JP2004279317A - Painting management system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To build a painting management system for quantitatively grasping the degree of degradation of paint films, such as rust generated in large structures and plants comprising painted steel products, peeling of the paint films, etc. using a convenient and simple method and comprehensively and accurately determining the time for implementing repair painting, and implementation of appropriate painting work and carrying out them. <P>SOLUTION: The system is provided with the following steps and manages conditions of one or more painted areas in the large structures and the plants constituted of the painted steel products. In step (1), a digital picture of a fixed point observation part in the structure or the plant is photographed at regular intervals, along with a white color sample. In step (2), the digital image is captured by a computer having an image processing function and is analyzed after an image adjustment using a color tone correction menu, and a paint degradation area ratio of the fixed point observation part is found. In step (3), the time for implementing repair painting of the structure or the plant is managed, based on the paint degradation area ratio of the fixed point observation part. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention comprehensively and systematically manages the maintenance and management of large structures and plant equipment composed mainly of a plurality of painted steel materials in factories, municipalities, etc., and particularly the management of coating peeling and corrosion. A paint management system to perform. In addition, the present invention is particularly useful in managing the coating state of structures and plant facilities having many and complicated shapes over a wide area.
[0002]
[Prior art]
Conventionally, at the time of repair painting of large structures and plant equipment at various factories and local governments, inspectors visually determine the degree of paint deterioration and the degree of occurrence of peeling rust for individual equipment. After that, a plan was made in consideration of past repair painting results, etc., and the repair painting was carried out sequentially.
[0003]
However, these conventional methods are visual judgments of individual structures and facilities by different inspectors, and are not quantitative, so that their evaluations vary. In particular, when the number of the facilities to be managed increases or the distribution of the facilities to be managed spreads over a wide area, the variation in the evaluation becomes even greater. Then, among many structures and equipments, the priority given by the urgency of the repair may not be accurately determined, and in the worst case, some facilities may miss the limit of the repair time.
[0004]
In this way, even if the number of structures and equipment to be managed is large, and even if the distribution is wide, the repair necessity of the equipment etc. can be grasped as accurately as possible as a whole, and comprehensive, planned, There is a great need for a paint management system that can carry out an accurate repair execution plan.
[0005]
As a method of accurately and in detail diagnosing coating deterioration of painted steel materials, a steel material and a color sample are photographed at the same time, the photographed image is taken into a computer equipped with an image processing function, and color information of the corroded part is analyzed by color image analysis ( Corrosion points (thin rust, red rust, iron rust, etc.) are detected and the corrosion state is determined from the lightness, saturation, hue, etc. of the color, and the coating state is determined by general image processing (blowing, cracking, peeling, etc.). ) Is detected and the state of coating film defects is determined, and the degree of deterioration of the coating is evaluated from the results of these determinations (see Patent Document 1).
[0006]
This diagnostic method requires that a plurality of color samples to be photographed simultaneously with the steel material be selected for the target, and furthermore, the color image processing and analysis comprise a plurality of steps requiring specialized knowledge. In other words, it can be said that this is a highly accurate diagnosis method that requires specialized knowledge, time and time, and is particularly suitable for a small number of diagnosis targets requiring detailed analysis.
However, a coating management system for large, multi-area, or complex structures with a large number of observation points can be easily implemented even by a large number of workers who do not have specialized knowledge. Therefore, the method for diagnosing coating deterioration described in Patent Document 1 which requires specialty and lacks simplicity is not suitable for use in such a coating management system.
[0007]
[Patent Document 1]
JP 2001-266121 A
[Problems to be solved by the invention]
In view of the above-mentioned circumstances, an object of the present invention is to provide a large, wide-area or complicated structure, rusting of a large structure or plant equipment composed of painted steel material, rusting of a coating film, peeling of the coating film, and the like. The purpose of this is to establish a painting management system that can quantitatively grasp the extent of repair by a simple method, determine comprehensively and accurately the time to carry out repair painting and determine whether to perform appropriate painting work, and execute it. .
