@article{oai:ipsj.ixsq.nii.ac.jp:00060134,
 author = {Issei, Yamasaki and Issei, Yamasaki},
 issue = {0},
 journal = {Information Processing in Japan},
 month = {Jan},
 note = {This paper deals with a method for setting of the threshold value when printed images are transformed into two-valued black and white patterns. A 'model' stroke which has gray levels is constructed  considering the allowable limit of strokewidth variations. It is theoretically clarified that the threshold value is the average of the values of black and white portions. The article includes discussions on the reliability of bases for the threshold value., This paper deals with a method for setting of the threshold value when printed images are transformed into two-valued black and white patterns. A 'model' stroke which has gray levels is constructed, considering the allowable limit of strokewidth variations. It is theoretically clarified that the threshold value is the average of the values of black and white portions. The article includes discussions on the reliability of bases for the threshold value.},
 pages = {152--157},
 title = {A Method for Two-valuing of Printed Images},
 volume = {15},
 year = {1975}
}