METHODS FOR EXTRACTION AND RECOGNITION OF PATTERN IN AN IMAGE, METHOD FOR IMAGE ABNORMALITY JUDGING, AND MEMORY MEDIUM WITH IMAGE PROCESSING PROGRAMS

A method for extracting a pre-selected pattern from an image by a programmed computer is able to identify and extract the pattern even under adverse conditions such as presence of noise or shadow in the image or the target pattern is partially shielded. The steps are: storing reference patterns for referencing; storing input images; applying filtering processes to reference patterns and input images; integrating filtered results of the reference pattern and filtered results of the input image to generate integrated results; and extracting a reference pattern according to the integrated results and specifying a location of the reference pattern in the input image. An image abnormality detection can also be performed using the basic method to identify a normal scene and detect a deviation from normalcy even under adverse conditions.