A two-dimensional transfer function based volume data recognition method based on interactive operation

Abstract

The invention discloses a volume data identification method of a two-dimensional transfer function based on interactive operation. The method is characterized by, to begin with, a user setting transfer functions twice in a transfer function space for structures of interest, and correcting original volume data by searching voxels belonging to the transfer functions set by the user; and then classifying the voxels based on corresponding gray values and by utilizing a watershed algorithm, and thus the structures of interest overlapped in the transfer function space are identified. The problem of over-segmentation of the structures of interest is solved by utilizing the second transfer function set by the user to correct the gray values of the volume data. Every structure of the structures of interest overlapped in the transfer function space can be simultaneously identified by utilizing transfer functions set based on interaction and combining the watershed algorithm no matter whether the structures are connected spatially and under the premise that the space dimensionality of the transfer function is not increased, and shielding of un-interested structures can be eliminated and the shielding of the structures of interest can also be eliminated.

Description

technical field [0001] The invention belongs to the field of three-dimensional visualization in computer graphics, and in particular relates to a new method for identifying structures of interest in volume data, that is, using interactive operations combined with the watershed method to identify the sense of overlapping two-dimensional transfer function space method of interest structure. Background technique [0002] With the gradual application of new image acquisition technologies (such as CT, MRI, PET, etc.) in medicine, while enhancing the ability of doctors to analyze diseases, a large amount of medical-related three-dimensional volume data that needs to be analyzed is also generated. . Since the final rendering result of Direct Volume Rendering is generated by the accumulation of the optical attribute values ​​(color value and opacity value) of all voxels in the entire volume data, that is, the voxel pair rendering results of the entire volume data are all is a cont...

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Problems solved by technology

[0006] In order to solve the problem that different structures of interest overlap in the existing two-dimensional transfer function space (this overlapping structure cannot be identified by setting the transfer function), the present invention proposes a two-dimensional transfer function based on interactive operation The volume data recognition method, according to the local characteristics of the gray value of the structure in the volume data, uses the watershed algorithm based on the gray value to separate the structure overlapping the transfer function space, and because it is very sensitive to the gray value of the voxel, thus It leads to over-segmentation of the structure of interest, so the present invention corrects the gray value of the original volume data according to the twice transfer function set by the user to solve this problem

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