Multifunction peripheral, control method thereof, and storage medium storing program

A control method of controlling a multifunction peripheral including a conveyance roller, a print engine, and a scanner, the control method comprising:

• driving the conveyance roller to convey a recording medium and controlling the print engine to record, on the recording medium, a test image based on test image data with recording agent;
• after recording the test image, controlling the scanner to generate scan data of the test image recorded on the recording medium;
• after generating the scan data, extracting stain data based on the scan data and the test image data, the extracting the stain data comprising:
• removing the test image data from the scan data to obtain intermediate data:
• dividing the intermediate data into a plurality of division data corresponding to each rotation cycle of the conveyance roller;
• and
• superposing the plurality of division data to obtain the stain data, wherein the stain data comprises a pattern of a stain;
• after extracting the stain data, removing the stain data from the scan data to generate correction data;
• and
• executing particular processing by using the correction data,
• wherein the stain data indicates the stain caused by transfer of the recording agent from the conveyance roller to the recording medium.

A non-transitory computer-readable storage medium storing a program including computer-readable instructions for a multifunction peripheral including a conveyance roller, a print engine, and a scanner, the computer-readable instructions, when executed by a controller of the multifunction peripheral, causing the multifunction peripheral to perform:

• driving the conveyance roller to convey a recording medium and controlling the print engine to record, on the recording medium, a test image based on test image data with recording agent;
• after recording the test image, controlling the scanner to generate scan data of the test image recorded on the recording medium;
• after generating the scan data, extracting stain data based on the scan data and the test image data, the extracting the stain data comprising:
• removing the test image data from the scan data to obtain intermediate data:
• dividing the intermediate data into a plurality of division data corresponding to each rotation cycle of the conveyance roller;
• and
• superposing the plurality of division data to obtain the stain data, wherein the stain data comprises a pattern of a stain;
• after extracting the stain data, removing the stain data from the scan data to generate correction data;
• and
• executing particular processing by using the correction data,
• wherein the stain data indicates the stain caused by transfer of the recording agent from the conveyance roller to the recording medium.