US20030218695A1 - Color reproduction method and system, and video display method and device using the same - Google Patents

Color reproduction method and system, and video display method and device using the same Download PDF

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Publication number
US20030218695A1
US20030218695A1 US10/439,316 US43931603A US2003218695A1 US 20030218695 A1 US20030218695 A1 US 20030218695A1 US 43931603 A US43931603 A US 43931603A US 2003218695 A1 US2003218695 A1 US 2003218695A1
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Prior art keywords
signal
display device
gamma
corrected
video
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English (en)
Inventor
Hee Kim
Kyu Sohng
Eun Kim
Dae Kim
Dong Ryu
Jong Park
Jong Shin
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LG Electronics Inc
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LG Electronics Inc
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Assigned to LG ELECTRONICS INC. reassignment LG ELECTRONICS INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KIM, DAE WON, KIM, EUN SU, KIM, HEE CHUL, PARK, JONG SUN, RYU, DONG WON, SHIN, JONG KEUN, SOHNG, KYU IK
Publication of US20030218695A1 publication Critical patent/US20030218695A1/en
Priority to US11/723,890 priority Critical patent/US7659945B2/en
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/67—Circuits for processing colour signals for matrixing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/68—Circuits for processing colour signals for controlling the amplitude of colour signals, e.g. automatic chroma control circuits
    • H04N9/69—Circuits for processing colour signals for controlling the amplitude of colour signals, e.g. automatic chroma control circuits for modifying the colour signals by gamma correction

Definitions

  • the present invention relates to a color reproduction method and system, and a video display device using the same.
  • a color television system includes a broadcasting station for transmitting broadcast signals that are produced using cameras, and a color television set for processing and reproducing the broadcast signals transmitted from the broadcasting station to allow the audience to see and hear sounds and pictures.
  • the goal is to obtain the reproduced video proportional to luminance of an original object and to reproduce color equal to a chromaticity coordinate of the original object.
  • NTSC National Television System Committee
  • a broadcasting camera for capturing videos obtains an ideal imaging characteristic based on an NTSC standard monitor, and a color television set reproduces the same chromaticity coordinate as an original object irradiated by an illuminant C.
  • aerial-wave broadcasting signals and component signals signal sources of the television sets also have different standards from each other and various sources are actually used.
  • the aerial-wave broadcasting signals are generated from NTSC broadcasting or HDTV broadcasting
  • component signals are generated from DVD or digital still camera.
  • the current television sets can compatibly process variously formatted signal sources (in other words, a TV signal source, a PC signal source, a component signal source, etc), such as HDTV broadcasting signals, cable broadcasting signals, PC signals, DVD signals, VCR signals, etc.
  • various conventional CRT-based display devices Cathode Ray Tube (CRT), Cathode Display Tube (CDT), Cathode Picture Tube (CPT), etc.
  • flat-panel display devices Liquid Crystal Display (LCD), Plasma Display Panel (PDP), Field Emission Display (FED), etc.
  • LCD Liquid Crystal Display
  • PDP Plasma Display Panel
  • FED Field Emission Display
  • FIG. 1 is a schematic view of a related art video display device for processing TV signal.
  • the related art video display device (e.g., TV set) includes a TV signal processor 10 for dividing TV signal into an audio signal and a video signal through tuning/detecting/demodulating operations of the TV signal, and an A/V switch 11 for switching the audio and video signals divided at the TV signal processor 10 .
  • a 3D comb filter 12 is for separating luminance and color signals Y/C from the video signal outputted from the A/V switch 11 .
  • a decoder 13 is for converting the luminance and color signals Y/C into a luminance and color difference signals Y, U and V
  • a video/synchronization processor 14 is for performing a matrix conversion for a color space conversion with respect to the luminance and color difference signals converted at the decoder 13 .
  • An ADC 15 is for converting the luminance and color difference signals into digital video signals
  • a video processor 16 is for converting the digital video signals into color signals R′, G′ and B′
  • a video output unit 17 is for outputting the color signals R′, G′ and B′ converted (e.g. from Y, U, V) at the video processor 16 to a display device (not shown).
  • the luminance and color difference signals are the NTSC TV signal and A/V signals
  • the video/synchronization processor 14 bypasses them.
  • an illuminant C is defined as a reference white of a camera (i.e., the signal source of TV signal).
  • the television sets have different reference white and phosphor according to the kind of display devices.
  • the phosphor coordinates (G) of the display device are very different from the NTSC standard phosphor coordinates or digital television (DTV) standard phosphor coordinates.
  • FIG. 4 is a diagram showing a color reproduction area and a position of the reference white according to a general signal source and a general display device.
  • the NTSC signal source and the SMPTE signal source used as signal sources, and LCD is used as a display device.
  • the original signal provided in the signal production is very difficult to reproduce equally on the display device.
  • a standard gamma of the NTSC TV signal source as shown in FIG. 14, is 2.2
  • the NTSC TV signal source is processed to have a characteristic of FIG. 13A and then transmitted.
  • the LCD PJT television set has a S-shape gamma characteristic curve.
  • FIG. 2 is a schematic view of a related art video display device for processing component signal.
  • the component signal source can include DVD signal and DTV signal.
