Patent ID: 8593657
Filing Date: 2013-11-26
Classification: G06K,H04N

Abstract:
1. An image processing apparatus comprising: a similarity evaluating section for detecting, out of input image data, an image pattern similar to a printing-prohibited pattern, and evaluating similarity between the image pattern thus detected and the printing-prohibited pattern, the similarity evaluating section including a specific color detecting section for detecting, out of the input image data, color image data of a specific color of the image pattern, the specific color detecting section including: a comparing section for comparing, with reference thresholds, color densities of color image data of plural colors in the input image data, so as to judge whether or not the input image data include the color image data of the specific color of the image pattern; and a threshold setting section for setting calculated thresholds or theoretical thresholds as the reference thresholds, wherein the threshold setting section sets a calculated threshold as a reference threshold if the calculated threshold is within an allowable range of the theoretical threshold, and the threshold setting section sets a theoretical threshold as a reference threshold if the calculated threshold is out of the allowable range of the theoretical threshold, the threshold setting section being configured to calculate out the calculated thresholds for the reference thresholds from reference image data obtained by reading out a reference chart having a plurality of colors in predetermined color densities, and the threshold setting section being configured to work out the theoretical thresholds for the reference thresholds according to the predetermined color densities of the reference chart.