Realization of Digital Image Rotation Based on FPGA
Yu Liu, Jian‐Jun He, Zhenfu Feng · 2025
Digital image rotation, as a common image geometry transformation technology, is widely used in electronic racemization system, LCD TV, digital photo frame, medical display system, projection display system and so on. This paper presents a digital image rotation circuit based on FPGA, which combines CORDIC algorithm and bilinear interpolation technology to realize image rotation processing. On the level of CORDIC algorithm, the pipeline architecture is used to realize the operation of sine and cosine functions. The interpolation module adopts the optimized bilinear weighted calculation scheme, which reduces the consumption of hardware resources and ensures the image quality. Experiments show that the image processed by this system is clear and stable, and can realize the free and smooth dynamic rotation of the image.