  • the related art video display device includes a component signal processor 20 for processing component signals Y, PB and Pr, a video/synchronization processor 21 for performing a matrix conversion for a color space conversion with respect to the component signals Y, Pb and Pr outputted from the component signal processor 20 , and an ADC 22 for converting a luminance signal Y and color signals Cb and Cr, which are outputted from the video/synchronization processor 21 , into digital video signals.
  • a video processor 23 is for processing the digital video signals into color signals R′, G′ and B′, and a video output unit 24 is for outputting the color signals R′, G′ and B′ to a display device.
  • an illuminant D65 is defined as a reference white of the component signal source.
  • the display device uses 9300K as the reference white and the phosphor coordinates are equal to the above. Accordingly, in case the component signals are processed at the related art television set and displayed thereon, the same problems can occur as described in the system of FIG. 1.
  • FIG. 3 is a schematic view of a related art video display device for processing PC signal.
  • the related art video display device includes a PC signal processor 30 for processing PC signals, a video/synchronization processor 31 for performing a matrix conversion for a color space conversion with respect to the PC signal outputted from the PC signal processor 30 and an ADC 32 for converting a received luminance signal Y and color signals Cb and Cr into digital video signals.
  • the PC signals R, G and B is outputted to the video/synchronization processor 31 , and the video/synchronization processor 31 performs a matrix conversion with respect to the PC signals R, G and B to output the luminance signal Y and the color signals Cb and Cr.
  • a video processor 33 is for processing the digital video signals into color signals R′, G′ and B′, and a video output unit 34 for formatting and outputting the color signals R′, G′ and B′ to a display device.
  • an illuminant D65 is defined as a reference white of the PC signal source.
  • the calorimetric error occurs because of differences of the reference white and the phosphor coordinates between the signal source and the display device. Accordingly, the calorimetric error causes the video to be displayed incorrectly or unnaturally in color.
  • the colorimetric error can occur because the standard phosphor coordinates of signal source such as TV signal, component signal and PC signals are different from those of the display devices such as CRT, CPT, LCD and PDP.
  • the colorimetric error may be caused by discord of phosphor coordinates between the signal source and the display device.
  • the colorimetric error can occur because of a difference of gamma characteristics between the signal source and the display device.
  • related art video display devices have various disadvantages.
  • Related art video display devices can receive the signal sources that have different standard phosphors and different reference white and are differently gamma-processed, and display them on the display devices that have different standard phosphors and different reference white and are differently gamma-processed.
  • An object of the invention is to solve at least the above problems and/or disadvantages and to provide at least the advantages described hereinafter.
  • Another object of the present invention to provide a color reproduction correcting system and method that is capable of reducing a color reproduction error.
  • Another object of the present invention to provide a video display device and method that is capable of solving a color reproduction error and securing reliability.
  • a color reproduction correcting system that includes a color reproduction correcting system including device for performing a first gamma correction to an input video signal according to a signal source, device for correcting a colorimetric error with respect to the corrected gamma signal, and device for performing a second gamma correction to the corrected colorimetric error signal according to a display device.
  • a video display device that includes an input signal processor that modifies a signal provided from a transmission side to make a predetermined video signal, a plurality of first gamma correctors that operate on the processed video signal according to types of signal sources, a first switching circuit that correlates a signal corresponding to a predetermined signal source type among the first corrected gamma signals, an error correction circuit for correcting colorimetric error with respect to the correlated signal, a plurality of second gamma correctors that operate on the corrected colorimetric error signal according to types of display devices, a second switching circuit that correlates a signal corresponding to a predetermined display device type among the gamma-corrected signals, and a display that displays the signal correlated by the second switching.
  • a color reproduction correcting method that includes performing a first gamma correction to an input video signal according to a signal source, correcting a colorimetric error with respect to the first gamma corrected signal, and performing a second gamma correction to the corrected calorimetric error signal according to a display device.
  • FIG. 2 is a diagram showing a related art video display device for processing component signal
  • FIG. 3 is a diagram showing a related art video display device for processing PC signal
  • FIG. 4 shows a color reproduction area and a position of a reference white according to a general signal source and a general display device
  • FIG. 5 is a block diagram showing an exemplary transmission-side camera that processes color signals in a color television system
  • FIG. 6 is a schematic diagram showing a construction of a color reproduction correcting system in accordance with a first embodiment of the present invention
  • FIG. 7 is a schematic diagram showing a color reproduction method using a matrix conversion in a television system in accordance with a first embodiment
  • FIG. 8 is a schematic diagram showing a construction of a video display device with a color reproduction system when inputting TV signal according to a second embodiment of the present invention
  • FIG. 9 is a schematic diagram showing a construction of a video display device with a color reproduction system when inputting component signal according to a third embodiment of the present invention.
  • FIG. 10 is a schematic diagram showing a construction of a video display device with a color reproduction system when inputting PC signal according to a fourth embodiment of the present invention.
  • FIG. 12 is a schematic diagram showing a construction of a video display device according to a sixth embodiment of the present invention with a hardware color reproduction correction
  • FIGS. 13A to 13 D show exemplary gamma characteristic curves according to signal sources and display devices.
  • FIG. 14 shows exemplary standard specifications of general signal sources.
  • the converted color signals Rc, Gc and Bc are amplified with a predetermined gain by a gain controller 45 , and corrected into gamma-corrected signals Rc′, Gc′ and Bc′ by a gamma corrector 46 so that the gamma-corrected signals Rc′, Gc′ and Bc′ are outputted.
