Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N9/00—Details of colour television systems
  • H04N9/12—Picture reproducers
  • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
  • H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
  • H04N9/3105—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying all colours simultaneously, e.g. by using two or more electronic spatial light modulators
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N9/00—Details of colour television systems
  • H04N9/12—Picture reproducers
  • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
  • H04N9/3141—Constructional details thereof
  • H04N9/315—Modulator illumination systems
  • H04N9/3155—Modulator illumination systems for controlling the light source
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N9/00—Details of colour television systems
  • H04N9/12—Picture reproducers
  • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
  • H04N9/3179—Video signal processing therefor
  • H04N9/3182—Colour adjustment, e.g. white balance, shading or gamut

Definitions

• Image display device Description Image display device, image display method, and computer-readable recording medium on which image display program is recorded
• the present invention relates to an image display device, an image display method, and a computer-readable recording medium on which an image display program is recorded.
• liquid crystal display device capable of changing the optical characteristics by electrically controlling the arrangement of liquid crystal molecules is particularly expected from the viewpoints of low power consumption, thinness, and ease of use.
• a projection type liquid crystal display device liquid crystal projector
• this projection type liquid crystal display device uses a liquid crystal light valve as a light modulating means
• the range of displayable brightness is limited by light leakage and stray light generated by various optical elements constituting the optical system.
• Methods for increasing the contrast have been proposed in the past. However, when the image displayed on the light valve is expanded, the color (saturation) of the projected image changes.
• the present invention has been made in view of the above circumstances, and has been made in consideration of the above circumstances.
• An image display device, an image display method, and an image display method capable of changing a dynamic range (a range of displayable brightness) of a display image without changing a ratio of image signals of a plurality of basic colors according to an image signal. It is an object of the present invention to provide a computer-readable recording medium on which an image display program is recorded.
• a first aspect of the present invention is an image display device that adjusts a display image by changing a light amount, and expands image signals of a plurality of basic colors of the display image based on a predetermined expansion coefficient.
• Expansion means image signal conversion means for converting the image signal expanded by the expansion means into color information including saturation and lightness; correction means for correcting the saturation of the color information;
• Color information conversion means for converting the color information including the corrected saturation into image signals of a plurality of basic colors.
• An image display method for adjusting a display image by changing the amount of light comprising: a first step of expanding image signals of a plurality of basic colors of the display image based on a predetermined expansion coefficient; A second step of converting the image signal decompressed by the step (b) into color information including saturation and lightness, a third step of correcting the saturation of the color information, and a third step. A fourth step of converting color information including the corrected saturation into image signals of a plurality of basic colors.
• a second aspect of the present invention is an image display device that adjusts a display image by changing the amount of light, and converts image signals of a plurality of basic colors of the display image into color information including saturation and lightness.
• Image signal conversion means for converting; correction means for correcting the saturation of the color information; expansion means for expanding the brightness of the color information converted by the image signal conversion means based on a predetermined expansion coefficient;
• Color information conversion means for converting color information including the lightness expanded by the expansion means and the corrected saturation into image signals of a plurality of basic colors.
• An image display method for adjusting a display image by changing a light amount comprising: a first step of converting image signals of a plurality of basic colors of the display image into color information including saturation and lightness; A second step of correcting the saturation of the color information, a third step of expanding the lightness of the color information after the conversion in the first step based on a predetermined expansion coefficient, and the third step
• the color information including the lightness expanded by the above and the corrected saturation is converted into image signals of a plurality of basic colors.
• the conversion of the image signal into the color space by the image signal conversion means includes, for example, conversion into an HSV space and conversion into a YuV space.
• the correction means corrects the S signal, which is a signal representing color vividness, when the image signal is converted to the HSV space.
• the correction means corrects the u signal and the V signal, which are signals representing colors.
• the image display device and the image display method according to the first aspect convert the image signals of a plurality of expanded basic colors into color information including saturation and lightness, correct the saturation, and then perform the color information Is inversely converted into image signals of a plurality of basic colors, so that the dynamic range of the display image can be changed without changing the ratio of the image signals of the plurality of basic colors.
