JP2006041779A - Monitoring apparatus and monitoring method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a monitoring apparatus and a supervisory method for accurately sensing an imaging disturbance applied to the lens face or the like of a camera and continuing photographing even after imaging disturbance is received. <P>SOLUTION: A plurality of coating areas coated with a substance on which a disturbing material for disturbing an object light inputted to the camera is hardly adhered and which has an action of at least water repelling or water proofing or paint repelling, and non-coating areas provided to a position to which the disturbing material is hardly attached and which is not affected by the photographing by the camera are provided to a transparent cover. The photographing disturbance is sensed by comparing relationships of temporal changes in a luminance level being information on areas corresponding to the arbitrary coating area and the arbitrary non-coating area of an image imaged through the transparent cover. Thus, the monitoring apparatus and the monitoring method can be provided, with which the imaging disturbance such as adhesion of a disturbing material for shielding the object light such as a spray paint applied to the lens and the cover or the like of the camera is sensed and photographing can be continued even when the imaging is disturbed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a monitoring apparatus and a monitoring method for detecting an imaging disturbance to a monitoring camera or the like and detecting that the imaging disturbance has occurred.

In general, a surveillance camera is sometimes installed as one of crime prevention means. The installation location covers a wide range from ATMs and precious metal stores to home use. However, if an intruder who has entered such a place for criminal purposes notices a surveillance camera or the like, the intruder may interfere with the image pickup by attaching spray paint or the like to the lens surface of the camera. In this case, since it is impossible to capture the image, it is known that the image has been disturbed, and the security system company is notified that the image has been obstructed. Intruder monitoring, that is, subsequent imaging may become impossible. In addition, when the image is disturbed by a translucent spray paint, it is difficult to detect that the image has been disturbed. On the other hand, if the sensitivity of detection is increased, the image is not disturbed due to some influence, but the image is disturbed. There are many cases of false detection. Therefore, it is desirable to be able to determine whether or not the imaging lens is obstructed on the lens surface or the lens cover of the camera, and a monitoring device in which spray paint or the like does not adhere to enable imaging even after the imaging is obstructed.

Patent Document 1 discloses an example of a monitoring camera device that can detect an obstacle present on a lens surface of a camera and the like, and can detect the obstacle based on a difference between the obstacle and a decrease in illuminance. In this prior art 1, for each pixel of the monitoring image where the lens surface or the like of the camera is contaminated, an edge (a part indicating the outer edge of the subject such as the boundary between subjects in the image) according to the amount of change in luminance value with the surrounding pixels. ) The amount is calculated, a determination reference value is set in advance, and an obstacle such as a lens surface of the camera is determined based on the reference value and the calculated edge amount.
Further, Patent Document 2 discloses an example of an optical member in which water droplets hardly adhere to the lens surface of the camera. In this prior art 2, water repellent treatment is applied to the outer wall of the camera to make it difficult for water droplets to adhere.
JP2003-189294A [H04N7 / 18, 5/255] JP-A-5-232565 [G03B17 / 08]

  In the prior art 1, even if an obstacle can be detected on the lens surface of the camera, the subsequent imaging cannot be performed. Further, in the prior art 2, since the lens portion is subjected to water repellent treatment, it is difficult for paint to adhere to it and it is difficult to detect whether or not the imaging has been disturbed.

  The present invention solves the above-described problems, and provides a monitoring device and a monitoring method capable of accurately sensing an imaging disturbance such as a lens surface of a camera and continuing photographing even after the imaging disturbance has occurred. That is.

According to the first aspect of the present invention, in the monitoring device that detects that the image pickup by the camera is obstructed, the camera and the first area to which the obstruction that obstructs the subject light input to the camera is difficult to adhere are provided. Compare the temporal change in the information from the first area and the second area of the images from the camera provided through the cover and the cover provided with the second area that is not so as to detect imaging disturbance. And a comparison detection means.

  The first area is an area where obstructions that obstruct the subject light input to the camera are less likely to adhere, and the second area is an area where obstructions are less likely to adhere. The cover has these two areas. The information from the first area is information from the first area where obstructions are difficult to adhere. The information from the second area is information from the second area where obstructions are not easily attached. The comparison detection means detects imaging disturbance by comparing the relationship of temporal changes in information of the first area and the second area.

  The cover has a first area where obstructions that obstruct the subject light input to the camera are less likely to adhere, and a second area where obstructions are less likely to adhere. Even if an image obstruction such as an obstruction that blocks the subject light is attached, the image does not adhere to the first area of the cover, so the image can be continued. In addition, spray paint or the like is not difficult to adhere to the second area of the cover, that is, adheres. Information on the first area and the second area when there is no obstruction to the cover, such as spray paint and other obstructions that block subject light, and the above-mentioned image obstruction to the cover. The imaging disturbance can be detected by comparing the relationship between the information of the first area and the second area.

  According to a second aspect of the present invention, in the monitoring device according to the first aspect, the first area is an area coated with at least a water repellent or waterproof or paint repellent substance. . In other words, the first area is coated with a substance having at least water repellency or waterproofing or a paint repelling action, so that an obstructing substance that obstructs subject light input to the camera is less likely to adhere.

  According to a third aspect of the present invention, in the monitoring device according to any one of the first and second aspects, the comparison and detection means has a relationship between temporal changes in the luminance level as information of the first area and the second area. It is characterized in that imaging disturbance is detected by comparison. In other words, when imaging obstructions such as spray paint or other obstructions that block subject light are attached to the cover, the luminance level that is information on the first area where obstructions are not attached and obstructions are attached. The relationship between the brightness level, which is information about the second area, and the brightness level, which is information about the first area, and the brightness level, which is information about the second area, when there is no image pickup interference on the cover Then, it can be seen that the luminance level is changed when the imaging is disturbed, and it can be detected that the imaging is disturbed.

