In view of some drawbacks in gray associative analysis method, this paper presents a linear interpolation method, which considerably improves the resolution.

The paper investigate a structure of the digital down-converter(DDC) and put forward a design of numerical controlled oscillator with method of tabulation view and fraction ratio decimation filter with mixing linear interpolation algorithm and CIC filter,so that the DDC process could be implemented in software on general purpose DSP chip and afford greater flexibility.

In the context, qualified visual three-dimensional ICT pictures are achieved through multi-piece two-dimensional images accumulation by, combining with thresholding method and linear interpolation.

FPGA is used as the video processor, and bilinear interpolation module is designed using Verilog HDL.

We also improve bilinear interpolation and the construction of Huffman table.

It discusses the spatial correlation of local area differential GPS,and introduces several common methods,such as weighted average method,linear interpolation method,low-order surface model,triangle interpolation algorithm,and analyses interpolation coefficients and interpolation quality fact.