputting search result reproduction information. Specific examples of the search result reproduction information include a search result reproduction start instruction, search result reproduction image information (such as the shooting time of an image (video frame) that matches the search condition, identification information of the shooting camera, and the like).
The search result reproduction information is input to the image processing unit 208 via the control unit 215, and the search result reproduction process is performed.
Based on the search result reproduction information, the image processing unit 208 captures a video frame corresponding to the shooting time of an image (video frame) that matches the search condition, identification information of the shooting camera, or a video frame continuous from the corresponding video frame. Is decoded from the second recording unit 205, decoded by the decoding unit 209, and subjected to image correction processing for better displaying the image such as super-resolution processing on the second video data 211 after decoding. Then, the second video data 212 is input to the output unit 213.

The control unit 215 connects the terminal 1 and the terminal 2 of the switch 217 based on the search processing completion information, and inputs a video frame recorded in the first recording unit 204 that matches the search condition to the decoding unit 209. .
The control unit 215 connects the terminal 1 and the terminal 2 of the switch 218 based on the search processing completion information, and inputs the decoded first video data 210 to the search processing unit 207.
The control unit 215 connects the terminal 1 and the terminal 2 of the switch 219 based on the search processing completion information, and outputs to the output unit 213 a video frame that matches the search condition read from the memory 216 or the first recording unit 204. input.
Based on the search processing completion information, the control unit 215 connects the terminal 1 and the terminal 2 of the switch 220, stops the operation of the image processing unit 208, and sends the decoded second video data 211 via the image processing unit 208. Without being input to the output unit 213.

Based on the search result reproduction information, the control unit 215 opens the terminals 1 and 2 of the switch 217 and does not input the first video stream 202 for search to the decoding unit 209.
Based on the search result reproduction information, the control unit 215 opens the terminals 1 and 2 of the switch 218, stops the operation of the search processing unit 207, and inputs the decoded first video data 210 to the search processing unit 207. do not do.
Based on the search result reproduction information, the control unit 215 connects the terminal 1 and the terminal 3 of the switch 220, starts the operation of the image processing unit 208, and captures and captures the image (video frame) that matches the search condition. Image correction for reading a video frame corresponding to camera identification information or continuously from the corresponding video frame from the second recording unit 205 and decoding it by the decoding unit 209 to make the image such as super-resolution processing look better Processing is performed, and the second video data 212 after image processing is input to the output unit 213.

During the thumbnail display process, the output unit 213 synthesizes a thumbnail image that is an image (video frame) that matches the search condition input from the search processing unit 207 and an operation screen such as search information input from the input unit 214. Then, display image data is output to a connected monitor or the like. Alternatively, the thumbnail image is decoded by the operation screen and the decoding unit 209, and the decoded second video data 211 which has not been subjected to the image correction process is synthesized, and the display image data is output to a connected monitor or the like.
Further, during the search result reproduction process, the output unit 213 decodes the video frame that matches the search condition or the data continuous from the corresponding video frame by the decoding unit 209 and performs the image correction processing by the image processing unit 208. Data 212 and an operation screen such as search information input from the input unit 214 are combined, and display image data is output to a connected monitor or the like. Alternatively, the search result reproduction image, the operation screen, and the decoding unit 209 decode the image correction processing and the second video data 211 after decoding, and outputs the display image data to a connected monitor or the like.

  Since the block diagram showing the hardware configuration of the video recording / reproducing apparatus 102 according to the second embodiment of the present invention is the same as that of the first embodiment, the description thereof will be omitted.

Next, the operation will be described. FIG. 8 is an operation flowchart according to the second embodiment of the present invention. When it is determined in step ST509 in FIG. 5 that the search process has been completed, the process in FIG. 8 is started.
In step ST801, search processing section 207 executes thumbnail display processing. Specifically, an image (video frame) that matches the search condition is input to the output unit 213. If a video frame is recorded in the memory 216 in step ST508, the search processing unit 207 may input a video frame that matches the search condition from the memory 216 to the output unit 213. If no video frame is recorded in the memory 216 in step ST508, the video frame corresponding to the shooting time of the video frame matching the search condition and the identification information of the shooting camera is read from the first recording unit 204 and decoded. Decoded by the unit 209, the first video data 210 after decoding is input to the output unit 213. In step ST502, the control unit 215 stops the operation of the image processing unit 208, connects the terminal 1 and the terminal 2 of the switch 220, and passes the decoded second video data 211 through the image processing unit 208. Without being input to the output unit 213. That is, the second video data 211 after decoding is input to the output unit 213 without performing image correction processing for making the image look better, such as super-resolution processing. Even during thumbnail display processing, real-time (current) captured images can be displayed.

  In step ST802, control unit 215 determines whether or not search result reproduction processing has been started based on search result reproduction information input from input unit 214. When determining that it has started, the mobile terminal makes a transition to step ST803. If it is determined that the process has not been started, the process of step ST802 is repeated. If there is input of search result playback information, specifically, a search result playback instruction, from the input unit 214, it is determined that the search result playback processing has started. Also, if there is no input of search result playback information, specifically, a search result playback instruction, it is determined that the search result playback processing has not been started.

