Apparatus, method and program for detecting a difference between a current image and a previous image

摘要

An image processing apparatus is disclosed which includes: an acquisition section configured to acquire image data of an image; a histogram calculation section configured to calculate a histogram of the acquired image data; a histogram storage section configured to store the calculated histogram that is updated sequentially; and a change determination section configured to determine whether a change has occurred in the acquired image based on the degree of similarity between the calculated histogram and the previously stored histogram.

主权项

1. An image processing apparatus comprising:
acquisition means for acquiring image data of a number of images, each image representative of a video frame; division means for dividing the acquired image data of a respective video frame into a plurality of blocks; histogram calculation means for calculating a histogram of a designated one or ones of the plurality of blocks of the respective video frame; histogram storage means for storing the calculated histogram; and change determination means for determining whether a change has occurred in a respective image based on a degree of similarity between the calculated histogram of said designated one or ones of the plurality of blocks of the respective video frame and a previous histogram of the corresponding one or ones of the plurality of blocks of a previous video frame from storage in the histogram storage means; and alarm output means for counting a number of blocks of the respective image in which a change is determined to have occurred and for outputting an alarm if a comparison between the counted number and an alarm threshold value reveals that the counted number is above said alarm threshold value.