JP2006279646A - Monitor video processor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a monitor video processor capable of reproducing a monitor video in real-time, including a video which is taken-in by a timing which is not an original operation timing. <P>SOLUTION: The monitor video processor photographs the monitor video, which is photographed with camera 12, by prescribed photographing cycle, and written in an SDRAM 28. When a sensor 22 detects an abnormality, a CPU 20 changes the operation timing for photographing the monitor video in the case of issuing alarm. The changed operation timing is specified based on a sound recording time and the photographing cycle. Then the monitor video recorded in the SDRAM 28 is reproduced by the cycle being the same as the photographing cycle. In this case, the monitor video photographed when the alarm is issued is reproduced by the changed operation timing. Consequently, the operation timing for photographing the monitor video in the case of issuing the alarm is specified, so that the monitor video including the video photographed by the timing which is not the original operation timing is reproduced in real-time. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a monitoring video processing apparatus, and more particularly to a monitoring video processing apparatus that is applied to, for example, a monitoring camera and reproduces a monitoring video in real time.

The conventional surveillance video device disclosed in Patent Document 1 records and records the audio that is continuously input and the surveillance video that is intermittently input at a predetermined time interval, in association with each other. Play the surveillance video synchronized with the audio.
JP-A-9-247607 [H04N 5/7826, G05B 19/05, G11B 20/10, H04N 5/91]

  However, when monitoring video is recorded intermittently at a predetermined time interval, there is a problem that monitoring video including video captured at a timing other than the original operation timing due to the occurrence of an alarm cannot be reproduced in real time. is there.

  SUMMARY OF THE INVENTION Therefore, a main object of the present invention is to provide a monitoring video processing apparatus capable of reproducing in real time a monitoring video including a video captured at a timing other than the original operation timing.

  According to the first aspect of the present invention, the first capturing means (12, 20, S7, S9, S23, S25) for capturing the monitoring video at a predetermined period, and the first recording for recording the plurality of monitoring videos captured by the first capturing means. Means (20, 28, S11, S27), first changing means (20, S5, S15) for changing the operation timing of the first capturing means in response to the occurrence of an alarm, the operating period and the predetermined period of the first capturing means Based on the above, a specifying means (20, S33 to S37) for specifying the operation timing changed by the first changing means, and a first reproducing means for reproducing a plurality of monitoring videos recorded by the first recording means at a predetermined cycle ( 20, 42, S59, S71) and the operation timing of the first reproduction means for the monitoring video captured in response to the occurrence of the alarm is specified by the specifying means. A second changing means for changing the operation timing (20, S63, S67), a surveillance image processor.

  According to the first aspect of the present invention, the monitoring video is captured at a predetermined cycle by the first capturing means. The plurality of captured video images are recorded by the first recording means. However, the operation timing of the first capturing means is changed by the first changing means when an alarm occurs. The change in the operation timing is specified by the specifying unit based on the operation period of the first capturing unit and the predetermined cycle.

  The plurality of monitoring videos recorded by the first recording unit are reproduced by the first reproducing unit at a predetermined cycle. The second changing means changes the operation timing of the first reproducing means for the monitoring video captured by the first capturing means in response to the occurrence of the alarm to the operation timing specified by the specifying means.

  In this way, the operation timing of the first changing means is specified by the specifying means, and the reproduction timing of the first reproducing means is changed to the specified operation timing, so that it is captured at a timing that is not the original operation timing due to the occurrence of an alarm. The monitoring video including the recorded video can be reproduced in real time.

  According to a second aspect of the present invention, in the monitoring video device according to the first aspect, the second capturing means (16, 20, S3) for capturing audio in parallel with the capturing operation of the first capturing means is further provided. Size detection means (20, S33, S35) for detecting the size of the voice captured by the second capture means for specifying the operation period is included.