• An image display device and an image display method according to a second aspect convert image signals of a plurality of basic colors into color information including saturation and lightness, and after performing expansion of lightness and correction for saturation, color information is converted. Since the image signal is inversely converted into image signals of a plurality of basic colors, the dynamic range of the display image can be changed without changing the ratio of the image signals of the plurality of basic colors.
• the correction calculation becomes simple, and the processing can be sped up. Also, in the conversion to the Y uV space by the image signal conversion means, since the conversion processing to the Y uV space is performed based on a predetermined formula, the conversion processing is fast, and the processing speed of the entire correction processing is increased. Can be.
• a third aspect of the present invention is an image display device that adjusts a display image by changing the amount of light, and performs an offset process based on an offset value on image signals of a plurality of basic colors of the display image.
• Offset processing means for performing, an expansion means for expanding the image signal after the offset processing by the offset processing means based on a predetermined expansion coefficient, and color information including saturation and brightness of the image signal expanded by the expansion means.
• Image signal converting means for converting the color information into color image information; converting the color information including the saturation corrected by the correcting means into image signals of a plurality of basic colors. Means.
• an image display method for adjusting a display image by changing the amount of light.
• a fourth aspect of the present invention is an image display device that adjusts a display image by changing the amount of light, the image information of a plurality of basic colors of the display image being represented by color information including saturation and brightness.
• Image signal converting means for converting the color information into color information; correcting means for correcting the saturation of the color information; and offset processing for performing an offset processing based on an offset value for the brightness of the color information converted by the image signal converting means.
• Color information conversion means for converting color information including degrees into image signals of a plurality of basic colors.
• An image display method for adjusting a display image by changing a light amount comprising: a first step of converting image signals of a plurality of basic colors of the display image into color information including saturation and lightness; A second step of correcting the saturation of the color information, a third step of performing an offset process based on an offset value on the brightness of the color information after the conversion in the first step, A fourth step of expanding the lightness of the color information after the offset processing in the third step based on a predetermined expansion coefficient; and the lightness expanded by the fourth step and corrected by the second step.
• the image display device and the image display method according to the third and fourth aspects are such that the offset processing means performs an offset process based on an offset value so as not to change the vividness of the image signal.
• the offset process is a process of subtracting or adding an offset value to an image signal so as not to change the vividness of the image signal.
• the image display device and the image display method according to the third and fourth aspects perform an offset process on the brightness of the image signal before being converted into the color space or the color information after being converted into the color space. The vivid parts stand out, so the effect of saturation correction can be further exerted.
• an image display apparatus for adjusting a display image by changing a light amount, wherein a predetermined calculation formula is applied to each of a plurality of basic color image signals of the display image.
• Correction means for correcting the saturation of the image signal based on the correction value.
• An image display method for adjusting a display image by changing the amount of light wherein the saturation of the image signal is calculated based on a predetermined calculation formula for each of the image signals of a plurality of basic colors of the display image. Is corrected.
• a sixth aspect of the present invention is an image display device that adjusts a display image by changing the amount of light, the image display device including a plurality of display images. Conversion means for decompressing each of the basic color image signals based on a predetermined conversion table, and correction means for correcting the saturation of the image signal of each color converted by the conversion means. Is provided.
• An image display method for adjusting a display image by changing the amount of light wherein an expansion or offset process is performed on each of a plurality of basic color image signals of the display image based on a predetermined conversion table. And a second step of correcting the saturation of the image signal of each color converted by the first step.
• the image display device of the present invention may further include a detection unit that detects an amount of light leakage, and the correction unit may be configured to perform correction based on the amount of light leakage.
• the amount of light leakage is the amount of light displayed when the display is set to be the darkest in the light valve.
• the correction unit when performing the correction, the correction unit considers the amount of light leakage, so that more accurate saturation correction can be performed.
• the expansion unit expands based on a predetermined expansion coefficient, and predicts the saturation based on at least one of the offset value and the expansion coefficient and the light leakage amount.
• the correction means may be configured to perform correction based on the saturation predicted by the prediction means. With this configuration, since the correction unit performs the correction based on the saturation predicted by the prediction unit, accurate saturation correction can be performed.
