CN101399998A - 白平衡调整系统及方法 - Google Patents
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- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
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Abstract
本发明提供一种用于数码摄像装置的白平衡调整系统,该系统包括:一个全球定位系统模块,用于获取卫星发出的载有位置信息和时间信息的信号,并输出所述位置信息、所述时间信息及当前位置的信号强度;一个处理器,该处理器内部预设有一个信号强度阈值,所述处理器接收所述全球定位系统模块输出的信号强度并将该信号强度与所述信号强度阈值进行比较,根据比较结果判断当前环境是室内还是室外,所述处理器还用于判断全球定位系统的可用状态;一个白平衡调整模块,用于根据处理器的判断结果,进行白平衡调整。本发明还提供一种白平衡调整方法。利用本发明可根据GPS信号强度协助数码摄像装置判断拍照所处环境是室内还是室外,进而弥补传统白平衡室内外误判的情形。
Description
技术领域
本发明涉及一种白平衡调整系统及方法。
背景技术
目前的自动白平衡调整中,是根据现场光源亮度和光源中红、绿、蓝成分的比重来进行白平衡模式的选择。这种方法存在一定误判的情况。比如,将室外傍晚或阴天等低色温场景误判为室内,从而对照片进行蓝色补偿,造成无法还原真实的室外场景,无法达到预想的效果。
发明内容
鉴于以上内容,有必要提供一种白平衡调整系统及方法,其可以判断出室内、室外环境,从而可以还原室外低色温场景的真实色彩。
一种用于数码摄像装置的白平衡调整系统,该系统包括:一个GPS(全球定位系统)模块,用于获取卫星发出的载有位置信息和时间信息的信号,并输出所述位置信息、所述时间信息及当前位置的信号强度;一个处理器,该处理器内部预设有一个信号强度阈值,所述处理器接收所述全球定位系统模块输出的信号强度并将该信号强度与所述信号强度阈值进行比较,根据比较结果判断当前环境是室内还是室外,所述处理器还用于判断全球定位系统的可用状态;一个白平衡调整模块,用于根据处理器的判断结果,进行白平衡调整。
一种用于数码摄像装置的白平衡调整方法,该方法包括如下步骤:首先判断GPS是否可用;当全球定位系统可用时,接收卫星发出的载有位置信息和时间信息的信号,并输出所述位置信息、所述时间信息及当前位置的信号强度;根据GPS的信号强度与预设的信号强度阈值比较,判断当前环境是室内还是室外;最后根据判断出的室内或室外结果,进行白平衡调整。
相较于现有技术,所述的白平衡调整系统及方法,其可以通过GPS信号的强度和其输出位置信息和时间信息来协助数码摄像装置判断拍照场景,可以弥补传统白平衡室内外误判的情形。
附图说明
图1是本发明实施例提供的一种白平衡调整系统的功能模块图。
图2是本发明实施例提供的一种白平衡调整方法的流程图。
具体实施方式
如图1所示,是本发明实施例提供的一种白平衡调整系统的功能模块图。该白平衡调整系统包括一个处理器11、一个GPS模块12、一个白平衡调整模块13及一个存储器14。
所述处理器11,该处理器11内部预设有一个信号强度阈值,一个第一纬度阈值、一个第二纬度阈值,在本实施例中,为了提高处理速度,采用两个纬度阈值,来划分三个纬度带,即高、中、低三个纬度带。如果需要,可以设置更多个纬度阈值,划分更细的纬度带。在本实施例中,第一纬度阈值是30度,第二纬度阈值是60度。高纬度是指大于60度的纬度,中纬度是指大于等于30度且小于等于60度的纬度,低纬度是指小于30度的纬度。
所述存储器14用于保存一个内建表。该内建表列出高、中、低纬度每段时间对应的白平衡补偿值。
