Patent ID: 6333993
Filing Date: 2001-12-25
Classification: G06K,G06T

Abstract:
A method of object detectable and background removal for enabling an object to be automatically detected minutely and accurately as far as contours comprising the steps of:using an image consisting of a virtually even background and an object of detection target as an input image, by way of an input process of said image;calculating a statistic in every respective sectional images, while dividing said input image into sectional images, by way of a statistic calculation process;selecting a sectional image including only said background based on said statistic calculated previously in said statistic calculation process, by way of a background only sectional image selection process;estimating a statistic of a whole picture from said statistic of said sectional image including only said background, by way of a statistic estimation process;determining a threshold in the whole picture from said estimated statistic, by way of a threshold determination process; andcomparing said threshold determined in the whole picture with said input image, by way of a comparison process, wherein said method causes said object of detection target to be isolated from said input image,wherein when said statistic estimation process estimates a mean value and a standard deviation of the prescribed characteristic value by way of the background in the sectional image except the background, if there exists the mean value and the standard deviation of the prescribed characteristic value of the sectional image including only the background located in the neighborhood and the mean value and the standard deviation of the prescribed characteristic value of the sectional image except the background estimated previously in said same neighborhood, thus estimating the mean value and the standard deviation by averaging above respective average values and the standard deviations, while if there does not exist them, estimating the mean value and the standard deviation of the prescribed characteristic value in another sectional images except the background, thus repeating estimation processing both of a mean value and a standard deviation of the prescribed characteristic value of said background until when it is capable of estimating a mean value and a standard deviation of the prescribed characteristic value of the background in the whole sectional images except the background.