Image correction method, apparatus, article and image
OwnerTom-Chin Changinventor
Life of this patent
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Abstract
An image correction method able to avoid error image. According to opposite properties of black and white, only the last few bits of the scanned digital signal are extracted for black correction, while only the first few bits of the scanned digital signal are extracted for white correction. Further, the most significant bit of the digital signal is 1 for white correction. Therefore, the unwanted LBB effect on the scanned image caused by dust or spot on the correction document is avoided. In addition, as only a few bits of the scanned digital signal are extracted, the requirement in memory capacity is reduced.
Claims20
An apparatus, comprising:
- means for obtaining a white correction digital signal by scanning a document during white correction;
- means for extracting only a plurality of first bits of the white correction digital signal;
- and
- means for setting the most significant bit of the white correction digital signal to a value of one.
An apparatus, comprising:
- circuitry configured to:
- obtain a white correction digital signal by scanning a white correction document during white correction;
- extract only a plurality of first bits of the white correction digital signal;
- and
- set the most significant bit of the white correction digital signal to a value of one.
A method, comprising:
- scanning a target object during white correction to obtain a white correction digital signal;
- extracting only a plurality of first bits of the white correction digital signal;
- and
- setting the most significant bit of the white correction digital signal to a value of one.
An apparatus, comprising:
- circuitry configured to:
- obtain a digital signal by scanning a scan object;
- if the digital signal is obtained during a first mode, extract only a plurality of last bits of the digital signal;
- store only the extracted ones of the bits in a memory thereby minimizing a memory requirement for storing a representation of the scan object;
- if the digital signal is obtained during a second mode, extract only a plurality of first bits of the digital signal;
- and
- set a most significant one of the extracted first bits to a value of one.
A method, comprising:
- scanning a target object to obtain a digital signal;
- if the digital signal is to represent black, extracting only a plurality of last bits of the digital signal;
- storing only the extracted ones of the last bits in a memory thereby minimizing a memory requirement for storing a representation of the target object;
- if the digital signal is to represent white, extracting only a plurality of first bits of the digital signal;
- and
- setting a most significant one of the extracted first bits to a value of one.
Dependencies are inferred from the claim text.