Image processing apparatus, image processing method, and program

Abstract

In order to eliminate image deterioration based on the characteristics of an output device upon execution of edge emphasis processing, an image processing apparatus includes a setting unit which sets a print characteristic on the print medium, a region setting unit which sets a region, a brightness value derivation unit which derives brightness values, a first derivative derivation which derives first derivatives of the brightness values, an edge direction determination unit which determines an edge direction of brightness, an emphasis level determination unit which determines an emphasis level of a pixel value based on the first derivatives, and a replacement unit which calculates second derivatives of brightness values and replaces a pixel value of a pixel of interest based on the sign of the second derivative.

1 - 14 . (canceled) 
     
     
         15 . An image processing apparatus comprising:
 an acquiring unit configured to acquire information on at least one of information concerning the type of ink and information concerning the type of print medium, which are used to print image data to be processed; and   a correction unit configured to correct signal values, which correspond to a plurality of colors, of a pixel in a region corresponding to an edge of an image included in the image data,   wherein the correction unit changes a correction intensity for correcting the signal values based on the acquired information.   
     
     
         16 . The image processing apparatus according to  claim 15 , wherein the correction unit corrects the signal values of the pixel of interest based on signal values of each of a plurality of pixels which exist within the region and include the pixel of interest. 
     
     
         17 . The image processing apparatus according to  claim 16 , wherein the correction unit derives, for each of the plurality of pixels, a brightness value based on the signal values, and the correction intensity to be changed by the correction unit indicates the degree indicating whether the signal values of the pixel of interest should be changed to the signal values of a pixel having a maximum brightness value in the plurality of pixels or the signal values of a pixel having a maximum brightness value in the plurality of pixels. 
     
     
         18 . The image processing apparatus according to  claim 16 , wherein the correction intensity to be changed by the correction unit indicates the degree indicating whether the signal values of the pixel of interest should be changed to the signal values indicating a white color or the signal values indicating a black color. 
     
     
         19 . An image processing method comprising the steps of:
 acquiring information on at least one of information concerning the type of ink and information concerning the type of print medium, which are used to print image data to be processed; and   correcting signal values, which correspond to a plurality of colors, of a pixel in a region corresponding to an edge of an image included in the image data,   wherein the correcting step changes a correction intensity for correcting the signal values based on the acquired information.