Print data processing method, print data processing device, and recording medium having recorded therein print data processing program

A print data processing method for processing print data obtained by performing a rasterization process on vector data, the method comprising:

• a matching processing step of performing pattern matching between a streak detection pattern including a streak pattern having a width of one pixel and extending in a first direction or a second direction perpendicular to the first direction, and the print data;
• a length measurement step of determining, when matching is established in the matching processing step, a length of a streak candidate part including a part corresponding to a streak pattern in a region where matching is established and a part continuous in an extending direction of the streak pattern and having a same value as a data value of the streak pattern, in the print data;
• a determination step of determining whether or not the streak candidate part is streak data that possibly results in a streak, by comparing the length determined in the length measurement step against a predetermined threshold;
• and
• a correction step of correcting a data value of each pixel constituting the streak data, based on a data value of a neighboring pixel, wherein
• the print data is multi-valued bitmap data, and
• in the correction step, the data value of each pixel constituting the streak data is corrected to a value that is calculated by a filtering process that is performed by using data values of surrounding pixels.

A print data processing method for processing print data obtained by performing a rasterization process on vector data, the method comprising:

• a matching processing step of performing pattern matching between a streak detection pattern including a streak pattern having a width of one pixel and extending in a first direction or a second direction perpendicular to the first direction, and the print data;
• a length measurement step of determining, when matching is established in the matching processing step, a length of a streak candidate part including a part corresponding to a streak pattern in a region where matching is established and a part continuous in an extending direction of the streak pattern and having a same value as a data value of the streak pattern, in the print data;
• a determination step of determining whether or not the streak candidate part is streak data that possibly results in a streak, by comparing the length determined in the length measurement step against a predetermined threshold;
• and
• a streak detection result display step of displaying an image based on the print data while emphasizing the streak data.

A print data processing device for processing print data obtained by performing a rasterization process on vector data, the device comprising:

• a processor;
• and
• a memory storing programs, the programs, which when executed by the processor, cause the processor to function as:
• a matching processing unit configured to perform pattern matching between a streak detection pattern including a streak pattern having a width of one pixel and extending in a first direction or a second direction perpendicular to the first direction, and the print data;
• a length measurement unit configured to determine, when matching is established by the pattern matching by the matching processing unit, a length of a streak candidate part including a part corresponding to a streak pattern in a region where matching is established and a part continuous in an extending direction of the streak pattern and having a same value as a data value of the streak pattern, in the print data;
• a determination unit configured to determine whether or not the streak candidate part is streak data that possibly results in a streak by comparing the length determined by the length measurement unit against a predetermined threshold;
• and
• a result display unit configured to display a screen indicating that the streak data is not detected when the streak data is not detected by the determination unit, and to display an image so that a user is enabled to grasp the position of the streak data in the image when the streak data is detected by the determination unit.