  • the gamma-corrected signals Rc′, Gc′ and Bc′ are encoded by an encoder and transmitted through an antenna.
  • stimuli X, Y and Z of the original objects 41 inputted into the camera are converted into the color signals Rc, Gc and Bc by a color splitter 43 and R, G and B optical filters 44 a , 44 b and 44 c .
  • the gain controller 45 adjusts white balance so that the reference white of a standard monitor is illuminant C of 6774K.
  • the adjusted color signals Rc, Gc and Bc are corrected into the gamma-corrected signals Rc′, Gc′ and Bc′ and the encoder 47 makes composite video signal and transmits them.
  • the gamma corrector 46 is processed with gamma correction of 2.2.
  • each coordinate of the reference white and the standard gamma are recommended in a Standard regulation or specification for each signal source. However, the phosphor, each coordinate of the reference white and the standard gamma depend on each of the signal sources.
  • the color signals made of different values are inputted to a video display device.
  • the reliability of color in color televisions or HDTV systems can be maintained by setting the signal source and the display device to the equal reference white and phosphor characteristic and the color reproduction error can be also reduced.
  • the reference white of the current television set is set to a color temperature higher than that of the signal source to realize brighter video, a greater color reproduction error occurs.
  • the reliability of color in color televisions or HDTV systems can be maintained by setting the signal source and the display device to the equal reference white and phosphor characteristic and the color reproduction error can be also reduced.
  • the reference white of the current television set is set to a color temperature higher than that of the signal source to realize brighter video, a greater color reproduction error occurs.
  • the specific video display device makes colorimetric errors since each coordinate of the reference white of the signal source, the phosphor and the standard gamma value depend on each of the signal sources are different from those of a specific video display device.
  • various display components are employed in the video display device and the reference white, the phosphor and the gamma value of the employed display components can be different from each other. So, the calorimetric errors become more serious or frequent.
  • preferred embodiments of color reproduction methods and video display devices should consider characteristics of both different signal sources and different display devices.
  • Preferred embodiments according to the present invention can solve or reduce the above-described problems or disadvantages.
  • a CPU 108 is for controlling the inverse gamma corrector 102 , the colorimetric error corrector 104 , the gamma corrector 106 and a memory 110 .
  • the memory 110 is for storing signal source information and display element information provided by the CPU 108 .
  • the inverse gamma corrector 102 preferably performs inverse gamma correction to the gamma-corrected signal (e.g., TV signal, component signal, PC signal or the like), for example, at a transmitter of a color television system.
  • gamma correction is performed to a NTSC signal of a TV signal with gamma value of 2.2.
  • the signal to which gamma correction is performed by the inverse gamma corrector 102 can have a linear characteristic.
  • the gamma corrector 106 preferably performs gamma correction to the signal corrected the colorimetric error corrector 104 with gamma value of the display element employed by the video display device.
  • display element performs inverse gamma correction to a video signal with its own gamma value and displays it.
  • a CRT, an LCD and a PDP have gamma values of 2.2, 2.4 and 1, respectively.
  • the gamma correction with CRT gamma value of 2.2 is usually performed to make a video signal.
  • Inverse gamma correction is performed to the video signal with the gamma value of the display element.
  • the LCD e.g., gamma value of 2.4
  • PDP e.g., gamma value of 1
  • inverse gamma correction is performed to the video to which gamma correction was performed with gamma value of 2.2 at a transmitter. So, the video that has non-linearity instead of a linearity is displayed on the display element.
  • the gamma corrector 106 performs gamma correction to a video signal with the gamma value of the display element so that the video can be displayed with a linearity caused by the inverse gamma correction with the gamma value of the display when the video signal corrected with gamma correction is displayed on the display element.
  • the CPU 108 preferably has information on signal sources of a video signal and display elements.
  • the present invention is not intended to be so limited.
  • the information could be stored elsewhere so long as it is accessible to the CPU 108 .
  • an OSD screen can be used to allow a user to select each of signal sources so that the CPU 108 recognizes the type (e.g., kind) of the selected signal source.
  • the selection menu for each signal source is provided on an OSD screen. If the user selects one item for a specific signal source in the menu for signal sources, the CPU 108 recognizes a specific signal source and finds out the kind of the corresponding signal source.
  • a remote controller has buttons to select each of the signal sources. If the user selects one of these buttons, the CPU 108 recognizes a specific signal source and determines the kind of the corresponding signal source.
  • an output terminal has a plurality of output ports to be coupled to a plurality of display elements.
  • the CPU 108 can recognize the output port of the plurality of output ports, which is coupled to the display element, so that the kind of the display element can be found easily. For example, if output ports 1 , 2 and 3 are allocated to CRT, LCD and PDP respectively and a PDP display element is coupled to the output port 3 , the CPU 108 can recognize that the kind of the display element employed now is PDP.
  • the CPU 108 preferably reads the gamma value corresponding to the coupled signal source from the memory 110 according to the kind of the found signal source and sends the gamma value to the inverse gamma corrector 102 .
  • the CPU 108 can control the inverse gamma corrector 102 to perform inverse gamma correction to the video signal with the gamma value of the found signal source.
  • the CPU 108 preferably reads the gamma value corresponding to the connected display element from the memory 110 according to the kind of the found display element and sends the gamma value to the gamma corrector 106 .
  • the CPU 108 can control the gamma corrector 106 to perform gamma correction to the video signal corrected by the calorimetric error corrector 104 with the gamma value of the found display element.
