Image conversion apparatus and method reducing number of pixel counts processing

摘要

An image conversion apparatus extracts from among pixel rows parallel to an object pixel row, a first pixel row overlapping an aperture shape; and further extracts a second pixel row having the number of pixels successively overlapping the aperture shape equal to or greater than that of the first pixel row. The image conversion apparatus calculates a value of a second pixel in the case of converting an original image, by referring to a storage unit that stores a value of a first pixel in the case of converting the original image. For example, the image conversion apparatus defines an average of the value of the first pixel in the case of converting the original image, a value of a diffusion source pixel (IN[5][2]), and a diffusion source pixel (IN[5][3]) as the value of the second pixel in the case of converting the original image.

主权项

1. A non-transitory, computer-readable recording medium storing therein an image conversion program that causes a computer to execute a process comprising:
extracting, among pixel rows parallel to an object pixel row in an image to be converted, a first pixel row overlapping a region formed of a pixel group within a predetermined range from a given pixel of the object pixel row and a second pixel row having a number of pixels successively overlapping the region equal to or greater than that of the first pixel row; acquiring a pixel count from a pixel at an end of a first pixel group that is included in the region and the extracted first pixel row, to a first pixel included in the first pixel group, the end being an end point in a given direction that is any one among a scanning direction of the object pixel row and a direction opposite to the scanning direction; identifying a second pixel by advancing from the pixel at the end in a second pixel group that is included in the region and the extracted second pixel row, in a direction opposite to the given direction, by the acquired pixel count; calculating a value of the second pixel in a case of converting an original image by referring to a storage device that stores therein a value of the first pixel in the case of converting the image; and identifying out of the object pixel row, a pixel that overlaps the given pixel after the given pixel is moved parallel to the object pixel row such that the second pixel is included in a region formed of the pixel group within the predetermined range from the given pixel after the given pixel is moved parallel to the object pixel row, wherein the calculating the value of the second pixel includes calculating the value of the second pixel in the case of converting the image, based on the value of the first pixel in the case of converting the image and a value of the identified pixel.