JPH0643114A - Device for inspecting clogging of honeycomb - Google Patents

Abstract

(57) [Abstract] [Purpose] It is possible to speed up the inspection without the need to distinguish the boundary between the portion requiring inspection and the portion not requiring the clogging of the pores of the honeycomb. [Configuration] A television camera 4 that captures an image of a light beam that has passed through a honeycomb, and an original image 10 captured by the television camera 4,
Image processing to obtain an enlarged image 12 whose interior is filled by expansion processing, image processing to obtain a reduced image 13 obtained by reducing the enlarged image 12 smaller than the original image 10, and reduced image 13
And an original image 10 are AND-processed to delete the periphery of the original image 10 and obtain an extracted image 14 of only a necessary part of the original image.
Honeycomb clogging inspection device including a display device 6 for displaying the image of FIG.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for inspecting the presence or absence of a clogged portion of a honeycomb carrying a catalyst, which is used in, for example, an exhaust gas purifying apparatus for automobiles.

[Prior art]

[0002] A honeycomb in which a catalyst is dissolved is applied to a honeycomb in which a large number of pores formed of ceramics or metals are penetrated in parallel, the solution is dissolved in the pores, dried and fired to make a honeycomb carrying the catalyst. ing. When the catalyst is loaded on the honeycomb, if the catalyst solution is dried while remaining in the pores,
The pores in that portion are clogged and clogging occurs.
As a method for inspecting this clogging, a method is generally used in which light rays are allowed to pass through all the pores of the honeycomb to determine the degree of transmission.

When the honeycomb is used by mounting it in the exhaust pipe, as shown in FIG. 7, it is fixed in the pipe 7 by a fixing part 8, but the honeycomb 2 is fixed so as not to move in the pipe 7. The periphery of both ends is fixed so as to be held by the edge 9 of the fixed component 8. Light rays pass through the pores of the honeycomb 2,
When inspecting the clogging part, the fixed part 8 of the honeycomb 2
No gas is required to pass through the portion held by the edge 9 of the sheet, so that no inspection is required.

However, in the conventional inspection, since the light rays are passed through all the pores of the honeycomb for inspection, the boundary between the portion not requiring inspection and the portion requiring inspection is not clear, so that it is effectively used. It was difficult to judge whether or not there was clogging in the pores.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a honeycomb clogging inspection apparatus capable of obtaining an image of only a portion requiring inspection among all the pores of the honeycomb.

[0006]

According to the present invention, a television camera for taking an image of a light beam that has passed through a honeycomb and an original image photographed by the television camera are subjected to expansion processing to obtain a magnified image with a filled outline. Image processing and image processing to obtain a reduced image obtained by reducing the enlarged image to a size smaller than the original image, and AND processing of the reduced image and the original image to delete the periphery of the original image and extract only necessary parts of the original image. The above problem can be solved by a honeycomb clogging inspection device equipped with a computer that sequentially performs image processing for obtaining the image and a display device that displays the image of the computer.

[0007]

In the present invention, only the portion requiring inspection can be extracted by image processing by a computer and displayed on a CRT display, a liquid crystal display, or printed on paper by a printer for viewing. It is no longer necessary to distinguish the boundary between the part that does not need and the part that does not need, and the inspection can be speeded up.

[0008]

FIG. 1 shows an embodiment of the inspection device of the present invention, in which a light beam 1 is irradiated so as to pass through pores of a honeycomb 2, and the passing light beam 1 is projected on a semitransparent projection plate 3. Let
The image of the pores projected on the projection plate 3 is taken by the TV camera 4. The image of the light beam 1 that has passed through the pores of the honeycomb 2 may be directly captured by the television camera 4. The image captured by the television camera 4 is sent to the computer 5 for image processing, where it is image processed as follows.

The original image 10 sent from the television camera 4 to the computer 5 shows the entire cross section of the honeycomb 2, as shown in FIG. When the original image 10 is expanded, as shown in FIG. 3, an intermediate image 11 having an enlarged contour and a thick line is formed. When the enlargement is continued, an enlarged image 12 whose outline is completely filled is formed as shown in FIG. For the sake of explanation, the intermediate image 11 is shown,
In the actual process, the enlarged image 12 is obtained at once from the original image 10.

In the contraction processing of the enlarged image 12, if the sum of the enlarged portion of the original image 10 and the portion corresponding to the edge 9 of the fixed part 8 is contracted, it becomes a portion that needs inspection. Is contracted so that only the portion requiring inspection is obtained, and the reduced image 13 shown in FIG. 5 is obtained.

Next, the reduced image 13 and the original image 10 are
When the ND product processing is performed, the extracted image 14 of only the necessary portion of the original image shown in FIG. 6 in which only the inspection target range is extracted from the original image 10 excluding the peripheral portion is obtained. This is an image of the part where the gas passes. The extracted image 14 is displayed on the computer 5
Therefore, it is displayed on a display device 6 such as a CRT display, a liquid crystal display, a printer, or printed on paper so that it can be seen.

Although the cross-section having pores has an elliptical shape in the drawing, it can be applied to any cross-sectional shape such as a circle, a racetrack shape, and a square.

[0013]

According to the apparatus of the present invention, when inspecting the clogging of the pores of the honeycomb, it is not necessary to distinguish the boundary between the portion requiring the inspection and the portion not requiring the inspection, and the inspection can be performed quickly. .

[Brief description of drawings]

FIG. 1 is a schematic view of a device of the present invention.

FIG. 2 is an original image of a pore surface of a honeycomb as it is taken by a TV camera.

FIG. 3 is an intermediate image obtained by slightly expanding the original image of FIG.

FIG. 4 is an enlarged image of a state in which the intermediate image of FIG. 3 is subjected to expansion processing to a state in which the contour is completely filled.

FIG. 5 is a reduced image in a reduced state to obtain an image of a portion requiring the enlarged image of FIG.

6 is an extracted image obtained by AND-processing the original image of FIG. 2 and the reduced image of FIG.

FIG. 7 is a cross-sectional view showing a state where the honeycomb is fixed inside the exhaust pipe.

[Explanation of Codes] 1 Ray 2 Honeycomb 3 Projection Plate 4 Television Camera 5 Computer 6 Display Device 7 Tube 8 Fixed Parts 9 Edge 10 Original Image 11 Intermediate Image 12 Expanded Image 13 Reduced Image 14 Extracted Image

Claims (1)

[Claims] 1. A television camera that captures an image of a light beam that has passed through a honeycomb, image processing that expands an original image captured by the television camera to obtain an enlarged image in which the contour is filled, and the enlarged image. Image processing for obtaining a reduced image reduced to a size smaller than the original image and image processing for ANDing the reduced image and the original image to delete the periphery of the original image and obtaining an extracted image of only a necessary portion of the original image are sequentially performed. Computer to do,
A honeycomb clogging inspection device equipped with a display device for displaying a computer image.