• the image processing apparatus further includes a selection unit that selects one of the plurality of saturations predicted by the prediction unit, wherein the correction unit performs correction based on the saturation selected by the selection unit. Is also good.
• the selection unit can select the correction method by the correction unit, so that the correction can be performed according to the user's specifications.
• the plurality of saturations predicted by the prediction means include, for example, a saturation predicted based on an expanded image signal, a saturation predicted based on an unexpanded image signal, and the like.
• the correction by the correction means includes a correction for increasing the vividness and a correction for reducing the vividness.
• the correction to enhance the vividness is a correction to match the predicted saturation based on the expanded image signal.
• the correction for lowering the vividness is a correction for adjusting to a saturation predicted based on an image signal that has not been expanded.
• a computer-readable recording medium storing an image display program for adjusting a display image by changing a light amount, the image signal comprising a plurality of basic colors of the display image.
• a decompression function based on a predetermined decompression coefficient, an image signal conversion function of converting the image signal decompressed by the decompression function into color information including saturation and brightness, and a correction of the saturation of the color information.
• a color information conversion function of converting color information including saturation corrected by the correction function into image signals of a plurality of basic colors.
• a computer-readable recording medium storing an image display program for adjusting a display image by changing a light amount, the image signal comprising a plurality of basic color image signals of the display image.
• a computer executes a decompression function for decompressing based on a coefficient and a color information conversion function for converting color information including the brightness and the corrected chroma decompressed by the decompression function into image signals of a plurality of basic colors.
• a ninth aspect of the present invention is a computer-readable recording medium storing an image display program for adjusting a display image by changing a light amount, the image signal comprising a plurality of basic color image signals of the display image.
• An offset processing function for performing offset processing based on an offset value; a decompression function for decompressing the image signal after the offset processing by the offset processing function based on a predetermined decompression coefficient;
• causing the computer to execute a color information conversion function of converting the image signals into a plurality of basic color image signals.
• FIG. 1 is a schematic configuration diagram illustrating an example of a projection display device.
• FIG. 2 is a block diagram illustrating a configuration of a drive circuit of the projection display device according to the first embodiment.
• FIG. 3 is a block diagram illustrating a configuration of an image processing unit when an image signal is converted into an HSV space.
• FIG. 4 is a diagram illustrating the HSV color space.
• FIG. 5 is a block diagram showing a modification of the image processing unit in FIG.
• FIG. 6 is a block diagram illustrating a configuration of an image processing unit when an image signal is converted into a Yuv space.
• FIG. 7 is a block diagram showing a modification of the image processing unit in FIG.
• FIG. 8 is a block diagram illustrating a configuration of a drive circuit of the projection display device according to the second embodiment.
• FIG. 9 is a block diagram illustrating a configuration of an image processing unit according to the second embodiment in a case where an image signal is converted into an HSV space.
• FIG. 10 is a block diagram showing a modification of the image processing unit in FIG.
• FIG. 11 is a block diagram illustrating a configuration of an image processing unit according to the second embodiment in a case where an image signal is converted into a Yuv space.
• FIG. 12 is a block diagram showing a modification of the image processing unit in FIG.
• FIG. 13 is a block diagram illustrating a configuration of an image processing unit according to the third embodiment.
• FIG. 14 is a block diagram illustrating a configuration of a drive circuit of the projection display device according to the fourth embodiment.
• FIG. 15 is a diagram showing an example of the conversion table.
• FIG. 16 is a block diagram illustrating a configuration of an image processing unit according to the fourth embodiment when a conversion table is used.
• FIG. 17 is a block diagram illustrating a configuration of an image processing unit according to the fourth embodiment in a case where the image is converted into an HSV space.
• FIG. 18 is a block diagram showing a modification of the image processing unit in FIG.
• FIG. 19 is a block diagram showing a configuration of a drive circuit when an encoded image signal is input.
• FIG. 20 is a diagram showing a modified example of the drive circuit of FIG. BEST MODE FOR CARRYING OUT THE INVENTION
• FIG. 1 is a schematic configuration diagram illustrating an example of a projection display device.
