不同类型高度图控制浅浮雕模型生成方法  

Bas-relief generation controlled by different height maps

作　　者：尚菁 余文杰 王美丽[1,2,3] Shang Jing;Yu Wenjie;Wang Meili(College of Information Engineering,Northwest A&F University,Yangling 712100,China;Key Laboratory of Agricultural Internet of Things,Ministry of Agriculture and Rural Affairs,Yangling 712100,China;Shaanxi Key Laboratory of Agricultural Information Perception and Intelligent Service,Yangling 712100,China)

机构地区：[1]西北农林科技大学信息工程学院,杨凌712100 [2]农业农村部农业物联网重点实验室,杨凌712100 [3]陕西省农业信息与智能服务重点实验室,杨凌712100

出　　处：《中国图象图形学报》2020年第12期2647-2655,共9页Journal of Image and Graphics

基　　金：国家自然科学基金项目(61402374);农村农业部农业物联网重点实验室项目(2018AIOT-09);陕西省重点研发计划农业农村领域一般项目(2019NY-167)。

摘　　要：目的数字浅浮雕是在平面载体上塑造高低起伏形象的一种造型艺术,具有独特的结构及视觉效果,应用场景极为广泛。为了增加数字浮雕设计的多样性,实现浮雕的风格化应用,提出一种基于高度图的浅浮雕模型生成方法。方法引入掩模理论,利用掩模操作对待处理的图像进行处理,融合图像处理技术,控制所要生成浮雕不同部位的高度,得到控制浮雕生成效果的高度图,借鉴已有的浅浮雕模型生成方法,利用基于高斯混合模型的滚动引导法向滤波(Gaussian mixture model based rolling guidance normal filtering,GRNF)进行法向分解,基于Sf G(surface from gradients)的局部调整和全局重建的方法进行曲面重建,采用拉普拉斯算子及双边滤波器进行去噪平滑处理,最终生成不同高度风格的浅浮雕模型。结果实验结果表明,本文方法能够生成带有不同视觉效果的浅浮雕模型,通过对细节特征及结构特征相关参数的调整,均能够生成轮廓清晰、细节丰富的浅浮雕模型。结论本文提出的基于高度图的浅浮雕模型生成方法能够为浅浮雕的多样化设计提供新的思路和方法,在家居装饰行业中有重要的应用价值。Objective Digital bas-relief is a special model that is either raised or lowered and is usually attached to a planar background.The spatial structure of a digital bas-relief lies between a 3D shape and a flat shape.Despite taking up limited space,a bas-relief contains a rich amount of details.Given its unique spatial structure and visual effects,a bas-relief can be applied across various fields.Various bas-relief models have been applied in designing ceramic vessels,wooden carvings,and coin badges,among others.Given its effective space utilization and excellent visual presentation,the bas-relief has been increasingly applied in decoration.However,with the continuous development of digital technology and 3D printing,the demand for and the requirements of bas-relief generation have become increasingly diverse.To enhance the diversity of digital bas-relief design and realize its stylized application,generating a bas-relief model based on height maps has been examined in the literature.Designing and adjusting the height map of relief works can help obtain highly efficient and intuitive embossed decorated models.Method By introducing masks and integrating image processing technology,a height map is generated to control the relief effect,and the existing bas-relief model generation method is adopted to generate basrelief models with different styles.Masks have an important application value in the field of image processing.A mask is used to control the height of the local area and different areas of the relief to obtain different height information.Through this mask,a normal map with different height information can be obtained and used as input for the bas-relief model generation algorithm.This algorithm normalizes the vectors of different height information.Normal information processing offers two key advantages.On the one hand,transforming normal information can directly reflect surface variation characteristics,which play important roles in the later stages of geometric reconstruction.On the other hand,the depth va

关 键 词：浅浮雕 法向分解 几何重建 高度图 掩模理论 

分 类 号：TP301.6[自动化与计算机技术—计算机系统结构]