JP2006228636A - Illuminating lamp deterioration detecting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect the deterioration in an illuminating lamp by image data on the illuminating lamp imaged by a camera. <P>SOLUTION: This illuminating lamp deterioration detecting device has the camera 1 for imaging the illuminating lamp, a totalizing means 32 for totalizing luminance of image data provided by the camera 1 with respective fields of an image signal, a comparing means 33 for comparing predetermined luminance data with luminance data provided by the totalizing means 32 at a present point, and a deterioration determining part 4 for determining that the illuminating lamp is deteriorated when the comparing means 33 detects that a difference is a predetermined value or more. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an illumination lamp deterioration device that detects deterioration of an illumination lamp installed on, for example, a road or a tunnel.

  For illumination of roads and tunnels, discharge lighting lamps such as mercury lamps, low-pressure sodium lamps, and fluorescent lamps are often used. The replacement of these lamps often requires traffic regulation, and the implementation time is limited. Therefore, preventive maintenance before lighting is important is important.

Conventionally, as a device for detecting non-lighting of a lamp or a device for detecting deterioration, many are performed using a sensor. For example, there is a device disclosed in Patent Document 1.
JP 2003-202263 A

  On the other hand, in the road monitoring system, if an image is obtained by a CCTV camera and the deterioration of the illumination lamp can be detected using this image, it is not necessary to provide equipment such as a sensor.

  The present invention makes it possible to detect deterioration of an illumination lamp using image data of the illumination lamp imaged by a camera.

  An illumination lamp deterioration detection device according to the present invention includes a camera that captures an illumination lamp, a summing unit that sums up the brightness of image data obtained by the camera for each field of an image signal, and a predetermined brightness. Comparing means for comparing data with luminance data obtained by the totaling means, and determining means for determining that the illumination lamp has deteriorated when the difference is detected by the comparing means to be not less than a predetermined value. It is characterized by doing.

  An illumination lamp deterioration detection apparatus according to the present invention includes a camera that captures an illumination lamp, a summing unit that sums up the luminance of image data obtained by the camera for each field of an image signal, and a summing unit that sums up the luminance. A change detecting means for obtaining a periodic change in the incident light amount distribution based on the luminance data, and a determining means for determining that the illumination lamp has deteriorated when a predetermined periodicity is detected in the data obtained by the change detecting means. It is characterized by comprising.

  In the illumination lamp deterioration detection apparatus according to the present invention, the determination means performs the deterioration determination based on the peak position of the light amount in each field.

  In the illumination lamp deterioration detection apparatus according to the present invention, the determination means performs the deterioration determination based on the frequency distribution of the light quantity in each field.

  The illumination lamp deterioration detecting apparatus according to the present invention is characterized in that a part of the image data captured by the camera is masked and processing is performed on the brightness of the image data.

  In the illumination lamp deterioration detection device according to the present invention, the image data is summed up for each field of the image signal, and the deterioration is determined by comparing the predetermined luminance data with the luminance data obtained by the collecting means. It is possible to detect lamp deterioration appropriately based on the data.

  In the illumination lamp deterioration detection device according to the present invention, the periodic change of the incident light amount distribution is obtained based on the luminance data collected for each field, and the obtained normal data and current data of the illumination lamp are obtained. Since deterioration is determined by comparison, it is possible to appropriately detect lamp deterioration based on image data.

  In the present invention, a function of detecting deterioration of a lamp easily and with high accuracy is realized by imaging a target illumination lamp or an object irradiated by the lamp with a video camera and evaluating luminance data between fields. Embodiments of an illumination lamp deterioration detection apparatus according to the present invention will be described below with reference to the accompanying drawings. In the drawings, the same components are denoted by the same reference numerals and redundant description is omitted.

  FIG. 1 shows a configuration diagram of a first embodiment of the illumination lamp deterioration detection apparatus. A video camera 1 is provided so as to image the illumination lamp of the road light 2. The image signal obtained by the video camera 1 is, for example, of the NTSC system and is sent to the luminance evaluation unit 3 where it is converted to digital image data that can be processed by a computer.