• the projection display device has a light source 5 10, a dimming element 26, ISK Mirror 5 1 3, 5 1 4, Reflection Mirror 5 15, 5 16, 5 17, Relay Lens 5 18, 5 19, 5 20, Liquid Light Valve for Red Light 5 2 2, For Green Light It has a liquid crystal light valve 523, a blue light liquid crystal light valve 524, a cross dichroic prism 525, and a projection lens system 526.
• the dimming element 26 is formed of, for example, a liquid crystal panel whose transmittance is variable.
• the light source 5110 is composed of a lamp 511 such as an extra-high pressure mercury lamp and a reflector 512 that reflects light of the lamp 511. Between the light source 510 and the dichroic mirror 5 13, a dimming element 26 for adjusting the amount of light from the light source 5 10 is disposed.
• the dichroic mirror 5 13 that reflects blue light and green light transmits red light out of white light from the light source 5 10 and reflects blue light and green light.
• the transmitted red light is reflected by the reflection mirror 5 17 and is incident on the liquid crystal light valve 5 22 for red light.
• the green light reflected by the dichroic mirror 5 13 is reflected by a green light reflecting dichroic mirror 5 14 and is incident on a green light liquid crystal light valve 5 23.
• the blue light reflected by the dichroic mirror 5 13 passes through the dichroic mirror 5 14, and the relay lens 5 18, the reflective mirror 5 15, the relay lens 5 19, and the reflection
• the light enters the liquid crystal light valve for blue light 524 via a relay system 521 including a mirror 516 and a relay lens 520.
• This prism has four right angle prisms bonded together, and a dielectric multilayer film that reflects red light and a dielectric multilayer film that reflects blue light are formed in a cross shape on the inner surface.
• the three color lights are combined by these dielectric multilayer films to form light representing a color image.
• the synthesized light is projected on a screen 527 by a projection lens system 526, which is a projection optical system, and the image is enlarged and displayed.
• Each liquid crystal light valve 5 2 2, 5 2 3, 5 2 4 has a color An image processing unit (not shown in FIG. 1) that performs predetermined image processing on light is connected.
• the image signal that has undergone the predetermined image processing in the image processing unit is supplied to each of the liquid crystal light valves 522, 523, 524 via a light valve driver.
• the projection display device performs image display based on predetermined image processing performed in the image processing unit.
• FIG. 2 is a block diagram illustrating a configuration of a drive circuit of the projection display device according to the first embodiment.
• the image signal is input to the image processing unit 21 and the image analysis unit 24.
• the image analysis unit 24 analyzes the image signal to calculate a decompression coefficient, and supplies it to the image processing unit 21 as an image control signal.
• the image analysis unit 24 controls the dimming element driver 25 based on the dimming control signal.
• the dimming driver 25 controls the dimming element 26.
• the dimming element driver 25 is illuminated by a light source 510 according to the presence or absence of expansion of the image signal supplied to each liquid crystal light valve 52 2, 5 2 3, 5 2 4 by the image processing section 21. Change the light intensity. This makes it possible to realize a smooth gradation expression while expanding the brightness range of the display image. According to the projection display device of the present embodiment, the dynamic range can be expanded and the image quality can be improved by the above operation.
• the dimming device driver 25 is configured to reduce the amount of illumination when the image signal supplied to each of the liquid crystal light valves 52 2, 52 3, and 52 4 is expanded. Control.
• the image processing unit 21 converts the RGB signal into HSV space or YuV space which is a color space.
• the image processing unit 21 performs predetermined image processing on the image signal (HSV space or YuV space) converted to the color space, and then performs inverse conversion of the color space to return to an RGB signal.
• the RGB signal inversely converted by the image processing unit 21 is input to the light valve driver 22 for each color light.
• the light valve driver 22 generates a lamp for each color light based on the inversely converted RGB signal. Control the valve 23.
• FIG. 3 is a block diagram showing a configuration of the image processing unit 21 when converting an image signal into an HSV space.
• the image processing unit 21 includes a decompression unit 31, an image signal conversion unit 32, a saturation correction unit 33, a saturation prediction unit 34, and a color information conversion unit 35.
