Image compensating method
First Claim
1. An image compensating method, comprising:
- using a plurality of scanning lines to scan a document and a longitudinal black and white pattern, in order to produce a plurality of actual gray level values for a plurality of pixels with respect to each of the scanning lines and the document, as well as a correctional gray level value for complete black and a correctional gray level value for complete white with respect to the longitudinal black and white pattern; and
obtaining a compensational gray level value with respect to the actual gray level value for each of the pixels according to the correctional gray level value for complete black, the correctional gray level value for complete white, a theoretical gray level value for complete black, a theoretical gray level value for complete white, and the actual gray level value for each of the pixels.
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Abstract
An image compensating method. First, multiple scanning lines are used to scan a document and a longitudinal black and white pattern, in order to produce the actual gray level value for multiple pixels with respect to each of the scanning lines and the document, as well as a correctional gray level value for complete black and a correctional gray level value for complete white with respect to the longitudinal black and white pattern. Then, the compensational gray level value with respect to the actual gray level value for each of the pixels is obtained according to the correctional gray level value for complete black, the correctional gray level value for complete white, the theoretical gray level value for complete black, the theoretical gray level value for complete white, and the actual gray level value for each of the pixels. Then, the procedure is complete.
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Citations
9 Claims
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1. An image compensating method, comprising:
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using a plurality of scanning lines to scan a document and a longitudinal black and white pattern, in order to produce a plurality of actual gray level values for a plurality of pixels with respect to each of the scanning lines and the document, as well as a correctional gray level value for complete black and a correctional gray level value for complete white with respect to the longitudinal black and white pattern; and
obtaining a compensational gray level value with respect to the actual gray level value for each of the pixels according to the correctional gray level value for complete black, the correctional gray level value for complete white, a theoretical gray level value for complete black, a theoretical gray level value for complete white, and the actual gray level value for each of the pixels. - View Dependent Claims (2, 3)
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4. An image compensating method, comprising:
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using a plurality of scanning lines to scan a document and a longitudinal complete white pattern, in order to produce a plurality of actual gray level values for a plurality of pixels with respect to each of the scanning lines and the document, as well as a correctional gray level value for complete white with respect to the longitudinal white pattern; and
obtaining a compensational gray level value with respect to the actual gray level value for each of the pixels according to the correctional gray level value for complete white, a theoretical gray level value for complete white, and the actual gray level value for each of the pixels. - View Dependent Claims (5, 6)
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7. An image compensating method, comprising:
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using a plurality of scanning lines to scan a document and a longitudinal complete black pattern, in order to produce a plurality of actual gray level values for a plurality of pixels with respect to each of the scanning lines and the document, as well as a correctional gray level value for complete black with respect to the longitudinal black pattern; and
obtaining a compensational gray level value with respect to the actual gray level value for each of the pixels according to the correctional gray level values for complete black, a theoretical gray level value for complete black, and the actual gray level value for each of the pixels. - View Dependent Claims (8, 9)
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Specification