  According to a fourth aspect of the present invention, in the monitoring device according to any one of the first to third aspects, the second area is provided in a position at which the cover is not affected by the image pickup by the camera. In other words, when an action to attach an obstruction to the cover as an imaging disturbance is made, if the second area is a place where the imaging by the camera is not disturbed, the camera can sense that the imaging has been disturbed. In addition, there is no problem in the subsequent imaging.

  A fifth aspect of the present invention is the monitoring apparatus according to any one of the first to fourth aspects, wherein a plurality of second areas are provided in the cover. In other words, when an obstacle such as spray paint is attached to the cover as an image pickup obstruction, when an obstruction accidentally adheres to a part of the cover, if it is not a part where the obstruction adheres, When the second area is provided, it cannot be sensed that the imaging is disturbed. Therefore, the above can be prevented by providing a plurality of second areas on the cover.

  According to a sixth aspect of the present invention, in the monitoring device that detects that the image pickup by the camera is obstructed, the camera and the first area to which an obstruction that obstructs the subject light input to the camera is difficult to adhere are provided. A comparison that detects imaging disturbances by comparing the temporal change in information of the first area and the second area of the images from the lens provided with the second area and the camera imaged through the lens. And a detecting means.

  The invention according to claim 7 is the monitoring device according to claim 6, wherein the first area is an area coated with at least a water repellent or waterproof or paint repellent substance. .

  According to an eighth aspect of the present invention, in the monitoring device according to any one of the sixth to seventh aspects, the comparison detection means compares the luminance levels as information of the first area and the second area, thereby preventing the image pickup disturbance. It is characterized by detecting. According to a ninth aspect of the present invention, in the monitoring device according to any of the sixth to eighth aspects, the second area is provided at a position where the lens is not affected by imaging by the camera.

  According to a tenth aspect of the present invention, in the monitoring device according to any one of the sixth to ninth aspects, a plurality of second areas are provided in the lens.

  According to the eleventh aspect of the present invention, there is provided a monitoring method for detecting that the image pickup by the camera is obstructed, wherein the obstruction obstructing the subject light input to the camera is difficult to adhere to the first area. Among the images from the camera imaged through a cover or lens provided with a second area, the imaging disturbance is detected by comparing the relationship of temporal changes in information from the first area and the second area. It is characterized by that.

  According to a twelfth aspect of the present invention, there is provided a monitoring method for detecting that the image pickup by the camera is obstructed, wherein the obstruction obstructing the subject light input to the camera is less likely to adhere to the first area. Among the images from the camera imaged through the cover or lens provided with the area, the image is obtained by comparing the temporal change relationship of the luminance level as information from the first area and the second area. It is characterized by detecting interference.

  According to a thirteenth aspect of the present invention, in the monitoring method according to any one of the eleventh to twelfth aspects, the second area is an area coated with at least a water repellent or waterproof or paint repelling substance. It is characterized by that.

  The invention according to claim 14 is characterized in that the second area is provided at a position where the cover or the lens is not affected by the image of the subject by the camera.

  In the monitoring device according to the first aspect of the present invention, the cover is provided with a first area where obstructions that obstruct subject light input to the camera are less likely to adhere, and a second area where obstructions are less likely to adhere. Therefore, even if imaging obstruction such as adhering obstruction to the subject light such as spray paint adheres to the cover, it does not adhere to the first area of the cover, so that imaging can be continued. In addition, spray paint or the like is not difficult to adhere to the second area of the cover, that is, adheres. Information on the first area and the second area when there are no obstructions such as spray paint on the cover that obstructs the subject light, and information on the first and second areas when the obstruction is not obstructed. The imaging disturbance can be detected by comparing the relationship between the information of the first area and the second area.

  In the monitoring apparatus according to the second aspect of the present invention, the first area is coated with a substance having an action of at least water repellency or waterproofing or repelling paint, thereby obstructing subject light input to the camera. It becomes difficult for substances to adhere.

  In the monitoring device according to the third aspect of the present invention, the comparison means further includes a luminance level as information on the first area where the obstruction is not attached and luminance as information on the second area where the obstruction is attached. Comparing the relationship between the level and the brightness level, which is information of the first area when there is no interference with the cover, and the brightness level, which is the information of the second area, Shows that the luminance level has changed, and can detect that the imaging has been disturbed.

  In the monitoring device according to the fourth aspect of the present invention, since the second area is a place where the image pickup by the camera is not disturbed, the image pickup disturbance can be sensed, and the subsequent image pickup is not affected.

  In the monitoring apparatus according to the fifth aspect of the present invention, when a plurality of second areas are provided on the cover, the imaging disturbance is detected when the imaging disturbance such as spray paint is attached to only a part of the cover. Leakage can be prevented.

  Further, in the monitoring device and the monitoring method according to the inventions of claims 6 to 14, the same effects as those of the monitoring devices of the inventions of claims 1 to 5 described above can be obtained.

  As described above, in the present invention, it is possible to detect an imaging disturbance such as adhering an obstacle that blocks subject light, such as spray paint, to a camera lens, a cover, etc., and to continue imaging even after the imaging disturbance has occurred. A monitoring device and a monitoring method that can be provided can be provided.

  With reference to FIG. 1, the monitoring device 10 of this embodiment includes a transparent cover 12, a camera 14 having a CCD imager, a lens unit 16, a processing unit 30, a display device unit 62, a recording unit 70, and an alarm output unit 74. Is done. The camera 14 includes a diaphragm mechanism and a CCD that is a solid-state imaging device. The transparent cover 12 is made of an acrylic material and is provided at a position where the distance between the transparent cover 12 and the lens unit 16 is a focal point that does not interfere with the captured image and video even if fine water droplets or the like are present on the transparent cover 12. ing. The captured image and video are captured through the transparent cover 12 by the lens unit 16 and the camera 14. The camera 14 is connected to the processing unit 30 and the cable 32, and the captured image and video are sent to the processing unit 30 through the cable 32, and various processing is performed by the processing unit 30. The processed captured image and video are displayed by the display unit 62 and recorded by the recording unit 70. In addition, the processing unit 30 detects an imaging disturbance, and the alarm output unit 74 transmits an alarm signal to a security system company or the like (not shown). Details of the processing unit 30 will be described later.

