WO2014075565A1 - 调整方法、调整装置、光机和屏幕拼墙系统 - Google Patents

调整方法、调整装置、光机和屏幕拼墙系统 Download PDF

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Publication number
WO2014075565A1
WO2014075565A1 PCT/CN2013/086479 CN2013086479W WO2014075565A1 WO 2014075565 A1 WO2014075565 A1 WO 2014075565A1 CN 2013086479 W CN2013086479 W CN 2013086479W WO 2014075565 A1 WO2014075565 A1 WO 2014075565A1
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WIPO (PCT)
Prior art keywords
image signal
light
adjacent area
adjustment
area
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PCT/CN2013/086479
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English (en)
French (fr)
Inventor
李屹
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Shenzhen Appotronics Corp Ltd
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Appotronics Corp Ltd
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Publication of WO2014075565A1 publication Critical patent/WO2014075565A1/zh
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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]
    • H04N9/3141—Constructional details thereof
    • H04N9/3147—Multi-projection systems
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
    • G06F3/1423—Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display
    • G06F3/1446—Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display display composed of modules, e.g. video walls
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/02—Composition of display devices
    • G09G2300/026—Video wall, i.e. juxtaposition of a plurality of screens to create a display screen of bigger dimensions
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen

Definitions

  • the present invention relates to the field of projection display, and more particularly to an adjustment method, an adjustment device, a optomechanical machine and a screen wall system. Background technique
  • the current solution is: Given an image signal with a uniform brightness and color (such as a pure white image or a pure red image), the brightness of the calibration screen is Hook distribution, find the darkest area, and then reduce the brightness level of other areas to achieve the brightness of the darkest area by processing the image signal or processing the light source to achieve uniform brightness of the entire screen.
  • a uniform brightness and color such as a pure white image or a pure red image
  • Both the hook and the gradation referred to in the present invention refer to the evaluation of the displayed image signal under the condition that the image signal is input.
  • the technical problem solved by the invention is that, under the premise of ensuring a good display effect, it is minimized The screen brightness of the screen is reduced.
  • the invention provides an adjustment method, which is applied to a screen wall, which is closely spliced together by at least two screen display units, and the adjustment method comprises:
  • the adjacent area covers all seams of the screen wall, and the light adjustment coefficient causes the image of the adjacent area to display a uniform response to the input signal or a gradient that does not cause a sudden change Respond
  • the new light source drives the parameters so that the screen wall drives the light source for display with the new light source drive parameters.
  • the invention also provides an adjustment method, which is applied to a screen wall, which is closely spliced together by at least two screen display units, and the screen wall can display at least three primary colors, a first primary light, and a second
  • the primary color light and the third primary color light include the following steps:
  • the application adjusts the uniformity of the third primary color light according to the above adjustment method.
  • the invention also provides an adjusting device, which is applied to a screen wall, which is closely spliced together by at least two screen display units, and the adjusting device comprises:
  • a first obtaining module configured to acquire a light adjustment coefficient of each position in the predetermined adjacent area, the adjacent area covers all seams of the screen wall, and the light adjustment coefficient causes the image of the adjacent area to display a uniform response to the input signal or not a gradual response that causes a sense of mutation;
  • a second acquiring module configured to acquire an input image signal of the screen wall
  • the adjustment module is configured to adjust the input image signal by using the light adjustment coefficient to obtain a new input image signal, so that the screen wall is displayed by the new input image signal; or for using the light adjustment coefficient pair according to the input image signal
  • the light source driving parameters are adjusted to obtain new light source driving parameters, so that the screen wall drives the light source to display with the new light source driving parameter.
  • the invention also proposes an optical machine for a screen wall comprising the above-mentioned adjusting device.
  • the invention also provides a screen wall system, comprising a screen wall, the screen wall is closely spliced together by at least two display units, and the system further comprises the above-mentioned adjusting device.
  • Figure 1 is a schematic view showing the assembly structure of a 2 x 2 screen wall
  • Figure 2 is a schematic view of a first embodiment of the present invention
  • FIG. 3 is a schematic diagram showing the division of adjacent regions and non-contiguous regions in a single display unit
  • FIG. 4 is a schematic diagram of a buffer after adding a buffer in the first embodiment of the present invention.
  • FIG. 5 is a schematic diagram of adjusting a luminance response of a neighboring region to a slow gradation by curve fitting
  • FIG. 6 is a schematic view of a second embodiment of the present invention
  • Figure 7 is a schematic view of a third embodiment of the present invention.
  • Figure 1 is a schematic diagram of a 2 X 2 screen wall, which is made up of four display units of &, b, c, and d.
  • the display unit can be a projection screen, an LED display, an LCD display, and the like.
  • the brightness of the four display units a, b, c, and d will be inconsistent. This inconsistency will cause a sudden change in the brightness of the screened wall at the seam, which affects the overall display effect of the wall.
  • the darkest area is found from the entire wall, and then the brightness of the entire screen is adjusted to be the same as the area to ensure the uniformity of the brightness of the entire wall, the brightness of the displayed image will undoubtedly be greatly reduced.
  • a commonly used method for adjusting the brightness response of the adjacent area of the screen to a uniform response or a gradual response is: calibrating the light adjustment coefficient of each position in the adjacent area, and adjusting the brightness of the adjacent area according to the light adjustment coefficient to be a uniform response or not Will cause sudden A gradual response to the sensation.
  • the gradual response described here without causing a sense of mutation means that the degree of change is slow and does not cause human perception, and the degree of such change is difficult to quantitatively describe, but can be obtained in practice by an experiment viewed by the human eye.
  • Figure 2 is a schematic view of a first embodiment of the present invention.
  • the method for adjusting the uniformity of the screen wall includes the following steps 101-103:
  • Step 101 acquires a light adjustment coefficient for each position in the predetermined adjacent area, and the adjacent area covers all seams of the screen wall, and the light adjustment coefficient causes the image of the adjacent area to display a uniform response to the input signal or does not cause a sudden change. Gradient response.
  • the adjacent regions are first explained below.
  • a 2 x 2 screen wall it has a cross-shaped seam defining its adjoining area as a cross-shaped area 21 covering all the seams and having a width distributed along both sides of the seam. If the wall is disassembled, the defined adjacent areas will be distributed at the edge of each display unit. Taking the a display unit in Fig. 2 as an example, its adjacent areas are distributed on the right and bottom edges.
  • the boundary of the adjacent area may be a straight line or an irregular curve, as long as the adjacent area covers all the seams of the wall and has a certain width along both sides of the seam, as shown in FIG. 3 is a schematic view showing the division of the adjacent region and the non-contiguous region in the cell of FIG.
  • the boundary between the adjacent area and the non-contiguous area is a curve, which can reduce the sensitivity of the human eye to the difference in brightness between the two, so that the visual effect is better.
  • the width of the adjacent region refers to: If the adjacent region is distributed at the edge of a certain edge in the display unit, the distance extending from the point on the edge of the edge to the inside of the display unit is the width of the adjacent region at the point. Obviously, for the adjacent regions of the curve boundary, the width distribution of the adjacent regions is different. In practice, the width of the adjacent area can be flexibly selected as needed. Preferably, the width does not exceed 1/5 of the length of the side to which the width belongs in the display unit in which it is located.
  • the edge to which the width belongs refers to the edge of the display unit that is parallel to the width.
