Volume rendering method of automatic identification overlapping structure based on two-dimensional transfer function

Abstract

The invention discloses a volume rendering method of an automatic identification overlapping structure based on a two-dimensional transfer function. The volume rendering method includes the following steps that firstly, volume data are read in, each voxel is calculated according to two attribute values needed by two-dimensional transfer function space, and the space of the transfer function is constructed; secondly, in order to obtain integrated interesting structures and solve the over-segmentation problem of a watershed algorithm, a transfer function classifier assembly is arranged in the constructed transfer function space and the number of the interesting structures is determined firstly, and then the grey value of the original volume data is automatically corrected; thirdly, for the corrected volume data, a classification result is obtained based on the grey value with the watershed algorithm, and therefore the interesting structures overlapped in the two-dimensional transfer function space can be identified at the same time. The volume rendering method is simple in principle, convenient to understand and capable of being easily achieved in the existing twp-dimensional transfer function space and a visualization system.

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, a volume rendering method for automatically identifying overlapping structures based on two-dimensional transfer functions. Background technique [0002] With the application of new image acquisition technologies (such as CT, MRI and PET, etc.) in clinical medicine, a large amount of medical volume data is generated. In order to better assist doctors in processing and analyzing these three-dimensional data, new data are needed Analysis and visualization methods. Direct volume rendering (Direct Volume Rendering) is a 3D visualization method that can show the internal structure of tissues. Because each pixel value of the final rendering result is generated by the accumulation of the optical property values ​​(color value and opacity value) of all voxels on a ...

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Problems solved by technology

[0005] Although the two-dimensional transfer function space has an intuitive interface and better recognition ability, the brightness value of each pixel in the two-dimensional space is determined by the number of voxels containing the attribute pair in the volume data, so when different When the structure of the transfer function space has a similar area, it cannot be identified directly by setting the transfer function

E.g Figure 5 A simulated data in (a) containing 2 spatially connected spherical structures O 1 and O 2 , if they are to be separated by a two-dimensional transfer function, they must correspond to two 'arch' structures in space, but since these two structures have the same attribute information, they are projected to the same position in the transfer function space ( Figure 5 (b)), so it cannot be separated by setting the transfer function

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