Liquid discharge apparatus, liquid discharge method, and recording medium

A liquid discharge method comprising:

• forming, with a liquid discharged from a recording head, a plurality of first markers including at least two first markers at a constant pitch while moving the recording head relative to a recording medium in a head movement direction;
• forming a plurality of second markers at a pitch that is an integral multiple of the constant pitch of the plurality of first markers to form the plurality of second markers at some positions of the plurality of first markers, the plurality of second markers including a second marker overlaid with one of the at least two first markers to form a pattern including a reference marker formed with one of the at least two first markers and a measurement marker in which the second marker is overlaid on another of the at least two first markers;
• reading, with a sensor, the pattern;
• and
• measure a distance between the reference marker and the measurement marker in the head movement direction based on information obtained by the reading.

A non-transitory recording medium storing a plurality of program codes which, when executed by one or more processors, causes the processors to perform a method, the method comprising:

• forming, with a liquid discharged from a recording head, a plurality of first markers including at least two first markers at a constant pitch while moving the recording head relative to a recording medium in a head movement direction;
• forming a plurality of second markers at a pitch that is an integral multiple of the constant pitch of the plurality of first markers to form the plurality of second markers at some positions of the plurality of first markers, the plurality of second markers including a second marker overlaid with one of the at least two first markers to form a pattern including a reference marker formed with one of the at least two first markers and a measurement marker in which the second marker is overlaid on another of the at least two first markers;
• reading, with a sensor, the pattern;
• and
• measure a distance between the reference marker and the measurement marker in the head movement direction based on information obtained by the reading.