Accurate overprinting method for printing envelope postal codes

Abstract

The invention relates to an accurate overprinting method for printing envelope postal codes, which comprises the steps of: capturing an envelope image in real time by a camera; extracting gray level information and red domain information; approximating the gray level information to be a segment; seeking an envelope edge; establishing and updating an envelope edge model according to the continuity of continuously collected images; generating a code red box according to the red domain information; computing whether an average distance delta y between the successfully matched red box and the envelope edge model is within an allowable range of an envelope standard or not; if delta y is within the allowable range of the envelope standard, judging again whether a sequence number of the red box is 1 or not; if the sequence number of the red box is 1, emitting a command of printing a first postal code character in a current position to an envelope printer; if the sequence number of the red box is not 1, computing a distance delta n between the current red box Rn and the previous red box Rn-1; judging that delta n conforms to the envelope standard; and controlling the envelope printer to print corresponding postal code characters in the current position. In the accurate overprinting method, the interference of external factors is effectively eliminated with high control accuracy.

Description

technical field

[0001] The invention relates to a printing control method for envelope postal codes. Background technique

[0002] In general, in order to ensure that the letters flow according to the designed route, each letter needs to go through several sorting and transshipment between receiving and posting and successfully completing the delivery work.

[0003] At present, a large number of automatic sorting systems equipped are based on machine vision recognition of postal codes. The envelope standard GB / T1416-2003 stipulates that the area for filling in the zip code is located at a specific position on the envelope, refer to figure 1 , and everyone is separated and limited by a golden red (PANTONE 1795C) box, and it is also stipulated that no other red information may appear in this area. In order to improve the speed and accuracy of machine recognition, the recognition part of the automatic sorting system always automatically finds the area with the characteristics...

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