  According to the second aspect of the present invention, the audio is captured by the second capturing unit in parallel with the capturing operation of the monitoring video by the first capturing unit. Next, the size of the captured sound is detected by the size detecting means, and the operation period of the first capturing means is obtained. In this case, the changed operation timing is specified based on the obtained audio size and the predetermined period, and the monitoring video captured in response to the occurrence of the alarm is reproduced at the specified operation timing. Monitoring video including video captured at a timing other than the recording timing can be reproduced in real time.

  A third aspect of the present invention is the surveillance video recording apparatus according to the second aspect, further comprising second recording means (20, 28, S13, S29) for recording the sound captured by the second capturing means.

  In the invention of claim 3, the sound taken in by the second take-in means is recorded by the second recording means. In this case, sound can also be played back when the monitoring video is played back.

  According to a fourth aspect of the present invention, in the surveillance video recording apparatus according to the second or third aspect, the size detection means corresponds to the surveillance video captured in response to the occurrence of the alarm and the surveillance video captured after the occurrence of the alarm. Alarm size detecting means (20, S35) for detecting the size of the sound is included, and the specifying means specifies the alarm timing for specifying the operation timing changed based on the size of the sound detected by the alarm size detecting means and the predetermined period. Means (20, S37), and the second changing means changes the operation timing of the first reproduction means for the monitoring video captured in response to the occurrence of the alarm to the operation timing specified by the alarm specifying means. Means (20, S63).

  In the invention of claim 4, the size of the audio corresponding to the monitoring video captured in response to the occurrence of the alarm and the monitoring video captured after the occurrence of the alarm is detected by the alarm size detecting means. Based on the sound size detected by the alarm size detecting means and the predetermined period, the alarm specifying means specifies the operation timing of the first capturing means when the monitoring video is captured in response to the occurrence of the alarm. Then, the operation timing of the first reproducing means for the monitoring video captured in response to the occurrence of the alarm is changed to the operation timing specified by the alarm specifying means. In this case, the size of the recorded sound is detected by utilizing the fact that the recording speed of the sound is always constant, and the reproduction timing of the first reproducing means is changed, so that it is captured at a timing other than the original operation timing. Surveillance video including recorded video can be played back in real time.

  According to a fifth aspect of the present invention, in the monitoring video recording apparatus according to the third or fourth aspect, the first capturing means includes pre-alarm video capturing means (12, 20, S7, S9) for capturing the monitoring video before the occurrence of the alarm. The first recording means includes pre-alarm video recording means (20, 28, S11) for cyclically recording the monitoring video captured by the pre-alarm video capturing means, and the second capturing means is a sound before the alarm is generated. Pre-alarm audio capturing means (16, 20, S3) that captures the pre-alarm sound recording means (20, 28, S13) for cyclically recording the sound captured by the pre-alarm sound capturing means. )including.

  In the invention of claim 5, the pre-alarm video capturing means captures the monitoring video before the alarm is generated, and the monitoring video captured by the pre-alarm video capturing means is recorded cyclically by the first recording means. In addition, the pre-alarm sound capturing means captures the sound before the alarm occurrence, and the second recording means cyclically records the sound captured by the pre-alarm sound capturing means. In this case, the monitoring video and sound before the alarm can be recorded cyclically, so even if it takes a long time from the start of recording until the alarm occurs, Audio can be recorded.

  A sixth aspect of the present invention is the surveillance video device according to any one of the third to fifth aspects, further comprising second reproduction means (20, S53) for reproducing the sound recorded by the second recording means.

  According to the sixth aspect of the present invention, the sound recorded by the second recording means is reproduced by the second reproducing means. In this case, it is possible to simultaneously reproduce the monitoring video and audio.

  According to the present invention, the operation timing of the first changing means is specified by the specifying means, and the reproduction timing of the first reproducing means is changed to the specified operation timing, so that it is captured at a timing that is not the original operation timing. Monitoring video including video can be played back in real time.

