Electronic trapping system for digitized text and images
Patent 5581667 Issued on December 3, 1996. Estimated Expiration Date: 
December 23, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 23, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesApplying traps to a printed page specified in a page description language format Method for determining color boundaries for correcting for plate misregistration in color printing Patent #: 5313570 InventorAssigneeApplicationNo. 363082 filed on 12/23/1994US Classes:358/1.9, Attribute control358/501, Image reproduction358/515, Color separation358/540, Composite image382/257, Dilation or erosion (e.g., opening or closing)382/264, Lowpass filter (i.e., for blurring or smoothing)382/265Recursive filterExaminersPrimary: Rogers, Scott A.International ClassesH04N 001/58G06T 005/30 AbstractA system for digitally trapping color images on a pixel-by-pixel is employed, whereby for each cyan, yellow, magenta and black color separation, an object-oriented trapping process is carried out. After each object is categorized, the original image is separated into a first copy and a second copy. Edge blurring is performed on the edges of the first copy of the original image; masking of a border region is completed on the second copy of the original image according to a laplacian filter, a difference recursive filter or other method. A merged image is created by combining the blurred edge first copy of the image with the mask bordered second copy of the original image; the mask is thereafter removed from the merged image.Other References
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