  • the long side of the display unit is the edge to which the width of the adjacent region belongs; conversely, when the adjacent region When distributed along the long edge of the display unit, the short side of the display unit is the side to which the width of the adjacent area belongs.
  • the edge to which the width of the adjacent region 211 belongs is the long side L
  • the side to which the width of the adjacent region 212 belongs is the short side 1 ⁇ .
  • the remaining portion of the display unit after the contiguous area is removed is defined as a non-contiguous area.
  • the seam is composed of a plurality of horizontal and vertical intersecting lines, and the adjacent area defined at this time also covers all the seams of the wall and along both sides of the seam.
  • the adjacent area There is a certain width distribution.
  • its internal contiguous area is always distributed at its edges. Make the width of the adjacent area not exceed 1/5 of the side length of the edge to which it belongs, and ensure that the area of all adjacent areas only accounts for a small portion of the entire screen wall area, so that when the brightness in the adjacent area is adjusted, the entire screen Only a small portion of the wall in the wall is dimmed, and the overall brightness is still high.
  • the light adjustment coefficients for each position in the adjacent area are then calibrated.
  • the actual image displayed on the screen wall will be different from the input image signal, that is, the different positions of the screen wall will respond differently to the input image signal; the so-called light adjustment coefficient is used to display the actual image.
  • the image is adjusted to the same calibration factor as the desired image signal. For example, if a local over-brightness is required, the luminance value of the local image signal is multiplied by a calibration coefficient less than one or divided by a calibration coefficient greater than one to lower the luminance value of the image signal, and the image signal is displayed on the screen.
  • the calibrated light adjustment factor can be stored in a non-erasable memory in the control panel of the screen wall and can be read at any time.
  • the calibration process of the adjacent area light adjustment coefficient may include the following steps:
  • the area light adjustment factor, where the element is located is defined as the reference brightness area.
  • the image signal of the adjacent area is first divided by the light adjustment coefficient and then output to the screen display, so that the response to the input image signal is uniform, and the reference brightness area is maintained.
  • the response of the domain is unchanged. That is to say, each time an image is input, the image signal of the adjacent area is first divided by the light adjustment coefficient and then output to the screen display, so that the actual display image of the adjacent area is adjusted to be adjacent to the input image signal.
  • the brightness distribution is the same, while ensuring that the brightness of the selected reference brightness area does not change.
  • the average of the smallest element or the smaller neighboring elements in the matrix n can be selected as a reference, and the selected reference luminance region is the relative region in the adjacent region.
  • the advantage of this selection is:
  • the value of each element in the normalized matrix N ie, the adjacent area light adjustment coefficient
  • N the adjacent area light adjustment coefficient
  • the selected reference luminance region is not the region with the lowest luminance relative to the specific image signal in the adjacent region, and the normalized matrix N will appear less than 1
  • the value of the element For areas corresponding to values less than 1, if the input image signal value is large, the result obtained by dividing the light adjustment factor may exceed the maximum brightness that can be displayed by the wall and cannot be displayed.
  • One way of processing is to display the maximum brightness value over the maximum brightness value. Although the gray level of the display image is sacrificed, the adjacent area is further improved relative to the normalization of the smallest element in n. The brightness of the image.
  • n normalizes n by selecting a specific element from the matrix n as a reference, and correspondingly selecting a specific luminance region from the adjacent regions as the reference luminance region to determine the optical adjustment coefficient of the adjacent region.
  • an optical adjustment coefficient is used to adjust the image brightness of each position in the adjacent area, the brightness of some areas may be increased, and the brightness of some areas may be lowered.
  • the brightness value corresponding to the area where the element is located will be increased.
  • the brightness value corresponding to the area will be lowered.
  • the display can be directly output, but when the brightness is increased, it may exceed the maximum threshold that the wall can display. Similarly, the brightness exceeding the maximum threshold can be output as the maximum brightness value. The advantage of this is that you don't have to look for the reference brightness area.
  • the value can be flexibly adjusted according to actual needs: when the value is selected to be large, the luminance loss is small, and the gray scale is sacrificed; if the value is selected to be small, the luminance loss is large, but the gray scale sacrifice is small.
  • the image signal of the adjacent area is simply multiplied by the light adjustment coefficient and then outputted, so that the brightness of the actually displayed image is adjusted to and the input image.
  • the signal has the same luminance distribution in the adjacent region while ensuring that the brightness of the selected reference luminance region does not change.
  • the selection of the reference elements in n that is, the selection of the reference luminance region in the adjacent region
  • selecting the largest element from n corresponds to selecting the smallest element in n in the foregoing scheme, and selecting the smallest element from n is equivalent.
  • the largest element is selected in n, and of course, a certain brightness value may also be selected, and details are not described herein again.
  • the above two methods for calculating the optical adjustment coefficient of the adjacent region are the simplest and most optimal methods.
  • the image signal input in the adjacent region is simply multiplied or divided by the optical adjustment coefficient and then output.
  • the calculation method of the light adjustment coefficient is far more than the above two, and it can take a more flexible public
  • This inverse formula is a formula used to adjust the input image signal and is defined as an adjustment formula.
  • the brightness distribution of the image displayed in the adjacent area can be adjusted to be adjacent to the input image signal by using the calculated light adjustment coefficient and the corresponding adjustment formula.
  • the brightness distribution is the same.
  • the sub-matrix n is subjected to two-dimensional discrete Fourier transform to obtain its spectral distribution, and then the high-frequency components in the spectrum are filtered out. Finally, the filtered spectrum is subjected to inverse Fourier transform to obtain a new matrix N, which will be n and N.
  • the respective pixels are divided to obtain the light adjustment coefficient for each position sought. By using the light adjustment coefficient, it is only necessary to divide the image signal of the adjacent area by the light adjustment coefficient to make the response of the adjacent area image display to the input signal a gradual response.
  • the advantage of this method is that the response of the adjusted adjacent area image does not become an absolute uniform response, but becomes a gradual response according to the trend of the original response, and the adjustment is small without affecting the display effect. The brightness sacrifice is also small.
  • the value of some elements may be less than 1.
  • the input image signal is adjusted to become larger, that is, corresponding to the display brightness. Will improve.
  • the result obtained by dividing the light adjustment factor may exceed the maximum threshold that the wall can display and cannot be displayed.
  • the brightness value of the threshold is displayed at the maximum brightness value, which increases the brightness of the image while sacrificing a certain gray level of the displayed image.
  • Another way to deal with the following is to add an equal amount to each element in the matrix of optical adjustment coefficients to ensure that the value of each element is not less than 1, which ensures that the brightness of the input image signal is reduced after adjustment. , so always output display of.
  • the corresponding high-frequency filtering processing can also be used to obtain corresponding light adjustment coefficients, and these light adjustment coefficients can also achieve the effect of slowly varying the luminance response of the adjacent regions. Only when the calculated light adjustment coefficient is used to adjust the brightness of the adjacent area, it is calculated according to the adjustment formula corresponding to the light adjustment coefficient. Although the above method is to adjust the brightness of the adjacent area slowly, the adjustment of the brightness of the buffer can also be handled in the same way.
  • the specific image signal p is a uniform image signal, which can reduce the amount of calculation.
  • the luminance response curve may be smoothed by curve fitting without passing through the spectral filtering, which is illustrated by taking FIG. 5 as an example.
  • the discrete point column 51 is the brightness response of the image displayed in the adjacent area after the input of the uniform image
  • the curve 52 is the curve after fitting the discrete point column
  • the curve 53 is the whole curve 52.
