Visualization method and system for focus area based on OpenGL

Abstract

The invention provides an OpenGL-based focus area visualization method and system. The method comprises the steps of S1 receiving the model data of a focus area, and constructing an n-element space subdivision tree; S2 traversing the n-element space subdivision tree, and marking tree nodes and leaf nodes in a view cone as potential visibility; S3 judging the shielded tree nodes, and marking the shielded tree nodes as invisible; and S4 calculating adaptive occlusion coefficients of the tree nodes, marking the tree nodes of which the adaptive occlusion coefficients are smaller than a preset threshold value as invisible, and rendering and displaying the remaining tree nodes. According to the invention, aiming at a large-scale complex model in an orthopaedic minimally invasive surgery, the model rendering efficiency is optimized through methods such as occlusion elimination and the like; hardware support such as texture mapping or special occlusion search is not needed; rendering of a focus area model can be completed in real time in the surgery; and conditions around a focus of a patient can be displayed in real time.

Description

technical field [0001] The invention belongs to the fields of digital medicine, precision medicine, and computer graphics, and in particular relates to an OpenGL-based visualization method and system for a lesion area. Background technique [0002] "Minimally invasive" is an inevitable trend in the development of orthopedic surgery, how to make minimally invasive surgery "precision" is an urgent problem to be solved. With the continuous development of virtual reality technology, its application to the medical field, especially the minimally invasive field of orthopedics, has attracted more and more attention. The use of virtual reality technology can break through the constraints of space, and show the patient's lesion area to the surgeon in an all-round way without dead ends, fundamentally solving the problems of non-intuitive and inaccurate positioning in orthopedic minimally invasive surgery. [0003] In minimally invasive orthopedic surgery, the model of the lesion area...

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Problems solved by technology

[0016] Existing polygonal model subdivision and representation methods, such as: BSP tree, k-D tree, octree, etc., will cause many problems when representing the patient's lesion area: when the polygon in the patient's lesion area model is located in the subdivision plane When on the boundary, the polygon needs to be split into multiple small triangles to produce disjoint bounding volume objects, which will cause numerical problems and increase the rendering load, and the real-time display delay is large

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