An interactive dynamic range adjustment system for printing digital images

Claim 2

An interactive dynamic range adjustment method for digital images comprising the steps of: (a) converting a digital image into luminance image signals and chrominance image signals; (b) separating the low frequency components from the luminance image signals; (c) modifying, interactively, the separated low frequency components of the luminance image signals by a mapping curve to a density space; (d) recombining the modified separated low frequency components to the luminance signals of step (b); and (e) converting and combining the resultant luminance signals of step (d) with the chrominance image signals of step (a) to provide an interactively adjusted digital image.

Claim 3

The interactive dynamic range adjustment method for digital images according to claim 1 and further comprising the steps of; displaying the original digital image; displaying the interactively adjusted digital image signal; and displaying the mapping curve of step (c).

Claim 4

The interactive dynamic range adjustment method for digital images according to claim 2 wherein the displayed mapping curve is a piecewise linear curve having three segments, a lower slope, mid-slope and upper slope with the ends of the mid-slope segment having one end connected to an end of the lower slope segment and its other end connected to an end of the upper slope segment.

Claim 5

The interactive dynamic range adjustment method for digital images according to claim 2 and further comprising the steps of: displaying a density histogram of the original image; and displaying interactive values for operator modifications.

Claim 6

The interactive dynamic range adjustment method for digital images according to claim 2 and further comprising the steps of: modifying the interactive adjusted digital image by a display device curve to display the interactive adjusted digital image as it will be printed on paper.

Claim 7

The interactive dynamic range adjustment method for digital images according to claim 1 and further comprising the steps of: modifying the provided interactively adjusted digital image of step (e) by mapping the adjusted digital image through a paper shape curve.

Claim 8

The interactive dynamic range adjustment method for digital images according to claim 1 wherein step (c) modifies the separated low frequency components by contrast adjustment and density balance.

Claim 9

An interactive dynamic range adjustment method for a digital image comprising the steps of: (a) converting R,G,B digital image signals into luminance image signals and chrominance image signals; (b) low-pass filtering the luminance image signals to provide low frequency component luminance image signals; (c) subtracting the low frequency component luminance image signals from the luminance image signals to provide high frequency component luminance image signals; (d) modifying, interactively, the low frequency components of the luminance image signals by mapping through a mapping curve to a density space; (e) modifying the high frequency component luminance image signals by a desired mapping; (f) recombining the modified low frequency and high frequency components of the luminance image signals of steps (d) and (e); and (g) converting the recombined luminance image signals of step (f) and the chrominance image signals of step (a) to R,G,B signals to provide an interactively adjusted digital image.

Claim 10

An interactive dynamic range adjustment method for a digital image comprising the steps of: (a) converting R,G,B digital image signals into luminance image signals and chrominance image signals; (b) low-pass filtering the luminance image signals to provide low frequency component luminance image signals; (c) subtracting the low frequency component luminance image signals from the luminance image signals to provide high frequency component luminance image signals; (d) modifying, interactively, the low frequency components of the luminance image signals by mapping through a mapping curve to a density space; (e) modifying the high frequency component luminance image signals by a desired mapping; (f) recombining the modified low frequency and high frequency components of the luminance image signals of steps (d) and (e); and (g) converting the recombined luminance image signals of step (f) and the chrominance image signals of step (a) to R,G,B signals to provide an interactively adjusted digital image.

Claim 11

The interactive dynamic range adjustment method for digital images according to claim 8 and further comprising the step of: modifying the provided interactively adjusted digital image of step (g) by mapping the adjusted digital image through a paper shape curve.

Claim 12

the interactive dynamic range adjustment method for digital images according to claim 8 wherein step (d) modifies the separated low frequency components by contrast adjustment and density balance.

Claim 13

The interactive dynamic range adjustment method for digital images according to claim 8 and further comprising: displaying the original digital image; displaying the interactively adjusted digital image signal; and displaying the mapping curve of step (d).