  • the downwardly shifted curve, line 54 is the horizontal line drawn by the lowest brightness value in discrete point 51. Curve fitting of discrete points has no fixed mathematical form.
  • the fitted curve is the adjusted brightness response.
  • the fitted curve should be shifted downwards as a whole to ensure that the translated curve is below all discrete points, as shown in Figure 5.
  • Curve 53 is shown.
  • the adjustment of curve 53 relative to the original discrete luminance value is the corresponding optical adjustment factor.
  • the overall brightness corresponding to curve 53 is obviously higher than the straight line 54, so this method of adjusting the brightness of the adjacent area to a slow gradual response by fitting the curve adjusts the brightness of the adjacent area with respect to the lowest brightness value of the adjacent area as a standard.
  • Step 102 Acquire an input image signal of the screen wall. After the image signal is obtained from the outside, the frame data of the image signal is stored in the memory, and subsequent calculation processing is prepared.
  • Step 103 adjusting the input image signal by using the light adjustment coefficient to obtain a new input image signal, so that the screen wall is displayed by the new input image signal; or using light
  • the adjustment coefficient adjusts the light source driving parameters obtained according to the input image signal to obtain a new light source driving parameter, so that the screen wall drives the light source to display with the new light source driving parameter.
  • the brightness of the image displayed in the adjacent area is adjusted according to the light adjustment coefficient, and the adjustment manner includes adjustment of the image signal and adjustment of the light source.
  • the image signal is first multiplied by the light adjustment coefficient matrix N, and then the calculation result is output and displayed.
  • This technology requires a high speed image processing chip to process each frame of image in real time in a fast, costly manner.
  • the adjustment of the light source is to adjust the output power of different positions of the light source according to the light adjustment coefficient.
  • this adjustment is to adjust the driving power of the light source, including adjusting the current or voltage of the driving power source, and the adjustment method is similar to the adjustment of the image signal: For example, if the calculated light adjustment coefficient is N, the image signal is used for image signal When adjusting, we need to multiply each input image p by N and then output the display. Then, corresponding to the adjustment of the light source, we need to drive the current value of the image signal (corresponding to each frame image signal, Pre-establishing a mapping table of image signal strength and driving current value to obtain a driving current value for each position according to the mapping table and each frame image.
  • the brightness adjustment of the adjacent area can be uniformly adjusted by using the above-mentioned adjacent area light adjustment coefficient and the adjustment method, but a sudden change in brightness may occur between the adjacent area and the non-contiguous area.
  • the solution is to include the following steps 104 and 105. :
  • Step 104 Acquire an optical adjustment coefficient of each position in the predetermined buffer, and the buffer is located adjacent to Between the connection area and the non-adjustment area where the adjustment method is not adjusted, the light adjustment coefficient of the buffer causes the image of the buffer to display a response to the input signal as a gradual response that does not cause a sudden change, so that the buffer is There is no sudden change in the brightness of the position of the boundary of the adjacent area and the position of the boundary between the buffer and the non-adjusted area.
  • the non-adjusted area is located at the center of the screen wall unit and generally occupies the main display area of the screen wall unit.
  • the buffer is set as shown in Fig. 4, 41 is a cross-shaped adjacent area, 42a, 42b, 42c, 42d are buffers, and when the brightness of the adjacent area is much lower than that of the surrounding non-contiguous area, the buffer passes through In the transition, a slow gradual change in brightness can be achieved without abrupt changes, and 43 is the brightness change curve of the entire splicing wall.
  • the width of the buffer is flexibly selected according to the actual situation. According to common sense, when the brightness of the adjacent area and the non-contiguous area is abruptly changed, the buffer width should be selected to be larger, so that the brightness transition is as gentle as possible; otherwise, when the adjacent area and the non-contiguous area When the brightness of the adjacent area is small, the width of the adjacent area can be selected to be smaller. Since the brightness of the boundary between the adjacent and non-contiguous areas is usually different inside different display units, the width of the buffer is also different.
  • the buffer brightness response can be set to a linear gradient along the width, and of course there can be other gradations, as long as the degree of gradation does not cause a visual abrupt change.
  • Step 1 04 is close to the steps completed in step 1 01, and can also be combined in one step.
  • Step 1 05 adjusts the input image signal by using the light adjustment coefficient of the buffer to obtain a new input image signal, so that the screen wall is displayed with the new input image signal; or the light adjustment coefficient pair of the buffer is used.
  • the light source driving parameters obtained by inputting the image signal are adjusted to obtain new light source driving parameters, so that the screen wall drives the light source to display with the new light source driving parameter.
  • Step 1 05 is similar to the action taken in step 1 03, and can also be combined in one step. It should be understood that the buffer is unnecessary when the brightness of the adjacent area is not sufficiently different from the brightness of the non-contiguous area to cause the human eye to perceive.
  • the present invention does not reduce the brightness of the entire screen wall to ensure the uniformity of the brightness of the screen when adjusting the brightness uniformity of the screen wall, but by setting the adjacent area, only in Adjusting the brightness in the adjacent area or the adjacent area and the buffer to achieve a uniform response of the local brightness or a gradual response that does not cause a sudden change, and at the same time, since the brightness of the non-contiguous area occupying most of the entire screen is not adjusted, In the prior art, the brightness of the entire wall With a substantial increase, the stitching display is good.
  • FIG. 6 is a schematic view of a second embodiment of the present invention.
  • the adjacent area 61 is defined as the surrounding area of each display unit, and the width of each adjacent area is still selected according to the actual situation.
  • the width of each adjacent area does not exceed its own Display 1/5 of the side length of the unit.
  • the advantage of the adjacent area thus defined is that the brightness of all adjacent areas can be adjusted to a uniform suitable value before the splicing of the screen wall to ensure that the different display units are spliced and the sides of the joint are spliced.
  • the brightness is uniform, so that the brightness of the joint wall can be ensured without the adjustment of the brightness of the adjacent area.
  • the predefined appropriate brightness value can be selected according to the actual situation.
  • the brightness of the adjacent area around each display unit can be Uniform adjustment to 80% of the highest brightness value ensures that the adjustment of the critical area brightness is always achievable for each display unit.
  • a buffer may be further disposed between the adjacent region and the non-contiguous region, and the brightness response in the buffer gradually changes gradually with the position, and is ensured.
  • the setting of the buffer width and how to adjust the brightness to a slow gradation are the same as in the first embodiment, and are not described here.
  • each display unit in the second embodiment defines the brightness of the adjacent area and the adjacent area after the production, it is not necessary to determine the adjacent area and subsequent image processing after the splicing wall is determined, which can be realized simply and conveniently.
  • the expansion of the splicing screen greatly facilitates the use of the customer.
  • Figure 7 is a schematic view of a third embodiment of the present invention.
  • the area of the adjacent area is large or the brightness of the adjacent area changes greatly, if the brightness of the entire adjacent area is still adjusted to be the same as the brightness of the inner minimum brightness area, it may still be The entire splicing wall loses a large brightness. At this time, as shown in FIG.
  • the adjacent area is further divided into a plurality of sub-contiguous areas along the extending direction of the edge of the associated display unit, and then each sub-adjacent area is used as an independent
  • the brightness is adjusted as a whole, and the light adjustment coefficient of each sub-adjacent area makes the sub-adjacent
  • the image of the zone shows a gradual response that responds to the input signal with a uniform response or does not cause a sudden change in sensitivity.
