Imagine is a stream-based prototype processor designed for media processing. It uses a three-level bandwidth hierarchy to exploit parallelism and data locality. It has good performance in media processing. H.264 is the newest digital video coding standard. It can achieve high coding efficiency at the cost of complex computation. In addition, video pictures have natural stream features, such as good special locality and limited temporal dependency. This paper presents an accelerated implementation of motion estimation, which is the most time-consuming part in H.264 coding framework, on Imagine stream processor. Experimental results show that the coding efficiency for QCIF format can be up to 372fps and surpass real-time requirement. The acceleration of stream processing is significant. It proves that H.264 coding is suited for implementation on Imagine.
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