  In the above, the image signal obtained by imaging the tube of the illumination lamp is converted into digital luminance data (image data) by the image conversion means 31. When the illumination lamp driven at 50 Hz is normal, for example, the luminance data changes as shown in FIG. The deterioration of the illumination lamp is often due to the wear of the electrode material applied to the electrode, and usually the wear of one electrode material becomes severe with time, resulting in a half-wave lighting state shown in FIG. At this time, the luminance data changes as shown in FIG.

  When the illumination lamp is driven at a frequency of 50 Hz and is picked up by the video camera 1 of the NTSC system (60 fields / second), flicker occurs. Therefore, a 100 Hz electronic shutter is used to remove the flicker. When this is used, the luminance data after the conversion by the image conversion means 31 (the integrated value becomes the incident light amount) changes as shown in FIG. 3C, and flicker is not observed. . FIG. 3A shows the luminance change of the illumination lamp, and FIG. 3B shows the opening / closing timing of the electronic shutter. As described above, the luminance data of the image data obtained by the video camera 1 is provided with a totaling unit 32 that totals each field of the NTSC image signal. Then, the collecting means 32 obtains the integrated value (incident light amount) of the luminance data for each field (n, n + 1, n + 2,...). When the illumination lamp is normally lit, As shown in FIG. 3C, the incident light quantity is an integral value corresponding to a half cycle of the sine wave, and is constant.

  On the other hand, in the half-wave lighting state described with reference to FIG. 2B, the change in luminance data in the illumination lamp is as shown in FIG. 4A, and the opening / closing timing of the electronic shutter is shown in FIG. As shown in FIG. 4B, the output of the processing result by the image conversion means 31 and the totaling means 32 becomes an integrated value of the waveform indicated by the solid line in FIG. In this case, it can be seen that the integrated value of the luminance data for each field (n, n + 1, n + 2,...) Is not constant but periodically changes.

  Regarding the integrated value of the luminance data, which is the processing result of the image conversion means 31 and the totaling means 32, data obtained by the totaling means 32 in advance when the illumination lamp is normal (the integral value of the luminance data), data obtained at the present time Comparing means 33 for comparing (with the integrated value of the luminance data) is provided in the luminance evaluation section 3. The luminance evaluation unit 3 holds a value when the illumination lamp is normal (when the illumination lamp is attached or replaced). The comparison result by the luminance evaluation unit 3 is sent to the deterioration determination unit 4.

  When the comparison result is equal to or greater than a predetermined value, the deterioration determination unit 4 determines that the illumination lamp has deteriorated and issues an alarm notification. Specifically, for each field, the difference data of the comparison result is compared with a predetermined threshold value (for example, 40% of normal time), and an alarm notification is issued when a value lower than a predetermined threshold value is reached. Do. In another embodiment, the integrated value of the luminance data is totaled by the totaling means 32 for each predetermined number of fields (5 fields in the example in FIG. 4) in which periodicity appears, and the comparison means 33 calculates the normal time and the current time. Compare each value in. Also in this case, the deterioration determination unit 4 as a determination unit performs alarm notification when the output of the luminance evaluation unit 3 becomes a value lower than a threshold value. According to the embodiment described above, it is possible to appropriately detect lamp deterioration using an image obtained from the video camera 1.

  When the driving frequency of the illumination lamp is 60 Hz and the video image signal is 60 Hz / sec, the brightness of the adjacent field in the image signal when the illumination lamp is normally lit regardless of whether the electronic shutter is used or not. The integrated values of the data are equal. On the other hand, when the illumination lamp is deteriorated, the luminance change of the illumination lamp alternately corresponds to repeated lighting and non-lighting, as shown in FIG. There are scenes in which the integrated values of the luminance data of are different. In other words, when the driving frequency of the illumination lamp is 60 Hz, the video image signal has a larger error than 60 Hz / sec. There are times when the presence / absence of incident light is repeated. As shown in FIG. 5B, even if the incident light quantity does not repeat existence / non-existence accurately for each field, a state close to this occurs.