  • the CPU 108 can read the signal source information and the display element information from the memory 110 according to the kind of the found signal source and the kind of the found display element and sends the signal source information and the display element information to the calorimetric error corrector 104 . Accordingly, the CPU 108 controls the calorimetric error corrector 104 to perform colorimetric error correction to the video signal.
  • the signal source information can include the kind of a signal source, the gamma information of each signal source, the coordinate of reference white for each signal source, the coordinate of phosphor of each signal source or the like.
  • the display element information can include the kind of a display element, the gamma information of each display element, the coordinate of reference white for each display element, the coordinate of phosphor of each display element or the like.
  • the signal source is exemplified by a TV signal, a component signal, PC signal and the like.
  • the TV signal is a NTSC signal, a PAL signal or any signal that can be used as a TV signal.
  • the component signal is a DVD signal, a VTR signal, DTV signal or any signal that can be used as a component signal.
  • the display element is CRT, CDT, CPT, LCD, PDP, FED or any display element that currently or will be employed as a display element in a television system.
  • the calorimetric error corrector 104 performs matrix transformation to the signal source information and the display element information provided from the memory 110 and corrects calorimetric error under the control of the CPU 108 .
  • the signal information represents coordinate of the reference white of signal source and coordinate of phosphor for the inputted video signal.
  • the display information represents coordinate of the reference white and coordinate of phosphor for the currently employed display element.
  • FIG. 7 is a schematic view of color reproduction method using matrix transformation in a television system according to a first embodiment of the present invention.
  • the television system can include a transmitting camera 200 and a receiving video display device 220 that includes a color reproduction correction system 223 and a display element 226 .
  • An exemplary matrix transformation correction in the television system described above will now be described.
  • Color stimuli X, Y and Z for an object in the transmitting camera 100 is converted into color signals R, G and B (step S 311 ).
  • the color signals R, G and B converted at step S 311 are then corrected with gamma correction using the gamma value of the corresponding signal source (step S 314 ).
  • gamma correction is performed to an NTSC signal with gamma value of 2.2 and to a PAL signal with gamma value of 2.8.
  • the signal to which gamma correction is performed at the step S 314 can be transmitted through an antenna.
  • the gamma-corrected signal inputted to a color production system 223 of the video display device 220 is corrected with inverse gamma correction using the gamma value corresponding to the signal source and has linearity (step S 317 ) (Refer to FIGS. 13A and 13B).
  • the calorimetric error caused from the difference between coordinates of reference white and phosphor of the signal source and those of the display element can be corrected using matrix transformation owing to signal modified or corrected with inverse gamma correction at step S 317 (step S 320 ).
  • the calorimetric error signal corrected at step S 320 can be corrected with gamma correction using the gamma value corresponding to the display element (step S 323 ).
  • gamma correction can be performed in the CRT with gamma value of ⁇ fraction (1/2.2) ⁇ (e.g., shown in FIG. 13C), in a LCD so as to make an inverse S curve and in a PDP so as to make linearity (e.g., shown in FIG. 13D).
  • the signal corrected with gamma correction at the step S 323 can be applied to the display element 226 and corrected with inverse gamma correction with the gamma value of the display element (step S 326 ).
  • the signal corrected with inverse gamma correction at the step S 326 can be recovered to color stimuli X, Y and Z of the original object.
  • inverse gamma correction is performed to the signal source by the color reproduction correction system
  • gamma correction is performed by the display element and calorimetric error between the signal source and the display element is corrected so that the color reproduction quality is enhanced and reliability of the video display device is improved.
  • One process to find the matrix to convert the stimuli X, Y and Z into the color signals R, G and B in the camera can be as follows.
  • XRc, YRc and ZRc represent three stimuli X, Y and Z of R phosphor.
  • XGc, YGc and ZGc represent three stimuli X, Y and Z of G phosphor.
  • XBc, YBc and ZBc represent three stimuli X, Y and Z of B phosphor. Accordingly, the stimuli X, Y and Z of the phosphors can be represented as Expression 3 using Expression 1.
  • xRc, yRc and zRc represent a coordinate of R phosphor.
  • xGc, yGc and zGc represent a coordinate of G phosphor.
  • xBc, yBc and zBc represent a coordinate of B phosphor.
  • Expression 4 If Expression 4 is substituted in Expression 3, the relation between R, G and B stimuli and X, Y, Z stimuli can be represented as Expression 5.
  • Expression 6 When Expression 6 is represented in matrix form, Expression 6 can be represented as Expression 7.
  • the channel gains can be found from coordinates x, y and z of the phosphor and the reference white to be used in the display element.
  • the R, G and B channel gains can be found from the coordinate of the phosphor and the coordinate of the reference white of the display element 226 to be employed in the video display device. Further, the conversion matrix from the channel gains and the coordinate of the display phosphor into X, Y and Z stimuli can be obtained.
  • the luminance of the reference white can be normalized as 1 .
  • Expression 11 can be represented in matrix form as Expression 12.
  • the channel gains KRd, KGd and KBd of R, G and B in the display element 226 can be determined in Expression 12.
  • Expression 12 can be represented as Expression 13.
  • each of the channel gains of the display element can be found from the coordinate x, y and z of the phosphor and the coordinate x, y and z of the reference white.
  • the conversion matrix from R, G and B signals into the implemented X, Y and Z stimuli using channel gains and the coordinate of the phosphor is represented as Expression 14 based on Expression 10.