• the decompression unit (decompression means) 31 performs decompression processing of the image signal according to the decompression coefficient supplied from the image analysis unit 24.
• the image signal conversion unit (image signal conversion means) 32 converts the decompressed RGB signal into the HSV space of the color space.
• the HSV space is a color space as shown in Fig. 4, where the H (Hue) signal represents the hue, the S (Saturation) signal represents the saturation (saturation), and the V (Va lue) signal represents the brightness. (Lightness).
• the memory Z sensor unit (detection means) 201 is provided on the light emitting side of the light valve 23.
• the memory / sensor unit 201 detects the amount of light leakage from the light valve 23 and records the detected amount of light leakage.
• the amount of light leakage here refers to the brightness on the screen when the image signal is set to 0. More specifically, although the amount of light from the light source 510 is blocked by the dimming element, each liquid crystal light valve This is the amount of light that leaks onto the screen even when all of 522, 523, and 524 are in a dark display.
• the amount of light leakage measured at the time of inspection before shipment may be stored by default. Also, the measurement may be performed when the power of the projection display device is turned on or when the projection display device is started up, and may be stored.
• the console unit (selecting means) 202 is where the user selects correction parameters such as increasing or decreasing the saturation correction to the saturation predicted by the saturation prediction unit 34.
• the saturation prediction section (prediction means) 34 predicts the saturation of the projected image signal based on the expansion coefficient supplied from the image analysis section 24 and the amount of light leakage supplied from the memory Z sensor section 201. .
• the saturation correction section (correction means) 33 performs a saturation correction of a vividness signal (S signal) in the HSV space based on the saturation prediction value predicted by the saturation prediction section 34.
• the color information conversion unit (color information conversion means) 35 performs an inverse conversion for returning the HSV space to the RGB signal.
• the saturation prediction unit 34 converts the image signal to which the light leakage amount 10 has been added into the HSV space, and predicts the saturation.
• the saturation is predicted to be 170, as shown in equation (2).
• the saturation predicting unit 34 predicts the saturation of the image signal when the expansion coefficient is double expansion.
• the image signal before decompression can be expressed as in equation (3), which is the same as equation (1) described above.
• Equation (5) By converting the image signal obtained by adding the amount of light leakage 10 to the image signal that has been expanded twice in Equation (4) to the HSV space and predicting the saturation, the result is as shown in Equation (5).
• the saturation when the image is expanded by a factor of 2 is predicted to be 185 as shown in equation (6).
• the saturation correction unit 33 performs saturation correction based on the values of the saturations (here, 170 and 185) predicted by the saturation prediction unit 34.
• Saturation correction either reduces the saturation of the color space to the expected saturation when not expanding, or increases it to the expected saturation when expanding.
• FIG. 5 is a block diagram showing a modification of the image processing unit 21 of FIG. Note that the same reference numerals are given to the same components as those in FIG.
• the expansion processing by the expansion unit 31 is configured to be performed only on the V signal converted by the image signal conversion unit 32.
• FIG. 6 is a block diagram showing a configuration of the image processing unit 21 when converting an image signal into a YuV space.
• the same components as those in FIG. 3 are denoted by the same reference numerals, and description thereof will not be repeated.
• the image processing unit 21 includes a decompression unit 31, an image signal conversion unit 320, a u signal correction unit 330, a V signal correction unit 331, a saturation prediction unit 34, A color information converter 350 is provided.
• the image signal converter 320 converts the decompressed RGB signal into a color space Yuv space.
• the conversion to the Yuv space is performed based on a conversion formula as shown in the following formula group A.
• the Y signal is brightness
• the u and V signals are chromaticity, which can represent saturation (brightness).
• the saturation predicting section 34 includes the expansion coefficient and memory / sensor supplied from the image analyzing section 24.
• the saturation of the projected image signal is predicted based on the amount of light leakage supplied from the unit 201.
• the u signal correction unit 330 performs saturation correction of the u signal, which is a signal of vividness, based on the saturation prediction value predicted by the saturation prediction unit 34.
• the V signal correction unit 331 performs the saturation correction of the V signal, which is a signal of vividness, based on the saturation predicted value predicted by the saturation prediction unit.
