US 11,818,513 B2
Self-adaptive adjustment method and adjustment system for brightness of projection apparatus
Bo Zhong, Sichuan (CN); Shi Xiao, Sichuan (CN); Xin Wang, Sichuan (CN); and Jianjun He, Sichuan (CN)
Assigned to CHENGDU XGIMI TECHNOLOGY CO., LTD., Sichuan (CN)
Appl. No. 17/778,403
Filed by CHENGDU XGIMI TECHNOLOGY CO., LTD., Sichuan (CN)
PCT Filed Mar. 13, 2020, PCT No. PCT/CN2020/079159
§ 371(c)(1), (2) Date May 19, 2022,
PCT Pub. No. WO2021/103346, PCT Pub. Date Jun. 3, 2021.
Claims priority of application No. 201911164783.6 (CN), filed on Nov. 25, 2019.
Prior Publication US 2022/0408065 A1, Dec. 22, 2022
Int. Cl. H04N 9/31 (2006.01)
CPC H04N 9/3155 (2013.01) [H04N 9/3188 (2013.01); H04N 9/3191 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A self-adaptive adjustment method for brightness of a projection apparatus, comprising:
S11: collecting an ambient illuminance value and a projection distance value of the projection apparatus;
collecting the ambient illuminance value in S11 comprises:
S1111: projecting an nth frame of projected image, wherein n is a positive integer;
S1112: collecting the ambient illuminance value at least twice in a projection gap period;
S1113: determining whether n is larger than a preset number of projected frames, proceeding to S1114 under the condition that n is larger than the preset number of projected frames, and n=n+1 and returning to S1111 under the condition that n is not larger than the preset number of projected frames; and
S1114: computing a trimmed mean of all collected ambient illuminance values, so as to obtain a final ambient illuminance value;
S12: computing a projection plane illuminance value of the projection apparatus according to a relation function, an acquired ambient illuminance value and the projection distance value of the projection apparatus, wherein the relation function is a function between the projection plane illuminance value and the ambient illuminance value as well as the projection distance value; and
S13: adjusting brightness of the projection apparatus according to the projection plane illuminance value of the projection apparatus.