  2 and 3 are illustrations of the transparent cover 12. Referring to FIG. 2, the transparent cover 12 is configured to be larger than the area on the front side of the lens unit 16 and larger than the imaging area 22 captured by the camera 14. Further, the transparent cover 12 has a coating area 18 (shaded area) that is a first area in which an antifouling coating to which obstructions are difficult to adhere is processed and a non-coating area 20a that is a second area that is not antifouling coated. , 20b, 20c, 20d. For example, as an antifouling coating material, Daikin Corporation's OPTOOL (registered trademark) DSX, Toray Industries, Inc. SR2411, or the like is applied. And the imaging area 22 imaged with the camera 14 through the transparent cover 12 contains the said coating area 18 and the non-coating area 20a, 20b, 20c, 20d.

  The non-coating areas 20 a, 20 b, 20 c, and 20 d are arranged at four arbitrary positions in the imaging area 22 of the transparent cover 12. When spray paint is attached to the imaging area 22, the spray paint adheres to the coating area 18 for a moment, but it becomes a fine ball shape within a few seconds. The coating area 18 occupies most of the imaging area 22, and even if a fine ball-shaped spray paint is present in the imaging area 22, the imaging is not affected. On the other hand, spray paint adheres to the non-coating areas 20a, 20b, 20c, and 20d. Accordingly, the transparent cover 22 is arranged at a position where the non-coating areas 20a, 20b, 20c, and 20d do not affect the imaging even if spray paint adheres to the non-coating areas 20a, 20b, 20c, and 20d.

  As shown in FIG. 3, in this embodiment, the imaging area 22 is divided into 30 (all have the same area), and the non-coating areas 20a, 20b, 20c, and 20d are arranged at arbitrary four locations. Note that the size of each area obtained by dividing the imaging area 22 is the non-coating areas 20a, 20b, 20c, and 20d of the imaging area 22 when the imaging cover 22 is blocked by spray paint or the like. Therefore, the imaging area 22 may be divided so that the non-coating areas 20a, 20b, 20c, and 20d have such a size. In this embodiment, four non-coating areas 20a, 20b, 20c, and 20d are provided. However, it is only necessary to provide a number that does not interfere with imaging and does not erroneously detect imaging interference.

  And 30 areas of the imaging area 22 divided into 30 each have an address indicating a position. From the left to the right in the first row of the first row, Ad01, Ad02,..., Ad29, Ad30 are provided, and addresses are determined up to the sixth row of the fifth row. In this case, the address of the four non-coating areas 20a is Ad08, the non-coating area 20b is the address Ad11, the non-coating area 20c is the address Ad20, and the non-coating area 20d is the address Ad23. Of the 30 areas of the 30-divided imaging area 22, four areas are non-coating areas 20a, 20b, 20c, and 20d, and any four of the coating areas 18 having the remaining 26 areas are arbitrarily selected. Areas are selected. The arbitrarily selected four areas are defined as areas 18a, 18b, 18c, and 18d. For each of the four areas, the area 18a is the address Ad07, the area 18b is the address Ad12, the area 18c is the address Ad19, and the area 18d is the address Ad24.

  In the case where the image pickup is obstructed, for example, spray paint is applied to the transparent cover 22, the brightness levels of the four areas 18a, 18b, 18c, 18d arbitrarily selected from the coating area 18 as the first area and the second area. The difference values of the luminance levels of the non-coating areas 20a, 20b, 20c, and 20d, which are the areas of the above, are compared with the difference values calculated in the same manner before the predetermined time stored in the recording unit 70. The camera detects an imaging disturbance with the magnitude of the change and sends an alarm signal to a security system or the like.

  A block diagram of the monitoring device 10 is shown in FIG. The monitoring apparatus 10 of the present embodiment includes a transparent cover 12 having a coating area 18 as a first area and non-coating areas 20a, 20b, 20c, and 20d as a second area, a camera 14 that captures a subject (not shown), An A / D converter 52 that converts an analog imaging signal output from the camera 14 into digital imaging data, a signal processing circuit 54 that processes the digital imaging data into digital image data, an SDRAM 56 that temporarily stores various data, a digital A D / A converter 58 that converts image data into an analog image signal, a video encoder 60 that converts an analog image signal into an NTSC signal, a display device 62 that displays the captured image, and digital image data in JPEG (Joint Photographics Experts Group) Compression, decompression Optional JPEG codec circuit 68, hard disk recorder 70 that records digital compressed data compressed by JPEG, holds data, operation key 80 that is an input unit for the operator to operate monitoring device 10, and coating area 18 An integration circuit 66 for digitally integrating the luminance levels of the respective pixels in the four areas 18a, 18b, 18c, 18d and the uncoated areas 20a, 20b, 20c, 20d, an alarm output circuit 74 for outputting an alarm, and It has a counter 73 that counts time, and is composed of an SDRAM 56, an integration circuit 66, a JPEG codec circuit 68, an alarm output circuit 74, and a CPU 72 that gives control signals to the hard disk recorder 70.

  First, with respect to the 30-divided imaging area 22 of the transparent cover 12, the location setting of the non-coating areas 20a, 20b, 20c, and 20d is selected by a menu button (not shown) of the operation key 80, not shown. Four areas are designated from 30 areas of the imaging area 22 divided into 30 by the cursor button. Similarly, four areas 18a, 18b, 18c and 18d are selected from the 26 coating areas 18 excluding the non-coating areas 20a, 20b, 20c and 20d from the imaging area 22, and designated. This operation is performed when setting the non-coating areas 20a, 20b, 20c, and 20d again when initially setting or when the transparent cover 12 is damaged. Once designated, the contents are retained, and are valid unless the four non-coating areas 20a, 20b, 20c, 20d and the four areas 18a, 18b, 18c, 18d are designated by the operation key 80 again.

