Patent ID: 8988732
Filing Date: 2015-03-24
Classification: H04N

Abstract:
1. An image processing apparatus that handles image data, comprising: a dividing unit for dividing image data into large blocks of a prescribed size and further subdividing the large blocks into multiple smaller blocks; a large block isolated point calculation unit for calculating a first number of isolated points contained in each large block established by said dividing unit; a small block isolated point calculation unit for calculating a respective second number of isolated points contained in each small block established by said dividing unit; and a halftone-dot region determination unit for determining that a specified large block among the large blocks established by the dividing unit is a halftone-dot region if all small blocks in the specified large block have an isolated point contained therein, based on the respective second numbers calculated by the small block isolated point calculation unit, and if the first number of isolated points calculated to be contained in the specified large block by the large block isolated point calculation unit is greater than or equal to a first prescribed value.