• the color information conversion unit 350 performs an inverse conversion that returns the Yuv space to an RGB signal.
• the saturation predicting unit 34 predicts the saturation of the image signal when the expansion coefficient is double expansion.
• the image signal before decompression can be expressed as in equation (9), which is the same as equation (7) described above.
• Equation (11) When the image signal obtained by adding the amount of light leakage 10 to the image signal that has been expanded by a factor of 2 in Equation (10) is converted to Yuv space, the result is as shown in Equation (11).
• Saturation correction either reduces the color saturation in the color space to the expected saturation when not expanding, or increases it to the expected saturation when expanding.
• FIG. 7 is a block diagram showing a modification of the image processing unit 21 of FIG. Note that the same components as those in FIG. 6 are denoted by the same reference numerals, and description thereof will be omitted as appropriate.
• the image processing unit 21 in FIG. 7 is configured such that the expansion processing by the expansion unit 31 is performed only on the Y signal in the Yu V space converted by the image signal conversion unit 320. As described above, since the decompression processing is performed only on the Y signal that is the brightness information, the circuit configuration can be reduced, and the processing can be sped up.
• FIG. 8 is a block diagram illustrating a configuration of a drive circuit of the projection display device according to the second embodiment.
• FIG. 9 is a block diagram illustrating a configuration of the image processing unit 21 according to the second embodiment in a case where an image signal is converted into an HSV space. Note that the same components as those of the image processing unit in FIG. 3 are denoted by the same reference numerals, and description thereof will be omitted as appropriate.
• the image processing unit 21 includes an offset processing unit 36, a decompression unit 31, an image signal conversion unit 32, a saturation correction unit 33, a saturation prediction unit 34, and a color information conversion unit. 3 and a configuration in which an offset processing unit 36 is added before the decompression unit 31 in FIG.
• the offset processing unit 36 performs an offset process on the image signal, that is, subtracts a predetermined subtraction amount (offset value) from the image signal based on the offset value supplied from the image analysis unit 24.
• the decompression unit 31 performs decompression processing on the image signal after the offset processing.
• the saturation prediction unit 34 calculates the saturation of the projected image signal based on the expansion coefficient and offset value supplied from the image analysis unit 24 and the amount of light leakage supplied from the memory sensor unit 201. Predict.
• the correction processing of the image processing unit 21 according to the second embodiment when converted to the HSV space will be described using specific numerical values.
• the saturation predicting unit 34 converts the image signal to which the amount of light leakage 10 has been added into the HSV space, and predicts the saturation.
• the saturation is predicted to be 170, as shown in equation (14).
• the saturation prediction section 34 predicts the saturation of the image signal when the expansion coefficient is doubled.
• the image signal before decompression can be expressed as in equation (15), which is similar to equation (13) described above. (13) Original signal
• Saturation correction either reduces the saturation of the color space to the expected saturation when not expanding, or increases it to the expected saturation when expanding.
• the offset processing is performed before the image signal is converted into the HSV space, and the saturation correction can be performed while suppressing the floating of black.
• FIG. 10 is a block diagram showing a modification of the image processing unit 21 of FIG. Note that the same components as those in FIG. 9 are denoted by the same reference numerals, and description thereof will be omitted as appropriate.
• the offset processing by the offset processing unit 36 and the expansion by the expansion unit 31 are performed only on the V signal that is the brightness information after conversion by the image signal conversion unit 32. It has such a configuration.
• the image processing unit 21 in FIG. 9 or FIG. 10 has a configuration in which the decompression unit 31 is provided after the offset processing unit 36, but is not limited thereto.
• the offset process may be performed on the RGB image signal after the decompression process or the V signal as the brightness information.
• FIG. 11 is a block diagram illustrating a configuration of the image processing unit 21 according to the second embodiment when converting an image signal into a Yuv space.
• the same components as those in FIGS. 6 and 9 are denoted by the same reference numerals, and description thereof will be omitted as appropriate.