  Therefore, the deterioration determination unit 4 determines that the illumination lamp has deteriorated and issues an alarm notification when the comparison result by the comparison unit 33 is equal to or greater than a predetermined value. Specifically, for each field, the difference data of the comparison result is compared with a predetermined threshold value (for example, 40% of normal time), and an alarm notification is issued when a value lower than a predetermined threshold value is reached. Do. Thus, even when the driving frequency of the illumination lamp is 60 Hz and the video image signal is 60 Hz / sec, it is possible to appropriately detect lamp deterioration using the image obtained from the video camera 1.

  FIG. 6 shows a configuration diagram of a second embodiment of the illumination lamp deterioration detection apparatus. In this embodiment, the change detection means 33A provided in the luminance evaluation section 3A and the deterioration determination section 4A as the determination means are replaced with the change detection means 33 provided in the luminance evaluation section 3 and the deterioration determination in the first embodiment. It is different from the part 4. The change detection means 33A obtains a periodic change in the incident light amount distribution based on the luminance data aggregated by the aggregation means 32. The deterioration determination unit 4A determines that the illumination lamp has deteriorated when a predetermined periodicity is detected in the data obtained by the change detection means 33A.

  The change detection means 33A obtains the peak position of the light amount for each field based on the luminance data. For example, the change from the normal lighting as already shown in FIG. 3 to the half-wave lighting state shown in FIG. 4 does not necessarily occur suddenly. For example, as shown in FIG. There may be a case where a state in which 50% lighting is generated every other lighting occurs compared to the luminance of the other. Further, as shown in FIG. 7, the 50% lighting state does not always occur regularly. Furthermore, the lighting and non-lighting states do not always occur alternately and regularly.

  Therefore, the change detection unit 33A obtains an integral value for each field of the luminance data, and as a light amount data (incident light amount), a predetermined field cycle (since the illumination lamp is driven at 50 Hz, a cycle of 10 Hz). It accumulates with. As a result, if the illumination lamp is normal, the peak positions of the light amounts for each field indicated by n + 1, n + 2, n + 3, n + 4, and n + 5 are one point and the positions coincide with each other, but sometimes the state of FIG. 4 occurs. 7 or when the state shown in FIG. 7 occurs, the light quantity for each field accumulated in a predetermined field period (here, 5 field periods because of 10 Hz), as shown in FIG. 8, occurs at two or more peak positions. . The change detection means 33A that has obtained the accumulated data in this way sends it to the deterioration determination unit 4A.

  The deterioration determination unit 4A analyzes the data sent from the change detection means 33A, and determines that the illumination lamp has deteriorated when it detects that the peak positions of the light amount for each field of the predetermined field period occur at two or more locations. Alarm notification. Alternatively, the deterioration determination unit 4A may change the peak position of the light amount to the second position P2 on the periodic curve by periodically changing the peak position of the light amount in addition to the peak in which the light amount peak position is linearly aligned with the first position P1. When it is detected that the peaks are lined up, it is determined that the illumination lamp has deteriorated, and an alarm is notified.

  Similar to the second embodiment, in the third embodiment including the means shown in FIG. 6, the change detecting means 33A and the deterioration determining unit 4A have a configuration for performing the following operation. The change detection means 33A obtains a frequency distribution of the amount of light in each field based on the luminance data. In the case of the normal lighting state as shown in FIG. 3 already described, the frequency distribution of the light quantity, which is a value obtained by integrating the luminance data, has one large peak as shown by the broken line in FIG. Concentrate near this peak. On the other hand, in the half-wave lighting state as shown in FIG. 4, one peak is low as shown by the solid line in FIG. 9, and is gently distributed from this peak toward the lower light quantity. In this way, the change detection unit 33A obtains the frequency distribution of the light amount, and sends the obtained data to the deterioration determination unit 4A.

  The degradation determination unit 4A analyzes the frequency distribution data sent from the change detection means 33A, and has a peak lower than the peak in the case of normal lighting as shown by the solid line in FIG. When data of a frequency distribution that gradually spreads in the direction is detected, it is determined that the illumination lamp has deteriorated, and an alarm is notified.

