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AssigneeR. R. Donnelley & Sons Company
InventorsZhenhua Xie, Michael A. Rodriguez
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A system for converting a continuous tone value to an output value having either a first level or a second level develops a first error based upon the application of a separable filter to an output value having a first level assumed for the continuous tone value undergoing conversion. A second error is developed based upon the application of the separable filter to an output value having a second level assumed for the continuous tone value undergoing conversion. If the first error is greater than the second error, the continuous tone value is converted to the output value having the second level. Otherwise, the continuous tone value is converted to the output value having the first level. The resulting error is diffused in a predetermined manner to neighboring continuous tone values yet to be converted.
A system for converting one input value of a series of input values into an output value wherein previous input values have been converted to previous output values and subsequent input values are to be converted to output values, the system comprising:
A system for sequentially converting input values into corresponding output values so that, at a given instant in time, an input value undergoing conversion has before it input values previously converted to corresponding output values and after it subsequent input values yet to be converted to output values, the system comprising:
A method of converting input values to corresponding output values wherein an input value undergoing conversion has before it previously converted input values and after it input values yet to be converted and wherein each of the input values has one of at least M possible levels and each of the output values has one of N possible levels where M is greater than N, the method comprising the steps of:
Dependencies are inferred from the claim text.