  The above object, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

  With reference to FIG. 1, the monitoring camera system 10 of this embodiment includes a camera 12. The camera 12 shoots the scene in accordance with a shooting command given from the CPU 20 at every shooting period registered in the SDRAM 28 in advance, and outputs a video signal of the shot scene to the signal processing circuit 14. Here, the shooting period of the camera is always constant, but when an alarm is generated as described later, it may be different before and after the alarm is generated. However, even in this case, the imaging cycle is constant before and after the occurrence of the alarm.

  The signal processing circuit 14 captures a given video signal and converts the captured video signal into video data that is a digital signal. Next, the signal processing circuit 14 performs processing such as color separation, white balance adjustment, and YUV conversion on the converted video data, and outputs the video data to the memory control circuit 26 together with the write request. The memory control circuit 26 writes the given video data into the SDRAM 28 in response to the write request.

  The CPU 20 generates a video compression command and an audio processing command for each shooting period in order to compress video data and capture an audio signal. The video compression command is given to the JPEG codec 30, and the audio processing command is given to the signal processing circuit 18.

  The JPEG codec 30 outputs a read request to the memory control circuit 26 in accordance with the video compression command. The memory control circuit 26 reads the video data written in the SDRAM 28 in response to the read request. The read video data is given to the JPEG codec 30 via the bus 38 and compressed by the JPEG method. Each time the JPEG codec 30 generates compressed video data, the JPEG codec 30 requests the memory control circuit 26 to write the generated compressed video data, and the memory control circuit 26 writes the compressed video data to the SDRAM 28 in response to the request.

  On the other hand, the signal processing circuit 18 captures an audio signal from the microphone 16 in response to the audio processing command, converts the acquired audio signal into audio data that is a digital signal by A / D conversion, and then the signal processing circuit 18 Data is written in the buffer memory 18a provided inside. The CPU 20 gives a transfer command to the signal processing circuit 18 in order to transfer the audio data written in the buffer memory 18 a to the SDRAM 28 at the timing when the camera 12 captures the scene. When the transfer command is given to the signal processing circuit 18, the audio data is transferred from the buffer memory 18a to the SDRAM 28 and written therein.

  When the compression of the video data is completed, the CPU 20 gives a recording command of the compressed video data and the audio data to the hard disk 36 to the HDD-I / F 32. The HDD-I / F 32 outputs a read request for compressed video data and audio data to the memory control circuit 26 in accordance with the recording command. The memory control circuit 26 reads the compressed video data and audio data from the SDRAM 28 in response to the read request, and outputs the read compressed video data and audio data to the HDD-I / F 32 via the bus 38. The HDD-I / F 32 records the given compressed video data and audio data on the hard disk 36 via the HDD 34.

  Next, a case where the compressed video data recorded on the hard disk 36 is reproduced will be described. The CPU 20 instructs the HDD-I / F 32 to read out the compressed video data and audio data recorded on the hard disk 36. The HDD-I / F 32 reads the compressed video data and audio data recorded in the hard disk 36 via the HDD 34 and outputs the read compressed video data and audio data to the memory control circuit 26 together with a write request. The memory control circuit 26 writes the compressed video data and audio data given in response to the write request to the SDRAM 28.

  The CPU 20 gives a video decompression command to the JPEG codec 30 for each reproduction cycle in order to decompress the compressed video data. The JPEG codec 30 outputs a read request to the memory control circuit 26 in accordance with the video decompression command. The memory control circuit 26 reads the compressed video data written in the SDRAM 28 in response to the read request. The read compressed video data is given to the JPEG codec 30 via the bus 38, and the given compressed video data is expanded by the JPEG method. Each time the decompressed video data is generated, the JPEG codec 30 requests the memory control circuit 26 to write the generated decompressed video data, and the memory control circuit 26 writes the decompressed video data to the SDRAM 28 in response to the request. .