  • a buffer may be further disposed adjacent to the adjacent sub-contiguous regions, or the brightness of the adjacent blocks may be gradually gradually changed by spectral filtering. How to set the buffer at the abutment and how to adjust the brightness to achieve uniform brightness or slow gradation has been described in the previous embodiment and will not be described here.
  • Brightness adjustment can be performed individually for each block by further subdivision of the entire adjacent area.
  • the advantage of this is that if the darkest area of the entire adjacent area appears in one of the blocks, the brightness of the other blocks does not need to be adjusted to the brightness of the darkest area in the entire adjacent area, but only needs to be adjusted to its own The brightness of the darkest area within the block. This undoubtedly further increases the display brightness.
  • the above only introduces the adjustment method of the brightness uniformity of the 1 X 2 screen wall.
  • the adjustment of the color uniformity it is only necessary to apply the above method to adjust the brightness of each primary color image of the screen wall evenly to ensure the final color.
  • Uniformity The primary color image may be a red, green, blue three primary color image, or may be a three primary color image of other colors. In short, as long as the brightness of each monochrome image is uniform, the final color is uniform.
  • the invention also provides an adjusting device, which is applied to a screen wall, and the screen wall is closely spliced together by at least two screen display units, and the adjusting device comprises:
  • a first obtaining module configured to acquire a light adjustment coefficient of each position in the predetermined adjacent area, the adjacent area covers all seams of the screen wall, and the light adjustment coefficient causes the image of the adjacent area to display a uniform response to the input signal or not a gradual response that causes a sense of mutation;
  • a second acquiring module configured to acquire an input image signal of the screen wall
  • the adjustment module is configured to adjust the input image signal by using the light adjustment coefficient to obtain a new input image signal, so that the screen wall is displayed by the new input image signal; or for using the light adjustment coefficient pair according to the input image signal
  • the light source driving parameters are adjusted to obtain new light source driving parameters, so that the screen wall drives the light source to display with the new light source driving parameter.
  • the function of the first obtaining module corresponds to the foregoing step 101
  • the function of the second acquiring module corresponds to the foregoing step 102
  • the function of the adjusting module corresponds to the foregoing step 103, which is not described in detail herein.
  • the adjusting apparatus may further include a third acquiring module, configured to acquire an optical adjustment coefficient of each position in the predetermined buffer, where the buffer is located in the adjacent area and the adjustment The entire method does not adjust between the non-adjustment areas, and the light adjustment coefficient of the buffer causes the image of the buffer to display a response to the input signal as a gradual response that does not cause a sudden change, so that the buffer is bordered by the adjacent area. There is no sudden change in the position of the position and the boundary between the buffer and the non-adjusted area.