  Further, as described above, the 30 areas of the imaging area 22 divided into 30 have addresses indicating positions. The addresses of the 30 areas are stored in the area A1 in the hard disk recorder 70. When the cursor 72 is used to designate four uncoated areas 20a, 20b, 20c, and 20d among the 30 areas by the operation key 80, the CPU 72 addresses Ad08 of the designated four non-coated areas 20a, 20b, 20c, and 20d. , Ad11, Ad20, Ad23 are extracted from the area A1 in the hard disk recorder 70 and stored in the area A2. Similarly, the addresses Ad07, Ad12, Ad19, Ad24 of the areas 18a, 18b, 18c, 18d are taken out from the area A1 in the hard disk recorder 70 and stored in the area A2.

  In this embodiment, the operator selects four areas from the 26 addresses of the coating area 18, and the addresses Ad07, Ad12, Ad19, Ad24 are stored in the areas A1 to A2 by the CPU 72. , 4 addresses out of 26 addresses in 26 areas may be randomly stored in the area A1 to the area A2.

  In this embodiment, when detecting difference data of luminance data between a coating area 18 and a non-coating area 20a, 20b, 20c, 20d, which will be described later, four areas 18a, 18b, 18c, 18d in the coating area 18 The luminance data is compared in the non-coating areas 20a, 20b, 20c, and 20d in this order, and the difference data is detected. However, the comparison may not be performed in the order. For example, the area 18b is compared with the uncoated area 20a, the area 18c is compared with the uncoated area 20b, the area 18d is compared with the uncoated area 20c, and the area 18a is compared with the uncoated area 20d. You may let them.

  When the location of the non-coating areas 20a, 20b, 20c, and 20d is changed by the reset button of the operation key 80 (not shown), the addresses Ad08, Ad11, Ad20, and Ad23 of the non-coating areas 20a, 20b, 20c, and 20d are reset. The addresses Ad07, Ad12, Ad19, Ad24 of the areas 18a, 18b, 18c, 18d are also reset.

  When the imaging mode is set by the operation key 80, the CPU 72 gives a control signal to the JPEG codec circuit 68, the SDRAM 56, and the hard disk recorder 70. The analog imaging signal output from the camera 14 is converted into digital imaging data by the A / D converter 52, and the converted digital imaging data is input to the signal processing circuit 54. The signal processing circuit 54 creates R, G, and B signals that are three color signals based on the digital imaging data generated by the A / D converter 52, and then generates Y signals that are luminance signals, Processing for conversion into two color difference signals U and V is performed. The digital image data as Y, U, and V signals obtained for each pixel of the CCD imager is temporarily stored in the SDRAM 56, and the digital image data is compressed by JPEG by the JPEG codec circuit 68. The compressed digital compressed data is stored again using the SDRAM 56 as a memory buffer, and the stored digital compressed data is recorded in the hard disk recorder 70.

  When a reproduction mode for reproducing the recorded image on the display device 62 is set by the operation key 80, the CPU 72 reads out the digital compressed data recorded in the hard disk recorder 70 and the digital compression compressed by the JPEG codec circuit 68. The data is expanded and the digital image data is temporarily stored in the SDRAM 56. The D / A converter 58 generates digital image data into an analog imaging signal, and the video encoder 60 converts the digital image data into an NTSC signal. The image data is displayed on the display device 62.

  Now, when the imaging mode is set by the operation key 80 as described above, disturbance detection is also performed in parallel with the imaging operation. Simultaneously with the imaging operation, the CPU 72 gives control signals to the integration circuit 66 and the alarm output circuit 74 in addition to the above-described operation. The CPU 72 takes out the addresses Ad08, Ad11, Ad20, Ad23 of each of the four non-coating areas 20a, 20b, 20c, 20d stored in the memory A2 in the hard disk recorder 70, and is a digital image captured in the current imaging mode. The brightness levels of all the pixels included in the non-coating areas 20a, 20b, 20c, and 20d corresponding to each address are extracted from the SDRAM 56 in which data is stored. Similarly, the addresses Ad07, Ad12, Ad19, Ad24 of the four areas 18a, 18b, 18c, 18d in the coating area 18 stored in the memory A2 are extracted from the memory A2, and the four addresses Ad07, Ad12, Ad19 are read from the SDRAM 56. , The luminance levels of all the pixels in the four areas 18a, 18b, 18c, 18d corresponding to Ad24 are extracted.

  The CPU 72 determines the luminance levels of all the pixels in each of the four areas 18a, 18b, 18c, and 18d in the extracted coating area 18 and all the pixels in each of the uncoated areas 20a, 20b, 20c, and 20d. The luminance levels of all the pixels for each area are digitally integrated by the integrating circuit 66 and extracted as luminance data for each area. Further, the CPU 72 detects difference data between the luminance data of each of the extracted areas 18a, 18b, 18c, and 18d and the luminance data of each of the non-coating areas 20a, 20b, 20c, and 20d.

  The difference data of each of the four pieces of luminance data that has not been determined to be the previous imaging disturbance stored in the SDRAM 56 is compared with the difference data of each of the four pieces of luminance data this time. The SDRAM 56 stores difference data of each of the four pieces of luminance data that has not been determined to be imaging disturbances last time. The luminance level difference data Y2a between the area 18a in the coating area 18 and the non-coating area 20a is stored in the SDRAM 56. The brightness data difference data Y2b between the area a, the area 18b and the non-coating area 20b is the area b, and the brightness data difference data Y2c between the area 18c and the non-coating area 20c is the area c, the area 18d and the non-coating area 20d. The luminance data difference data Y2d is stored in the area d.

  Then, the difference data Y2a between the luminance data of the area 18a in the coating area 18 and the non-coating area 20a that was not determined as the previous imaging disturbance stored in the area a in the SDRAM 56, and the area in the coating area 18 extracted this time The difference data Y1a of the luminance data between 18a and the non-coating area 20a is compared. Similarly, the difference data of the brightness data of the other three areas 18b, 18c, 18d and the non-coated areas 20b, 20c, 20d in the other three coated areas 18 are also compared.

