简化的后处理快速景深效果  

SIMPLIFIED ALGORITHM FOR POST-PROCESSING FAST DEPTH OF FIELD EFFECT

作　　者：余伟[1] 张扬[2] 

机构地区：[1]西华大学数学与计算机学院,四川成都610039 [2]西南交通大学信息科学与技术学院,四川成都610031

出　　处：《计算机应用与软件》2009年第10期215-217,230,共4页Computer Applications and Software

摘　　要：基于几何光学中透镜成像模型,在保持景深真实特点的同时,采用后处理实现景深效果,提出一种易于在图形处理器上实现的简化算法,以进一步提高景深效果计算速度。相对于已有的后处理景深在图形处理器上的实现,该方法使用帧缓存对象(FBO)通过一遍模型绘制和一遍后处理实现景深效果。该算法可以在不改动固定图形管线渲染代码的情况下对给定场景实现快速的景深效果。实验表明,在通用的硬件条件下该后处理耗时0.3毫秒左右。Based on imaging model of geometric optics, a simplified algorithm which fits for the implementation on graphics processor units was proposed in this paper to further improve computation speed for large depth of field effect by adopting post-processing method to realise the effect of DOF while keeping the reality characteristic of the DOF. Compared with current implementation of post-processing DOF effect on graphics processor units, only one-off model rendering and one-off post-processing are needed in this algorithm with FBO （ Frame Buffer Object） to realise DOF effect. It can be used to implement fast DOF effect on a given model rendering without changing any original code of fixed graphics pipeline. Experiment demonstrated that our post-processing costs about 0. 3 ms under general hardware conditions.

关 键 词：景深 后处理 实时绘制 虚拟现实 图形处理器 

分 类 号：TP334.7[自动化与计算机技术—计算机系统结构] TB82[自动化与计算机技术—计算机科学与技术]