Method and system to correct color errors in color television signals generated by scanning a film

Claim 2

A Color Correction System for a television film scanner which includes an opto-electronic scanning device and a digital store comprising, first signal correction means being connected between said scanning device and said digital store, second signal correction means being connected to the output of the digital store.

Claim 3

A System according to claim 1, comprising light control means being arranged between the film and the scanning device.

Claim 4

A System according to claim 1 wherein said first and second signal correction means comprise black and white level control, gamma control for each individual color signal (red, green, and blue), and master control for black, gain, and gamma, and linear and/or non-linear matrix means.

Claim 5

A System according to claim 3, wherein first signal correction means comprise black and white level control for each individual color signal.

Claim 7

A System according to claim 1, wherein the output signals of the opto-electronic scanning device are supplied to the digital store with a master gamma of about 1 and wherein said signals are analogue-to-digital converted using at least a 11 bits linear quantization response.

Claim 8

A System according to claim 1, wherein the output signals of said scanning device are supplied to the digital store after a non-linear pre-distortion and an 8 bit quantization.

Claim 9

A system according to claim 7, wherein after said digital store distortion means are arranged with an inverse function compared with said pre-distortion means.

Claim 10

A System according to claim 7, wherein said pre-distortion means have an amplitude distortion function according to the standard television gamma.

Claim 11

A System according to claim 1 comprising 8- bit quantizing means, non-linear pre-distortion means, and first signal control means being arranged before said digital store; and being arranged after the digital store the second correction means comprise in a signal path for luminance signals luminance control means and in a signal path for chrominance signals chrominance control. means, wherein said luminance control means are provided for individually controlling white, black, and gamma balance.

Claim 12

A System according to claim 10, wherein said chrominance control means comprise linear and/or non-linear matrix circuits.

Claim 13

A System according to claim 10, wherein said chrominance control means comprise further circuits for gamma, black, and white control of the individual color difference signals.

Claim 14

A System according to claim 1 wherein contour correction means are arranged directly after the digital store and wherein the output signal of said contour correction means is added to the luminance signal after said second signal correction means.

Claim 15

A System according to claim 1 wherein the inputs of a color television encoder are connected to the outputs of said second signal correction means.

Claim 16

A System according to claim 1, wherein the inputs of a RGB-matrix are connected to the outputs of said second signal correction means.

Claim 17

A System according to claim 1 comprising contour correction means the output signal of which is adjustable as a function of a control signal and storage means for storing said control signal.

Claim 18

Method of correcting color errors in color television signals generated by scanning a film by a film scanner with a digital frame store, comprising the steps of - during a first film run displaying the signals on a color television monitor and correcting signals being generated by scanning means and being written into a frame store after having been corrected, - storing first correction dates and dates indicating the film position, - scanning a film frame which is deemed to become corrected more precisely and writing into the frame store color television signal related to said film frame, - correcting the signals being read out of the frame store, - storing second correction dates, - during a second film run retreiving the stored first and second correction dates according to the actual film position and correcting the signals correspondingly.

Claim 19

Method of correcting color errors in color television signals generated by scanning a film by a film scanner with a digital frame store, comprising the steps of - during a first film run displaying the signals on a color television monitor and correcting signals being generated by scanning means and being written into a frame store after having been corrected, - storing first correction dates and dates indicating the film position, - scanning a film frame which is deemed to become corrected more precisely and writing into the frame store color television signal related to said film frame, - correcting the signals being read out of the frame store, - storing second correction dates, - during a second film run retreiving the stored first and second correction dates according to the actual film position and correcting the signals correspondingly.

Claim 20

Method according to claim 17, wherein during the first film run one or more film frames are scanned repeatedly.

Claim 21

Method of correcting color errors in color television signals generated by scanning a film by a film scanner with a digital frame store, comprising the steps of: - during a first film run displaying the signals on a color television monitor, - correcting the signals being read-out of the digital frame store in order to reduce color errors, - storing the dates of said correction, - during a second film run applying said dates to correction means, which influence the signals to be written into the digital frame store.

Claim 22

Method of correcting color errors in color television signals generated by scanning a film by a film scanner with a digital frame store, comprising the steps of: - during a first film run displaying the signals on a color television monitor, - correcting the signals being read-out of the digital frame store in order to reduce color errors, - storing the dates of said correction, - during a second film run applying said dates to correction means, which influence the signals to be written into the digital frame store.

Claim 23

Color correction system for a television film scanner which includes an opto-electronic scanning device and a digital frame store comprising signal correction means being alternatively switchable into the signal path between the scanning device and the frame store or into the signal path between the frame store and an output of the signal, control means to control the color correction means by control signals, storage means to store said control signals.

Claim 24

Color correction system for a television film scanner which includes an opto-electronic scanning device and a digital frame store comprising signal correction means being alternatively switchable into the signal path between the scanning device and the frame store or into the signal path between the frame store and an output of the signal, control means to control the color correction means by control signals, storage means to store said control signals.