  In this embodiment, in the detection of the difference data of the luminance data of the coating area 18 that is the first area and the non-coating areas 20a, 20b, 20c, and 20d that is the second area, any 4 in the coating area 18 is detected. The difference data between the luminance data of each of the areas 18a, 18b, 18c, and 18d and the luminance data of each of the non-coating areas 20a, 20b, 20c, and 20d is detected, but any four in the coating area 18 are detected. You may compare the average value of the luminance level of these areas with the non-coating areas 20a, 20b, 20c, and 20d, respectively. Further, the luminance data of any one area in the coating area 18 may be compared with the luminance data of the non-coating areas 20a, 20b, 20c, and 20d.

  Then, the image capturing disturbance is determined by comparing the difference data of each of the four luminance data. If it is determined that any one of the image capturing disturbances is detected, the alarm output circuit 74 is controlled to output an alarm.

  Hereinafter, difference data comparison of luminance data and alarm output determination will be described with reference to FIGS. 5 and 6. FIGS. 5 and 6 show luminance data difference data Y1a, Y1b, Y1c, Y1d between the four areas 18a, 18b, 18c, 18d in the current coating area and the non-coating areas 20a, 20b, 20c, 20d. Comparison processing and alarm output of difference data Y2a, Y2b, Y2c, Y2d of luminance data between the four areas 18a, 18b, 18c, 18d in the previous coating area 18 and the non-coating areas 20a, 20b, 20c, 20d It is a flowchart which shows a judgment process. The CPU 72 executes luminance data comparison processing and alarm output determination processing.

  With reference to FIG. 5 and FIG. 6, in step S1, the luminance data of the coating areas 18a to 18d and the non-coating areas 20a to 20d are detected.

  In step S1a of step S1, the CPU 72 retrieves the address Ad07 corresponding to the area 18a in the coating area 18 from the memory A2, and stores all the digital image data in the area 18a from the SDRAM 56 in which digital image data imaged in the current imaging mode is stored. The luminance level of the pixel is extracted and input to the integrating circuit 66, and the luminance level is detected by digital integration. Similarly, the address Ad08 of the non-coating area 20a is also taken out from the memory A2, and the luminance level of all the pixels in the area 20a is extracted and input to the integrating circuit 66, and the luminance level of all the pixels in the area is digitally integrated. Luminance data is detected.

Similar to step S1a, in step S1b, the CPU 72 detects luminance data of the area 18b in the coating area 18 and the non-coating area 20b.
Similarly, in step S1c, the CPU 72 detects luminance data of the area 18c in the coating area 18 and the non-coating area 20c.
Similarly, in step S1d, the CPU 72 detects the luminance data of the area 18d in the coating area 18 and the non-coating area 20d.

  Next, in step S3, the CPU 72 determines the difference data Y1a of the luminance data between the four areas 18a, 18b, 18c, 18d in the coating area 18 detected in step S1 and the non-coating areas 20a, 20b, 20c, 20d. , Y1b, Y1c, Y1d are detected.

  In step S3a of step S3, the CPU 72 detects difference data Y1a of luminance data between the luminance data of the area 18a in the coating area 18 and the luminance data of the non-coating area 20a detected in step S1a.

  Similarly, in step S3b, difference data Y1b between the luminance data of the area 18b in the coating area 18 detected in step S1b and the luminance data of the non-coating area 20b is detected. In step S3c, difference data Y1c between the luminance data of the area 18c of the coating area 18 detected in step S1c and the luminance data of the non-coating area 20c is detected. In step S3d, difference data Y1d between the luminance data of the area 18d in the coating area 18 detected in step S1d and the luminance data of the non-coating area 20d is detected.

  Next, in step S5, the CPU 72 determines that the difference between the luminance data detected in step S3 is Y1a, Y1b, Y1c, Y1d and the previous imaging disturbance recorded in the areas a, b, c, d in the SDRAM 56. The values of the difference data Y2a, Y2b, Y2c, Y2d of the luminance data that has not been compared are compared to detect the amount of change.

  In step S5a of step S5, the CPU 72 stores the value of the luminance data difference data Y2a between the area 18a in the coating area 18 and the non-coating area 20a that has not been determined as the previous imaging disturbance stored in the area a in the SDRAM 56. In step S3a, the difference between the brightness data difference data Y1a detected from the area 18a in the current coating area 18 and the non-coating area 20a is compared with the extracted difference data Y2a to detect the amount of change. Similarly, also in step S5b, the value of the difference data Y2b of the luminance data that has not been determined as the previous imaging disturbance stored in the area b in the SDRAM 56 and the value of the difference data Y1b of the luminance data detected this time in step S3b To detect the amount of change. Also in step S5c, the value of the difference data Y2c of the luminance data stored in the area c in the SDRAM 56 that has not been determined to be the previous imaging disturbance is compared with the value of the difference data Y1c of the luminance data detected this time in step S3c. Detect the amount of change. Also in step S5d, the value of the difference data Y2d of the brightness data that has not been determined as the previous imaging disturbance stored in the area d in the SDRAM 56 is compared with the value of the difference data Y1d of the brightness data detected this time in step S3d. Detect the amount of change.

  Next, in steps S7 to S29, the CPU 72 determines whether or not the amount of change in value between the luminance data difference data Y1a to Y1d and Y2a to Y2d in step S5 is greater than or equal to the predetermined value T held in the hard disk recorder 70, respectively. Each is judged, and if it is equal to or greater than a predetermined value, each flag is set, and if it is less than the predetermined value, it is replaced with the difference data input this time in each area.