  • the third obtaining module can be the same module as the first acquiring module.
  • the adjustment module is further configured to adjust the input image signal by using the light adjustment coefficient of the buffer to obtain a new input image signal, so that the screen wall is displayed by the new input image signal; or
  • the light adjustment coefficient of the buffer adjusts the light source driving parameters obtained according to the input image signal to obtain a new light source driving parameter, so that the screen wall drives the light source to display with the new light source driving parameter.
  • the invention also proposes an optical machine for screen wall.
  • the optical machine includes a light source device, a light modulation device, a projection optical system, and the above-described adjustment device.
  • the adjusting device not only has the functions mentioned in the above embodiments, but also is used for transmitting the adjusted new input image signal to the light modulating device; the light modulating device sends the light source device according to the image signal sent by the adjusting device. Light is modulated to form image light.
  • the adjusting device is further configured to send the adjusted new light source driving parameter to the light source device; the light source device emits light according to the light source driving parameter sent by the adjusting device, and the light modulating device modulates the light emitted by the light source device to form the image light. .
  • the image light is projected through the projection optical system to form an image on the screen.
  • the present invention also provides a screen wall system comprising a screen wall that is closely spliced together by at least two display units that use the adjustment means described above to produce a uniform or gradual response to the image signal.

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Abstract

本发明提出一种调整方法、调整装置、光机和屏幕拼墙系统，用于屏幕拼墙，该屏幕拼墙由至少两个显示单元拼接而成，通过获取预定邻接区内每个位置的光调整系数和获取屏幕拼墙的输入图像信号，并采用光调整系数对输入图像信号进行调整得到新的输入图像信号，以便于屏幕拼墙以该新的输入图像信号进行显示，实现了邻接区的亮度和颜色分布为均匀响应或不会引起突变感的渐变响应，同时非邻接区内的亮度和颜色不变，这可保证屏幕拼墙具有良好的拼接显示效果的同时，具有较高亮度。

Description

调整方法、 调整装置、 光机和屏幕拼墙系统 技术领域
本发明涉及投影显示领域， 特别涉及一种调整方法、 调整装置、 光 机和屏幕拼墙系统。 背景技术
随着投影显示技术的发展， 大屏幕显示越发为人们所青睐。 无论用 于投影显示的投影屏， 还是液晶显示屏或 LED显示屏， 为了实现大屏幕 的显示， 通常需要将两个以上的显示单元进行拼接。 将多个显示单元拼 接时， 由于各显示单元之间的差异， 在相邻两显示单元的接缝处， 会存 在亮度和颜色的突变， 影响整体视觉效果。
为了使拼接后的屏幕拼墙在整体上亮度尽可能均匀， 目前的解决方 案是： 给定一幅均勾亮度和颜色的图像信号（比如纯白色图像或纯红色 图像）， 标定屏幕的亮度均勾性分布， 找到其中最暗的区域， 然后通过 对图像信号的处理或者对光源的处理， 降低其它区域的亮度水平使其达 到最暗的区域的亮度， 以实现整个屏幕的亮度均匀。
显而易见， 这种方法的问题是显示亮度的下降。 而且， 当这种方法 应用于屏幕拼墙时， 每一个显示单元的亮度都必须以所有单元中最暗的 区域作为基准来调整， 才能实现整个拼墙的亮度和颜色相同。 拼墙所用 的显示单元越多， 则亮度下降的可能性越大。 发明内容
经过深入思考我们发现， 对于屏幕拼墙来说， 并不需要将所有显示 单元的亮度和颜色都调节到相同， 而只要保证相邻显示单元在接缝处的 亮度和颜色均勾或緩慢渐变即可保证整个拼墙的显示效果。 本发明所指 的均勾和渐变， 都是指在输入均勾图像信号的条件下对所显示的图像信 号的评价。
本发明解决的技术问题是， 在保证良好显示效果的前提下， 尽量减 少屏幕拼墙亮度的下降。
本发明提出一种调整方法， 应用于屏幕拼墙， 该屏幕拼墙由至少两 个屏幕显示单元紧密拼接在一起， 该调整方法包括：
获取预定邻接区内每个位置的光调整系数， 该邻接区覆盖屏幕拼墙 的所有接缝， 光调整系数使邻接区的图像显示对于输入信号的响应为均 匀响应或不会引起突变感的渐变响应；
获取屏幕拼墙的输入图像信号；
采用光调整系数对输入图像信号进行调整得到新的输入图像信号 , 以便于屏幕拼墙以该新的输入图像信号进行显示； 或采用光调整系数对 根据输入图像信号得到的光源驱动参数进行调整得到新的光源驱动参 数， 以便于屏幕拼墙以该新的光源驱动参数驱动光源进行显示。
本发明还提出一种调整方法， 应用于屏幕拼墙， 该屏幕拼墙由至少 两个屏幕显示单元紧密拼接在一起， 且屏幕拼墙可以显示至少三种基色 光， 第一基色光， 第二基色光和第三基色光， 包括以下步骤：
应用根据上述的调整方法调整第一基色光的均匀性；
应用根据上述的调整方法调整第二基色光的均匀性；
应用根据上述的调整方法调整第三基色光的均匀性。
本发明还提出一种调整装置， 应用于屏幕拼墙， 该屏幕拼墙由至少 两个屏幕显示单元紧密拼接在一起， 该调整装置包括：
第一获取模块， 用于获取预定邻接区内每个位置的光调整系数， 邻 接区覆盖屏幕拼墙的所有接缝， 光调整系数使邻接区的图像显示对于输 入信号的响应为均匀响应或不会引起突变感的渐变响应；
