JP4551347B2 - Surveillance image recording apparatus and recording method thereof. - Google Patents

Description

  The present invention relates to a recording method applied to a monitoring recording apparatus that records an image input from a camera.

  A conventional monitoring and recording apparatus detects an object such as an intruder and records only an image while the intruder or the like is detected (see, for example, Patent Document 1).

JP 2000-253390 A

  However, flexible recording according to the number of subjects in the monitoring range could not be performed.

  An object of the present invention is to provide a recording method capable of performing flexible recording according to the number of subjects in the monitoring range.

  The present invention measures the number of subjects in the monitoring range, sets the recording frame rate high if the measured number exceeds a predetermined value, and sets the recording frame if the measured number does not exceed the predetermined value. It is characterized in that the rate is set low and the image of the subject is converted into a set frame rate and recorded.

  Further, the present invention is characterized in that the number of subjects in the monitoring range is measured, a frame rate is set according to the measured number, and an image of the subject is converted into a set frame rate and recorded. .

  According to the present invention, flexible recording according to the number of subjects in the monitoring range can be performed.

  Embodiments of a monitoring recording apparatus having a recording method according to the present invention will be described below.

  FIG. 1 is a configuration diagram of an embodiment of a monitoring recording apparatus having a recording method according to the present invention.

  In FIG. 1, reference numeral 100 denotes a monitoring recording device, which records an image of a subject 102 in a monitoring range 101.

  FIG. 2 is a configuration diagram of the monitoring recording apparatus 100 in FIG.

  In FIG. 2, reference numeral 200 denotes a CPU (central processing unit), and 201 denotes a bus connected to the CPU (central processing unit) 200.

  An image sensor 202 is connected to the bus 201 via the A / D conversion unit 203. A temporary recording memory (ring buffer) 204 is connected to the bus 201. Reference numeral 205 denotes an input / output device, which is an interface for inputting a sensor signal for informing the passage of the subject 101 from the sensor 103 provided at the entrance and exit of the monitoring range 101 in FIG. Connected to the bus 201.

  A network control unit 206 is connected to the bus 201 and a network such as a LAN (not shown) so as to be able to transmit and receive data with devices on the network.

  A compression / decompression unit 207 is connected to the bus 201. A data management unit 208 is connected to the bus 201 and manages various data related to recorded image data. Reference numeral 209 denotes a memory which is connected to the bus 201, is stored in a state where the program of the monitoring recording apparatus 100 can be executed, and is read and executed sequentially. A predetermined value of the subject is stored in advance.

  An image processing unit 210 is connected to the bus 201 and performs timely image processing on an image temporarily recorded in the temporary recording memory (ring buffer) 204. A recording device 211 is connected to the bus 201 and records an image processed by the image processing unit 210.

  FIG. 3 is a diagram showing an operation flowchart of an example of the recording method according to the present invention.

The CPU (central processing unit) in FIG. 2 takes an image of the monitoring range 101 in FIG. (300).

Next, whether the subject 102 is in the monitoring range 101 in FIG. 1 is determined by the CPU (central processing unit) 200 in FIG. 2 passing the subject 102 from the sensor 103 provided at the entrance or exit of the monitoring range 101 in FIG. Judgment is made by checking the presence / absence of a sensor signal to be notified (301).

  When the subject 102 is in the monitoring range 101, the CPU (central processing unit) 200 in FIG. 2 calculates the number of subjects imaged by the image sensor 202 and A / D (analog / digital) converted by the A / D converter 203. Measurement is performed by the image recognition function (302).

  Next, the CPU (central processing unit) 200 in FIG. 2 determines whether the measured number of images of the subject exceeds a predetermined value of the subject stored in advance in the memory 209 in FIG. 2 (303).

  If the measured number of subjects exceeds the predetermined value of the subject, the CPU (central processing unit) in FIG. 2 sets a high frame rate for recording processed by the image processing unit 210 (304).

  If the measured number of subjects does not exceed the predetermined value of the subject, the CPU (central processing unit) in FIG. 2 sets the recording frame rate processed by the image processing unit 210 to a low level (305).