  In step S7, the CPU 72 determines a predetermined value in which the value of the amount of change between the difference data Y2a detected in step S5a and not detected as the previous imaging disturbance and the difference data Y1a detected this time is held in the hard disk recorder 70. It is determined whether or not it is equal to or greater than T. If YES in step S7, that is, if the value of the change amount between the difference data Y2a and Y1a is equal to or greater than T, it is determined that there is an imaging disturbance, and the process proceeds to step S9. That is, the difference between the brightness data difference data Y2a between the area 18a in the coating area 18 and the non-coating area 20a that has been determined not to interfere with the previous imaging is between the area 18a in the coating area 18 detected this time and the non-coating area 20a. Since the value of the difference data Y1a of the brightness data of the above is greatly changed, it can be determined that the imaging disturbance such as the spray paint being adhered is made in the range of the non-coating area 20a to which the spray paint or the like easily adheres. Normally, when imaging disturbance such as spray paint is applied, the luminance data value of the area 18a of the coating area 18 becomes larger than the luminance data value of the non-coating area 20a, and the value of the difference data 1a Also grows. In addition, since the difference data Y2a that has been determined to have no imaging disturbance last time is small, the amount of change increases when the values of the difference data Y2a and Y1a are compared.

  In step S9, the flag a is set in the alarm output circuit 74. If NO in step S7, that is, if the value of the amount of change between the difference data Y2a and Y1a is less than T, the CPU 72 determines that there is no imaging disturbance. The amount of change between the difference data Y2a determined to be no previous imaging disturbance and the difference data Y1a detected this time does not change greatly, that is, between the area 18a in the coating area 18 and the non-coating area 20a. However, since there is almost no difference in the luminance data, it is determined that there is no obstruction of imaging such as spray paint being attached to the range of the non-coating area 20a, and the process proceeds to step S11. In step S11, the CPU 72 replaces the luminance data difference data Y1a that has not been determined to be imaging disturbance at this time in the area a in the SDRAM 56 and the previous luminance data difference data Y2a, and proceeds to step S13.

  Next, in step S13, as in step S7, the change value of the difference data Y2b stored in the area b in the SDRAM 56 and the difference data Y1b detected in step S5b is held in the hard disk recorder 70. It is determined whether or not the value is equal to or greater than a predetermined value T. If YES in step S13, that is, if the value of the change amount of the difference data Y2b and Y1b is equal to or greater than T, it is determined that there is an imaging disturbance in the range of the uncoated area 20b detected this time, and the process proceeds to step S15. In step S15, the flag b is set in the alarm output circuit 74. If NO in step S13, that is, if the value of the amount of change between the difference data Y2b and Y1b is less than T, it is determined that there is no imaging disturbance in the range of the non-coating area 20b detected this time, and the process proceeds to step S17. In step S17, the CPU 72 replaces the luminance data difference data Y1b that has not been determined to be imaging disturbance this time in the area b in the SDRAM 56 with the previous luminance data difference data Y2b, and proceeds to step S19.

  In step S19, similarly to step S7, the change value of the difference data Y2c stored in the area c in the SDRAM 56 and the difference data Y1c detected in step S5c is held in the hard disk recorder 70. It is determined whether or not the value is equal to or greater than a predetermined value T. If YES in step S19, that is, if the value of the amount of change between the difference data Y2c and Y1c is equal to or greater than T, it is determined that there is imaging interference within the range of the non-coating area 20c detected this time, and the process proceeds to step S21. In step S21, a flab c is set in the alarm output circuit 74. If NO in step S19, that is, if the value of the amount of change between the difference data Y2c and Y1c is less than T, it is determined that there is no imaging disturbance in the range of the non-coating area 20c detected this time, and the process proceeds to step S23. In step S23, the CPU 72 replaces the difference data Y1b of the luminance data that has not been determined to be imaging disturbance this time in the area c in the SDRAM 56 with the difference data Y2c of the previous luminance data, and proceeds to step S27.

  In step S27, as in step S7, the CPU 72 holds the difference data Y2d stored in the area d in the SDRAM 56 and the change value of the difference data Y1d detected in step S5d in the hard disk recorder 70. It is determined whether or not the predetermined value T is exceeded. If YES in step S27, that is, if the value of the amount of change between the difference data Y2d and Y1d is equal to or greater than T, it is determined that there is imaging interference within the range of the uncoated area 20d detected this time, and the process proceeds to step S25. In step S25, a flag d is set in the alarm output circuit 74. If NO in step S27, that is, if the value of the amount of change between the difference data Y2d and Y1d is less than the predetermined value T, it is determined that there is no imaging disturbance in the range of the non-coating area 20d detected this time, and the process proceeds to step S29. In step S29, the CPU 72 replaces the difference data Y1d of the luminance data that has not been determined to have imaging disturbance this time in the area d in the SDRAM 56 with the difference data Y2d of the previous luminance data.

  When the comparison of the luminance data is finished, the CPU 72 determines the alarm output. In step S41, it is determined whether or not the flag a is set. If YES, that is, if the flag a is set, the process proceeds to step S49, where the alarm output circuit 74 outputs an alarm. If NO, that is, if the flag a is not set, the process proceeds to step S43.

  In step S43, it is determined whether or not the flag b is set. If YES, that is, if the flag b is set, the process proceeds to step S49 where an alarm is output from the alarm output circuit 74. If NO, that is, if the flag b is not set, the process proceeds to step S45.

  In step S45, it is determined whether or not the flag c is set. If YES, that is, if the flag c is set, the process proceeds to step S49, where the alarm output circuit 74 outputs an alarm. If NO, that is, if the flag c is not set, the process proceeds to step S47.

  In step S47, it is determined whether or not the flag d is set. If YES, that is, if the flag d is set, the process proceeds to step S49, where an alarm is output from the alarm output circuit 74, and the process proceeds to step S50. An alarm signal is sent to a security company (not shown) by the alarm output, but the alarm signal is continuously sent until the security company resets the alarm output. If NO, that is, if the flag d is not set, the process proceeds to step S50. Therefore, when the imaging obstruction such as the spray paint is applied to the transparent cover 12 only partially, the four areas 18a, 18b, 18c, 18d of the coating area 18 and the non-coating areas 20a, 20b, 20c, When it is determined that there is an imaging disturbance even in one of the time changes between 20d, an imaging output can be improved by performing an alarm output. In step S50, the counter 73 in the CPU 72 counts for a predetermined time. When the counting is completed, the counter is reset, and the process returns to step S1 again.

