US5790707A — Film image reading system and image processing me…

Claim 1

Independent Claim 184 words

A gamma corrector for correcting R, G, B digital signals of a film image which are input sequentially comprising: a reading system reading the film image and outputting R, G, B, digital signals; a look-up table in which a base gamma correction value according to a signal level is stored previously; a gamma gain setter setting gamma gain of each color for extending or compressing said base gamma correction value; a reader reading said base gamma correction value sequentially from said look-up table based on said R, G, B digital signals which are input sequentially; a selector selecting a gamma gain among gamma gains of respective colors in accordance with a color digital signal corresponding to said base gamma correction value output by said reader; a multiplier multiplying said base gamma correction value output from said reader and said gamma gain output by said selector to output a real gamma correction value; and a subtractor subtracting said real gamma correction value output by said multiplier from said R, G, B digital signals which are input sequentially, thereby providing gamma correction dot-sequentially for each color.

Claim 2

Dependent Claim 184 words

A gamma corrector for correcting R, G, B digital signals of a film image which are input sequentially comprising: a reading system reading the film image and outputting R, G, B, digital signals; a look-up table in which a base gamma correction value according to a signal level is stored previously; a gamma gain setter setting gamma gain of each color for extending or compressing said base gamma correction value; a reader reading said base gamma correction value sequentially from said look-up table based on said R, G, B digital signals which are input sequentially; a selector selecting a gamma gain among gamma gains of respective colors in accordance with a color digital signal corresponding to said base gamma correction value output by said reader; a multiplier multiplying said base gamma correction value output from said reader and said gamma gain output by said selector to output a real gamma correction value; and a subtractor subtracting said real gamma correction value output by said multiplier from said R, G, B digital signals which are input sequentially, thereby providing gamma correction dot-sequentially for each color.

Claim 3

Dependent Claim 31 words

The gamma corrector according to claim 1, wherein said gamma gain setter includes means for varying the gamma gain of each color in accordance with a brightness of the film image.

Claim 4

Dependent Claim 190 words

An image processing method in which a film, which is developed, for still photography is fed at a constant speed, an image of said film is read by a line sensor, an output voltage of said line sensor is converted into dot-sequential R, G, B digital signals by a A/D convertor, and then said R, G, B digital signals are digital-processed, said image processing method comprising; (a) step of detecting reference maximum values and reference minimum values of said R, G, B digital signals, respectively, while scanning one film image of said film and of calculating offset values and gain volumes of R, G, B respectively base on said reference maximum values and said reference minimum values; (b) step of adding dot-sequential R, G, B digital signals outputted from said A/D convertor during re-scanning of said one film image to said offset values, which are calculated, of R, G, B; and, (c) step of multiplying said dot-sequential R, G, B digital signals which are offset by said gain volumes of R, G, B, respectively; wherein these steps are performed so as to adjust a white balance and a black balance.

Claim 5

Dependent Claim 190 words

An image processing method in which a film, which is developed, for still photography is fed at a constant speed, an image of said film is read by a line sensor, an output voltage of said line sensor is converted into dot-sequential R, G, B digital signals by a A/D convertor, and then said R, G, B digital signals are digital-processed, said image processing method comprising; (a) step of detecting reference maximum values and reference minimum values of said R, G, B digital signals, respectively, while scanning one film image of said film and of calculating offset values and gain volumes of R, G, B respectively base on said reference maximum values and said reference minimum values; (b) step of adding dot-sequential R, G, B digital signals outputted from said A/D convertor during re-scanning of said one film image to said offset values, which are calculated, of R, G, B; and, (c) step of multiplying said dot-sequential R, G, B digital signals which are offset by said gain volumes of R, G, B, respectively; wherein these steps are performed so as to adjust a white balance and a black balance.

Claim 6

Dependent Claim 46 words

An image processing method as set forth in claim 3, further comprising a step of negative-positive reversal by subtracting said dot-sequential R, G. B digital signals, which are offset, from a determined value showing a white peak level between said (a) step and said (b) step.

Claim 7

Dependent Claim 49 words

An image processing method as set forth in claim 3, wherein said reference maximum values and said reference minimum values in said (a) step are calculated among m×n integrated values obtained from a integrating block for integrating each picture element group which one image plane is divided into m×n.

Claim 8

Dependent Claim 170 words

An image processing method as set forth in claim 3, wherein a look-up table which previously stores a gamma correction value according to a signal level is arranged and gamma gains for extending or compressing said gamma correction value by multiplying said gamma correction value are set for respective colors, and after said (c) step, (d) step of reading sequentially a gamma correction value from said look-up table based on R, G, B digital signals which are inputted sequentially and of selecting a gamma gain among gamma gains of said respective colors in accordance with that said gamma correction value which is read corresponds to what color digital signal; and, (e) step of applying a multiplication of said gamma correction value which is read and said gamma gain which is selected and of subtracting a gamma correction value which is extended or compressed by said multiplication from said R, G, B digital signals which are inputted sequentially; are performed so that a gamma correction is achieved dot-sequentially by each color.

