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    • 31. 发明公开
    • METHOD OF CONTROLLING A FUNCTION OF A DEVICE AND SYSTEM FOR DETECTING THE PRESENCE OF A LIVING BEING
    • 一种用于控制装置和系统的功能用于确定活体的存在
    • EP2404261A1
    • 2012-01-11
    • EP10708622.5
    • 2010-03-01
    • Koninklijke Philips Electronics N.V.
    • CENNINI, GiovanniJEANNE, Vincent
    • G06K9/00
    • G06K9/00362G06K9/00255G06T7/215G06T2207/20021G06T2207/30076G06T2207/30196G06T2207/30242
    • A method of controlling a function of a device, includes obtaining a sequence (19;34;48) of digital images taken at consecutive points in time. At least one measurement zone (25) including a plurality of image points is selected. For at least one measurement zone (25), a signal (30;41;55) representative of at least variations in a time-varying value of a combination of pixel values at at least a number of the image points is obtained and at least one characteristic of the signal (30;41;55) within at least a range of interest of its spectrum relative to comparison data is determined. The determination comprises at least one of: (i) determining whether the signal (30;41;55) has a spectrum with a local maximum at a frequency matching a comparison frequency to a certain accuracy; and (ii) determining whether at least a certain frequency component of the signal (30;41;55) is in phase with a comparison signal to a certain accuracy. The function is controlled in dependence on whether the determination is positive.
    • 在连续的时间点拍摄的数字图像的控制装置的功能,包括获得一个序列的方法(48 19; 34)。 包括图像的点的多个至少一个测量区域(25)被选择。 对于至少一个测量区域(25),信号(30; 41; 55)代表的以在至少一些图像点的像素值的组合的一个随时间变化的值至少变化获得并至少 所述信号的一个特性(30; 41; 55)的至少一个的范围内,以比较数据频谱相对其感兴趣内确定性开采。 确定包括至少一个:(i)确定的采矿无论信号(30; 41; 55)具有在相匹配的比较频率,以一定的精度的频率的局部最大值的频谱; 和(ii)确定的采矿无论信号的至少一定的频率分量(30; 41; 55)与比较信号到一定的精度相。 该功能依赖于控制是否确定是肯定的。