In order to the monochromatic conversion of an image, in an image processing
apparatus
(1a), the color used within the image inputted from an image inputting
section (2) is determined by a color analyzing section (3), the mixing-ratio
of the color components of the image is defined based on the color by a mixing-ratio
calculating section (4), the color components are mixed according to the
mixing-ratio by an image converting section (5) thereby converting the input
image to a monochromatic image, and it is outputted from an image outputting section
(6). Further, in order to contract an composite image comprising a character,
a line drawing, and a halftone dot, an image processing apparatus (21a)
comprises an image inputting section (22), a character/line drawing region
extracting section (23) for an input image, a pseudo-density region extracting
section (24) for the input image, an image contracting section (25)
for contracting the image using different methods respectively in the pseudo-density
region, the character/line drawing region, and the other region, and an image outputting
section (26) for outputting the image. Furthermore, in order to eliminate
a ghost image, in an image processing apparatus (31a), front and
back images are inputted from an image inputting section (32), an image
reversing section (33a) reverses it, a positional relationship detecting
section (34) detects the positional relationship, an image correcting section
(35) corrects the image as to eliminate a ghost image, an image reversing
section (33b) reverses it again, and an image outputting section
(36). Further, in order to align the image position, in an image processing
apparatus (50), the alignment of the images of the consecutive pages from
among the images inputted page by page from the image inputting section (51)
is carried out by a page contour detecting section (52), a page contents
region extracting section (53), an inclination correcting section (54),
and page information processing section (57), and it is outputted from the
image outputting section (56).
