The color filter array (CFA ) format image needs to interpolation to obtain the full color image. However

the interpolation algorithm of the CFA image is more complex

the image quality is higher

but the complexity algorithm will take more time to implementation

and it is inconvenient for real-time processing. This paper introduces two interpolation algorithm: the bilinear interpolation and edge oriented interpolation

and uses the FPGA hardware platform to realize the bilinear interpolation algorithm and the edge orientation algorithm

and analyzes two kind of algorithm with black and white stripes image. Conside-ring the edge direction

the edge oriented interpolation algorithm prevents the border interpolation

so the interpolation effect is better than that of the bilinear interpolation algorithm. Although the algorithm is some more complex

the optimized design of FPGA cache module

using parallel and pipiline processing mode

will fully meet the real-time requirements of engineering.