CPC H04N 25/75 (2023.01) [H04N 25/76 (2023.01)] | 13 Claims |
1. An event-driven sensor comprising:
a pixel array;
a column readout circuit coupled to column output lines of the pixel array, the column readout circuit comprising, for each of the column output lines, a column register cell coupled to the column output line, the column register cells being coupled in series with each other to propagate a first token, wherein each column register cell is configured to activate a column event output signal when it receives the first token while an event is indicated on the column output line; and
a row readout circuit coupled to row output lines of the pixel array, the row readout circuit comprising, for each of a plurality of sub-groups of the row output lines, a row register cell coupled to a plurality of the row output lines via a logic gate configured to combine row event signals on the plurality of the row output lines to generate a combined row event signal, the row register cells being coupled in series with each other to propagate a second token, wherein each row register cell is configured to activate a row event output signal when it receives the second token while an event is indicated by the combined row event signal of the sub-group.
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