Scanning device, image-forming apparatus, and scanning method

A scanning device, comprising:

• a memory storing instructions;
• and
• a processor coupled to the memory and, when executing the instructions, configured to:
• collect, by a first sensor, first image data of a to-be-scanned document;
• have a first channel corresponding to the first sensor;
• configured to collect, by a second sensor, second image data of the to-be-scanned document;
• have a second channel corresponding to the second sensor;
• and
• acquire image data alternately from the first channel and the second channel to acquire a pixel of the first image data from the first channel and a pixel of the second image data from the second channel by using a pixel-by-pixel acquisition mode for each of the first and second channels in one acquisition cycle,
• wherein:
• a selection frequency when selecting a channel is greater than or equal to twice of an output frequency of the first sensor;
• or the selection frequency when selecting the channel is greater than or equal to twice of an output frequency of the second sensor;
• the processor is further configured to:
• remap the image data acquired from the first sensor and the second sensor according to an acquisition sequence to acquire a first image-data series and a second image-data series,
• wherein:
• the first image-data series includes the first image data arranged according to the acquisition sequence;
• and the second image-data series includes the second image data arranged according to the acquisition sequence;
• and
• determine a first time point and a second time point,
• wherein the first time point is when the to-be-scanned document leaves the first sensor and the second time point is when the to-be-scanned document reaches the first sensor;
• delete one or more pixels of the first image data in the first image-data series collected by the first sensor after the first time point;
• and
• delete one or more pixels of the second image data in the second image-data series collected by the second sensor before the second time point.