Title:
BLACK LEVEL CANCELLATION METHOD AND SYSTEM, AND IMAGE SENSOR HAVING SYSTEM
Document Type and Number:
WIPO Patent Application WO/2017/067351
Kind Code:
A1
Abstract:
Disclosed is a black level cancellation method, comprising: receiving a first level signal and a second level signal that are outputted by an effective pixel unit; starting first counting when receiving the first level signal and a ramp signal, and stopping the first counting when the amplitude of the ramp signal is equal to that of the first level signal, to obtain a first count value; performing timing when receiving the second level signal and the ramp signal, starting second counting after delaying for the preset quantity of clock periods, and stopping the second counting when the amplitude of the ramp signal is equal to that of the second level signal, to obtain a second count value, wherein the preset quantity is a black level value of a non-luminous pixel unit; and obtaining a digital signal according to the first count value and the second count value. The method cancels a black level during conversion of a second level signal, and saves the time needed by subtracting a black level value from an analysis result of an effective pixel unit in a digital circuit.
Inventors:
PEI XUEYONG (CN)
GUO XIANQING (CN)
GUO XIANQING (CN)
Application Number:
PCT/CN2016/098893
Publication Date:
April 27, 2017
Filing Date:
September 13, 2016
Export Citation:
Assignee:
BYD CO LTD (CN)
International Classes:
H04N5/357
Foreign References:
| CN101448078A | 2009-06-03 | |||
| CN104335573A | 2015-02-04 | |||
| CN101969535A | 2011-02-09 | |||
| JP2012191378A | 2012-10-04 |
Attorney, Agent or Firm:
TSINGYIHUA INTELLECTUAL PROPERTY LLC (CN)
Download PDF:
Previous Patent: AUDIO DATA PLAYBACK METHOD, DEVICE, AND COMPUTER STORAGE MEDIUM
Next Patent: INFORMATION PROCESSING SYSTEM, METHOD AND DEVICE
Next Patent: INFORMATION PROCESSING SYSTEM, METHOD AND DEVICE