Patent ID: 11863725
Assignee: NEC PLATFORMS, LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  G | IPC H

Claim 6:
7. An image reading control method comprising:
by an information processing device,
controlling a plurality of light sources in such a way as to turn on only a specific light source among the plurality of light sources;
acquiring a diffusion state of a first reflected light generated by turning on of the specific light source, as a luminance of the first reflected light with respect to a position for acquiring the first reflected light, in a state where general shading correction data not dependent on a target to be read for an image is generated;
acquiring a diffusion state of a second reflected light generated by the specific light source irradiating the target to be read with light, as a luminance of the second reflected light with respect to a position for acquiring the second reflected light;
calculating a first ratio between a width of a range, regarding the position for acquiring the first reflected light, in which the luminance of the first reflected light is equal to or larger than a first threshold value, and a width of a range, regarding the position for acquiring the first reflected light, in which the luminance of the first reflected light is equal to or larger than a second threshold value smaller than the first threshold value;
calculating a second ratio between a width of a range, regarding the position for acquiring the second reflected light, in which the luminance of the second reflected light is equal to or larger than the first threshold value, and a width of a range, regarding the position for acquiring the second reflected light, in which the luminance of the second reflected light is equal to or larger than the second threshold value; and
generating dedicated shading correction data dependent on the target to be read based on the diffusion state of the first reflected light, the diffusion state of the second reflected light, a difference between the first ratio and the second ratio and the general shading correction data.