Pattern noise removal device, pattern noise removal method, and pattern noise removal program

A pattern noise removal method for removing a background pattern noise having periodicity from a digital image, comprising:

• extracting candidate pixels that constitute the background pattern noise from pixels within the image based on density of each of the pixels;
• extracting a feature of a dot pattern formed by each of the candidate pixels and peripheral neighborhood pixels among the extracted candidate pixels;
• extracting a plurality of dot pattern areas including the periodic candidate pixels and neighborhood pixels having the feature of the dot pattern;
• and
• removing the periodic candidate pixels and neighborhood pixels included in the plurality of dot pattern areas as the background pattern noise.

A non-transitory computer readable recording medium storing a pattern noise removal program for removing a background pattern noise having periodicity from a digital image, the program causing a computer to execute:

• a function of extracting candidate pixels that constitute the background pattern noise from pixels within the image based on density of each of the pixels;
• a function of extracting a feature of a dot pattern formed by each of the candidate pixels and peripheral neighborhood pixels among the extracted candidate pixels;
• a function of extracting a dot pattern area including the periodic candidate pixels and neighborhood pixels having the feature of the dot pattern;
• and
• a function of removing the periodic candidate pixels and neighborhood pixels included in the dot pattern area as the background pattern noise.

A pattern noise removal device which removes a background pattern noise having periodicity from a digital image, comprising:

• candidate pixel extracting means for extracting candidate pixels that constitute the background pattern noise from pixels within the image based on density of each of the pixels;
• dot pattern feature extracting means for extracting a feature of a dot pattern formed by each of the candidate pixels and peripheral neighborhood pixels among the extracted candidate pixels;
• dot pattern area extracting means for extracting a dot pattern area including the periodic candidate pixels and neighborhood pixels having the feature of the dot pattern;
• and
• periodic pattern noise removal means for removing the periodic candidate pixels and neighborhood pixels included in the dot pattern area as the background pattern noise.