• the image processing unit 21 includes an offset processing unit 36 and a decompression unit 31. 6, an image signal conversion unit 320, a u signal correction unit 330, a V signal correction unit 331, a saturation prediction unit 34, and a color information conversion unit 350, and an offset processing unit 36 before the decompression unit 31 in FIG. Has been added.
• the correction processing of the image processing unit 21 according to the second embodiment when converted to the Yuv space will be described using specific numerical values.
• Equation (20) a normal image signal is converted into a Yuv space based on [Formula Group A], as shown in Equation (20).
• Equation (21) when the image signal to which the amount of light leakage 10 is added is converted to the Yuv space based on [Formula Group A], it becomes as shown in Equation (21).
• the saturation predicting unit 34 predicts the saturation of the image signal when the expansion coefficient is double expansion.
• the image signal before decompression can be expressed as in equation (22), which is similar to equation (20) described above.
• Saturation correction either reduces the saturation of the color space to the expected saturation when not expanding, or increases the saturation to the expected saturation when expanding.
• the offset processing is performed before the image signal is converted into the YuV space, and the saturation correction can be performed while suppressing the floating of black.
• FIG. 12 is a block diagram showing a modification of the image processing unit 21 of FIG. Note that the same components as those in FIG. 11 are denoted by the same reference numerals, and description thereof will be omitted as appropriate.
• the offset processing by the offset processing unit 36 and the expansion by the expansion unit 31 are performed only on the Y signal, which is the brightness information converted by the image signal conversion unit 32. It is a configuration that can be performed.
• the image processing unit 21 in FIG. 11 or FIG. 12 has a configuration in which the decompression unit 31 is provided after the offset processing unit 36, but is not limited thereto.
• the offset process may be performed on the RGB image signal after the decompression process or the Y signal as the brightness information.
• FIG. 13 is a block diagram illustrating a configuration of the image processing unit 21 according to the third embodiment.
• the image processing unit 21 includes operation units 370, 371, and 372 that perform color correction of the R, G, and B signals.
• the image processing unit 21 of the third embodiment does not perform the color space conversion of the image signal as in the first or second embodiment, and the color correction of each of the RGB colors is directly calculated by the calculation units 370, 371, and 372. It is supposed to do.
• a calculation formula performed by the calculation units 370, 371, and 372 of the image processing unit 21 according to the third embodiment will be described.
• the amount of light leakage is V
• the offset value (offset amount) V The case will be described.
• the calculation units 370, 371, and 372 when performing the correction operation for reducing the vividness, the calculation units 370, 371, and 372
• the signal expanded so that controls bl '.
• the calculation units 370, 371, and 372 similarly perform
• the image processing unit 21 performs color correction by direct calculation based on a predetermined calculation formula without performing color space conversion on the RGB image signal.
• the processing can be speeded up.
• FIG. 14 is a block diagram illustrating a configuration of a drive circuit of the projection display device according to the fourth embodiment.
• the drive circuit according to the fourth embodiment includes an image analysis unit 24 and an image processing unit 21.
• the expansion coefficient is supplied as a conversion table.
• the image processing unit 21 calculates the offset value and the main expansion coefficient from the expansion coefficient given by the conversion table as shown in FIG. 15, and calculates these values. It predicts vividness (saturation) from the value and the amount of light leakage. Note that the horizontal axis of the conversion table in FIG. 15 represents the input image signal, and the vertical axis represents the converted image signal.
• FIG. 16 is a block diagram showing the configuration of the image processing unit 21 according to the fourth embodiment when using a conversion table.
• the image processing unit 21 includes conversion processing units 380, 381, 382 for performing conversion and decompression based on a conversion table, correction calculation units 3701, 371 1, 37 21, and a coefficient separation unit 39. .
• the conversion processing unit 380 performs offset processing and decompression processing on the R signal of the image signal based on the conversion table (LUT; lookup table) supplied from the image analysis unit 24. Similarly, the conversion processing unit 381 performs offset processing and decompression processing on the G signal of the image signal. The conversion processing unit 382 performs offset processing and decompression processing on the B signal.
• the coefficient separation section 39 separates the expansion coefficient and the offset value from the conversion table supplied from the image analysis section 24, and supplies them to the correction operation sections 3701, 3711, and 3721 for the RGB signals.