  The CPU 20 gives a video reproduction command to the video encoder 40 in order to reproduce the decompressed video data. The video encoder 40 outputs a read request to the memory control circuit 26 in accordance with the video reproduction command. The memory control circuit 26 reads the decompressed video data written in the SDRAM 28 in response to the read request, and outputs the read decompressed video data to the video encoder 40. The video encoder 40 converts the given expanded video data into a composite video signal, and outputs the converted composite video signal to the monitor 42. As a result, an image of the scene is displayed on the monitor 42.

  The CPU 20 also gives an audio reproduction command to the signal processing circuit 44 in order to reproduce audio data. The signal processing circuit 44 outputs a read request to the memory control circuit 26 in response to the sound reproduction command. The memory control circuit 26 reads audio data from the SDRAM 28 in response to the read request, and outputs the read audio data to the signal processing circuit 44. The signal processing circuit 44 performs predetermined reproduction processing on the given audio data and outputs the audio signal subjected to the reproduction processing to the speaker 46. As a result, sound is reproduced from the speaker 46.

  In this monitoring camera system 10, when an abnormality is detected by the sensor 22, the CPU 20 generates an alarm. Therefore, video that was captured before the alarm occurred is defined as “pre-alarm video”, video that was captured when the alarm occurred is defined as “alarm video”, and video that was captured after the alarm occurs is defined as “post-alarm video”. The sound to be defined is defined as “pre-alarm sound”, “alarm sound”, and “post-alarm sound”.

  As shown in FIG. 2, in the SDRAM 28, a pre-alarm video area 28a, a post-alarm video area 28b, a pre-alarm audio area 28c, a post-alarm audio area 28d, a video shooting / playback period, a set number of shots, and the like are registered. And a display video area (not shown) in which video data before compression / video data after decompression are temporarily written are provided.

  Both the pre-alarm video area 28a and the post-alarm video area 28b are divided into a plurality of storage areas. In each storage area of the pre-alarm video area 28a, compressed video data of each pre-alarm video is written. The compressed video data of the alarm video and the compressed video data of each post-alarm video are written in each storage area of the post-alarm video area 28b. Pre-alarm audio data is written in the pre-alarm audio area 28c, and alarm audio data and post-alarm audio data are written in the post-alarm audio area 28d.

  In the pre-alarm video area 28a, a sufficient number of storage areas, for example, 50 storage areas for writing compressed pre-alarm video data are prepared, and in order to write pre-alarm audio data in the pre-alarm audio area 28c. Sufficient capacity is prepared. Both the pre-alarm video area 28a and the pre-alarm audio area 28c operate as a ring buffer. Therefore, the compressed pre-alarm video data and pre-alarm audio data are updated in a ring shape, that is, cyclically in the pre-alarm video area 28a and the pre-alarm audio area 28c, respectively. Therefore, it is possible to write in the SDRAM 28 the compressed pre-alarm video data whose number exceeds the number of storage areas of the pre-alarm video area 28a and the pre-alarm audio data exceeding the capacity of the pre-alarm audio area 28c.

  Further, eight storage areas are prepared in the post alarm video area 28b for writing one alarm video data and a set number, for example, seven post alarm video data. The post-alarm audio area 28d has a capacity for writing alarm audio data corresponding to the alarm video data and post-alarm audio data corresponding to the set number of post-alarm video data.

  With reference to FIG. 3, the relationship between audio recording and shooting timing of the object scene will be described. When the monitoring camera system 10 is activated, the sound continuously captured from the microphone 16 is converted into the sound data A1 by the signal processing circuit 18, and the converted sound data A1 is sequentially written in the buffer memory 18a. When the CPU 20 detects the pre-alarm video shooting timing by comparing the pre-alarm video shooting period registered in the management area 28e with the measurement value of the timer 24, the CPU 20 instructs the camera 12 to shoot the object scene. To do. The pre-alarm video imaged by the camera 12 is converted into video data V1, and then written in the storage area of the pre-alarm video area 28a. At this time, the audio data A1 written in the buffer memory 18a is transferred to and written in the pre-alarm audio area 28c, and the buffer memory 18a is reset.