  • Expression 14 can represent the implemented colors of the display element that receives color signal input (e.g., video voltage signal).
  • Color reproduction correction can be performed in a color reproduction correction system.
  • the error correction matrix correction method to reduce calorimetric error of the implemented color caused by the difference between phosphors of the NTSC standard monitor and the display element can be described as follows.
  • Expression 15 can be represented as Expression 16.
  • Expression 19 can be determined from Expressions 16 and 18.
  • Expression 19 can be represented as Expression 20.
  • M represents matrix conversion. This matrix conversion can be represented as Expression 21, referring to Expressions 16 and 18.
  • the matrix conversion M can be found when the coordinate of the reference white and the coordinate of phosphor of the signal source and those of the displayed are given.
  • the colorimetric error corrector 104 can correct colorimetric error through the matrix conversion using the signal source information and the display element information stored in the memory 110 .
  • an inverse gamma corrector 102 can perform inverse gamma correction with the gamma value of a specific signal source to the signal corrected with gamma correction with the gamma value of the specific signal source at a transmitter so that the signal with linearity is generated.
  • the colorimetric error corrector 104 performs colorimetric error correction to the signal with linearity.
  • the gamma corrector 106 performs gamma correction to the signal with the gamma value of a specific display element. Similarly, the gamma-corrected signal is corrected with inverse gamma correction at the display element so that video with linearity is displayed.
  • the embodiment of the color reproduction correction system 100 shown in FIG. 6 can exclude a colorimetric error corrector 104 and only include an inverse gamma corrector 102 , a gamma corrector 106 , a CPU 108 and a memory 110 .
  • the color reproduction correction system 100 can overcome gamma difference between a signal source and a display element.
  • the inverse gamma corrector 102 performs inverse gamma correction for the signal source corresponding to the video signal to the inputted video signal so that a signal with linearity is outputted.
  • Gamma correction for the display element employed now is performed to the signal with linearity inputted to gamma corrector 106 .
  • the corrected gamma signal is corrected with gamma correction at the display element so that the video with linearity is displayed.
  • the gamma information on each signal source and the gamma information on each display element should be stored, for example in the memory 110 .
  • FIG. 8 is a schematic view illustrating a video display device that employs the color reproduction correction system when a TV signal is inputted according to a second embodiment of the present invention.
  • the video display device according to the second embodiment of the present invention can include a TV signal processing unit 120 for processing an inputted TV signal and outputting color signals R′, G′ and B′, a color reproduction correction system 130 for performing color reproduction correction to the color signals R′, G′ and B′ outputted from the TV signal processing unit 120 using TV signal source information and display element information, and a display element 140 for display a color reproduction signal corrected by the color reproduction correction system 130 .
  • the TV signal is a signal that is adjusted with coordinates of a reference white and a phosphor of the TV signal source and corrected with gamma correction when generating a signal.
  • the TV signal processing unit 120 can be similar to the related art.
  • the TV signal processing unit 120 can include a TV signal processor 10 , an A/V switch 11 , a 3D comb filter 12 , a decoder 13 , a video/synchronization processor 14 , an ADC 15 and a video processor 16 .
  • the color reproduction correction system 130 can include an inverse gamma corrector 131 for performing inverse gamma correction to a color signal outputted from the TV signal processing init 120 , a calorimetric error corrector 133 for correcting colorimetric error of the inverse gamma-corrected signal corrected by the inverse gamma corrector 131 , a gamma corrector 135 for performing gamma correction to the calorimetric error corrected signal corrected by the colorimetric error corrector 133 according to the display element, a CPU 137 and a memory 139 .
  • the CPU 137 is for controlling the inverse gamma corrector 131 , the calorimetric error corrector 133 and the gamma corrector 135 , and a memory 139 is for storing TV signal source information and display element information provided by control of the CPU 137 .
  • the memory 139 preferably stores signal information on the TV signal source and display element information on each display element.
  • the memory 139 can store the gamma value of 2.2 for this and information on coordinates of reference white and phosphor of the NTSC signal.
  • the memory 139 can store the gamma value of 2.8 for this and information on coordinates of reference white and phosphor of the PAL signal.
  • the display information can include at least the kind of each display element, coordinate information of reference white and phosphor of each display element, and gamma value.
  • the color reproduction correction in the video display device configured as above will be described.
  • the inputted TV signal is processed by the TV signal processing unit 120 and converted into color signals R′, G′ and B′.
  • the inverse gamma corrector 131 performs inverse gamma correction to the converted color signal based on the TV signal source. Accordingly, the signal outputted from the inverse gamma corrector 131 has linearity.
  • the calorimetric error corrector 133 performs calorimetric error correction to the inverse gamma-corrected signal with linearity.
  • the color error is corrected using coordinate of the reference white and coordinate of phosphor for the TV signal and coordinate of the reference white and coordinate of phosphor for the corresponding display element.
  • This corrected colorimetric error signal is corrected with gamma correction by the gamma corrector 135 for the corresponding display element.
  • the corrected signal is corrected with gamma correction by a display element 140 so that the signal with linearity is displayed.
  • FIG. 9 is a schematic diagram showing a video display device to which a color reproduction system is applied when inputting component signal according to a third embodiment of the present invention.
