Patent ID: 11956394
Assignee: SEIKO EPSON CORPORATION
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC G  H

Claim 1:
2. The reading device according to claim 1, wherein
the reading sensor includes a plurality of image sensors aligned in a main scanning direction, and a background plate read as a background together with a document by the plurality of image sensors,
the controller
acquires a background estimation value indicating a luminance value estimated to be acquired when the plurality of image sensors read the background plate,
sets, as a minimum value of the first background range, a luminance value obtained by subtracting a first margin from a minimum value of the background estimation value,
sets, as a minimum value of the second background range, a luminance value obtained by subtracting a second margin from the minimum value of the background estimation value, and
the second margin is a value greater than the first margin.