  Similarly, when the CPU 20 detects that it is the pre-alarm video shooting timing when the next audio data A2 is written in the buffer memory 18a, it instructs the camera 12 to take a picture of the object scene again. The video data V2 of the photographed pre-alarm video is written in the storage area next to the pre-alarm video area 28a. At this time, the audio data A2 written in the buffer memory 18a is transferred to and written in the pre-alarm audio area 28c, and the buffer memory 18a is reset. Similarly, video data V3, V4... And audio data A3, A4... Are sequentially written in the pre-alarm video area 28a and the pre-alarm audio area 28c for each pre-alarm video shooting period. Since the pre-alarm video area 28a and the pre-alarm audio area 28c operate as ring buffers as described above, even if pre-alarm video data and pre-alarm audio data exceeding the capacity are given, they are overwritten. Can be written.

  When an abnormality is detected by the sensor 22, the CPU 20 generates an alarm, and at the same time, instructs the camera 12 to shoot a scene regardless of whether or not the pre-alarm video is captured, and posts the captured video data V5. Write to the storage area at the beginning of the alarm video area 28b. At this time, the audio data written in the buffer memory 18a is simultaneously transferred to the post-alarm audio area 28d and sequentially written from the head address of the post-alarm audio area 28d. Thereafter, the post-alarm video is captured for the set number of images registered in advance in the management area 28e, and the captured video data V6 to V12 are respectively written in the storage areas of the post-alarm video area 28b. At this time, the recorded post-alarm audio data A6 to A12 are similarly written in the post-alarm audio area 28d.

  Next, a method for specifying the time (alarm time) from the shooting of the immediately preceding pre-alarm video to the shooting of the alarm video when an alarm occurs when it is not the shooting timing of the object scene will be described. For example, in the management area 28e, the post-alarm video shooting cycle is registered as 0.5 seconds, the number of video shots that can be recorded in the post-alarm video area 28b is 8, and the recording rate of audio data is 8 kB / second. In this case, the alarm time can be obtained as follows.

  First, when it is assumed that the alarm video was also shot after 0.5 seconds have passed in the same manner as the post-alarm video shooting period, the recording time Z from the audio data A5 to A12 is recorded in the post-alarm video area 28b. Obtained from the number of images taken. In this case, since the number of images recorded in the post-alarm video area 28b is 8 in total, that is, one alarm video and seven post-alarm images, the recording time Z from the audio data A5 to A12 is as follows. It becomes like this.

[Equation 1]
Z = 0.5 [seconds] * 8 [sheets]
= 4.00 [seconds]
Next, by detecting the end address of the audio data A12, the data amount from the audio data A5 to A12 recorded in the post-alarm audio area 28d is obtained. The data amount Z thus determined is 30 kB. Next, using the fact that the writing speed of audio data is always constant at 8 kB / sec, the actual recording time Y of the audio data A5 to A12 is as follows.

[Equation 2]
Y = 30 [kB] / 8 [kB / sec]
= 3.75 [seconds]
Next, by subtracting the recording time Y obtained by Equation 2 from the recording time Z obtained by Equation 1, a time W in which the alarm time X is shortened compared to the post-alarm video shooting period is obtained.

[Equation 3]
W = Z-Y
= 0.25 [seconds]
Therefore, the alarm time X is obtained by subtracting the time W obtained by Equation 3 from the post-alarm video shooting period.

[Equation 4]
X = 0.5 [seconds] -W
= 0.25 [seconds]
By registering the alarm time X thus obtained in the management area 28e, the surveillance camera system 10 can reproduce not only pre-alarm video data but also alarm video data and post-alarm video data in real time. Can do.

