Programmable artificial retinas (PAR) are image sensors with a
digital processor in each pixel. PAR based vision systems are our
framework. In its basic version, a PAR operates in SIMD mode,
which restricts it to low level vision only. To support higher
levels of vision, non-SIMD operators have to be settled in each
pixel. Programmable connections and asynchronous communications
are key ingredients to support regional computations, but under
which form? To identify the good ones, we consider adding pixel
data simultaneously over different regions as an exemplary
primitive. After recalling previous implementations, we propose a
novel one based on a tree extension of micro-pipelines that we
call convergent micro-pipelines.
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