CN117387777A - 用于红外视频光谱成像系统的自适应快门校正方法 - Google Patents
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Abstract
本发明公开了一种用于红外视频光谱成像系统的自适应快门校正定标方法,从成像系统的角度出发,将快门置于一次像面位置,对一次像面后的所有光学部件及探测器焦平面阵列进行全路径校正。相较于传统工业用红外成像系统将快门置于探测器焦平面前的标定方法,本发明更好地抑制了望远镜系统、准直镜系统以及探测器组件带来的综合性影响,较好地实现非均匀校正和辐射校正。对于红外视频光谱成像系统来说,环境温漂及系统发热等情况引起的快门温度变化会影响校正结果的准确性,为进一步提升系统的辐射定标精度,设计将系统置于气密设计的恒温腔内,根据环境温度自适应调节腔体内的温度,维持在相对稳定,通过这种方式可以获得更好的校正和标定效果。本发明作为一种普适性的方法,在红外视频光谱成像系统中有较好的应用前景。
Description
技术领域:
本发明涉及一种用于红外视频光谱成像系统的自适应快门校正定标方法,特指一种可以校正一次像面后所有光学系统非均匀性且不受环境温度影响的快门校正方法。
背景技术:
红外光谱成像技术是一种将红外辐射转化为可视化图像的技术,它包含有关物体的温度、组成和结构等信息。红外光谱成像技术的原理是基于物体辐射出的红外光谱特征。物体在不同波长的红外辐射下会产生不同的反射、吸收和透射,这些特征可以通过红外光谱成像设备捕捉并转化为图像。光谱成像仪是一种高级的红外光谱成像设备,它可以同时获取物体的红外辐射能量和光谱信息。光谱成像仪可以在不同波长范围内捕捉红外辐射,并通过光谱分析来确定物体的组成和结构。光谱成像仪广泛应用于材料科学、环境监测、生物医学等领域。
红外光谱成像系统核心元件为红外探测器,探测器焦平面阵列不同位置的像素对红外辐射的响应不一致,常常导致图像中出现亮度不均匀或者测量误差。快门校正是红外光谱成像中的一项关键技术,通过进行快门校正,以快门这一均匀辐射面为参照物计算每个像素的偏移量,每帧图像减去偏移量可以对探测器焦平面的非均匀性进行校正,使得不同位置的像素对红外辐射的响应更加一致。此外,探测器为热响应器件,因此红外光谱成像技术成像效果受环境温度漂移及仪器自身发热情况影响较大。环境温漂导致光学系统温度变化,仪器自身发热使光学元件和快门温度变化不均匀,这些都会导致最终采集图像质量不理想。
针对上述红外光谱成像系统的快门校正方法现状,本发明提出了一种用于红外视频光谱成像系统的自适应快门校正定标方法,将快门置于一次像面处,增加了后截距,为系统空间分辨率的提升提供了空间;同时对一次像面之后的所有光学元件及探测器焦平面阵列进行均一化处理,消除了这部分光学元件非均匀性影响。此外,针对受环境温漂和机芯自身发热情况的影响,设计了恒温腔,根据环境温度自适应调节腔体内的温度,使系统各光学元件的温度维持在恒定水平,从而获得更准确的定标结果。
发明内容:
本发明涉及一种用于红外视频光谱成像系统的自适应快门校正定标方法,将快门置于一次像面处,消除了一次像面后所有光学元件非均匀性影响,同时使标定过程在恒温下进行,抑制环境温漂和器件自身热效应的影响,是一种全新的技术手段。
本发明为一种用于红外视频光谱成像系统的自适应快门校正定标方法,系统包括两个工作模式:正常探测模式和校正标定模式。当处于正常探测模式时,快门1处于开启状态;当处于校正标定模式时,快门1处于遮挡状态,探测器获取校正参数。整个系统置于温控腔2内。
进一步的,所述快门1位于一次像面处,以旋转的运动轨迹切换工作模式。当系统处于正常探测模式,快门1打开,探测器采集场景图像;当系统处于校正标定模式,快门1关闭,遮挡一次像面,探测器采集快门图像,获取校正参数。
进一步的,所述恒温腔2对整个系统的温度进行控制,保持腔体内温度恒定,腔体设计气密,并充入氮气以避免水汽干扰。
本发明的优点在于:通过本方法设计的红外视频光谱成像系统具有较高的空间分辨率,具备较强的环境自适应能力,最终获得好的定标效果。相较于传统的快门置于探测器芯面前进行红外成像标定的方法,本方法可以获得更大的后截距和更好的校正效果,并较好地应用于光谱成像系统;将系统置于恒温腔内,使标定过程免受环境温度漂移和器件自身热效应的影响,获得更加准确的标定结果。本发明作为一种普适性的方法,在红外光谱成像系统中有较好的应用前景。
附图说明:
附图1为快门处于正常探测模式的状态。
附图2为快门处于校正标定模式的状态。
具体实施方式:
上述说明仅作为本发明技术方案概述,为了能够更清楚地了解本方案的技术手段,并按照说明书地叙述加以实施,根据本发明内容,下文给出适用于本方案的一个具体事例的详细说明。
本实例构建了一套用于红外视频光谱成像系统的自适应快门校正方法,该方法的使用包含两个工作模式,图1所示为正常探测模式。该模式下,快门处于打开状态,探测器采集目标场景数据;图2所示为校正标定模式,该模式下快门处于遮挡状态,探测器采集快门图像数据,获取校正参数。从正常探测模式切换至校正标定模式,快门采用旋转的方式切换模式。整个红外视频光谱成像系统置于恒温腔内,定标过程始终在恒温条件下进行,能够稳定地获取较好的图像质量。
Claims (2)
1.一种用于红外视频光谱成像系统的自适应快门校正定标方法,所述的用于红外视频光谱成像系统的环境自适应快门校正定标方法其特征在于:
所述快门校正方法将快门置于一次像面位置,相较于传统相机快门置于探测器芯面前,增加了光学系统的后截距,有利于增大系统光学口径,从而获得更高的空间分辨率。此外,快门置于探测器芯面前,快门校正对探测器焦平面阵列进行均一化处理;快门置于一次像面处,对一次像面之后的所有光学元件及探测器焦平面阵列进行均一化处理,消除了光学元件非均匀性影响。
2.根据权利要求1所述的一种用于红外视频光谱成像系统的自适应快门校正定标方法,其特征在于:
所述快门校正定标方法将红外视频光谱成像系统置于气密恒温腔内,气密设计为氮气,使红外光学镜片免受水汽影响。根据环境温度自适应调节腔体内的温度,维持在恒定水平,通过这种方式可以有效抑制环境温漂及系统发热对快门温度的影响,从而获得更准确的定标结果。
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