Patent ID: 8559082
Filing Date: 2013-10-15
Classification: H04N

Abstract:
1. An image processing apparatus comprising: a receiving unit configured to receive multi-level image data; an integer-part converting unit configured to receive the multi-level image data from the receiving unit and convert the multi-level image data into integer image data by referring to a first conversion table, the first conversion table containing data for converting the multi-level image data into the integer image data by discarding decimal parts of the multi-level image data subjected to gamma correction; a threshold setting unit configured to receive the multi-level image data from the receiving unit and generate matrix data for performing area coverage modulation by referring to the multi-level image data; a decimal-part converting unit configured to receive the multi-level image data from the receiving unit and convert the multi-level image data into decimal image data by referring to a second conversion table, the second conversion table containing data for converting the multi-level image data into the decimal image data by multiplying decimal parts of the multi-level image data subjected to gamma correction by the matrix data generated in the threshold setting unit; a level reducing unit configured to receive the decimal image data from the decimal-part converting unit and reduce levels of the decimal image data by using a threshold generated in the threshold setting unit; an adding unit configured to receive the integer image data from the integer converting unit and receive level-reduced decimal image data from the level reducing unit, add the integer image data to the level-reduced decimal image data, and output a result of addition as gamma conversion image data; and an image processing unit configured to receive the gamma conversion image data from the adding unit and perform image processing on the gamma conversion image data.