第二获取模块， 用于获取屏幕拼墙的输入图像信号；
调整模块， 用于采用光调整系数对输入图像信号进行调整得到新的 输入图像信号， 以便于屏幕拼墙以该新的输入图像信号进行显示； 或用 于采用光调整系数对根据输入图像信号得到的光源驱动参数进行调整 得到新的光源驱动参数， 以便于屏幕拼墙以该新的光源驱动参数驱动光 源进行显示。
本发明还提出一种光机， 用于屏幕拼墙， 包括上述的调整装置。 本发明还提出一种屏幕拼墙系统， 包括屏幕拼墙， 屏幕拼墙由至少 两个显示屏单元紧密拼接在一起， 该系统还包括上述的调整装置。 应用本发明的调整屏幕拼墙均匀性的方法， 可以只调整邻接区的屏 幕亮度和颜色而非调整区不变， 进而在实现均勾显示效果的同时保持屏 幕的较高亮度。 附图说明
图 1是 2 x 2屏幕拼墙的组装结构示意图；
图 2是本发明的第一实施例的示意图；
图 3是单个显示单元内邻接区和非邻接区划分示意图；
图 4是本发明的第一实施例中增加緩冲区后的示意图；
图 5是利用曲线拟合将邻接区亮度响应调整为緩慢渐变的示意图； 图 6是本发明的第二实施例的示意图；
图 7是本发明的第三实施例的示意图； 具体实施方式
为了更好的理解本发明，现以 2 X 2的屏幕拼墙为例对各实施例进行 具体说明。
图 1是一个 2 X 2屏幕拼墙的示意图， 由 &、 b、 c、 d四个显示单元 拼接而成。 显示单元可以是投影屏、 LED显示屏以及 LCD显示屏等。 通 常 a、 b、 c、 d 四个显示单元的亮度会不一致， 这种不一致将使得拼接 而成的屏幕拼墙在接缝处出现亮度的突变， 影响了拼墙的整体显示效 果。 这时若从整个拼墙中寻找出亮度最暗的区域， 然后将整个屏幕的亮 度调节到同该区域相同来保证整个拼墙亮度的均匀性， 无疑会极大地降 低显示图像的亮度。
对于实际屏幕拼墙来说， 为了保证其整体显示效果， 并不需要将所 有显示单元的亮度都调节到相同， 而只要使相邻显示单元在接缝处的亮 度没有突变即可。为了实现上述目的，首先需在屏幕拼墙内定义邻接区， 然后调整邻接区的亮度响应为均匀响应或不会引起突变感的渐变响应。 由于非邻接区的亮度不变， 相对于对整个屏幕都进行调整的传统方案来 说屏幕的显示亮度得以提高。 实际中， 常用的调整屏幕邻接区亮度响应 为均匀响应或渐变响应的方法是： 标定邻接区内每个位置的光调整系 数， 并根据该光调整系数来调整邻接区的亮度为均匀响应或不会引起突 变感的渐变响应。 此处所说的不会引起突变感的渐变响应指的是变化程 度緩慢从而不会引起人的察觉， 这种变化程度难以定量描述， 但可以在 实际中通过人眼观看的实验获得。
图 2为本发明第一实施例的示意图。 在本实施例中， 调整屏幕拼墙 均匀性的方法包括以下步骤 101-103:
步骤 101获取预定邻接区内每个位置的光调整系数， 邻接区覆盖屏 幕拼墙的所有接缝， 光调整系数使邻接区的图像显示对于输入信号的响 应为均匀响应或不会引起突变感的渐变响应。
以下首先解释邻接区。 在本实施例中， 对于 2 x 2的屏幕拼墙， 它具 有十字型的接缝， 定义其邻接区为覆盖所有接缝并沿接缝两侧分布有一 定宽度的十字型区域 21。 若拆开拼墙， 所定义的邻接区都将分布于每个 显示单元的边缘， 以图 2中的 a显示单元为例， 它的邻接区就分布于其 右边和下边的边缘。 邻接区边界可以是直线， 也可以是不规则曲线， 只 要邻接区覆盖了拼墙的所有接缝并沿接缝两侧分布有一定的宽度， 如图 3所示。 图 3为图 2中 a显示单元内邻接区和非邻接区划分示意图， 其 中 31为邻接区， 32为非邻接区， 33为邻接区和非邻接区边界， 34为邻 接区宽度。 在实际应用中， 邻接区与非邻接区之间的边界为曲线， 可以 减少人眼对两者之间亮度差别的敏感度， 使视觉效果更佳。
所谓邻接区的宽度指的是： 若邻接区分布于显示单元内某条边的边 缘， 则从该边的边沿上一点向显示单元内部垂直延伸的距离就是邻接区 在该点的宽度。 显然， 对于曲线边界的邻接区， 其邻接区的宽度分布处 处不同。 实际中， 邻接区的宽度可根据需要灵活选择。 优选地， 宽度不 超过其所在的显示单元中该宽度所属边边长的 1/5。 所谓该宽度所属边 指的是显示单元中与该宽度平行的边， 当邻接区沿显示单元的短边边缘 分布时， 显示单元的长边就是该邻接区的宽度所属边； 反之， 当邻接区 沿显示单元的长边边缘分布时， 显示单元的短边就是该邻接区的宽度所 属边。 例如在图 2中， 邻接区 211的宽度所属边就为长边 L, 而邻接区 212的宽度所属边就是短边1^。 显示单元中除去邻接区后的剩余部分， 定义为非邻接区。
对于由更多显示单元拼接而成的屏幕拼墙， 接缝由多条横竖相交的 线组成， 此时定义的邻接区也要覆盖拼墙的所有的接缝并沿接缝两侧具 有一定的宽度分布。 然而， 对于每个独立的显示单元而言， 其内部邻接 区总是分布于它的边缘。使邻接区的宽度不超过其所属边的边长的 1/5 , 可保证所有邻接区的面积只占到整个屏幕拼墙面积的小部分， 这样当邻 接区内的亮度被调整时， 整个屏幕拼墙内只有小部分区域的亮度被调 暗， 而整体依然具有较高的亮度。
以下解释邻接区的光调整系数的获取方法。
定义好邻接区后， 接着需标定邻接区内每个位置的光调整系数。 由 于光学上原因， 通常屏幕拼墙实际显示的图像会和输入的图像信号不 同， 也就是说屏幕拼墙的不同位置对于输入图像信号的响应不同； 所谓 光调整系数， 就是用来将实际显示的图像调整到和所需要的图像信号相 同的校准系数。 例如， 若一个局部过亮， 则需要将这个局部的图像信号 的亮度值乘以一个小于 1的校准系数或除以一个大于 1的校准系数使得 图像信号的亮度值降低， 该图像信号经过屏幕显示后就可以得到所需要 的亮度； 也就是说， 光调整系数的处理补偿了原屏幕显示的局部过亮问 题。 标定好的光调整系数可以存储于屏幕拼墙的控制装置中的不可擦除 的存储器内， 随时可以读取。
邻接区光调整系数的标定过程可以包括以下步骤：
1. 输入一幅特定的图像信号；
2. 采集屏幕拼墙对该特定图像信号显示的亮度分布；
3. 根据所采集的图像信息确定一个基准亮度区域；
4. 以该基准亮度区域的亮度作为基准来计算邻接区内每个位置的 光调整系数。
一种计算光调整系数的方法如下： 设所输入的特定图像信号为矩阵 p,而实际显示的图像为 q,将矩阵 p和 q中对应的元素相除得到矩阵 m, 即 m=q/p, m就相当于屏幕拼墙对均匀图像信号的响应； 对于任意输入 的图像信号， 只要将该图像信号和 m相乘即可得到拼墙实际显示的图 像。 从 m中找到邻接区所对应的子矩阵 n, 然后在 n中选定一个元素或 几个相邻元素的平均值作为基准将 n归一化， 归一化后的矩阵 N就是所 求的邻接区光调整系数， 该元素所在位置定义为基准亮度区。 利用该光 调整系数， 将邻接区的图像信号先除以该光调整系数再输出到屏幕显示 就可以实现对输入图像信号的响应均为均匀响应， 同时保持基准亮度区 域的响应不变。 也就是说， 每次输入一幅图像， 只需将其邻接区的图像 信号先除以该光调整系数再输出到屏幕显示， 即可使邻接区实际显示图 像调整到和输入图像信号在邻接区的亮度分布相同， 同时保证所选定的 基准亮度区域的亮度不变。
可以理解， 若图像信号 p直接使用均匀图像信号， 则 m=q, 即可以 节省一步除法运算过程， 是比较优选的。 另外， 将子矩阵 n归一化的过 程（除以一个常数） 实际上默认了要将显示图像调整均匀； 若不是调整 均匀而是调整为緩慢变化， 则可以将子矩阵 n除以一个特定的緩慢变化 分布的矩阵。
关于基准亮度区域的选择， 优选的， 可选择矩阵 n中最小的元素或 较小的几个相邻元素的平均值作为基准进行归一化， 此时选定的基准亮 度区域就是邻接区内相对于特定图像信号亮度最低的区域。 如此选择的 好处是： 归一化后的矩阵 N (即邻接区光调整系数） 中的每个元素值都 不小于 1 , 这样， 将邻接区输入的图像信号除以该光调整系数后的值都 只会变小， 对应于使邻接区显示的图像亮度降低， 所以这种调整总是可 以实现的。 当然， 其代价是将使邻接区图像损失一定的亮度。