  The CPU 20 executes video recording processing according to the flowcharts shown in FIGS. First, in step S1, initial processing is performed. Specifically, the set value of the number of pre-alarm images and the shooting / playback cycle thereof, and the setting value of the number of shots of post-alarm video and the shooting / playback cycle input by the user are registered in the management area 28e. Further, the buffer memory 18a, the post alarm video area 28b, and the post alarm audio area 28d are reset. In step S3, voice recording is started. That is, after the audio signal captured by the microphone 16 is converted into audio data by the signal processing circuit 18, the converted audio data is written into the buffer memory 18a.

  In step S5, since the sensor 22 has detected an abnormality, it is determined whether an alarm has been generated. If NO, the process proceeds to step S7. In step S7, the shooting interval of the pre-alarm video registered in the management area 28e is compared with the measured value of the timer 24 to determine whether or not it is the shooting timing of the pre-alarm video. If NO, the flow goes to step S5. If YES, the process proceeds to step S9. In step S9, a pre-alarm video is shot. In step S11, video data of the pre-alarm video that has been shot is written in the pre-alarm video area 28a. In step S13, the audio data written in the buffer memory 18a is transferred and written to the pre-alarm audio area 28c, the buffer memory 18a is reset, and the process returns to step S5.

  If YES is determined in the step S5, the alarm video is taken simultaneously with the detection of the occurrence of the alarm in a step S15. The video data of the captured alarm video is written in the post alarm video area 28b in step S17. In step S19, the alarm sound data written in the buffer memory 18a is transferred and written to the post-alarm sound area 28d, and the buffer memory 18a is reset.

  In step S21, it is determined whether or not the post-alarm video has been shot. That is, the determination is made by comparing the set value of the number of captured post-alarm images registered in the management area 28e with the number of captured image data of the post-alarm images written in the post-alarm image area 28b. If the result is NO, in step S23, the post-alarm video shooting period registered in the management area 28e is compared with the measured value of the timer 24 to determine whether it is the post-alarm video shooting timing. To do. As a result, if NO, the process returns to step S21, and if YES, the process proceeds to step S25.

  In step S25, a post-alarm video is photographed. In step S27, video data of the photographed post-alarm video is written in the post-alarm video area 28b. In step S29, the audio data written in the buffer memory 18a is transferred and written to the post-alarm audio area 28d, the buffer memory 18a is reset, and the process returns to step S21.

  If YES is determined in the step S21, the sound recording is stopped in a step S31. In step S33, when it is assumed that the alarm video and the post-alarm video recorded in the post-alarm video area 28b are all taken at the post-alarm video shooting cycle, the audio data to be written in the post-alarm audio area 28d is recorded. Ask for time.

  In step S35, the amount of audio data written in the post-alarm audio area 28d is detected. That is, since the post-alarm audio area 28d is reset and the audio data is written from the head address before the audio data is written, if the end address of the post-alarm audio data is searched, the data amount of the post-alarm audio area 28d is reduced. Can be detected. Then, using the fact that the writing speed of the voice data is always constant, the actual recording time of the voice data written in the post-alarm voice area 28d is calculated from the data volume of the detected voice data and the writing speed. Ask.

  In step S37, first, a time obtained by subtracting the recording time obtained in step S35 from the recording time obtained in step S33 is obtained. Next, the alarm time is obtained by subtracting the obtained time from the post-alarm image capturing period. The alarm time obtained in this way is registered in the management area 28e.

  In step S39, the number of pieces of video data traced back from the alarm video by the set value of the number of pre-alarm videos registered in the management area 28e out of the video data written in the pre-alarm video area 28a is pre-alarm video. Identify as data. In step S41, audio data corresponding to the specified pre-alarm video data is set as pre-alarm audio data. At this time, writing of the pre-alarm audio data starts from the position of the audio data immediately before the occurrence of the alarm by a position that is backed by the audio data corresponding to the time determined based on the pre-alarm video shooting period and the number of shots. Position. In step S43, the specified pre-alarm video data and pre-alarm audio data, and the video data and audio data written in the post-alarm video area 28b and the post-alarm audio area 28d are transferred to the HDD 34 and recorded on the hard disk 36. To do.