[0009]
[Means for Solving the Problems]
The present inventors have conducted various studies to achieve the above object, and as a result of performing multiple, wide-area or complicated structures, large-scale structures, and the like, in order to perform coating management of plant facilities, the structure and the like were periodically checked. Perform fixed point observation; and take a digital photograph of the fixed point, and use a simple and accurate image analysis method to quantify the degree of deterioration of the coated film, such as rusting of the coated steel and peeling of the coated film. The present invention finds that it is possible to construct a coating management system capable of comprehensively, accurately and systematically performing coating management of large-scale structures and the like having a plurality of, wide-area or complex structures. Was completed.
[0010]
That is, the present invention provides the following steps:
(1) Periodically take a digital photograph of a fixed-point observation part of a structure or equipment together with a white color sample; (2) Take the digital image into a computer equipped with an image processing function and use the color correction menu to perform image processing After the adjustment, image analysis is performed to determine the coating deterioration area ratio at the fixed-point observation part; (3) Based on the coating deterioration area ratio at the fixed-point observation part, the time of repair painting of the structure or equipment is determined. The present invention provides a system for managing the painting state of one or more areas of a large structure or plant equipment composed of painted steel materials.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a system for managing the coating state of a large structure or plant equipment according to the present invention will be described in detail.
[0012]
As a premise of applying the coating state management system of the present invention, first, the factory, a local government, or the like, which is subject to maintenance management, generation of rust, peeling of the coating, etc. Large structures and plant facilities mainly composed of steel are listed.
Then, for each of these large structures and plant facilities, one or more fixed-point observation portions suitable for observing the coating state over time, for example, locations where coating deterioration is likely to occur are set.
For these fixed-point observation parts, the following steps are performed to periodically observe the state of coating deterioration.
[0013]
(1) Periodically take a digital photograph of a fixed-point observation part of a structure or equipment with a white color sample;
In the method of quantifying the degree of coating deterioration in the present invention, a digital photograph is taken of an observed portion, taken into a computer, and image analysis is performed. However, it is necessary to accurately detect a deteriorated portion such as rust color from the digital photograph.
However, even in the same subject, the color of the color photograph changes depending on the environment such as weather, time, and backlight. In such a color photograph, it is very difficult to determine which is the threshold value for a deteriorated portion such as rust color in the image analysis processing.
Accordingly, in the present invention, a digital photograph of a fixed point observation part is taken together with a white color sample, and at the time of image analysis processing, the color tone is corrected based on the white of the sample taken in the color photograph as a reference, so that the weather and other photographing environments We decided to eliminate the effects as much as possible.
[0014]
In the detailed diagnosis method of paint deterioration described in Patent Document 1, in order to remove the influence of the photographing environment and accurately determine a rusted portion or the like, a plurality of color samples suitable for the color of the subject are simultaneously photographed together with the diagnostic subject. Shoot. However, as will be described later, the process of the image analysis process becomes complicated, requiring specialized knowledge and skill, and performing coating management of a plurality of, wide-area or complex structures, etc. which are the object of the present invention. Is not appropriate.
Even in the case of imprinting only the white color sample of the present invention, if the color tone adjustment for making the white color sample portion the original white is performed using a computer having an image color tone adjustment function, the image analysis process can be performed. In the above, it is possible to remove the influence of the photographing environment such as the weather to a practically sufficient degree.
[0015]
It should be noted that even though the influence of the photographing environment can be considerably removed in the image analysis processing step by imprinting the white color sample, it is desirable to remove the influence of the photographing environment as much as possible at the time of photographing.
In order to take a photograph suitable for such image analysis, it is preferable to set the digital camera as follows.
"White balance": not automatic, but set according to the weather, such as sunny or cloudy. (Shooting of a part with a small amount of light, such as in a plant, is set to cloudy; sunny is set in the morning and evening reddish rays.)
"Photometry": A spot is selected instead of ESP (global photometry), and the part to be photographed is set at the center of the photograph.
"Exposure correction": generally select 0 (-0.5 or -1 when in direct sunlight; +0.5 or +1 in cloudy, rainy, or dark places).