  • the video display device according to the third embodiment of the present invention can include a component signal processing 150 for processing an inputted component signal to output color signals (R′, G′, B′); a color reproduction correcting system 160 for correcting the color reproduction of the color signals (R′, G′, B′) using a component signal source information and a display device information; and a display device 140 for displaying the color reproduction signals corrected at the color reproduction correcting system 160 .
  • the component signal means a signal that is adjusted and gamma-corrected by a reference white and phosphor coordinate of the component signal source in a component signal production.
  • the component signal processing unit 150 can include the signal processor 20 , the video/synchronization processor 21 , the ADC 22 , and the video processor 23 , as shown in FIG. 2.
  • the color reproduction correcting system 160 can include an inverse gamma corrector 161 for performing an inverse gamma correction to the color signals (R′, G′, B′) according to the component signal source, a colorimetric error corrector 163 for correcting a colorimetric error of the inverse gamma-corrected signals, a gamma corrector 165 for performing a gamma correction to the colorimetric error signal corrected by the calorimetric error corrector 163 according to a display device, a CPU 167 and a memory 169 .
  • the CPU 167 is for controlling the elements 161 , 163 and 165
  • a memory 169 is for storing the component signal source information and the display device information, which are provided by the control of the CPU 167 .
  • the signal source information on respective component signal sources and the display device information on respective display devices are stored in the memory 169 .
  • the component signal source is a DVD signal
  • a gamma value of 2.222 e.g., see ITU-Rec.709 of Table 1
  • a reference white and phosphor coordinate information on the DVD signal can be stored in the memory 169 .
  • the display device information can include at least the kinds of display devices, reference white and phosphor coordinate information on the display devices, and gamma values.
  • a color reproduction correcting method of the video display device of FIG. 9 will be described.
  • the inputted component signal is converted into the color signals (R′, G′, B′) by the component signal processing unit 150 , and then the converted signals are inverse gamma-corrected based on the component signal source by the inverse gamma corrector 161 . Accordingly, the signals outputted from the inverse gamma corrector 161 have a linearity.
  • the calorimetric corrector 163 corrects the colorimetric error of the inverse gamma corrected signal with a linearity. At this time, the colorimetric error is corrected using the reference white and phosphor coordinates of the component signal source and the reference white and phosphor coordinates of the corresponding display device.
  • the corrected colorimetric error signal is gamma-corrected based on the corresponding display device by the gamma corrector 165 .
  • the corrected signal is gamma-corrected by the display device 140 and a video having a linearity is displayed.
  • FIG. 10 is a schematic diagram showing a video display device to which a color reproduction system is applied when inputting PC signal according to a fourth embodiment of the present invention.
  • the video display device according to the fourth embodiment of the present invention can include a component signal processing 170 for processing an inputted PC signal to output color signals (R′, G′, B′), a color reproduction correcting system 180 for correcting the color reproduction of the color signals (R′, G′, B′) using a PC signal source information and a display device information, and a display device 140 for displaying the color reproduction signals corrected at the color reproduction correcting system 180 .
  • the component signal means a signal that is adjusted and gamma-corrected by coordinates of a reference white and a phosphor of the PC signal source in a PC signal production.
  • the component signal processing unit 170 can include the signal processor 30 , the video/synchronization processor 31 , the ADC 32 , and the video processor 33 , as shown in FIG. 3.
  • the color reproduction correcting system 180 can include an inverse gamma corrector 181 for performing an inverse gamma correction to the color signals (R′, G′, B′) according to the PC signal source, a colorimetric error corrector 183 for correcting a colorimetric error of the inverse gamma-corrected signals, a gamma corrector 185 for performing a gamma correction to the colorimetric error signal corrected by the colorimetric error corrector 183 according to a display device, a CPU 187 and a memory 189 .
  • the CPU 187 is for controlling the elements 181 , 183 and 185
  • a memory 189 is for storing the PC signal source information and the display device information, which are provided by the control of the CPU 187 .
  • the signal source information on respective PC signal sources and the display device information on respective display devices are stored in the memory 189 .
  • the PC signal source is a PC signal
  • its gamma value of 2.4 e.g., see sRGB standard of Table 1
  • a reference white and phosphor coordinate information on the PC signal can be stored in the memory 189 .
  • the display device information can include at least the kinds of display devices, reference white and phosphor coordinate information on the display devices, and gamma values.
  • a color reproduction correcting method of the video display device of FIG. 10 will be described.
  • the inputted PC signal is converted into the color signals (R′, G′, B′) by the component signal processing unit 170 , and then the converted signals are inverse gamma-corrected based on the PC signal source by the inverse gamma corrector 181 . Accordingly, the signals outputted from the inverse gamma corrector 181 have a linearity.
  • the colorimetric corrector 183 corrects the colorimetric error of the inverse gamma-corrected signal with a linearity. At this time, the colorimetric error is corrected using the coordinates of the reference white and phosphor of the PC signal source and those of the reference white and phosphor coordinates of the corresponding display device.
  • the corrected calorimetric error signal is gamma-corrected based on the corresponding display device by the gamma corrector 185 .
  • the corrected signal is gamma-corrected by the display device 140 and a video having a linearity is displayed.
  • FIG. 11 is a schematic diagram showing a video display device to which a color reproduction system is applied when inputting a plurality of signal sources according to a fifth embodiment of the present invention.