所述处理器11判断GPS模块12是否在可用状态,即是否可以接收到卫星发出的数据。当GPS模块12可以接收到卫星发出的数据时,则GPS模块12处在可用状态,如果GPS模块12不能接收到卫星发出的数据时,则GPS模块12不可用,此时,白平衡调整模块13采用传统白平衡调整,即根据现场光源亮度和光源中红、绿、蓝成分的比重来进行白平衡模式的选择。
当GPS模块12处在可用状态时,处理器11根据从GPS模块12中接收的信号强度与处理器11本身预设的信号强度阈值进行比较,判断当前是在室内还是室外,当信号强度大于所述强度阈值时,则判断当前环境为室外;当信号强度小于等于所述强度阈值时,则判断当前环境为室内。例如,一般在室内的信号强度是小于等于-145dbm(毫瓦分贝),如果在此范围内,就判断当前环境为室内,而在室外一般是大于-145dbm,在此范围内,则判断当前环境为室外。
当所述处理器11判断出当前处于室外环境时,处理器11根据从GPS模块12中接收的卫星的个数与处理器11本身预设的卫星数目进行比较,判断是否可以成功定位。例如,如果卫星数目不小于四颗,则认为可以成功定位。因为在室外不同纬度,承受可见光的辐射强度不同,而且室外不同时间段,日光强度不同,所以在室外定位成功后,还需要了解室外当时的日照强度。
GPS模块12可以输出当前的经纬度及格林威治时间,所以可以利用GPS模块12判断当前位置的经纬度,处理器11根据当前位置的经度,计算出当前位置与格林威治时间的时差,得到当地时间。处理器11根据当前纬度的高低和当时的时间在存储器14中的内建表中查找与之相对应的室外白平衡调整补偿值,处理器11将白平衡补偿值输出到白平衡调整模块13,进行白平衡调整。例如,在室外白天的情况下,正午时段处于低纬度的非洲,因为室外亮度很高,可能输出抑制亮度的白平衡补偿值,但如果是同时段的处于高纬度的极圈附近,就可以输出提高亮度的白平衡补偿值。
当GPS模块12无法定位时。例如,当拍摄者在峡谷一线天,或是位于高楼林立处,由于有遮蔽,虽然信号很强,但只能接收到数量较少的卫星,不足以定位时,则采用第一室外白平衡模式进行调整,该第一室外白平衡模式调整是白平衡调整模块13内部预设的一种室外白平衡模式调整方式。
如图2所示,是本发明实施例提供的一种白平衡调整方法的流程图。首先,步骤S101,处理器11判断GPS模块12是否在可用状态;
步骤S201,当GPS模块12在不可用状态,利用白平衡调整模块13根据现场光源亮度和光源中红、绿、蓝成分的比重来进行白平衡模式的选择,即采用传统的白平衡调整;
步骤S102,当步骤S101判断出GPS模块12在可用状态时,将GPS模块12输出的信号强度与处理器11内预设的信号强度阈值进行比较,判断是否超过该阈值,本实施例中,所述阈值为145dbm;
步骤S103,当GPS模块12输出的信号强度超过处理器11内预设的信号强度的阈值时,则认为摄像装置所处环境为室外,根据从GPS模块12中接收的卫星数目是否超过处理器11预设的数目,判断是否可以成功定位,本实施例中,所述阈值为-145dbm,预设的数目为四颗;
步骤S104,当定位成功后,根据GPS模块12输出数据中的纬度与处理器11内预设的纬度阈值进行比较,判断当前所处纬度的高低,且处理器11根据GPS模块12输出数据中的经度及格林威治时间,计算出当地时间,读取存储器14中的内建表,确定当前纬度、当前时间的白平衡补偿值,根据白平衡补偿值进行第二室外白平衡调整,所述第二室外白平衡调整是白平衡调整模块13根据内建表中的白平衡补偿值,直接对摄取的图像进行白平衡调整。本实施例中,所述第一纬度阈值为30度,第二纬度阈值为60度;
步骤S301,当步骤S102中GPS模块12的信号强度小于等于强度的阈值时,则认为摄像装置所处环境为室内,白平衡调整模块13利用室内白平衡模式进行白平衡调整,本实施例中,所述阈值为-145dbm;
