Image processing appartus.

摘要

An image processing apparatus disclosed herein comprises an unsharp signal generating means (24) for processing image signals S obtained from continuous-tone images for average so as to generate unsharp signals U, a weighted parameter generating means (26) for generating weighted parameters P and Q according to the level of the image signals S and the level of the unsharp signals U and an image signal producing means (28) for producing an image signal T according to the following equation: T= P . U + Q . S where S is an image signal, U is an unsharp signal and P and Q are weighted parameters. The unsharp signal generating means (24) comprises an addition averaging circuit for adding the image signals S corresponding to an even number of pixels arranged to form a continuous-tone image to be scanned in a main scanning direction and for processing the added signals for average, thereby to generate unsharp signals U. The unsharp signal generating means includes a look-up (26) table for establishing the weighted parameters P and Q according to increase in the level of either one of an image signal S and an unsharp signal U and for selecting the weighted parameters P and Q corresponding to the level of the image signal S and unsharp signal U.