  Next, the CPU (central processing unit) in FIG. 2 reads the recorded image from the temporary recording memory (ring buffer) 204, converts it to the set frame rate, and records the converted image in the recording device 211 (306). .

  FIG. 4 is a diagram showing an operation flowchart of another example of the recording method according to the present invention.

The CPU (central processing unit) in FIG. 2 takes an image of the monitoring range 101 in FIG. (400).

Next, whether the subject 102 is in the monitoring range 101 in FIG. 1 is determined by the CPU (central processing unit) 200 in FIG. 2 through the passage of the subject 102 from the sensor 103 provided at the entrance or exit of the monitoring range 101 in FIG. Judgment is made by checking the presence or absence of a sensor signal to be notified (401).

  When the subject 102 is in the monitoring range 101, the CPU (central processing unit) 200 in FIG. 2 calculates the number of subjects imaged by the image sensor 202 and A / D (analog / digital) converted by the A / D converter 203. Measure (402).

  Next, the CPU (central processing unit) in FIG. 2 sets the frame rate of recording processed by the image processing unit 210 according to the number of subjects measured in the number of subjects (402) (403). For example, when the number of subjects is 1, the recording frame rate is 1 fps (frame per second), when the number of subjects is 5, the recording frame rate is 5f, and when the number of subjects is 10, the recording frame rate is 10f. When the number of subjects is 30, the recording frame rate is set to 30f.

  Next, the CPU (central processing unit) in FIG. 2 reads the recorded image from the temporary recording memory (ring buffer) 204, and converts it into the set frame rate by the image processing unit 210 (404).

  Then, the CPU (central processing unit) in FIG. 2 records the converted image in the recording device 211 (405).

  In this embodiment, the case where the camera and the monitoring recording apparatus are integrated has been described. However, the present invention can also be applied to an environment where the camera and the monitoring recording apparatus are separately arranged.

  In this embodiment, the setting of the recording frame rate has been described. However, the present invention can also be applied to the setting of the compression rate, image quality, number of pixels, and the like. For example, if the number of subjects exceeds a predetermined value, the compression rate is set low, the image quality is increased, or the number of pixels is set to be large. Conversely, if the number of subjects does not exceed the predetermined value, The compression rate may be set high, the image quality may be low, or the number of pixels may be reduced.

It is a block diagram of an embodiment of a monitoring recording apparatus having a recording method according to the present invention. It is a block diagram of the monitoring recording apparatus in FIG. It is a figure which shows the operation | movement flowchart of the example of the recording method which concerns on this invention. It is a figure which shows the operation | movement flowchart of the other example of the recording method which concerns on this invention.

Explanation of symbols

  100: monitoring recording device, 101: monitoring range, 102: subject, 103: sensor, 200: CPU (central processing unit), 201: bus, 202: image sensor, 203: A / D conversion unit, 204: temporary recording memory (Ring buffer), 205: input / output device, 206: network control unit, 207: compression / decompression unit, 208: data management unit, 209: memory, 210: image processing unit, 211: recording device.

Claims (2)

A recording method of a monitoring recording apparatus for recording an image of a subject within a monitoring range,
The image is temporarily recorded, and when the subject is in the monitoring range, the number of subjects in the monitoring range is measured, and if the measured number exceeds a predetermined value, the recording frame rate is set high, number measured is set low frame rate of the recording if not exceed the predetermined value, the recording of the image of the temporary recorded subject, the monitoring image recording apparatus and recording by converting the frame rate set Method. A monitoring and recording device that records an image of a subject within a monitoring range,
A first memory for temporarily recording the image; a subject detection signal input means for inputting a subject detection signal when the presence or absence of a subject within the monitoring range is detected; and a subject detection signal for the subject detection signal input means. When input, subject measuring means for measuring the number of subjects, and if the number of subjects measured by the subject measuring means exceeds a predetermined value, a recording frame rate is set high, and the measured subject Recording rate control means for setting a recording frame rate to a low value if the number of images does not exceed a predetermined value; and a second memory in which the temporarily recorded subject image is converted to a set frame rate and recorded. A monitoring image recording apparatus comprising:

Images