  In the fourth embodiment, as shown in FIG. 10, the configuration of the second embodiment or the third embodiment is added to the first embodiment. That is, the deterioration determination unit 4 corresponds to the first example, and receives the output of the comparison unit 33 in the luminance evaluation unit 3B and performs the deterioration determination in the same manner as in the first example. On the other hand, the deterioration determination unit 4A corresponds to the second example or the third example, and receives the output of the change detection means 33A in the luminance evaluation unit 3B, and is similar to the second example or the third example. The deterioration is judged. Then, when the general determination unit 5 takes in the outputs of the deterioration determination units 4 and 4A and the alarm notification is output from both the deterioration determination units 4 and 4A, the general determination unit 5 performs the alarm notification. The configuration of each component is equal to that described in the first embodiment, the second embodiment, and the third embodiment. As a result, a strict determination is made, and highly accurate deterioration detection becomes possible. Further, when the alarm notification is output from one of the deterioration determination units 4 and 4A, if the general determination unit 5 performs the alarm notification, the deterioration can be detected at an early stage.

  In addition, as is common in any of the embodiments, when the illumination lamps of a plurality of road lights 2 are imaged when the video camera 1 images the illumination lamps of the road lights 2, the luminance evaluation unit 3, 3A is provided with a mask processing unit so as to obtain luminance data for one required illumination lamp. For example, only luminance data corresponding to any pixel of the digitized data is captured and processed. By performing such processing, when the illumination lamps of the road lights 2 are imaged by the video camera 1, the illumination lamps can be appropriately detected even when the illumination lamps of the plurality of road lights 2 are imaged.

The block diagram which shows the structure of the illumination lamp degradation detection apparatus which concerns on 1st Example of this invention. The figure which shows the luminance change at the time of the normal lighting in an illumination lamp, and the luminance change in the lighting state when an illumination lamp deteriorates. The wave form diagram which shows progress of the process by the illumination lamp degradation detection apparatus which concerns on the Example of this invention about the time of normal lighting in an illumination lamp. The wave form diagram which shows progress of the process by the illumination lamp degradation detection apparatus which concerns on the Example of this invention about the lighting state at the time of degradation in an illumination lamp. The wave form diagram which shows progress of the process by the illumination lamp degradation detection apparatus which concerns on the Example of this invention about the illumination lamp driven by 60 Hz. The block diagram which shows the structure of the illumination lamp degradation detection apparatus which concerns on 2nd Example of this invention, and 3rd Example. The wave form diagram which shows progress of the process by the illumination lamp degradation detection apparatus which concerns on the Example of this invention about the lighting state at the time of degradation in an illumination lamp. The figure which shows progress of the process by the illumination lamp degradation detection apparatus which concerns on the 2nd Example of this invention about an illumination lamp. The figure which shows progress of the process by the illumination lamp degradation detection apparatus which concerns on the 3rd Example of this invention about an illumination lamp. The block diagram which shows the structure of the illumination lamp degradation detection apparatus which concerns on the 4th Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Video camera 2 Road light 3, 3A, 3B Luminance evaluation part 4, 4A Degradation determination part 5 General determination part 31 Image conversion means 32 Total means 33 Comparison means 33A Change detection means

Claims (5)

A camera that images the illumination lamp;
Aggregating means for calculating the luminance of image data obtained by the camera for each field of the image signal;
Comparison means for comparing predetermined brightness data with brightness data obtained by the counting means;
An illumination lamp deterioration detection apparatus comprising: a determination unit that determines that the illumination lamp has deteriorated when the comparison unit detects that the difference is equal to or greater than a predetermined value. A camera that images the illumination lamp;
Aggregating means for calculating the luminance of image data obtained by the camera for each field of the image signal;
Change detecting means for obtaining a periodic change of the incident light amount distribution based on the luminance data tabulated by the tabulating means;
An illumination lamp deterioration detection apparatus comprising: a determination unit that determines that the illumination lamp has deteriorated when a predetermined periodicity is detected in the data obtained by the change detection unit. 3. The illumination lamp deterioration detection apparatus according to claim 2, wherein the determination unit performs the deterioration determination based on a peak position of the light amount in each field. 3. The illumination lamp deterioration detection apparatus according to claim 2, wherein the determination unit performs deterioration determination based on a frequency distribution of light quantity in each field. 5. The illumination lamp deterioration detection apparatus according to claim 1, wherein a part of image data captured by the camera is masked to perform processing on luminance of the image data. 6.

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