  The CPU 20 also executes reproduction processing of video data and audio data recorded on the hard disk 36 according to the flowcharts shown in FIGS. In step S51, the pre-alarm video data, the alarm video data and the post-alarm video data recorded on the hard disk 36 are transferred to the SDRAM 28, the pre-alarm video data is written into the pre-alarm video area 28a, and the alarm video data and the post-alarm video are recorded. Data is written in the post-alarm video area 28b. Also, pre-alarm audio data, alarm audio data and post-alarm audio data are transferred to the SDRAM 28, pre-alarm audio data is written to the pre-alarm audio area 28c, and alarm audio data and post-alarm audio data are written to the post-alarm audio area 28d. .

  In step S53, reproduction of the audio data is started in the order of recording from the pre-alarm audio data written in the SDRAM 28. In step S55, the process waits until the pre-alarm video data reproduction cycle elapses. Specifically, the determination is made by comparing the reproduction period of the pre-alarm video data registered in the management area 28e with the measured value of the timer 24.

  In step S57, it is determined whether or not the reproduction of the last pre-alarm video data has been completed. Specifically, the setting value of the number of pre-alarm images captured in the management area 28e is compared with the number of captured pre-alarm video data to be determined. As a result, if NO is determined, the pre-alarm video data is reproduced in step S59. That is, the reproduction cycle of the pre-alarm video data registered in the management area 28e is read, and the compressed pre-alarm video data is expanded for each reproduction cycle. The expanded pre-alarm video data is converted into a composite signal and output to the monitor 42. In step S61, the process waits until the pre-alarm video data reproduction cycle elapses. Then, when the reproduction cycle of the pre-alarm video data has elapsed, the process returns to step S57.

  If YES is determined in the step S57, the process waits until the alarm time elapses in a step S63. Whether the alarm time has elapsed is determined by reading the alarm time registered in the management area 28e and comparing the read alarm time with the measured value of the timer 24. When the alarm time has elapsed, the alarm video data is reproduced in step S65. That is, the compressed alarm video data is decompressed, and the decompressed alarm video data is converted into a composite signal and output to the monitor 42. In step S67, the process waits until the post-alarm video data playback cycle elapses. Specifically, the determination is made by comparing the reproduction period of the post-alarm video data registered in the management area 28e with the measured value of the timer 24.

  In step S69, it is determined whether or not the reproduction of the post-alarm video data has been completed. Specifically, the determination is made by comparing the set value of the number of captured post-alarm images registered in the management area 28e with the number of captured post-alarm image data written in the post-alarm video area 28b. If the result is NO, the post-alarm video data is reproduced in step S71. That is, the reproduction cycle of post-alarm video data registered in the management area 28e is read, the post-alarm video data compressed for each reproduction cycle is expanded, and the expanded post-alarm video data is converted into a composite signal and monitored. Output to 42.

  In step S73, the process waits until the post-alarm video data playback cycle elapses. When the post-alarm video data playback cycle elapses, the process returns to step S69. If YES is determined in the step S69, the reproduction process is terminated after the reproduction of the audio data is terminated in a step S75.

  As can be seen from the above description, the monitoring video imaged by the camera 12 is captured at a predetermined cycle. The plurality of captured monitoring videos are recorded in the SDRAM 28. In response to the occurrence of an alarm, the operation timing for capturing the monitoring video is changed. The changed operation timing is specified based on an operation period for capturing the monitoring video and a predetermined cycle.

  The monitoring video recorded on the hard disk 36 is reproduced at a predetermined cycle. At this time, the operation timing for the monitoring video captured in response to the occurrence of the alarm is changed to the changed operation timing.