  As can be seen from the above description, the transparent cover 12 is coated with a coating area 18 coated with a substance having at least water repellency or waterproofing or a paint repelling function, which is difficult for obstructions to obstruct the subject light input to the camera. Since a plurality of non-coating areas 20a, 20b, 20c, and 20d are provided at positions where obstructions are difficult to adhere and are not affected by the shooting by the camera, subject light such as spray paint is applied to the transparent cover 12. Even if an imaging obstruction such as an obstructing object is attached, it does not adhere to the coating area 18 of the transparent cover 12, so that the photographing can be continued. In addition, spray paint or the like adheres to the non-coating area 20 of the transparent cover 12. Relationship between temporal changes in luminance data of information on the coating area 18 and the non-coating areas 20a, 20d, 20c, and 20d, information on the coating area 18 in which no obstruction obstructing subject light such as spray paint adheres in this embodiment. And the non-coating areas 20a, 20b, 20c, and 20d attached thereto can be detected, and imaging disturbance can be detected, and there is no problem in subsequent imaging.

  Although one embodiment of the luminance data comparison processing and alarm output determination processing of the present invention has been described, another embodiment of luminance data comparison processing and alarm output determination processing will now be described with reference to FIG.

In addition, the structure of the monitoring apparatus 10 of another Example is equivalent to what is described in said Example (FIGS. 1-4), and a brightness | luminance data comparison process and an alarm output judgment process differ.
Specifically, all four luminance data of arbitrary four areas 18a, 18b, 18c, and 18d in the coating area 18 of the digital image data imaged in the current imaging mode are added, and the added luminance The average value obtained by dividing the data by the area, that is, the average value obtained by dividing by 4 and the four luminance data of the non-coating areas 20a, 20b, 20c, and 20d are all added, and the added luminance data is divided by 4. The difference data Yav1 between the values and the four luminance data of arbitrary four areas 18a, 18b, 18c, and 18d in the coating area 18 that was not determined to be the previous imaging disturbance are added together, and the added luminance The average value obtained by dividing the data by 4 and the four brightness data of the non-coating areas 20a, 20b, 20c, and 20d are all added, and the added brightness By comparing the difference data Yav2 between the average value obtained by dividing the over data at 4, and outputs an alarm detects imaging hampered by the amount of change.

  That is, referring to FIGS. 3 and 4, the CPU 72 inputs the luminance levels of all the pixels in the four areas 18 a, 18 b, 18 c, and 18 d in the extracted coating area 18 to the integration circuit 66 and digitally inputs them. Similarly, the luminance levels of the non-coating areas 20a, 20b, 20c, and 20d are input to the integrating circuit 66 and digitally integrated. All the integrated luminance data of the coated areas 18a, 18b, 18c, 18d are added, the average value obtained by dividing the added luminance data by 4, and the integrated non-coated areas 20a, 20b, 20c, 20d. All the data are added and compared with the average value obtained by dividing the added luminance data by 4, and difference data Yav1 of the average value of the luminance data is detected.

Next, the difference data Yav2 of the average value of the luminance data that has not been determined to be the previous imaging disturbance stored in the SDRAM 56 and the difference data Yav1 of the average value of the current luminance data are compared. In the area M in the SDRAM 56, difference data of the average value of the luminance data that has not been determined to be the previous imaging disturbance is stored. The difference data of the average value of the luminance data that has not been determined to be the previous imaging disturbance stored in the area M is compared with the difference data of the average value of the current luminance data.
The CPU 72 controls the alarm output circuit 74 to output an alarm when it is determined that the image pickup is disturbed by comparing the difference data of the average value of the luminance data.

  Hereinafter, luminance data comparison and alarm output determination will be described with reference to FIG. FIG. 7 shows difference data Yav1 between the average value of the luminance data of the four areas 18a, 18b, 18c and 18d in the coating area 18 and the average value of the luminance data of the non-coating areas 20a, 20b, 20c and 20d, and the previous time. It is a flowchart which shows the comparison process with difference data Yav2 of the average value of luminance data, and shows an alarm output. The CPU 72 executes luminance data comparison processing and alarm output determination processing.

  Referring to FIG. 7, in step S51, the CPU 72 determines that the addresses Ad07, Ad12, Ad19, Ad24 in the four areas 18a, 18b, 18c, 18d in the coating area 18 from the area A2 in the hard disk recorder 70 are non- The addresses Ad08, Ad11, Ad20, and Ad23 of the coating areas 20a, 20b, 20c, and 20d are extracted, and the luminance levels of all the pixels in the corresponding area are extracted from the digital image data captured in the current imaging mode stored in the SDRAM 56. . Specifically, in step S51a, the address Ad08 corresponding to the non-coating area 20a is extracted from the memory A2 in the hard disk recorder 70, and the luminance levels of all the pixels in the area 20a are extracted from the image temporarily stored in the SDRAM 56. The signal is input to the integration circuit 66, digital integration is performed, and luminance data is detected.

  Similarly, in step S51b, the address Ad11 corresponding to the non-coating area 20b is extracted, the luminance levels of all the pixels in the area 20b are extracted, input to the integrating circuit 66, digitally integrated, and luminance data is detected. In step S51c, the address Ad20 corresponding to the non-coating area 20c is extracted, the luminance levels of all the pixels in the area 20c are extracted, input to the integrating circuit 66, digitally integrated, and luminance data is detected. In step S51d, the address Ad23 corresponding to the non-coating area 20d is extracted, the luminance levels of all the pixels in the area 20d are extracted, input to the integrating circuit 66, digitally integrated, and the luminance data is detected. If each luminance data detection is completed in step S51, the process proceeds to step S53.

