Patent ID: 8514418
Filing Date: 2013-08-20
Classification: H04N

Abstract:
1. A line width measuring device comprising: an acquisition unit that acquires a binary image that is obtained by reading a medium having a line width sample printed thereon with an image reading device, the line width sample representing output characteristics regarding a line width of an image forming device; an extraction unit that extracts a displacement amount of steps that are repeatedly generated in an image corresponding to the line width sample in the binary image by reading the medium with the image reading device in an orientation such that the line width sample has an angle θ (0°<θ<90°)with respect to a main scanning direction of image reading; a generation unit that generates line width information regarding a width of the line width sample by using the displacement amount extracted by the extraction unit; a detection unit that detects the angle θ on the basis of the binary image acquired by the acquisition unit; a determination unit determines whether or not a difference between the angle θ detected by the detection unit and a reference angle is equal to or smaller than a predetermined threshold, the reference angle being predetermined as an angle that the line width sample is expected to have with respect to the main scanning direction; and an instruction unit that instructs the image reading device to reread the medium if it is determined that the difference is not equal to or smaller than the threshold by the determination unit, wherein the extraction unit additionally extracts a period of steps that are repeatedly generated in an image corresponding to the line width sample in the binary image by reading the medium with the image reading device in an orientation such that the line width sample has an angle θ (0°<θ<90°) with respect to a main scanning direction of image reading; and the generation unit generates line width information regarding a width of the line width sample by using the period extracted by the extraction unit.