High speed on-chip multiple cosine transform generator

Speeding up video encoding process is an important issue nowadays due to the high demand of increasing the video transmission speed for real-time video applications. Many algorithms and hardware implementations have been proposed for achieving such demand using pixel domain motion estimation. Moreover, much savings in computations and hardware complexity can be achieved using frequency domain motion estimation (FDME). The key issues in the FDME encoder is to generate four different transforms that are used for deciding the best match motion vector in the motion estimation (ME) process. The related transformed-discrete cosine transform (RT-DCT) generator is responsible for generating such transforms in the FDME encoder. In this paper, a fast RT-DCT generator is proposed to speed up the FDME encoding time by reducing its complexity. That makes the proposed RT-DCT appropriated for real-time video applications with limited resources, such as mobile internet device, cellular phones, personal digital assistant (PDA), and ultra-mobile personal computer. Moreover, the proposed architecture does not scarify the resolution. By adding the proposed RT-DCT generator to the whole FDME system, implementation and simulation results show that the system performs ME for SDTV video sequence at 371 MHz.