Image processing apparatus and image processing method

摘要

An image processing apparatus includes an input unit for inputting image data, an attribute information generation unit for generating attribute information about each pixel of the image data, a block division unit for dividing the image data into a plurality of blocks of a predetermined size, a histogram generation unit for generating a histogram of colors and the number of pixels of each color existing in a focused block divided by the division unit, and a color replacement unit, if it is not determined that the area having the focused color is a significant area, for replacing a color of a pixel existing within the area having the focused color with a different color so that the color of the area having the focused color becomes the same as the color of another area contacting the area having the focused color and having the different color according to a predetermined condition.

主权项

1. An image processing apparatus comprising:
an input unit configured to input image data; an attribute information generation unit configured to generate attribute information about each pixel of the image data input by the input unit; a division unit configured to divide the image data input by the input unit into a plurality of blocks of a predetermined size; a generation unit configured to generate a histogram of colors and the number of pixels of each color existing in a focused block divided by the division unit; a first determination unit configured, if a size of an area having a focused color calculated based on the histogram generated by the generation unit is greater than a predetermined threshold value, to determine that the area having the focused color is a significant area; a second determination unit configured, if the size of the area having the focused color is equal to or less than the predetermined threshold value, if the area having the focused color is located on a boundary of the focused block, and if the attribute information generated by the attribute information generation unit about successive pixels existing within the area having the focused color and located on the boundary includes a text attribute, to determine that the area having the focused color is a significant area; and a color replacement unit configured, if it is not determined by either one of the first determination unit and the second determination unit that the area having the focused color is the significant area, to replace a color of the pixel existing within the area having the focused color with a different color so that the color of the area having the focused color becomes the same as the different color of another area within the focused block contacting the area having the focused color, wherein the color replacement unit does not replace the color of the pixel existing within the area having the focused color determined as the significant area with the different color of another area within the focused block contacting the area having the focused color.