若不以 n中的最小元素作为基准进行归一化， 那么所选定的基准亮 度区域就不是邻接区内相对于特定图像信号亮度最低的区域， 归一化后 的矩阵 N中将出现小于 1的元素值。对于这些小于 1的值所对应的区域， 若输入的图像信号值较大， 那么除以该光调整系数后所得结果就可能超 过拼墙所能显示的最大亮度而无法显示。 一种处理方式是对超过最大亮 度值以最大亮度值进行显示， 虽然牺牲了显示图像一定的灰阶数， 但相 对于以 n中最小元素作为基准归一化的情况， 却进一步提高了邻接区图 像的亮度。
以上都是从矩阵 n中选择一个特定的元素作为基准来对 n进行归一 化， 对应于从邻接区中选择一个特定的亮度区作为基准亮度区来确定邻 接区的光调整系数。 实际上我们也可以任意选定一个确定值作为基准来 对 n进行归一化， 该确定值不一定要出现在 n中。 例如， 选择 n中最大 值的 80%作为基准值， 将 n中的每个元素值都除以基准值来得到光调整 系数 N。 利用这样的光调整系数对邻接区内每个位置的图像亮度进行调 整时， 可能导致有的区域亮度提高， 有的区域亮度降低， 当 n中某个元 素的值小于基准值时， 对应于该元素所在的区域， 其亮度值将被提高， 当 n中某个元素的值大于基准值时，对应于该区域，其亮度值将被降低。 亮度降低时可以直接输出显示， 但亮度提高时就可能超过拼墙所能显示 的最大阔值， 同样， 可对超过最大阔值的亮度按最大亮度值进行输出显 示。 这样做的好处是不必再去寻找基准亮度区。 并且， 该值还可根据实 际需要灵活调整： 该值选择大， 则亮度损失小， 而灰阶牺牲多； 该值选 择小， 则亮度损失大， 但灰阶牺牲少。
另一种计算邻接区光调整系数的方法如下： 设所输入的特定图像信 号矩阵为 p,而实际显示的图像为 q,将矩阵 p除以 q得到矩阵 m, m=p/q (和前一种计算方法的区别在于分子和分母调换，所以此时 m中的每个 元素都是前述 m中对应元素的倒数）。 从 m中找到邻接区所对应的子矩 阵 n, 然后从 n中选定一个元素作为基准将子矩阵 n归一化， 该元素所 在位置就是选定的基准亮度区， 归一化后的矩阵 N就是另一种的光调整 系数。 利用该光调整系数， 以后每次输入一副图像信号， 都只需将其邻 接区的图像信号先乘以该光调整系数再输出显示， 即可使其实际显示的 图像亮度调整到和输入图像信号在邻接区的亮度分布相同， 同时保证所 选定的基准亮度区域的亮度不变。 关于 n中基准元素的选择， 即邻接区 内基准亮度区的选择， 同前述方法相反， 即从 n中选择最大元素相当于 前述方案中的在 n中选择最小元素， 从 n中选择最小元素相当于前述方 案中的在 n中选择最大元素， 当然也可以选择一个确定亮度值， 此处不 再赘述。
以上两种计算邻接区光调整系数的方法，是最简单也是最优的方式， 利用所计算的光调整系数， 只需将邻接区输入的图像信号乘以或除以该 光调整系数后再输出显示即可使显示的图像信号与输入图像信号相同 (对于 m=p/q的情况， 需采用乘法， 对于 m=q/p的情况， 需采用除法）。 实际上， 光调整系数的计算方法远不止以上两种， 可以采取更灵活的公
« =
Figure imgf000008_0001
无论采用何种计算公式， 都存在一个反向公式， 利用该反向公式可 以从 m和 q得到 p, 对于上述两个公式， 其反向公式如下： 、 、
p = q x \0 , p = q x m
该反向公式就是用来对输入图像信号进行调整的公式， 定义为调整 公式。 总之， 无论采取何种公式来计算光调整系数， 只要利用所计算的 光调整系数及对应的调整公式， 都可以将邻接区显示图像的亮度分布调 整到与所输入的图像信号在邻接区内的亮度分布相同。
此外， 也可以不将邻接区内的亮度响应调整均匀， 而是将其亮度响 应设置为緩慢渐变， 并保证邻接区与非邻接区交界的位置没有亮度突变 来实现均勾显示的效果。 一种借助图像信号处理中频谱滤波的方法来调 节邻接区亮度响应为緩慢渐变的步骤如下：先输入一幅特定图像信号 p, 设屏幕拼墙实际显示的图像信号为 q, 将矩阵 p和 q中对应的元素相除 得到矩阵 m, 即 m=q/p ( m为屏幕拼墙对均匀图像信号的响应 ) , 从 m 中找出邻接区所对应的子矩阵 n。 然后对该子矩阵 n进行二维离散傅里 叶变换得到其频谱分布， 再滤除频谱中的高频成分， 最后将滤波后的频 谱进行傅里叶逆变换得到新矩阵 N, 将 n与 N相应像素相除就得到所求 的每个位置的光调整系数。 利用该光调整系数， 只需将其邻接区的图像 信号先除以该光调整系数就能使邻接区图像显示对于输入信号的响应 为渐变响应。 也就是说以后每输入一幅图像， 只需将其邻接区的图像信 号先除以该光调整系数（因为 m的计算公式为 m=q/p ), 再输出到屏幕 显示即可实现均匀显示的效果。 这种方法的好处在于由于调整后的邻接 区图像显示的响应没有变为绝对的均匀响应， 而是依照原始响应的趋势 变为渐变响应， 在不影响显示效果的情况下调整的幅度较小， 亮度牺牲 也较小。
上述通过滤波计算得到的光调整系数矩阵中， 会有的一部分元素的 值小于 1 , 对于这些小于 1的元素所对应的邻接区， 输入的图像信号经 调整后将变大， 即对应于显示亮度将提高。 若输入的图像信号亮度值较 大， 那么除以该光调整系数后所得结果就可能超过拼墙所能显示的最大 阔值而无法显示， 此时可按前面描述过的方式处理： 对超过最大阔值的 亮度值以最大亮度值进行显示， 这样虽然牺牲了显示图像一定的灰阶， 但却提高了图像的亮度。 另外一种处理方式如下： 将光调整系数矩阵中 每个元素都加上一个相同的小量， 保证其中每个元素的值都不小于 1 , 这样可保证输入图像信号经调整后亮度都被降低， 所以总是可输出显示 的。
对于以其它公式计算的矩阵 m, 也可通过相同的高频滤波处理来得 到对应的光调整系数， 这些光调整系数也能实现邻接区亮度响应緩慢渐 变的效果。 只是再利用所计算的光调整系数进行邻接区亮度的调整时， 需根据该光调整系数所对应的调节公式去计算。 以上虽然是调整邻接区 亮度緩慢渐变的方法， 但是对于緩冲区亮度的调整， 也可以按照同样的 方法处理。
优选的，特定图像信号 p为均匀的图像信号，这样可以减少运算量。 关于将邻接区亮度响应调整为緩慢渐变响应的方法， 也可不通过频 谱滤波， 而是直接通过曲线拟合来使其亮度响应曲线光滑， 以图 5为例 进行说明。 在图 5 中， 离散点列 51为输入均匀图像后邻接区所显示的 图像沿某宽度截面的亮度响应， 曲线 52 为对该离散点列进行拟合后的 曲线， 曲线 53是将曲线 52整体向下平移后的曲线， 直线 54是以离散 点 51 中的最低亮度值为标准所画的水平线。 将离散点进行曲线拟合没 有固定的数学形式， 只要保证拟合曲线光滑且緩慢渐变即可， 也不必考 虑拟合的精度， 所以甚至可以人工去绘制。 拟合后的曲线就是调整后的 亮度响应， 为了使亮度的调整总是可实现， 需将拟合后的曲线整体向下 平移， 保证平移后的曲线处于所有离散点之下， 如图 5中曲线 53所示。 曲线 53相对于原离散亮度值所作的调整， 就是对应的光调整系数。 曲 线 53所对应的整体亮度明显要高于直线 54 , 所以这种以拟合曲线来将 邻接区亮度调整为緩慢渐变响应的方式， 相对于以邻接区最低亮度值作 为标准来将邻接区亮度调整为均匀响应的方式， 使邻接区具有更高的亮 度， 同时也能保证显示的图像具有较好的显示效果。 可以理解， 图 5显 示的是一个邻接区内一个宽度截面方向上的亮度响应， 实际上邻接区是 一个二维区域， 所以上述的曲线拟合也可能扩展为曲面拟合运算。 步骤 102 获取屏幕拼墙的输入图像信号。 从外界获得图像信号后， 将该图像信号的帧数据存入存储器 , 准备后续的计算处理。 步骤 103 采用光调整系数对输入图像信号进行调整得到新的输入 图像信号， 以便于屏幕拼墙以该新的输入图像信号进行显示； 或采用光 调整系数对根据输入图像信号得到的光源驱动参数进行调整得到新的 光源驱动参数， 以便于屏幕拼墙以该新的光源驱动参数驱动光源进行显 示。
计算出邻接区光调整系数后， 接着需根据该光调整系数对邻接区显 示的图像亮度进行调整， 其调整方式包括对图像信号的调整和对光源的 调整。 对图像信号的调整就是依据光调整系数和对应的调整公式对输入 的每一帧图像信号进行处理， 调整公式与得到该光调整系数时所采用的 公式相对应， 仅以 m=p/q的情况为例进行说明（其调整公式为 p=q x m, 对应于将图像信号乘以光调整系数）， 至于按其它公式计算出的光调整 系数， 完全类似。 若计算出的邻接区光调整系数矩阵为 N, 则对输入的 每一帧图像， 都需先将该图像信号乘以光调整系数矩阵 N, 然后再将计 算结果输出显示。 该技术需要高速图像处理芯片以快速实时地处理每一 帧图像， 成本较高。