• the correction operation unit 3701 is based on the offset value and the expansion coefficient supplied from the conversion processing unit 380, the expansion coefficient and the offset value supplied from the coefficient separation unit 39, and the light leakage amount supplied from the memory / sensor unit 201. Performs saturation correction of the R signal.
• the saturation correction by the correction calculation unit 3701 is performed based on the predetermined calculation formula described in the third embodiment.
• the correction operation unit 3711 performs the saturation correction of the G signal
• the correction operation unit 3721 performs the saturation correction of the B signal.
• FIG. 17 is a block diagram illustrating a configuration of the image processing unit 21 according to the fourth embodiment in the case where the image is converted into the HSV space.
• the same components as those in the first, second, or third embodiment are denoted by the same reference numerals, and description thereof will not be repeated.
• the image processing unit 21 performs conversion and decompression based on the conversion table. It includes a conversion processing unit 37, an image signal conversion unit 32, a saturation correction unit 33, a saturation prediction unit 34, a color information conversion unit 35, and a coefficient separation unit 39.
• the conversion processing unit 37 performs an expansion process and an offset process on the input image signal based on the conversion table supplied from the image analysis unit 24.
• the image signal conversion unit 21 converts the image signal on which the expansion processing and the offset processing have been performed by the conversion processing unit 37 into an HSV space of a color space.
• the coefficient separation unit 39 supplies the expansion coefficient and the offset value separated from the conversion table supplied from the image analysis unit 24 to the saturation prediction unit 34.
• the saturation prediction unit 34 calculates the saturation of the projected image signal based on the expansion coefficient and offset value supplied from the coefficient separation unit 39 and the amount of light leakage supplied from the memory Z sensor unit 201. Predict.
• FIG. 18 is a block diagram showing a modification of the image processing section 21 of FIG. Note that the same components as those in FIG. 17 are denoted by the same reference numerals, and description thereof will be omitted as appropriate.
• the offset processing and the decompression processing by the conversion processing unit 37 based on the conversion table are the brightness information after conversion by the image signal conversion unit 32.
• the configuration is such that it is performed only for signals.
• the circuit configuration can be reduced, and the processing can be speeded up.
• FIG. 19 is a block diagram showing a configuration of a drive circuit when an encoded image signal is input. Note that the same components as those of the drive circuit in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted as appropriate.
• the drive circuit of FIG. 19 further includes a decoder 27 for decoding the encoded image signal in addition to the drive circuit of FIG.
• the decoder decodes the encoded signal and supplies the decoded image signal to the image processing unit 21.
• FIG. 20 is a diagram showing a modified example of the drive circuit of FIG.
• the same components as those in FIG. 19 are denoted by the same reference numerals, and description thereof will not be repeated.
• the decoder 27 decodes an image signal on which predetermined image processing has been performed by the image processing unit 21. That is, an encoded image signal is input to the image processing unit 21.
• the image processing unit 21 in FIG. 20 can have the configuration described in the first to fourth embodiments and the modifications of each embodiment.
• the user can select whether to increase or decrease the saturation in the console section 202 as the selection of the correction parameter overnight, but the present invention is not limited to this.
• the user may be able to arbitrarily set the saturation to be intermediate between the values predicted by the saturation prediction unit 34.
• the image display method and the image display program of the present invention have been described using a projection display device as an image display device that can use a computer-readable recording medium on which the image display program is recorded.
• the present invention is not limited to this, and may be, for example, a direct-view display device.
• the recording medium on which the image display method and the image display program of the present invention are recorded and which can be read overnight can be used for processing image signals such as LCDs, electoran luminescence, plasma displays, digital mirror devices, and field emission devices. Can also be used. Industrial applicability
• image signals of a plurality of expanded basic colors are converted into color information including saturation and lightness, and after correcting the saturation, the color information is converted into image signals of a plurality of basic colors. Since the inverse conversion is performed, the dynamic range of the display image can be changed without changing the ratio of the image signals of the plurality of basic colors.

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• Liquid Crystal Display Device Control (AREA)
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• 2002
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