步骤S401,当步骤S103中判断无法定位时,白平衡调整模块13进行第一室外白平衡模式调整,该第一室外白平衡模式调整是白平衡调整模块13内部预设的一种室外白平衡模式调整方式。
利用本发明可根据GPS信号强度,其输出的位置参数和时间参数协助数码摄像装置判断拍照所处环境是室内还是室外,进而弥补传统白平衡室内外误判的情形。
另外,本领域技术人员还可在本发明精神内做其它变化,只要不偏离本发明的技术效果,都应包含在本发明所要求保护的范围之内。
Claims (10)
- 【权利要求1】一种白平衡调整系统,用于数码摄像装置的白平衡调整,其特征在于,该系统包括:一个全球定位系统模块,用于获取卫星发出的载有位置信息和时间信息的信号,并输出所述位置信息、所述时间信息及当前位置的信号强度;一个处理器,该处理器内部预设有一个信号强度阈值,所述处理器接收所述全球定位系统模块输出的信号强度并将该信号强度与所述信号强度阈值进行比较,根据比较结果判断当前环境是室内还是室外,所述处理器还用于判断全球定位系统的可用状态;一个白平衡调整模块,用于根据处理器的判断结果,进行白平衡调整。
- 【权利要求2】如权利要求1所述的白平衡调整系统,其特征在于,所述的白平衡调整系统,还包括一个存储器,该存储器存有不同纬度带每段时间对应的室外白平衡补偿值的一个内建表。
- 【权利要求3】如权利要求2所述的白平衡调整系统,其特征在于,所述全球定位系统模块获取的数据包括经纬度数据,格林威治时间数据,所述处理器还包含多个纬度带划分阈值,根据所述数据中的经纬度与各阈值比较,判断使用者所处纬度带。
- 【权利要求4】如权利要求3所述的白平衡调整系统,其特征在于,所述处理器还根据所述全球定位系统模块输出的经度与格林威治时间的时差,计算出使用者所处的当地时间,所述处理器根据当前所处纬度带和当时的时间在所述存储器中的内建表中查找与之相对应的室外白平衡补偿值,所述白平衡调整模块根据所述处理器输出的室外白平衡补偿值,进行白平衡调整。
- 【权利要求5】如权利要求1所述的白平衡调整系统,其特征在于,所述白平衡调整模块是采用内置预设的场景模式来完成白平衡调整。
- 【权利要求6】如权利要求5所述的白平衡调整系统,其特征在于,所述处理器判断出全球定位系统无法使用时,则利用所述白平衡调整模块内置预设的场景模式来完成白平衡调整。
- 【权利要求7】一种白平衡调整方法,用于数码摄像装置的白平衡调整,其特征在于,该方法包括如下步骤:判断全球定位系统是否可用;当全球定位系统可用时,接收卫星发出的载有位置信息和时间信息的信号,并输出所述位置信息、所述时间信息及当前位置的信号强度;根据全球定位系统输出的信号强度与预设的信号强度阈值比较,判断当前环境是室内还是室外;根据判断出的室内或室外结果,进行白平衡调整。
- 【权利要求8】如权利要求7所述的白平衡调整方法,其特征在于,其还包括步骤:当全球定位系统不可用,则根据现场光源亮度和光源中红、绿、蓝成分的比重来进行白平衡模式的选择。
- 【权利要求9】如权利要求7所述的白平衡调整方法,其特征在于,其还包括步骤:当判断出在室外时,判断全球定位系统是否可以定位,当无法定位时,采用第一室外白平衡调整。
- 【权利要求10】如权利要求9所述的白平衡调整方法,其特征在于,其还进一步包括:当全球定位系统可以定位时,根据所处位置信息及当地时间所需要的白平衡补偿值,进行第二室外白平衡调整。
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US8013908B2 (en) | 2011-09-06 |
US20090079846A1 (en) | 2009-03-26 |
CN101399998B (zh) | 2011-06-08 |
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