Patent ID: 8441688
Filing Date: 2013-05-14
Classification: H04N

Abstract:
1. An image processing apparatus for determining a centroid of a halftone dot and a number of blackened pixels in accordance with image data, comprising: a first calculator configured to calculate a centroid of a halftone dot to be processed from image data of pixels included in the halftone dot to be processed; a second calculator configured to calculate the number of blackened pixels from the image data of the pixels included in the halftone dot to be processed, wherein the number of blackened pixels indicates a number of pixels to be blackened among the pixels included in the halftone dot to be processed; an expander configured to expand the halftone dot by adding a pixel adjacent to the halftone dot to be processed to the halftone dot to be processed; and a determiner configured to make the first calculator, the second calculator, and the expander repeat their processes until the number of blackened pixels reaches a predetermined number so as to determine the centroid and the number of blackened pixels, wherein the expander adds a pixel, which is closest to the centroid of the halftone dot and is not included in the halftone dot, in a case where either a size of the halftone dot is less than a first size or the number of the blackened pixels is less than the predetermined number, the size of the halftone dot is less than a second size which is larger than the first size, and the first size and the second size are predetermined, and wherein at least one of the first calculator, the second calculator, and the determiner is implemented using a processor.