Patent ID: 6243500
Filing Date: 2001-06-05
Classification: H04N

Abstract:
An image processing apparatus which processes image data in one of a character image reading mode and a character/photo mixed-image reading mode, said apparatus comprising:an MTF filter which emphasizes said image data;a smoothing filter which smooths said image data;a memory which stores white data;a mesh-screen image judging device which judges whether said image data is a mesh-screen image in said character image reading mode and said character/photo mixed-image reading mode;an isolated-pixel judging device which judges whether said image data is an isolated-pixel so as to make an isolated-pixel erasing ability strong when said mesh-screen image judging device judges said image data to be a non-mesh-screen image; and which judges whether said image data is an isolated-pixel so as to make said isolated-pixel erasing ability weak when said mesh-screen image judging device judges said image data to be a mesh-screen image;a first selection device which selects an output of said MTF filter when said isolated-pixel judging device judges said image data to be a non-isolated-pixel; which selects said white data when said isolated-pixel judging device judges said image data to be an isolated-pixel, and which produces an output; anda second selection device that selects said output of said first selection device when said mesh-screen image judging device judges said image data to be a non-mesh-screen image and which selects an output of said smoothing filter when said mesh-screen image judging device judges said image data to be a mesh-screen image.