Inkjet printing system and method capable of automatically calibrating a non-uniform speed of a printhead carriage

An inkjet printing method for automatic calibration relating to non-uniform speed of a printhead carriage, comprising the steps of:

• (A) receiving an automatic calibration request;
• (B) printing at least one test pattern on a recording medium at a special print mode according to the automatic calibration request;
• (C) capturing an image of the test pattern from the recording medium, and analyzing the image to accordingly generate a look-up table;
• and
• (D) adjusting a clock of an inkjet control signal for the printhead carriage in accordance with the look-up table to thereby output an adjusted inkjet control signal to the printhead carriage for performing the automatic calibration.

An inkjet printing system capable of automatically calibrating non-uniform speed of a printhead carriage, including:

• a test pattern generator, which generates at least one test pattern;
• a printing device, which is connected to the test pattern generator in order to print the at least one test pattern on a recording medium;
• an image extractor, which captures an image of the test pattern from the recording medium;
• a processor, which is connected to the image extractor in order to read and analyze the image of the test pattern to accordingly generate a look-up table;
• a printhead carriage control signal generator, which receives an encoder signal with respect to a printhead travel and generates an inkjet control signal for the printhead carriage in accordance with the encoder signal;
• and
• a look-up table device, which is connected between the processor and the printhead carriage control signal generator in order to receive the look-up table generated and accordingly adjusts a clock of the inkjet control signal to thereby generate an adjusted encoder signal.