Processing area extraction method based on grayscale images
A grayscale image and processing area technology, which is applied in the field of processing area extraction based on grayscale images, can solve the problems of difficulty in extracting free-form surface processing areas and insufficient extraction accuracy of binary images, and achieve increased processing accuracy, increased precision, and improved The effect of extraction precision
Inactive Publication Date: 2018-02-09
YANSHAN UNIV
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Problems solved by technology
[0011] This method mainly solves the difficulty in extracting the free-form surface processing area, and the problem of insufficient extraction accuracy after the expansion of the binary image
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[0034] The present invention will be further described below in conjunction with the accompanying drawings.
[0035] A processing region extraction method based on a grayscale image of the present invention, its flow chart is as follows figure 1 As shown, the method includes the following steps:
[0036] Step 1: Discretize the original model of the free-form surface to obtain the Z-map model, such as figure 2 shown;
[0037] Described Z-map model is a matrix, and this matrix element is the Z coordinate corresponding to Z-map node; Described Z-map node is the node in Z-map model grid;
[0038] Step 2: Make any plane perpendicular to the Z axis as the section of the Z-map model; by judging the positional relationship between the matrix elements corresponding to the nodes and the Z coordinates of the section, the Z-map model of the current layer can be converted into a two-dimensional value image; such as figure 2 As shown, the cross-section is used to intersect the Z-map ...
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The invention discloses a processing area extraction method based on grayscale images. The method comprises the following steps of discretizing an original model of a free-form surface into a Z-map model, by means of a grayscale image expansion technology, obtaining a Z-map binary image and obtaining a Z-map grayscale image with a boundary pixel image, extracting the grayscale pixel with the boundary to obtain a Z-map grayscale boundary pixel image, subdividing the Z-map grayscale boundary pixel image to obtain Z-map grayscale boundary subdivided images; and coding the subdivided images to obtain the images of the corresponding processing area boundaries. According to the method, the problem that a free-form surface processing area is difficult to extract is solved, and the problem that the extracted precision after the expansion of the binary images is insufficient is solved; and the extraction precision of the processing area boundary in the machining process of the free-form surfaceis improved.
Description
technical field [0001] The invention relates to a method for extracting a processing area of layered milling and 3D printing, in particular to a method for extracting a processing area based on a grayscale image. Background technique [0002] With the continuous development of computer graphics, CAD / CAM and other technologies, layered milling and 3D printing, as the most important free-form surface processing methods, are increasingly used in the fields of biomedical restoration preparation, aerospace, shipbuilding, and automobiles. widely. The boundary of the processing area is the basis of the layered milling and 3D printing scanning path, so it is of great theoretical and practical significance to study the extraction technology of the processing area of the free-form surface. [0003] The processing area is the processing range of each layer during layered processing, which is usually determined by the processing inner boundary and outer boundary. The inner boundar...
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Login to View More IPC IPC(8): G06T7/13G06T7/187
CPCG06T7/13G06T7/187G06T2207/30164
Inventor 郭保苏范琰琰梁卓陈建超吴凤和李永欣
Owner YANSHAN UNIV