  In step S53, the CPU 72 adds all the luminance data of the areas 18a, 18b, 18c, 18d in the coating area 18, and the average value obtained by dividing the added luminance data by 4 and the non-coating areas 20a, 20b, 20c. , 20d are all added, an average value obtained by dividing the added luminance data by 4 is calculated, and the process proceeds to step S55.

  In step S55, the CPU 72 stores the difference data between the average value of the brightness data of the coating areas 18a to 18d stored in the SDRAM area M and not determined as the previous imaging disturbance and the average value of the brightness data of the non-coating areas 20a to 20d. The amount of change in difference data Yav1 between Yav2, the average value of the luminance data of the coating areas 18a to 18d and the average value of the non-coating areas 20a to 20d is detected, and the process proceeds to step S57.

  In step S57, the CPU 72 determines whether or not the amount of change between Yav2 and Yav1 detected in step S55 is equal to or greater than a predetermined value T stored in the hard disk recorder 70.

  If YES in step S57, that is, if the amount of change between Yav2 and Yav1 is equal to or greater than the predetermined value T, the process proceeds to step S59, and the CPU 72 outputs an alarm from the alarm output circuit 74. An alarm signal is sent to a security company (not shown) by the alarm output, but the alarm signal is continuously sent until the security company resets the alarm output. If NO in step S57, that is, if the amount of change between Yav2 and Yav1 is less than the predetermined value T, the process proceeds to step S61.

  In step S61, the average value difference data Yav2 that has not been determined to be the previous imaging disturbance stored in the area M in the SDRAM 56 is replaced with the average value difference data Yav1 that has not been determined to be the current imaging disturbance.

  In step S63, the counter 73 in the CPU 72 counts for a predetermined time. When the predetermined time is counted, the counter is reset, and the process returns to step S51 again.

  In this embodiment, the antifouling coating is applied to the transparent cover 12, and the coating area 18 and the non-coating areas 20a, 20b, 20c, and 20d are provided. However, the transparent cover 12 is not provided, and the lens of the camera unit 14 is directly provided. The surface of the lens of the portion 16 is provided with an antifouling coating that acts to be water repellent, waterproof, or repels paint, and a coating area 18 and a plurality of non-coating areas 20 are provided for imaging, and the transparent cover 12 is provided. You may make it perform the imaging disturbance process similar to the time.

  Furthermore, in the present embodiment, the digital luminance level is compared when the imaging disturbance determination is made, but the comparison may be made with an analog luminance level.

  Further, in this embodiment, the imaging data is digitally recorded in the hard disk recorder 70 when the imaging operation is performed, but may be recorded in an analog VTR or the like.

  Needless to say, the processing unit, the recording unit, and the alarm processing unit may be integrated with the camera.

It is the block diagram which showed the monitoring apparatus which is one Example of this invention. It is an illustration figure which shows an example of the transparent cover of the monitoring apparatus which is one Example of this invention. It is an illustration figure which shows an example of the imaging area of the monitoring apparatus which is one Example of this invention. It is a block diagram which shows the structure of FIG. 1 Example which is one Example of this invention. It is a flowchart which shows a part of operation | movement of FIG. 1 Example which is one Example of this invention. It is a flowchart which shows a part of other operation | movement of FIG. 1 Example which is one Example of this invention. It is a flowchart which shows a part of operation | movement of the other Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Monitoring apparatus 12 ... Transparent cover 14 ... Camera 16 ... Lens part 18 ... Coating area 20 ... Non-coating area 56 ... SDRAM
66 ... Integral circuit 72 ... CPU
73 ... Counter

Claims (14)

In a monitoring device that detects that an image is captured by a camera,
A camera,
A cover provided with a first area where obstructions that obstruct the subject light input to the camera are less likely to adhere and a second area that is not,
Comparing and detecting means for detecting imaging disturbance by comparing a temporal change relationship of information from the first area and the second area among images from the camera imaged through the cover. A monitoring device characterized by. 2. The monitoring apparatus according to claim 1, wherein the first area is an area coated with a substance having at least water repellency, water proofing, or a paint repelling action. The comparison detection unit detects an imaging disturbance by comparing a temporal change relationship of a luminance level as information from the first area and the second area. The monitoring device described. 4. The monitoring apparatus according to claim 1, wherein the second area is provided on the cover at a position not affected by photographing of a subject by the camera. 5. The monitoring apparatus according to claim 1, wherein a plurality of the second areas are provided on the cover. In a monitoring device that detects that the camera has interfered with imaging,
A camera,
A lens provided with a first area in which obstructions that obstruct subject light input to the camera are less likely to adhere, and a second area that is not,
Comparing and detecting means for detecting an imaging disturbance by comparing a temporal change relationship of information from the first area and the second area among images from the camera imaged through the lens A monitoring device characterized by. 7. The monitoring apparatus according to claim 6, wherein the first area is an area coated with a substance having at least water repellency, waterproofing, or paint repelling action. The monitoring device according to claim 6, wherein the comparison detection unit detects an imaging disturbance by comparing luminance levels as information from the first area and the second area. 9. The monitoring device according to claim 6, wherein the second area is provided at a position where the lens is not affected by photographing by the camera. The monitoring device according to claim 6, wherein a plurality of the second areas are provided in the lens. In a monitoring method for detecting that an image is captured by a camera,
Of the images from the camera taken through a cover or lens provided with a first area where obstructions that obstruct subject light input to the camera are difficult to adhere and a second area that is not so, the first area And a temporal change of information from the second area are compared to detect an imaging disturbance. In a monitoring method for detecting that an image is captured by a camera,
Of the images from the camera taken through a cover or lens provided with a first area where obstructions that obstruct subject light input to the camera are less likely to adhere and second areas that are not, the first area And an imaging disturbance is detected by comparing the relationship of temporal change in luminance level as information from the second area. 13. The monitoring method according to claim 11, wherein the second area is an area coated with a substance having at least a water repellent property, a waterproof property, or a paint repelling action. The monitoring method according to claim 11, wherein the second area is provided at a position on the cover or the lens that is not affected by an image of a subject by the camera.