Research On 3D Model Retrieval Algorithm Based On Sketch

With the widespread use of 3D models in people's lives,the demand for 3D models has grown exponentially.It takes a lot of time to design a new three-dimensional model for a 3D model designer,so retrieving a similar three-dimensional model from the image library to modify and recombine it into the current three-dimensional model design trend.In order to meet the needs of the current 3D model,a 3D model retrieval algorithm based on the sketch is proposed by means of the simple and flexible features of the sketch.The basic idea of the algorithm is to transform the 3D model into 2D image,and use the sketch retrieval algorithm and the model sorting algorithm to realize the retrieval of the 3D model.In order to convert the three-dimensional model into two-dimensional image,three-dimensional model expression based on projection map is proposed.In order to match the sketch and the projection,a sketch retrieval algorithm based on the trusted feature distance is used.In order to sort the search results,a model-based sorting algorithm based on projection graphs is proposed,which includes statistic-based model sorting algorithm and position weight-based model sorting algorithm,and analyzes and compares the two algorithms.The 3D model retrieval algorithm based on the sketch adopts the typical CAD model as the experimental data,and completes the experiments of selecting the number of projection images in the three-dimensional model representation based on the projection map.Retrieval algorithm in the image size,block matrix size,distance transformation threshold selection experiment.A large number of experiments are carried out to obtain the projection model of the three-dimensional model based on the projection map,and eight projection views are selected for each model.The size of the sketch retrieval algorithm based on the trusted feature distance is 840 * 420,the size of the selected 7 * 7,distance transformation threshold selection 2.3,the algorithm at this time the best.Based on the Windows 10 Professional / MyEclipse 10 development environment and SolidWorks as the geometric platform,the 3D model retrieval algorithm based on the sketch is implemented,and the 3D model retrieval prototype system is developed on the basis of the algorithm.