Minimum gradient included angle pre-integration illumination method of self-adaptive sampling
An adaptive sampling and pre-integration technology, applied in 3D image processing, image data processing, instruments, etc., can solve the problems of small sampling step size, failure to achieve interactive performance, etc., and achieve the effect of enhancing the lighting effect
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[0078] The present invention will be further described below in conjunction with accompanying drawing:
[0079] refer to Figure 1 to Figure 5 , an adaptive sampling minimum gradient angle pre-integration lighting method, the adaptive sampling pre-integration lighting algorithm includes the following steps:
[0080] 1) Import medical body data;
[0081] 2) First, establish multiple pre-integration tables with different step lengths. The number of tables can be determined according to the accuracy requirements of the actual application. During the sampling process, adaptive sampling is performed according to the change trend of the scalar field. When the scalar value changes drastically In the area where extreme values (minimum and maximum values) are encountered, a smaller sampling step can be used; while in areas where the scalar value changes relatively gently, the sampling step can be increased accordingly.
[0082] 3) Reconstruct the gradient in the pre-integration seg...
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