2D CAD Drawings Research Articles

A Blind Watermarking Algorithm for 2D CAD Drawings Based on SVD

A blind watermarking algorithm for 2D CAD drawings based on singular value decomposition (SVD) is presented. In this paper, the handles of lines are sorted to rule out additional entities and relative vertex coordinates are divided into small matrixes for larger watermark capacity. Then, quantization modulation is used to embed watermark so it can be extracted without original drawings. The experiments show that the proposed algorithm has good invisibility, larger watermark capacity and is also robustness to various geometric and entity addition attacks.

The Study of Automatic Programming System for Near-Field Electrospinning Direct Write

In order to control the machining process of Direct-Write based on Near-field Electrospinning automatically, an automatic programming system used for an open architecture CNC system is proposed in this paper. This system descirbes the machining trajectory via the 2D CAD drawing, from which the data is extracted by the system. According to the processing parameters, the data is classified and reordered, and NC codes are automatically generated. The system solves the problem in integrating the design and machining, makes it more convenient to experimental research and realizes patterned fabrication of micro/nano-structure,which provides a good experimental base for the development of electrospinning technology.