Claim 14

The interactive dynamic range adjustment method for digital images according to claim 8 wherein the displayed mapping curve is a piecewise linear curve having three segments, a lower slope, mid-slope and upper slope with the ends of the mid-slope segment having one end connected to an end of the lower slope segment and its other end connected to an end of the upper slope segment.

Claim 15

An interactive dynamic range adjustment method for digital images comprising the steps of: (a) converting an R,G,B digital image signal into luminance signals and chrominance image signals; (b) low-pass filtering the luminance image signals to provide low frequency component luminance image signals; (c) subtracting the low frequency component luminance image signals from the luminance image signals to provide high frequency component luminance image signals; (d) modifying, interactively, the low frequency components of the luminance image signals by mapping through a mapping curve to a density space; (e) recombining the modified low frequency and high frequency components of the luminance image signals of steps (c) and (d); and (f) converting the recombined luminance image signal of step (e) with the chrominance image signals of step (a) to provide an interactively adjusted R,G,B digital image.

Claim 16

An interactive dynamic range adjustment method for digital images comprising the steps of: (a) converting an R,G,B digital image signal into luminance signals and chrominance image signals; (b) low-pass filtering the luminance image signals to provide low frequency component luminance image signals; (c) subtracting the low frequency component luminance image signals from the luminance image signals to provide high frequency component luminance image signals; (d) modifying, interactively, the low frequency components of the luminance image signals by mapping through a mapping curve to a density space; (e) recombining the modified low frequency and high frequency components of the luminance image signals of steps (c) and (d); and (f) converting the recombined luminance image signal of step (e) with the chrominance image signals of step (a) to provide an interactively adjusted R,G,B digital image.

Claim 17

The interactive dynamic range adjustment method for digital images according to claim 13 and further comprising the steps of: modifying the provided interactively adjusted R,G,B digital image of step (f) by mapping the adjusted R,G,B digital image through a paper shape curve.

Claim 18

The interactive dynamic range adjustment method for digital images according to claim 13 wherein step (d) modifies the separated low frequency components by contrast adjustment and density balance.

Claim 19

The interactive dynamic range adjustment method for digital images according to claim 13 and further comprising: displaying the original digital image; displaying the digital image corresponding to the interactively adjusted R,G,B digital image; and displaying the mapping curve of step (d).

Claim 20

The interactive dynamic range adjustment method for digital images according to claim 16 wherein the displayed mapping curve is a piecewise linear curve having three segments, a lower slope, mid-slope and upper slope with the ends of the mid-slope segment having one end connected to an end of the lower slope segment and its other end connected to an end of the upper slope segment.

Claim 21

The interactive dynamic range adjustment method for digital images according to claim 13 and further comprising the steps of: displaying the density histogram of the original digital image; and displaying interactive values for operator modification.

Claim 22

The interactive dynamic range adjustment method for digital images according to claim 13 and further comprising the step of modifying the interactive by adjusted digital R,G,B image by a display device curve to display the interactively adjusted digital image as it will be printed on paper.

Claim 23

An interactive dynamic range adjustment method for digital images comprising the steps of: (a) converting an R,G,B digital image signal into luminance image signals; (b) low-pass filtering the luminance image signals to provide low frequency component luminance image signals; (c) subtracting the low frequency component luminance image signals from the luminance image signals to provide high frequency component luminance image signals; (d) modifying, interactively, the low frequency components of the luminance image signals by mapping through a mapping curve to a density space; (e) recombining the modified low frequency and high frequency components of the luminance image signals of steps (c) and (d); (f) mapping the recombined modified low and high frequency components of the luminance image signals of (e) through a paper shape curve; (g) mapping an R,G,B digital image signals of step (a) through a paper shape curve; (h) transforming the mapped R,G,B signals of step (g) into chrominance image signals; (i) combining the luminance image signals of step (f) and the chrominance image signals of step (h); and (j) transforming the combined signals from (i) to R,G,B image signals to provide an interactively adjusted digital image.

