Patent ID: 11956392
Assignee: RICOH COMPANY, LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  B | IPC B  H

Claim 1:
2. The image forming apparatus according to claim 1,
wherein
the program instructions further cause the processor to
detect the edge of the recording medium based on a first threshold set between a brightness value of a line detected by the image reader before the edge of the recording medium being conveyed to the image reader reaches the image reader and a brightness value of a background color of the recording medium, and
calculate a position of the edge in the width of the edge line based on a product of a ratio and a detected value difference, the ratio being a ratio between (i) a difference between a brightness value of the edge line and a brightness value of an immediately preceding edge line that is a line immediately preceding the edge line and (ii) a difference between the brightness value of the immediately preceding edge line and the first threshold, the detected value difference being a difference between (iii) a detected value output from the detector corresponding to the edge line and (iv) a detected value output from the detector corresponding to the immediately preceding edge line.