Rapid DVS image sensor column signal reading method

Abstract

The invention relates to a quick reading method of a DVS (Digital Video Standard) image sensor column signal. The method comprises the following steps of generating an event stream once after a pixelarray is triggered, and sending a row request signal into a row arbiter for arbitration processing; when the row arbiter selects one row, the site selection reading module quickly judging the pixel position of an event generated in the row, and then the event information in the row being sequentially transmitted to the outside of the chip through the column bus; if the transmission of all triggerissues is completed at the moment, ending the event stream transmission at the moment; otherwise, continuing to circulate the process till all trigger issues complete column event transmission. According to the method, column signal arbitration does not need to be carried out by using a column arbiter, and column signal transmission is carried out by using a site selection reading method. arbitration delay of column signals can be eliminated, and the working speed of the DVS image sensor under the condition of high event rate is improved.

Description

technical field [0001] The invention belongs to the field of analog integrated circuit design, in particular to a fast readout method for column signals of a DVS (dynamic vision sensor) image sensor. Background technique [0002] In recent years, with the gradual increase in people's demand for machine vision fields such as automatic driving and real-time tracking of objects, high-speed, high-precision, and low-power image sensors have become a research hotspot. However, the "frame" frequency working method of traditional image sensors has inherent shortcomings such as low time accuracy, redundant information, and high power consumption. When traditional image sensors capture high-speed scene information, the extremely high frame rate will lead to huge power consumption and a large amount of redundant data. Then, inspired by the information transmission method of biological retinal neurons, a new AER (Address event representation) communication method was proposed. After t...

AI Technical Summary

Problems solved by technology

However, DVS image sensors also have some shortcomings. Traditional DVS image sensors require row and column arbitrators to work at the same time to ensure the orderly transmission of event information.

This causes the sensor operating speed to be limited by the arbiter operating delay

Especially under high event rate conditions, a large increase in the arbitration delay results in a slowdown in sensor operation (where the column arbitration delay is much greater than the row arbitration delay)

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