Claim 24

An interactive dynamic range adjustment method for digital images comprising the steps of: (a) converting an R,G,B digital image signal into luminance image signals; (b) low-pass filtering the luminance image signals to provide low frequency component luminance image signals; (c) subtracting the low frequency component luminance image signals from the luminance image signals to provide high frequency component luminance image signals; (d) modifying, interactively, the low frequency components of the luminance image signals by mapping through a mapping curve to a density space; (e) recombining the modified low frequency and high frequency components of the luminance image signals of steps (c) and (d); (f) mapping the recombined modified low and high frequency components of the luminance image signals of (e) through a paper shape curve; (g) mapping an R,G,B digital image signals of step (a) through a paper shape curve; (h) transforming the mapped R,G,B signals of step (g) into chrominance image signals; (i) combining the luminance image signals of step (f) and the chrominance image signals of step (h); and (j) transforming the combined signals from (i) to R,G,B image signals to provide an interactively adjusted digital image.

Claim 25

The interactive dynamic range adjustment method for digital images according to claim 20 wherein step (d) modifies the separated low frequency components by contrast adjustment and density balance.

Claim 26

the interactive dynamic range adjustment method for digital images according to claim 20 and further comprising: displaying the original digital image; displaying the digital image corresponding to the interactively adjusted digital image signal; and displaying the mapping curve of step (d).

Claim 27

The interactive dynamic range adjustment method for digital images according to claim 22 wherein the displayed mapping curve is a piecewise linear curve having three segments, a lower slope, mid-slope and upper slope with the ends of the mid-slope segment having one end connected to an end of the lower slope segment and its other end connected to an end of the upper slope segment.

Claim 28

The interactive dynamic range adjustment method for digital images according to claim 20 and further comprising the steps of: displaying the density histogram of the original digital image; and displaying interactive values for operator modification.

Claim 29

The interactive dynamic range adjustment method for digital images according to claim 20 and further comprising the step of modifying the interactive adjusted digital image by a display device curve to display the interactive adjusted digital image as it will be printed on paper.

Claim 30

An interactive dynamic range adjustment system for digital images comprising: (a) transformation means (100) for converting a digital image into luminance image signals and chrominance image signals; (b) filtering means (120) connected to said transformation means for separating the low frequency components from said luminance image signals; (c) dynamic range means (140) for modifying, interactively, the separated low frequency components of said luminance image signals by a mapping curve to a density space; (d) means (110, 130, 150) for recombining the modified separated low frequency components with said luminance image signals; and (e) means (160) for combining and converting the signals from said recombining means with the chrominance image signals from said transformation means (100) to provide an interactively adjusted digital image.

Claim 31

An interactive dynamic range adjustment system for digital images comprising: (a) transformation means (100) for converting a digital image into luminance image signals and chrominance image signals; (b) filtering means (120) connected to said transformation means for separating the low frequency components from said luminance image signals; (c) dynamic range means (140) for modifying, interactively, the separated low frequency components of said luminance image signals by a mapping curve to a density space; (d) means (110, 130, 150) for recombining the modified separated low frequency components with said luminance image signals; and (e) means (160) for combining and converting the signals from said recombining means with the chrominance image signals from said transformation means (100) to provide an interactively adjusted digital image.

Claim 32

The interactive dynamic range adjustment system for digital images according to claim 26 and further comprising: paper curve means (170) for modifying the provided interactively adjusted digital image to adjust for print paper responses.

Claim 33

The interactive dynamic range adjustment system for digital images according to claim 26 wherein said dynamic range means (140) is a programmable look-up table (200).

Claim 34

An interactive dynamic range adjustment system for digital images characterized by: (a) first transformation means (100) for transforming digital R,G,B image signals into luminance image signals and chrominance image signals; (b) low-pass filtering means (120) for receiving the luminance image signals from said transformation means (100) to provide low frequency component luminance image signals; (c) first summing means (110) for subtracting the low frequency component luminance image signals from the luminance image signals to provide high frequency component luminance image signals; (d) dynamic range adjustment means (140) for modifying, interactively, the low frequency components of the luminance image signals from said first transformation means by mapping to a density space; (e) means (130) for edge sharpening and noise suppressing the high frequency component luminance image signals from said first transformation means; (f) second summing means (150) for recombining the modified low frequency and high frequency components of the luminance image signals; and (g) second transformation means (160) for receiving the recombined signals from said second summing means (150) and the chrominance signals from said first transformation means (100) to provide an interactively adjusted digital R,G,B image.