  • the video display device can include a channel switch 410 for selecting a channel for one signal among the plurality of input signals, a signal processing unit 420 for processing the selected signal, and a color reproduction correcting system 430 for correcting the color reproduction of the processed signal using a signal source information and a display device information.
  • a display device 450 is for displaying the signals corrected at the color reproduction correcting system 430 through an output unit 440 .
  • the channel switch 410 is switched to select one channel among the plurality of signals (e.g., TV signal, component signal, PC signal, etc.).
  • the channel switch 410 is preferably controlled by a CPU 437 .
  • the CPU 437 recognizes a user's selection of the signal source and causes the channel switch 410 to select the signal corresponding to the user's selection.
  • the signal source recognized by the CPU 437 is TV signal
  • the channel switch 410 selects a channel corresponding to the TV signal and the selected TV signal is inputted to the signal processing unit 420 .
  • the signal processing unit 420 processes the plurality of input signals, e.g., TV signal, component signal, PC signal, etc., and then converts them into color signals (R′, B′, G′). Accordingly, it is desired that the signal processing unit 420 include all of the TV signal processing unit 120 of FIG. 8, the component signal processing unit 150 of FIG. 9 and the PC signal processing signal unit 170 of FIG. 10.
  • the TV signal processing unit 120 can include the TV signal processor 10 , the A/V switch 11 , the 3D comb filter 12 , the decoder 13 , the video/synchronization processor 14 , the ADC 15 and the video processor 16 .
  • the component signal processing unit 150 can include the signal processor 20 , the video/synchronization processor 21 , the ADC 22 and the video processor 23 , as show in FIG. 2.
  • the PC signal processing unit 170 can include the PC signal processor 30 , the video/synchronization processor 31 , the ADC 32 and the video processor 33 , as shown in FIG. 3.
  • the channel switched signal provided from the channel switch 410 is inputted to the signal processing unit 420 and converted into the color signals R′, G′, B′).
  • the color reproduction correcting system 430 preferably includes an inverse gamma corrector 431 for performing an inverse gamma correction to the color signals (R′, G′, B′) using gamma information on the corresponding signal source, a colorimetric error corrector 433 for correcting a colorimetric error of the inverse gamma-corrected signals, and a gamma corrector 435 for performing a gamma correction to the colorimetric error signal corrected by the colorimetric error corrector 433 using gamma information on the display device.
  • a CPU 437 can control the elements 410 , 431 , 433 , 435 and 440
  • a memory 439 can store the signal source information and the display device information, which are provided by the control of the CPU 437 .
  • the CPU 437 recognizes the selected signal source using the signal source mode.
  • the output unit 440 preferably includes a plurality of output ports Port 1 to PortN to which respective display devices can be connected. At this time, specific display devices can be connected to corresponding allocated output ports Port 1 to PortN, respectively. For example, a CRT, an LCD and a PDP can be connected to the output ports Port 1 , Port 2 and Port 3 , respectively.
  • the CPU 437 can check the connected display device by recognizing a port to which the specific display device is connected.
  • the present invention is not intended to be so limited as other display deice recognition method and apparatus may be used
  • the CPU 437 can recognize the display device that the user selects, for example, using the remote controller or the OSD screen.
  • the color reproduction correcting system 430 uses the information on the selected display device, and the signals outputted from the color reproduction correcting system 430 can be displayed on the display device 450 selected by the user.
  • the CPU 437 controls the respective elements 410 , 431 , 433 , 435 and 440 using the checked signal source and display device. In other words, the CPU 437 can provide the checked signal source to the channel switch 410 to allow the channel switch 410 to select the corresponding channel.
  • the CPU 437 reads out the gamma information on the corresponding signal source from the memory 439 based on the checked signal source and then controls the inverse gamma corrector 431 to perform the inverse gamma correction to them.
  • the CPU 437 reads out the signal source information and the display device information from the memory 439 based on the checked signal source and the checked display device and then controls the colorimetric error corrector 433 to perform the colorimetric error correction to them.
  • the CPU reads out the gamma information on the corresponding display device from the memory 439 based on the checked display device and then controls the gamma corrector 435 to perform the gamma correction to them.
  • the memory 439 stores information that is used to allow the CPU to control the elements 410 , 431 , 433 , 435 and 440 .
  • the memory 439 stores the signal source information and the display device information.
  • the respective signal source information can include at least the kinds of signal sources, the gamma information on the signal source, and the coordinates of respective reference white and phosphor of the signal sources.
  • the respective display device information can include at least the kinds of display devices, the gamma information on the display devices, the respective reference white and phosphor coordinates of the display device.
  • the display device can include CRT, CPT, CDT, LCD, PDP, FED, etc.
  • a color reproduction method of the video display device of FIG. 11 will now be described.
  • a plurality of signals are inputted to the channel switch from an exterior (e.g., a transmission side).
  • the channel switch 410 is switched to select a channel corresponding to one signal among the plurality of signals according to the signal source checked by the CPU 437 .
  • the selected signal is inputted the signal processing unit 420 .
  • the signal processing unit 420 outputs the color signals (R′, G′, B′).
  • the color signals are inputted to the inverse gamma corrector 431 .
  • the inverse gamma corrector 431 performs an inverse gamma correction to the color signals using the gamma information on the signal source to thereby output the signal having a linearity.
  • the calorimetric corrector 433 corrects the calorimetric error of the inverse gamma-corrected signal with a linearity. At this time, the calorimetric error is corrected based on the reference white and phosphor coordinates of the signal source and the reference white and phosphor coordinates of the corresponding display device.
