Method and system for automatically balancing the color channels of color image transmitters
阅读：104发布：2023-07-24
专利汇可以提供Method and system for automatically balancing the color channels of color image transmitters专利检索，专利查询，专利分析的服务。并且Automatic balancing of color channels in a color-image transmitter by providing white-level balance from a neutral white part of the scene, providing black-level balance while no image is produced, then correcting intermediate-level values for gamma correction.，下面是Method and system for automatically balancing the color channels of color image transmitters专利的具体信息内容。
1. A method for automatically balancing color channels in a color-image transmitter as it transmits an image of a scene comprising the steps of: A. providing a chromatically neutral white surface in the scene, B. directing the transmitter to said surface to provide whitelevel signals representative of the surface in various ones of said channels, C. electrically comparing the amplitudes of different whitelevel color components from the white-level signals in each channel to provide electrical signals indicative of white-level errors in the color balance for each channel, D. correcting the amplitudes of the white-level color components in each channel in response to the electrical signals indicative of white-level errors, E. shutting off light from the scene to the transmitter while deriving black-level signals in various channels representative of the lightless scene, F. electrically comparing the amplitudes of different blacklevel color components from the black-level signals in each channel with a reference signal to provide electrical signals indicative of black-level errors in the color balance for each channel, G. correcting the amplitudes of the black-level color components in each channel in response to the electrical signals indicative of black-level errors, H. varying the light intensity from the scene to the transmitter to successively produce a set of intermediate level signals representative of the surface at each of a plurality of intermediate level light values, I. electrically comparing the amplitudes of different intermediate-level color components from the intermediate-level signals in each channel at each intermediate level to provide electrical signals indicative of intermediate-level errors in the color balance, J. storing the electrical signals indicative of intermediate level errors, and K. after storing all of the signals from step J, providing feedback signals to adjust the amplitudes of the respective color components to minimize the sum of all of the stored errors, thereby correcting gamma predistortion of the color components of the transmitted image.
2. A method according to claim 1 wherein the step of shutting off the light is accomplished by shutting off a light supply.
3. A method according to claim 1 wherein the step of shutting off the light is accomplished by interrupting signal production at an optical-to-electrical converter in the color-image transmitter.
4. A method according to claim 1 wherein the step of varying the light intensity is carried out in a stepwise fashion.
5. A method according to claim 1 wherein the step H is not carried out until completion of steps D and G.
6. A method according to claim 1 wherein the steps of claim 1 are controlled by providing a stored program of sequential control for the steps and by selection elements of the stored program by manual switch operation.
7. A system for automatically balancing color channels in a color-image transmitter as it transmits an image of a scene comprising: A. means for providing a chromatically neutral white surface in the scene, B. means for directing the transmitter to said surface to provide white-level signals representative of the surface in various ones of said channels, C. means for electrically comparing the amplitudes of different white-level color components from the white-level signals in each channel to provide an electrical signal indicative of white-level erros in the color balance for each channel, D. means in each channel responsive to the indicated white-level errors in each channel for correcting the aMplitudes of the white-level color components in each channel according to the indicated white-level errors for that channel, E. means for shutting off light from the scene to the transmitter while deriving black-level signals in various channels representative of the lightless scene, F. means for electrically comparing the amplitudes of different black-level color components from the black-level signals in each channel with a reference signal to provide electrical signals indicative of black-level errors in the color balance for each channel, G. means for correcting the amplitudes of the black-level color components in each channel in response to the electrical signals indicative of black-level errors, H. means for varying the light intensity from the scene to the transmitter to successively produce a set of intermediate-level signals representative of the surface at each of a plurality of intermediate level light values, I. means for electrically comparing the amplitudes of different intermediate-level color components from the intermediate-level signals in each channel at each intermediate level to provide electrical signals indicative of intermediate-level errors in the color balance, J. means for storing the electrical signals indicative of intermediate level errors, and K. gamma-predistortion correction means operative after the storage of the intermediate-level electrical signals for providing feedback signals to adjust the amplitudes of the respective color components to minimize the sum of all the stored errors, thereby correcting gamma predistortion of the color components of the transmitted image.
8. A system according to claim 7 further comprising a measuring device in the scene for detecting color temperatures of the light illuminating the scene continuously during the transmittal of the image of the scene and for providing signals for continuous readjustment of the white-level values of the transmitted image.
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