Claim 35

An interactive dynamic range adjustment system for digital images characterized by: (a) first transformation means (100) for transforming digital R,G,B image signals into luminance image signals and chrominance image signals; (b) low-pass filtering means (120) for receiving the luminance image signals from said transformation means (100) to provide low frequency component luminance image signals; (c) first summing means (110) for subtracting the low frequency component luminance image signals from the luminance image signals to provide high frequency component luminance image signals; (d) dynamic range adjustment means (140) for modifying, interactively, the low frequency components of the luminance image signals from said first transformation means by mapping to a density space; (e) means (130) for edge sharpening and noise suppressing the high frequency component luminance image signals from said first transformation means; (f) second summing means (150) for recombining the modified low frequency and high frequency components of the luminance image signals; and (g) second transformation means (160) for receiving the recombined signals from said second summing means (150) and the chrominance signals from said first transformation means (100) to provide an interactively adjusted digital R,G,B image.

Claim 36

The interactive dynamic range adjustment system for digital images according to claim 29 and further comprising: paper curve means (170) for modifying the provided interactively adjusted digital R,G,B image by mapping the adjusted digital R,G,B images through a paper shape curve.

Claim 37

An interactive dynamic range adjustment system for digital images characterized by: (a) first transformation means (300) for transforming digital R,G,B image signals into luminance image signals and chrominance image signals; (b) low-pass filtering means (320) for receiving the luminance image signals from said transformation means (300) to provide low frequency component luminance image signals; (c) first summing means (310) for subtracting the low frequency component luminance image signals from the luminance image signals to provide high frequency component luminance image signals; (d) dynamic range adjustment means (340) for modifying, interactively, the low frequency components of the luminance image signals from said first transformation means by mapping to a density space; (e) means (330) for edge sharpening and noise suppressing the high frequency component luminance image signals from said first transformation means; (f) second summing means (350) for recombining the modified low frequency and high frequency components of the luminance image signals; (g) paper curve means (370) for modifying digital R,G,B image signals by mapping the digital R,G,B image signals through a paper shape curve; (h) a second transformation means (380) for transforming the mapped digital R,G,B image signals from said paper curve means (370) into chrominance image signals; (i) a luminance paper shape curve means (360) for modifying the provided summed signal from said second summing means (350) by mapping the provided summed signal through a paper shape curve; and (j) third transformation means (390) for receiving the chrominance signals from said second transformation means (380) and the mapped signals from said luminance paper shape curve means (360) to provide an interactively adjusted digital R,G,B image.

Claim 38

An interactive dynamic range adjustment system for digital images characterized by: (a) first transformation means (300) for transforming digital R,G,B image signals into luminance image signals and chrominance image signals; (b) low-pass filtering means (320) for receiving the luminance image signals from said transformation means (300) to provide low frequency component luminance image signals; (c) first summing means (310) for subtracting the low frequency component luminance image signals from the luminance image signals to provide high frequency component luminance image signals; (d) dynamic range adjustment means (340) for modifying, interactively, the low frequency components of the luminance image signals from said first transformation means by mapping to a density space; (e) means (330) for edge sharpening and noise suppressing the high frequency component luminance image signals from said first transformation means; (f) second summing means (350) for recombining the modified low frequency and high frequency components of the luminance image signals; (g) paper curve means (370) for modifying digital R,G,B image signals by mapping the digital R,G,B image signals through a paper shape curve; (h) a second transformation means (380) for transforming the mapped digital R,G,B image signals from said paper curve means (370) into chrominance image signals; (i) a luminance paper shape curve means (360) for modifying the provided summed signal from said second summing means (350) by mapping the provided summed signal through a paper shape curve; and (j) third transformation means (390) for receiving the chrominance signals from said second transformation means (380) and the mapped signals from said luminance paper shape curve means (360) to provide an interactively adjusted digital R,G,B image.