  • the corrected colorimetric error signal is gamma-corrected based on the gamma information on the corresponding display device by the gamma corrector 435 .
  • the gamma-corrected signal is transmitted through the output unit 440 to the corresponding display device and the video with a linearity is displayed thereon.
  • the video display device checks the signal source corresponding to the input signal and generates the signal having a linearity through the inverse gamma correction. Then, the video display device corrects the colorimetric error between the corresponding signal source and the checked display device. The resulting signal is gamma-corrected based on the gamma value of the checked display device, so that the color reproduction efficiency and the reliability of the video display device are improved.
  • FIG. 12 is a schematic diagram showing a construction of a video display device according to a sixth embodiment of the present invention.
  • the color reproduction correction can be implemented with hardware.
  • the video display device can include a channel switch 410 for selecting a channel corresponding to one signal among the plurality of input signals, a signal processing unit 420 for processing the selected signal, and a plurality of inverse gamma correctors 532 , 534 and 536 for performing an inverse gamma correction to the processed signals according to the signal sources.
  • a first switch 540 is for selecting the inverse gamma-corrected signal corresponding to the signal source among the plurality of inverse gamma-corrected signals
  • a colorimetric error corrector 550 is for correcting the colorimetric error of the signal selected by the first switch 540 using the signal source information and the display device information.
  • a plurality of gamma correctors 562 , 564 and 566 can perform the gamma correction to the calorimetric error signal, which is corrected at the calorimetric error corrector 550 , according to the kinds of display devices.
  • a second switch 570 is for selecting a signal corresponding to the display device among a plurality of gamma-corrected signals, and a display device 450 for displaying the signal selected by the second switch 570 through an output unit 440 .
  • the video display device can further include a CPU 580 for checking the display device connected to the currently inputted signal source and controlling the respective elements 410 , 540 , 550 and 440 using the checked information and a memory 590 .
  • the memory 590 is for storing the signal source information and the display device information, which are provided to the colorimetric error corrector 550 , under a control of the CPU 580 .
  • the signal source information can include at least the kinds of signal sources and the reference white and phosphor coordinates of the signal sources
  • the display device information can include at least the kinds of display devices and the reference white and phosphor coordinates of the display devices.
  • the memory 439 of FIG. 11 includes the gamma information on the signal sources and the gamma information on the display device
  • the memory 590 of FIG. 12 does not include such a gamma information. The reason is that the gamma information is implemented with hardware, i.e., the plurality of inverse gamma correctors 532 , 534 and 536 and the plurality of gamma correctors 562 , 564 and 566 .
  • the channel switch 410 is switched to select one of the input signals inputted according to the checked signal source provide from the CPU 580 .
  • the signal processing unit 420 processes the switched signal to output the color signals (R′, B′, G′).
  • the color signals are inputted to the plurality of inverse gamma correctors 532 , 534 and 536 and inverse gamma-corrected according to the kinds of signal sources. At this time, it is desired to provide the plurality of inverse gamma correctors 532 , 534 and 536 preferably one for each type of signal source. However, the present invention is not intended to be so limited.
  • the inverse gamma-corrected signals are switched to allow the first switch 540 to select the signal corresponding to the signal source.
  • the CPU 580 recognizes the PC signal and provides it to the first switch 540 .
  • the first switch 540 is switched to select the inverse gamma-corrected signal corresponding to the recognized PC signal.
  • the colorimetric error corrector 550 corrects the calorimetric error of the switched signal using the signal source information and the display device information, which are provided from the memory 590 .
  • the colorimetric error signals corrected by the colorimetric error corrector 550 are inputted to the plurality of gamma correctors 562 , 564 and 566 , and the plurality of gamma correctors 562 , 564 and 566 performs the gamma correction according to the kinds of display devices.
  • the plurality of gamma-corrected signals are inputted to the second switch 570 and the second switch 570 is switched to select the signal corresponding to the display device.
  • the display device means a device that is coupled to the output unit, which is previously checked by the CPU 580 and is being used currently.
  • the signal switched by the second switch 570 is transmitted through the output unit to the display device 450 and displayed thereon.
  • a memory capacity can be reduced since the respective gamma information on the signal sources and the display devices is implemented with hardware, instead of storing the information in the memory.
  • preferred embodiments of methods and apparatus for color correction and video display devices have various advantages.
  • the improved reliability of products and increased playback accuracy can be obtained by solving the discord of the reference white and phosphor coordinates between the signal sources and the display devices based on the kinds of previously checked signal sources and the kinds of display devices.
  • the video with a linearity can be displayed on a corresponding display device by performing the inverse gamma correction to both the inputted signal sources and the display devices.
  • video distortion can be also reduced or prevented.

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  • Signal Processing (AREA)
  • Processing Of Color Television Signals (AREA)
  • Controls And Circuits For Display Device (AREA)
  • Transforming Electric Information Into Light Information (AREA)
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US7659945B2 (en) 2010-02-09
GB2389981B (en) 2005-06-29
FR2840149A1 (fr) 2003-11-28
NL1023495A1 (nl) 2003-11-25
US20070171309A1 (en) 2007-07-26
NL1023495C2 (nl) 2004-01-06
CN1461151A (zh) 2003-12-10
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FR2840149B1 (fr) 2004-12-31
CN1291606C (zh) 2006-12-20

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