Output correcting system for facsimile

Claim 2

An optical image reading apparatus comprising: a solid state image sensor for scanning a plurality of data blocks arranged in slices; means for generating video signals corresponding to an image to be read by said solid state image sensor; means for determining respective mean values of the video signals corresponding to each of said data blocks; means for storing the mean values in a memory as digital information; means for reading the stored mean values out of said memory and converting the digital information to analog information; and means for determining a corrected slice signal level in each of said blocks from said analog information.

Claim 3

An optical image reading apparatus comprising: a solid state image sensor for scanning a plurality of data blocks arranged in slices; means for generating video signals corresponding to an image to be read by said solid state image sensor; means for generating a peak signal corresponding to the overall brightness of said image; means for determining respective mean values of the video signals corresponding to each of said data blocks; means for correcting the respective mean values using the peak signal and producing an output signal indicative ot this corrected mean value; means for generating a slice level determining signal through the use of the output of the correcting means to provide a corrected slice signal level; means for comparing the video signals with the corrected mean value derived from the corrected mean value derived from the corrected means to produce a bi-valued signal; and means for developing a corrected video signal by using the slice level determining signal.

Claim 4

An optical image reading apparatus comprising: a solid state image sensor for scanning a plurality of data blocks arranged in slices; means for generating video signals corresponding to an image to be read by said solid state image sensor; means for generating a peak signal corresponding to the overall brightness of said image; means for determining respective mean values of the video signals corresponding to each of said data blocks; means for correcting the respective mean values using the peak signal and producing an output signal indicative ot this corrected mean value; means for generating a slice level determining signal through the use of the output of the correcting means to provide a corrected slice signal level; means for comparing the video signals with the corrected mean value derived from the corrected mean value derived from the corrected means to produce a bi-valued signal; and means for developing a corrected video signal by using the slice level determining signal.

Claim 5

The apparatus of claim 2 wherein said slice level determining signal corrects for non-uniformities in the background intensity of said video signal.

Claim 6

An optical image reading apparatus for reading images, said apparatus comprising: a solid state image sensor scanning a plurality of data blocks, said data blocks dividing said data into an M×N array, said sensor scanning individual N bits of the M slices successively to scan the entire data; means for generating video signals corresponding to an image to be read by said solid state image sensor; means for determining respective mean values of the video signals corresponding to each of said data bits; means for storing the mean values in a memory as digital information; means for reading the stored mean values out of memory and converting the digital information to analog information; and means for determining a corrected slice signal level in each of said blocks from said analog information.

Claim 7

An optical image reading apparatus for reading images, said apparatus comprising: a solid state image sensor scanning a plurality of data blocks, said data blocks dividing said data into an M×N array, said sensor scanning individual N bits of the M slices successively to scan the entire data; means for generating video signals corresponding to an image to be read by said solid state image sensor; means for determining respective mean values of the video signals corresponding to each of said data bits; means for storing the mean values in a memory as digital information; means for reading the stored mean values out of memory and converting the digital information to analog information; and means for determining a corrected slice signal level in each of said blocks from said analog information.

Claim 8

An optical image reading apparatus for reading images, said apparatus comprising: a solid state image sensor scanning a plurality of data blocks; means for generating video signals corresponding to the data to be read by said solid state image sensor; means for determining respective mean values of the video signals corresponding to each of said data blocks; a power supply; means responsive to the energization of said power supply for storing the mean values in a memory as information; and means for reading the stored mean values out of memory and for using these values to correct the signal level of said video signals corresponding to said data.

Claim 9

An optical image reading apparatus for reading images, said apparatus comprising: a solid state image sensor scanning a plurality of data blocks; means for generating video signals corresponding to the data to be read by said solid state image sensor; means for determining respective mean values of the video signals corresponding to each of said data blocks; a power supply; means responsive to the energization of said power supply for storing the mean values in a memory as information; and means for reading the stored mean values out of memory and for using these values to correct the signal level of said video signals corresponding to said data.