Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
139 words
A system for correcting non-uniformities in the output of a photosensor system comprising: an array of photosensitive elements for reading a pattern image on a document and for producing a series of output signals corresponding to said image; a storage means, coupled to said array and having a number of memory cells each corresponding to a respective photosensitive element, for storing data representing the non-uniformity characteristics of the photosensor system; a comparing means for successively comparing the signal from each element with the data stored in a corresponding memory cell and updating the data stored in said storage means in accordance with the results of said comparison; and correcting means, coupled to the storage means and said photosensor array, for correcting the output signals of said photoelements by producing sensor output response signals that are compensated for said non-uniformities.
Claim 2
Independent Claim
139 words
A system for correcting non-uniformities in the output of a photosensor system comprising: an array of photosensitive elements for reading a pattern image on a document and for producing a series of output signals corresponding to said image; a storage means, coupled to said array and having a number of memory cells each corresponding to a respective photosensitive element, for storing data representing the non-uniformity characteristics of the photosensor system; a comparing means for successively comparing the signal from each element with the data stored in a corresponding memory cell and updating the data stored in said storage means in accordance with the results of said comparison; and correcting means, coupled to the storage means and said photosensor array, for correcting the output signals of said photoelements by producing sensor output response signals that are compensated for said non-uniformities.
Claim 3
Dependent Claim
44 words
The system of claim 1 wherein said comparing means determines the larger data value between said stored data and the signal from the sensor element, said comparing means further comprising a rewriting means for rewriting said larger data value in said corresponding memory cell.
Claim 4
Dependent Claim
52 words
The system of claim 1 wherein said correcting means comprises: memory converting means for converting the updated stored data in accordance with a weighting factor and producing a converted output signal; and multiplier means for multiplying said converted output signal and said photoelement output signals and producing said sensor output response signals.
Claim 5
Dependent Claim
36 words
The system of claim 1 further comprising: a converting means coupled to said photosensitive elements for converting the output signals of the elements to digital data signals and supplying said digital signals to said comparing means.
Claim 6
Dependent Claim
39 words
The system of claim 3 wherein said memory converting means converts the updated stored data in accordance with the factor y=a/x, where x is the updated data value, a is a constant and y is the converted output signal.
Claim 7
Dependent Claim
21 words
The system of claim 1 wherein the storage means includes means for clearing the memory upon turning on the power source.
Claim 8
Dependent Claim
21 words
The system of claim 1 wherein the photosensitive array detects the light reflected from a white surface before reading the document.