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    • 1. 发明申请
    • METHOD AND SYSTEM FOR IMAGE ANALYSIS
    • WO2011021128A3
    • 2011-02-24
    • PCT/IB2010/053588
    • 2010-08-09
    • KONINKLIJKE PHILIPS ELECTRONICS N.V.JEANNE, VincentKIRENKO, Ihor OlehovychCENNINI, GiovanniSHAO, Ling
    • JEANNE, VincentKIRENKO, Ihor OlehovychCENNINI, GiovanniSHAO, Ling
    • G06K9/00
    • A method of image analysis, includes: obtaining a sequence (37;51) of images, each represented by pixel data; performing a vision-based analysis on at least one of the sequence (37;51) of images to obtain data for classifying a state of a subject represented in the images; - determining at least one value of a physiological parameter of a living being represented in at least some of the sequence (37;51) of images; and classifying a state of the subject using the data obtained with the vision-based analysis and the at least one value of the physiological parameter. The at least one value of the physiological parameter is determined through analysis of image data from the same sequence (37;51) of images from which the at least one image on which the vision-based analysis is performed is taken. A method of enabling remote photoplethysmographic analysis includes: obtaining a sequence (37;51) of images from at least one camera (3), each represented by pixel data representative of reflected ambient light in at least a limited range of wavelengths; and, for at least one measurement zone (41), providing a signal representative of at least variations in a time-varying value of a combination of pixel values at at least a number of image points in the measurement zone (41) for use in determining at least one value of a physiological parameter. At least part of a selected subject represented in the sequence (37;51) of images is tracked, and a directable light source (4) illuminating at least part of the selected subject is controlled.
    • 5. 发明申请
    • CONTROLLING AN AMOUNT OF FILTERING
    • 控制一定量的过滤
    • WO2007141727A2
    • 2007-12-13
    • PCT/IB2007/052081
    • 2007-06-04
    • KONINKLIJKE PHILIPS ELECTRONICS N.V.SHAO, Ling
    • SHAO, Ling
    • G06T5/20
    • G06T5/008G06T5/40
    • A control method controls an amount of filtering (LPF) of a particular pixel (Pc) of an image dependent on information content (IC) of a local region (R) of the particular pixel (Pc). The control method determines the information content by using a probability density function (PDF) defining a probability distribution of a local descriptor, such as pixel values (PVij) in the local region (R). The amount of filtering (LPF) is controlled in response to the information content (IC) to obtain a different amount of filtering in a local region (R) having a more spread out probability density function (PDF) than in a local region (R) having a less spread out, more peaked probability function (PDF).
    • 控制方法控制取决于特定像素(Pc)的局部区域(R)的信息内容(IC)的图像的特定像素(Pc)的滤波量(LPF)。 控制方法通过使用定义局部描述符的概率分布的概率密度函数(PDF)来确定信息内容,例如局部区域(R)中的像素值(PVij)。 响应于信息内容(IC)来控制滤波量(LPF),以在具有比局部区域(R)更大的扩展概率密度函数(PDF)的局部区域(R)中获得不同的滤波量 )具有较小的扩展,更高峰概率函数(PDF)。