KR20000009393A - Image readout and processing device of radiography film - Google Patents

Abstract

PURPOSE: An image readout and processing device of radiography film is provided to rapidly and accurately analyze and decide a film by using a computer. CONSTITUTION: The present invention discloses an image readout and processing device of radiography film is consisted of an image acquisition unit(1), an image pre-processing unit(2), an image division unit(3), an image readout unit(4), a result output unit(5) and a data managing unit(6). In non-destructive test, an image on a developed radiography film(7) is acquired from the image acquisition unit(1) and enhanced in the image pre-processing unit(2) by a program being executed in a contrast stretching method, a gray-level slicing method, a histogram equalization method and a noise detection method. In the image division unit(3) and image readout unit(4) which divide prescribed portion and readout images by using a program executed in a edge detection method and a boundary detection method, data transmitted from the image division unit(3) are analyzed and decided by the operation by a program executed in a patterns and pattern classes sorting method and a neural networks method, and the results are output to the result output unit(5) and stored, reproduced and detected in the data managing unit(6).

Description

Image Reader and Image Processor of Radiation Film

Radiation film obtained by X-ray or γ-ray irradiation during nondestructive examination to inspect internal defects in welding parts between members of steel plates or other structures in general industrial steel works. ) Is placed on the film reader and visually judges whether it is defective according to the relevant inspection standard.It depends on the subjective judgment such as the experience of the tester.There is a lack of objectivity for the judgment result and it takes a lot of time to read. It is an obstacle to smooth working process. The present invention processes and affirms the objection judgment quickly and objectively by using a program that converts the acquired film into digitalized data and inputs an inspection pass standard corresponding to an applicable standard. Its purpose is to make it possible to store and output the data, to minimize the conventional problems and to give fairness to the non-destructive test, which is an industrial foundation, and to improve quality and shorten the process.

A non-destructive inspection auxiliary inspection machine that reads radiographic films acquired and developed by irradiation when analyzing materials for determination of physical properties such as welding sites or internal defects of materials. In this case, the inspector chooses to visually determine the presence of defects and to make an agreement.

A digital program that digitalizes a film image in the acquired radiographic film reading and analyzes the image quickly and compares and judges the applied inspection criteria and quantitatively outputs and stores the result. It is an invention that enables objective data management.

1 is a system diagram of the main components of the present invention (System diagram)

2 is a basic conceptual view of the present invention

Figure 3 is a flow chart of the image reading of the radiographic film photographing the welding site

* Explanation of symbols for main parts of the drawings

1: image acquisition unit

1-1: Film Automatic Feeding Device

1-2: image acquisition device 1-3: light source

2: Image pre-processing unit

3: Image partition / segmentation unit

4: Image reading unit

5: result output unit

5-1: Monitor 5-2: Printer

6: Data management unit 7: Radiographic film (Film)

8: Film Data Input

The present invention mainly consists of an image acquisition unit (1), an image preprocessing unit (2), an image division unit (3), an image reading unit (4), a result output unit (5), and a data management unit (6).

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

The image acquisition unit 1 is an image acquisition unit 1-1 including a film automatic supply device 1-1 for feeding the obtained radiographic film 7 and a scanner or a digital camera 1-2. And shaded light transmitted through the radiographic film 7 by constantly setting and irradiating the illuminance of the light source 1-3 positioned under the radiographic film 7. An image is acquired by the image acquisition device 1-2. The image preprocessing unit 2 is a device for improving the image obtained by the image acquisition unit 1, and the contrast stretching method (Contrast) by facilitating the analysis of the image by the naked eye of a computer and a human in reading the radiographic film (7). image enhancement method using stretching method, gray-level slicing method, histogram equalization method, and noise detection method. In addition, the image segmentation unit 3 divides the entire acquired image into a specific part to be inspected, that is, a welded part, a film unique identification number, and a permeability part, and performs point detection, line detection, and edge detection. It is a functional unit that facilitates image reading by using a computer program that applies an edge detection, a combined detection method, an edge linking, and a boundary detection method. The image reading unit 4 uses the pattern & pattern classes classification method and the neural networks technique based on the acceptance criteria inputted from the image splitter 3 to the film data input unit 8. The result of the comparison and analysis is determined by the calculation operation by the applied computer program, and the processed result is transmitted to the result output unit 5. The result output section 5 has a device for outputting the result value processed by the image reading section 4 to a monitor 5-1 and a printer 5-2. The data management unit 6 stores and retrieves the acquired image and the results processed by the image reading unit 4.

Conventionally, there is a problem such as delay of inspection period, lack of objectivity and quality deterioration due to misreading due to reading by the human eye such as inspector using film reader. By analyzing and reading the film quantitatively, it is possible to make a quick, accurate and objective judgment, and a lot of space is needed for the storage by the conventional regulation on the storage of film materials. However, the present invention is a semi-permanent storage by storing the film data digitally. It is possible to remarkably improve the quality and related work processes throughout the industry, such as the possibility of retrieving film materials when necessary and easy to use. Can be.

Claims (1)

In the radiographic nondestructive examination, the image on the radiographic film 7 developed is acquired by the image acquisition unit 1, and the contrast stretching method and the gray level slicing method in the image preprocessing unit 2. Image enhancement using computer program with -level slicing method, histogram equalization method, and noise detection method, edge detection and boundary detection method In the image segmentation unit 3 and the image reading unit 4, which divide a specific part by using a computer program to facilitate image reading, the data transmitted from the image partitioning unit 3 is classified into pattern and pattern classes. And image analysis by computational operation using neural networks and neural networks, and outputs the result to the result output section 5 and manages the data. Apparatus configured for storing, reproducing and retrieving in section 6.