Claim 9

Dependent Claim 27 words

An image processing method as set forth in claim 6, wherein said gamma gain of each color is determined based on a brightness of said film image.

Claim 10

Independent Claim 165 words

A method for gamma correcting R, G, B digital signals of a film image which are input sequentially comprising: reading the film image and outputting sequential R, G, B, digital signals therefrom; providing a look-up table in which a base gamma correction value according to a signal level is stored previously; setting gamma gain of each color for extending or compressing said base gamma correction value; reading said base gamma correction value sequentially from said look-up table based on said sequential R, G, B digital signals; selecting a gamma gain among gamma gains of respective colors in accordance with a color digital signal corresponding to said gamma correction value which is read; multiplying said base gamma correction value which is read and said gamma gain which is selected to form a real gamma correction value; and subtracting said real gamma correction value formed by said multiplying from said sequential R, G, B digital signals so that a gamma correction is achieved dot-sequentially by each color.

Claim 11

Independent Claim 165 words

A method for gamma correcting R, G, B digital signals of a film image which are input sequentially comprising: reading the film image and outputting sequential R, G, B, digital signals therefrom; providing a look-up table in which a base gamma correction value according to a signal level is stored previously; setting gamma gain of each color for extending or compressing said base gamma correction value; reading said base gamma correction value sequentially from said look-up table based on said sequential R, G, B digital signals; selecting a gamma gain among gamma gains of respective colors in accordance with a color digital signal corresponding to said gamma correction value which is read; multiplying said base gamma correction value which is read and said gamma gain which is selected to form a real gamma correction value; and subtracting said real gamma correction value formed by said multiplying from said sequential R, G, B digital signals so that a gamma correction is achieved dot-sequentially by each color.

Claim 12

Dependent Claim 29 words

An image processing method as set forth in claim 8, wherein said setting includes varying said gamma gain of each color based on a brightness of said film image.

Claim 13

Dependent Claim 166 words

An image processor for developed film for still photography comprising: means for feeding developed film; a line sensor reading an image of said film; an A/D convertor converting an output voltage from said line sensor into dot-sequential R, G, B digital signals; a detector detecting reference maximum values and reference minimum values of said R, G, B digital signals, respectively, while scanning one film image of said film; a calculator calculating offset values and gain volumes of R, G, B respectively based on said reference maximum values and said reference minimum values; an adder adding dot-sequential R, G, B digital signals output from said A/D convertor during re-scanning of said one film image to said offset values, which are calculated, of R, B, G; and a multiplier multiplying said dot-sequential R, G, B digital signals output from said adder by said gain volumes of R, G, B, respectively, wherein said detector, said calculator, said adder and said multiplier adjust a white balance and a black balance.

Claim 14

Dependent Claim 166 words

An image processor for developed film for still photography comprising: means for feeding developed film; a line sensor reading an image of said film; an A/D convertor converting an output voltage from said line sensor into dot-sequential R, G, B digital signals; a detector detecting reference maximum values and reference minimum values of said R, G, B digital signals, respectively, while scanning one film image of said film; a calculator calculating offset values and gain volumes of R, G, B respectively based on said reference maximum values and said reference minimum values; an adder adding dot-sequential R, G, B digital signals output from said A/D convertor during re-scanning of said one film image to said offset values, which are calculated, of R, B, G; and a multiplier multiplying said dot-sequential R, G, B digital signals output from said adder by said gain volumes of R, G, B, respectively, wherein said detector, said calculator, said adder and said multiplier adjust a white balance and a black balance.

Claim 15

Dependent Claim 41 words

The image processor as set forth in claim 10, wherein said adder further includes a subtractor subtracting said dot-sequential R, G, B, digital signals which have been added to said offset values from a determined valued indicating a white peak level.

Claim 16

Dependent Claim 162 words

The image processor as set forth in claim 10, further comprising: a look-up table in which a base gamma correction value according to a signal level is stored previously; a gamma gain setter setting gamma gain of each color for extending or compressing said base gamma correction value; a reader reading said base gamma correction value sequentially from said look-up table based on said R, G, B digital signals which are input sequentially; a selector selecting a gamma gain among gamma gains of respective colors in accordance with a color digital signal corresponding to said base gamma correction value output by said reader; a multiplier multiplying said base gamma correction value output from said reader and said gamma gain output by said selector to output a real gamma correction value; and a subtractor subtracting said real gamma correction value output by said multiplier from said R, G, B digital signals which are input sequentially, thereby providing gamma correction dot-sequentially for each color.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	2001-08-03	2002-02-02	2002-08-04	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2005-08-03	2006-02-02	2006-08-04	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2009-08-03	2010-02-02	2010-08-04	$7700.00	Window Closed / Lapsed

Film image reading system and image processing method dot sequentially adjusting image parameters

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