[0016]
(2) The digital image is taken into a computer having an image processing function, image adjustment is performed using a color tone correction menu, image analysis is performed, and a coating deterioration area ratio of a fixed point observation portion is obtained;
An image of a digital photograph taken of a fixed point observation part together with a white color sample is taken into a computer having an image processing function. By adjusting the color tone so that the white color sample part becomes white using the tone correction menu of general PC software, the overall color tone can be adjusted accordingly, so the influence of the shooting environment Is removed, and a photograph of the same portion with different shooting time and different weather can be made a photograph of the same color tone.
[0017]
The image adjustment is specifically performed as follows.
The R (red), G (green), and B (blue) density measurements are performed on the white portion using image analysis software. Next, the color tone is adjusted by the color tone correction menu so that each measured value becomes R; 255, G; 255, B; 255, which are the basic density characteristics of the white portion.
The method of the present invention in which only a white color sample is captured has the advantage that the correction work at the time of this image adjustment is extremely simple and does not require special expertise.
[0018]
The subsequent image analysis is specifically performed as follows.
Open the image-adjusted file and set the measurement range by dragging with the pointer. A color extraction function that extracts a specific color part in the measurement range, and sets upper and lower threshold values of H (hue), L (brightness), and C (saturation) of a color exhibiting characteristics such as rust. By executing, a color portion having a value within a threshold range is extracted.
The area ratio of the extracted rust or the like with respect to the area of the measurement range is measured by the area measurement function of the image analysis software to calculate the area ratio of the coating film deterioration.
The threshold range to be set depends on the peeling of the coating film (before rust generation or simultaneously with rust generation), rust generation, and even rust, light rust, red rust, and black rust. By setting threshold ranges corresponding to the respective ranges and determining the respective area ratios, the degree of progress of the coating deterioration can be determined.
[0019]
In the coating management system of the present invention, an extremely large number of fixed-point observation portions are often targeted, and the main purpose is to perform prioritization of repair-required portions by periodic and continuous observation and to manage the repair time limit. . For this purpose, it is desirable that the index of the coating film deterioration area at the first measurement point be as small as possible, and if possible, one index having high quantitativeness and high accuracy be used as the control value.
The threshold range (preferably one) of the deterioration state in which the coating film deterioration area index should be set depends on the condition of the structure / equipment to be managed. In cases where the initial deterioration and aesthetics of the coating are important, it is preferable to control the coating mainly for peeling and thin rust. In the case where the repair target at the time when the corrosion does not progress to such an extent that the corrosion does not progress is set as a management target, the management with red rust or black rust (or one threshold range including them) is preferable.
[0020]
(3) managing the time of repair painting of a structure or equipment based on the coating film deterioration area ratio of the fixed point observation part;
Based on the film deterioration area ratio of the fixed point observation part obtained as described above, the time of repair painting of a structure or equipment is continuously managed. In other words, the priority of repairs and the like are clarified from the structure or equipment list including the coating film deterioration area ratio at the fixed point observation portion, and a comprehensive, medium- to long-term repair plan can be formulated.
And since it is continuous fixed-point observation, it can respond to change of a priority etc.
Further, since the original image data is stored in an electronic file, accumulation and storage are easy, and if necessary, a more detailed analysis of the deterioration state of the original image data is possible. In addition, a comprehensive coating management system can be constructed that can exchange and view data over a wide area because of electronic file storage.
[0021]
【The invention's effect】
According to the method of the present invention, a fixed point observation portion of a structure or equipment is periodically subjected to digital photography with a white color sample and subjected to a simple image analysis process, thereby generating rust and coating. Obtain a quantitative value for the degree of coating deterioration such as peeling. Using this numerical value and the electronic file of the stored image data, comprehensively, systematically and continuously perform the maintenance management of the coating condition of large-scale structures and plant facilities with multiple, wide-area or complex structures. I can go.

Claims (1)

A system for managing the painting condition of one or more areas of a large structure or plant equipment composed of painted steel, comprising the following steps:
(1) Periodically take a digital photograph of a fixed-point observation part of a structure or equipment together with a white color sample; (2) Take the digital image into a computer equipped with an image processing function and use the color correction menu to perform image processing After the adjustment, image analysis is performed to determine the paint deterioration area rate at the fixed point observation part; (3) The time of repair painting of the structure or equipment is managed based on the paint deterioration area rate at the fixed point observation part. .