In the change selection manner which does change selection the change selection manner which uses

摘要

PPROBLEM TO BE SOLVED: To provide a method that detects changes, such as new object appearances and existing object disappearances, in an outdoor scene in distinction from density value changes due to varying environment light, when extracting changes between images of the same scene photographed at different times. PSOLUTION: The method is for change extraction based on a two-dimensional density histogram of two images. The method creates a two-dimensional density histogram using density values I1 and I2 as two axes to represent a frequency distribution of a density value pair (I1(x),I2(x)) for the same coordinate value x of two images, creates a two-dimensional table Sig(I1,I2) describing combinations of the density values I1 and I2 covered by frequency distribution clusters formed on the density histogram which are classified into "insignificant" changes and the remaining "significant" changes according to characteristics of the clusters, and classifies the pixel density values (I1(x),I2(x)) for the coordinate value x as significant or insignificant pixels by reference to the table to extract change areas. PCOPYRIGHT: (C)2008,JPO&INPIT