In step ST803, control unit 215 stops the operation of search processing unit 207. Further, the terminal 1 and the terminal 2 of the switch 217 are opened, and the first video stream 202 for search is not input to the decoding unit 209. The terminals 1 and 2 of the switch 218 are opened, and the first video data 210 after decoding is not input to the search processing unit 207.
In step ST804, control unit 215 starts the operation of image processing unit 208 and executes search result reproduction processing. The terminal 1 and the terminal 3 of the switch 220 are connected, and based on the search result playback information input from the input unit 214, a video frame that matches the search result playback image information or a video frame continuous from the corresponding video frame The second video data 212 is read from the second recording unit 205, decoded by the decoding unit 209, and subjected to image correction processing such as super-resolution processing to make the image look better, and the second video data 212 after image processing is input to the output unit 213 .
Note that step ST803 and step ST804 may be performed simultaneously.

  In step ST804, control unit 215 may connect terminal 1 and terminal 2 in addition to connection of terminal 1 and terminal 3 of switch 220. The second video data 211 after decoding is input to the output unit 213 without passing through the image processing unit 208. That is, the second video data 211 after decoding is input to the output unit 213 without performing image correction processing for making the image look better, such as super-resolution processing. Even during the search result reproduction process, a real-time (current) captured image can be displayed.

FIG. 9 is a display example of a thumbnail display screen of a monitor connected to the output unit 213 according to Embodiment 2 of the present invention.
The output unit 213 outputs display image data to a monitor or the like to which a thumbnail image that is an image (video frame) that matches the search condition is connected. Alternatively, the thumbnail image and the decoded second video data 211 decoded by the decoding unit 209 and not subjected to image correction processing are combined, and the display image data is output to a connected monitor or the like.

The thumbnail display screen includes a video display area 901. The video display area 901 has a thumbnail display area 902. In the time display area 903, the shooting time of the video frame that matches the search condition recorded in the memory 216 is displayed. The video display area 904 displays an image (video frame) taken at the shooting time displayed in the time display area 903. When a video frame is recorded in the memory 216, the video frame recorded in the memory 216 is displayed. If no video frame is recorded in the memory 216, the video frame corresponding to the shooting time of the video frame that matches the search condition (the shooting time displayed in the time display area 903) and the identification information of the shooting camera is the first. The data is read from the recording unit 204, decoded by the decoding unit 209, and the first video data 210 after decoding is displayed.
The display in the time display area 903 and the video display area 904 is performed for all the video frame shooting times that match the search conditions stored in the memory 216. If the thumbnail cannot be displayed in the thumbnail display area 902, it is confirmed by operating the scroll button 905.

In step ST802 of FIG. 8, the user selects an arbitrary video frame from video frames that match the search condition displayed in the video display area 904. After selecting an arbitrary video frame, the playback button 906 is pressed. For example, selection of a video frame by the user or pressing of the playback button 906 is a search result playback instruction.
Selection of a video frame by the user or pressing of the play button 906 can be invalidated or interrupted by a cancel button 907.

  As described above, according to the second embodiment, the video search result can be displayed and reproduced without using an external processing device and without increasing the processing capability of the recorder. As a result, it is possible to obtain the effects of suppressing the operation cost of the video monitoring system and reducing the installation space of another device. In addition, since it is not necessary to record the recorded video on the external processing device again, it is possible to reduce points to consider regarding security.

  101 camera, 102 video recording / playback apparatus, 104 monitor, 201 receiving unit, 202 first video stream for search, 203 second video stream for playback, 206 processing unit, 207 search processing unit, 208 image processing unit, 209 decoding unit, 210 first video data after decoding, 211 second video data after decoding, 213 output unit, 214 input unit.

Claims (7)

In a video recording / playback device connected to a camera,
A receiving unit that receives a first video stream for search and a second video stream for playback from the camera;
A decoding unit for decoding the first video stream for search into first video data after decoding, and decoding the second video stream for reproduction into second video data after decoding;
An input unit that accepts search conditions;
A search processing unit that performs a search process for searching for a video frame that matches the search condition using the first video data after decoding, and an image that performs an image correction process using the second video data after decoding A processing unit including a processing unit,
The video recording / reproducing apparatus that performs either one of the search processing in the search processing unit and the image correction processing in the image processing unit in the processing unit. 2. The video recording / reproducing apparatus according to claim 1, wherein the second video stream for reproduction has higher image quality than the first video stream for retrieval. An output unit for outputting display image data to a connected monitor;
The output unit outputs the second video data after decoding that is not subjected to the image correction processing in the image processing unit as the current photographed image to the monitor as the current photographed image while the search processing unit performs the search processing. 3. The video recording / reproducing apparatus according to claim 1, wherein the video recording / reproducing apparatus outputs the video. The search processing unit performs a thumbnail display process of inputting a video frame that matches the search condition to the output unit,
The said processing part implements any one of the said thumbnail display process in the said search process part, and the said image correction process in the said image processing part, The Claim 1 thru | or 3 characterized by the above-mentioned. The video recording / reproducing apparatus as described. An output unit for outputting display image data to a connected monitor;
While the search processing unit is performing thumbnail display processing, the output unit outputs the second video data after decoding that is not subjected to the image correction processing in the image processing unit as the current captured image to the monitor. 5. The video recording / reproducing apparatus according to claim 4, wherein the video recording / reproducing apparatus outputs the video. The input unit accepts search result reproduction information,
The image processing unit performs search result reproduction processing based on the search result reproduction information,
The said processing part implements any one of the said search result reproduction | regeneration processing in the said image processing part, and the process in the said search processing part, The Claim 1 thru | or 5 characterized by the above-mentioned. Video recording and playback device. An output unit for outputting display image data to a connected monitor;
The output unit outputs the second video data after decoding that is not subjected to the image correction processing in the image processing unit as a current captured image while the image processing unit is executing the search result reproduction processing. 7. The video recording / reproducing apparatus according to claim 6, wherein the video recording / reproducing apparatus outputs to the monitor.

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