Patent ID: 6049635
Filing Date: 2000-04-11
Classification: H04N

Abstract:
A dotted image area detecting apparatus for detecting a dotted image area in an image on the basis of image data representing each of densities of a plurality of pixels constituting the image, comprising:setting means for setting a detecting area including a predetermined number of pixels;gray level judging means for judging which of a high gray level, a medium gray level and a low gray level is a gray level of an image in the vicinity of the detecting area on the basis of the image data;means for detecting a peak pixel in the detecting area as a peculiar point pixel if the gray level judging means judges that the gray level in the vicinity of the detecting area is the low gray level;means for detecting a dip pixel in the detecting area as a peculiar point pixel if the gray level judging means judges that the gray level in the vicinity of the detecting area is the high gray level;means for detecting the peak pixel and the dip pixel in the detecting area as a peculiar point pixel if the gray level judging means judges that the gray level in the vicinity of the detecting area is the medium gray level; andjudging means for judging whether or not the detecting area set by the setting means belongs to a dotted image area on the basis of a peculiar point pixel density in the detecting area.