Method of down-sampling data values
First Claim
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1. A method of down-sampling data values, said method comprising:
- determining a first set of data values comprising a central data value and peripheral values of original data spatially surrounding said central data value;
comparing differences between the central data value and said peripheral values to a threshold;
replacing a peripheral value corresponding to a difference that exceeds the threshold with a clipped value based upon the central data value, thereby producing a second set of data values but leaving the peripheral value unchanged when the difference is lower than the threshold; and
low pass filtering the second set of data values.
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Abstract
The present invention relates to a method of down-sampling data values. A first set of data values comprise a central data value and peripheral values of original data spatially surrounding the central data value. The central and peripheral values are compared to determine whether any differences exceed a threshold. Whenever a difference does exceed a threshold, a clipped value based upon the central data value replaces the corresponding peripheral value, thereby producing a second set of data values.
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Citations
10 Claims
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1. A method of down-sampling data values, said method comprising:
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determining a first set of data values comprising a central data value and peripheral values of original data spatially surrounding said central data value; comparing differences between the central data value and said peripheral values to a threshold; replacing a peripheral value corresponding to a difference that exceeds the threshold with a clipped value based upon the central data value, thereby producing a second set of data values but leaving the peripheral value unchanged when the difference is lower than the threshold; and low pass filtering the second set of data values. - View Dependent Claims (2)
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3. A device for down-sampling data values, said device comprising:
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means for determining a first set of data values comprising a central data value and peripheral values of original data surrounding said central data value; means for determining whether differences between the central data value and said peripheral values exceed a threshold; means for replacing a peripheral value corresponding to a difference that exceeds the threshold with a clipped value based upon the central data value, thereby producing a second set of data values but leaving the peripheral value unchanged when the difference is lower than the threshold, thereby producing a second set of data values; and means for low pass filtering the second set of data values. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10)
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Specification