  As described above, when the monitoring video captured in response to the occurrence of the alarm is reproduced, the video captured at a timing other than the original operational timing is included by changing the operation timing to the specified operational timing. Surveillance video can be played back in real time.

  In addition, audio is captured in parallel with the monitoring video capturing operation, and the size of the captured audio is detected. The operation timing changed based on the detected audio size and the predetermined cycle can be specified, and if the specified operation timing is used, the monitoring video including the video captured at a timing other than the original operation timing can be displayed in real time. Can be played.

  In the above-described embodiment, the post-alarm sound data written in the buffer memory 18a is transferred and written to the post-alarm sound area 28d every time a post-alarm video is captured. However, the post-alarm audio data may be written in the buffer memory 18a until the post-alarm video shooting is completed, and the post-alarm audio data may be collectively transferred to the post-alarm audio area 28d after the shooting is completed.

It is a block diagram which shows one Example of this invention. It is an illustration figure which shows the mapping state of SDRAM. It is an illustration figure which shows the relationship between audio | voice data and video data. It is a flowchart which shows a part of operation | movement of FIG. 1 Example. It is a flowchart which shows a part of other operation | movement of FIG. 1 Example. It is a flowchart which shows a part of other operation | movement of FIG. 1 Example. It is a flowchart which shows a part of operation | movement of FIG. 1 Example further. It is a flowchart which shows a part of other operation | movement of FIG. 1 Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Surveillance camera system 12 ... Camera 16 ... Microphone 18a ... Buffer memory 20 ... CPU
22 ... Sensor 28 ... SDRAM
28a ... Pre-alarm video area 28b ... Post-alarm video area 28c ... Pre-alarm audio area 28d ... Post-alarm audio area 28e ... Management area 30 ... JPEG codec 36 ... Hard disk

Claims (6)

First capturing means for capturing a monitoring image at a predetermined period;
First recording means for recording a plurality of monitoring images captured by the first capturing means;
First changing means for changing the operation timing of the first capturing means in response to occurrence of an alarm;
Specifying means for specifying the operation timing changed by the first changing means based on the operation period of the first capturing means and the predetermined period;
First reproduction means for reproducing a plurality of monitoring videos recorded by the first recording means at the predetermined period; and an operation timing of the first reproduction means for the monitoring video captured in response to the occurrence of the alarm. A monitoring video processing apparatus comprising second changing means for changing to the operation timing specified by the specifying means. A second capturing means for capturing audio in parallel with the capturing operation of the first capturing means;
The monitoring video apparatus according to claim 1, wherein the specifying unit includes a size detecting unit that detects a size of the audio captured by the second capturing unit in order to specify the operation period.   The monitoring video recording apparatus according to claim 2, further comprising a second recording unit that records the audio captured by the second capturing unit. The size detection means includes an alarm size detection means for detecting a size of audio corresponding to the monitoring video captured in response to the occurrence of the alarm and the monitoring video captured after the occurrence of the alarm,
The specifying means includes alarm specifying means for specifying the changed operation timing based on the size of the sound detected by the alarm size detecting means and the predetermined period,
The second changing means includes alarm changing means for changing the operation timing of the first reproduction means for the monitoring video captured in response to the occurrence of the alarm to the operation timing specified by the alarm specifying means. Item 4. The surveillance video recording apparatus according to Item 2 or 3. The first capturing means includes pre-alarm video capturing means for capturing a monitoring video before the occurrence of the alarm,
The first recording means includes pre-alarm video recording means for cyclically recording the monitoring video captured by the pre-alarm video capturing means,
The second capturing means includes pre-alarm sound capturing means for capturing sound before the occurrence of the alarm,
5. The surveillance video recording apparatus according to claim 3, wherein the second recording unit includes a pre-alarm audio recording unit that cyclically records the audio captured by the pre-alarm audio capturing unit.   The surveillance video device according to claim 3, further comprising second reproduction means for reproducing the sound recorded by the second recording means.

Images