对光源的调整就是根据光调整系数调整光源不同位置的输出功率。 典型地， 这种调节为调节光源的驱动电源， 包括调节驱动电源的电流或 电压， 其调节方式和对图像信号的调节类似： 例如， 若计算得到的光调 整系数为 N, 利用它进行图像信号的调整时， 我们需将输入的每一帧图 像 p乘以 N后再输出显示， 那么对应于光源的调整， 我们就需将该图像 信号的驱动电流值（与每一帧图像信号对应， 可以预先建立图像信号强 度与驱动电流值的映射表进而根据该映射表和每一帧图像得到每一个 位置的驱动电流值。 此为现有技术）乘以 N或者将驱动电源的占空比乘 以 N后再用于驱动光源。 显然， 该方法需要保证屏幕显示单元内每个像 素的电源驱动可单独控制。 此外， 我们也可以对每帧图像同时实施图像 信号的调整和光源的调整。 综合上述两种调整方法可以理解， 对于投影 屏或 LCD显示屏， 因无法对局部驱动电源进行调整， 可以借助对输入图 像信号的处理技术来调整显示亮度， 而对于 LED显示屏， 可以借助光源 处理技术直接调整每个 LED灯的输出功率。
利用上述邻接区光调整系数及调整方法， 可以将邻接区亮度调整均 匀， 但在邻接区和非邻接区之间可能会出现亮度突变， 此时解决的办法 是， 还包括以下步骤 104和步骤 105:
步骤 104 获取预定緩冲区内每个位置的光调整系数，緩冲区位于邻 接区与该调整方法不做调整的非调整区之间， 緩冲区的光调整系数使緩 冲区的图像显示对于输入信号的响应为不会引起突变感的渐变响应， 使 得緩冲区与邻接区交界的位置以及緩冲区与非调整区交界的位置没有 亮度突变。
非调整区位于屏幕拼墙单元的中心部位， 一般来说会占据屏幕拼墙 单元的主要显示面积。 緩冲区的设置如图 4所示， 41为十字形邻接区， 42a, 42b, 42c, 42d 为緩冲区， 当邻接区亮度比周围非邻接区亮度下降很 多时，通过该緩冲区的过渡，可以实现亮度的緩慢渐变而不会出现突变， 图中 43为整个拼接墙的亮度变化曲线。
緩冲区的宽度根据实际情况灵活选择， 根据常识， 当邻接区和非邻 接区亮度突变较大时， 緩冲区宽度应选择得大一些， 使得亮度过渡尽量 平緩； 反之， 当邻接区和非邻接区亮度突变较小时， 邻接区宽度可以选 择得小一些。 由于在不同显示单元内部， 邻接区和非邻接区边界上亮度 的突变通常是不同的， 所以緩冲区的宽度也是不同的。 优选地， 可以将 緩冲区亮度响应设置为沿宽度线性渐变， 当然也可以有其它渐变方式， 只要这种渐变程度不会 ^ I起视觉上的突变即可。
緩冲区的光调整系数的获取与邻接区的光调整系数的获取相似。 步 骤 1 04与步骤 1 01所完成的步骤接近， 也可以合并在一个步骤完成。
步骤 1 05 采用緩冲区的光调整系数对输入图像信号进行调整得到 新的输入图像信号， 以便于屏幕拼墙以该新的输入图像信号进行显示； 或采用緩冲区的光调整系数对根据输入图像信号得到的光源驱动参数 进行调整得到新的光源驱动参数， 以便于屏幕拼墙以该新的光源驱动参 数驱动光源进行显示。
步骤 1 05与步骤 1 03采取的动作相似，也可以合并在一个步骤完成。 应当理解， 当邻接区的亮度与非邻接区的亮度差别不足以引起人眼 的察觉时， 緩冲区则是不必要的。
综上所述， 与传统技术相比， 本发明在调整屏幕拼墙的亮度均匀性 时， 不是降低整个屏幕拼墙的亮度来保证其亮度的均勾性， 而是通过设 置邻接区， 只在邻接区或邻接区与緩冲区内调节亮度来实现局部亮度的 均匀响应或不会引起突变感的渐变响应， 同时， 由于占整个屏幕绝大部 分的非邻接区内的亮度都没有调节， 相对于现有技术， 整个拼墙的亮度 有了大幅度提高， 同时拼接显示效果良好。
图 6为本发明第二实施例的示意图。 其与第一实施例的区别在于， 此时邻接区 61 定义为每个显示单元的四周区域， 每个邻接区的宽度依 然根据实际情况选定， 优选地， 每个邻接区宽不超过其所属显示单元边 长的 1/5。 这样定义的邻接区的好处是， 可以在对屏幕拼墙进行拼接之 前， 预先将所有邻接区的亮度都调节到一个统一的合适的值， 保证不同 的显示单元拼接后其接缝两侧区域的亮度一致， 从而无需再进行邻接区 亮度的调整就能保证拼接墙接缝处亮度的一致。 预定义的适当的亮度值 可以根据实际情况来选择， 例如， 如果已知生产出的不同的显示单元， 其最低的亮度为最高亮度的 80% , 则可以将每个显示单元四周邻接区的 亮度统一调整为最高亮度值的 80%,这样可保证对于每个显示单元而言， 该临界区亮度的调整总是可以实现的。
同样， 当边缘邻接区与内部非邻接区之间出现亮度或颜色突变时， 可在邻接区与非邻接区之间进一步设置緩冲区， 緩冲区内的亮度响应随 位置緩慢渐变， 且保证緩冲区与邻接区的交界处以及緩冲区与非邻接区 的交界处没有亮度突变， 从而实现屏幕拼墙均勾显示的效果， 或者直接 将邻接区的亮度设置为緩慢渐变， 并保证邻接区与非邻接区交界的位置 没有亮度突变。 緩冲区宽度的设置以及如何将亮度调节至緩慢渐变和第 一实施例相同， 不在赘述。
这样， 通过只在邻接区或邻接区和緩冲区设定亮度使亮度下降， 而 其他区域不进行设定， 相对于现有技术亮度有了大幅度提高， 同时拼接 显示效果良好。 另外由于第二实施例中每个显示单元是在生产后就定义 好了邻接区以及邻接区的亮度， 不需要在拼接墙确定后再进行邻接区的 确定及后续图像处理， 能简单方便地实现拼接屏幕的扩展， 极大地方便 了客户的使用。
图 7为本发明第三实施例的示意图。 在前面所述的第一实施例中， 当邻接区面积较大或邻接区亮度变化较大时， 若依然将整个邻接区的亮 度调节到与其内部最低亮度区域的亮度值一致， 可能依然会使整个拼接 墙损失较大的亮度， 此时可按图 7所示， 进一步将邻接区沿所属显示单 元的边沿的延伸方向分为多块子邻接区， 然后以每一块子邻接区作为一 个独立的整体进行亮度的调节， 每个子邻接区的光调整系数使该子邻接 区的图像显示对于输入信号的响应为均匀响应或不会引起突变感的渐 变响应。 同时， 为了使相邻子邻接区的亮度不会出现突变， 可在相邻子 邻接区的邻接处进一步设置緩冲区， 或者直接通过频谱滤波的方法使相 邻块的亮度緩慢渐变。 关于如何在邻接处设置緩冲区以及如何调节亮度 来实现亮度均匀或緩慢渐变， 前面实施例中已有叙述， 此处不再说明。
通过对整个邻接区进行的进一步细分， 可以单独对每一块进行亮度 调整。 这样做的好处是， 如果整个邻接区的最暗区域出现在其中一个块 内， 则其它块的亮度就不需要调整到整个邻接区内的最暗区域的亮度， 而只需调整为其自己的块内的最暗区域的亮度。 这无疑进一步提高了显 示亮度。
以上只是介绍了 1 X 2屏幕拼墙亮度均匀性的调节方法，至于颜色均 匀性的调节， 只需应用上述方法将屏幕拼墙的每个基色图像的亮度都调 节均匀， 即可保证最后颜色的均匀性。 该基色图像可能是红色、 绿色、 蓝色三基色图像， 也可能是其它颜色的三基色图像， 总之， 只要保证每 个单色图像的亮度均匀， 即可保证最后颜色的均匀。
本发明还提出一种调整装置， 应用于屏幕拼墙， 屏幕拼墙由至少两 个屏幕显示单元紧密拼接在一起， 该调整装置包括：
第一获取模块， 用于获取预定邻接区内每个位置的光调整系数， 邻 接区覆盖屏幕拼墙的所有接缝， 光调整系数使邻接区的图像显示对于输 入信号的响应为均匀响应或不会引起突变感的渐变响应；
第二获取模块， 用于获取屏幕拼墙的输入图像信号；
调整模块， 用于采用光调整系数对输入图像信号进行调整得到新的 输入图像信号， 以便于屏幕拼墙以该新的输入图像信号进行显示； 或用 于采用光调整系数对根据输入图像信号得到的光源驱动参数进行调整 得到新的光源驱动参数， 以便于屏幕拼墙以该新的光源驱动参数驱动光 源进行显示。
可以理解， 第一获取模块的功能对应于前述的步骤 101 , 第二获取 模块的功能对应于前述的步骤 102 , 调整模块的功能对应于前述的步骤 103 , 此处不在详细描述。
对应于前述的步骤 104 , 该调整装置还可能包括第三获取模块， 用 于获取预定緩冲区内每个位置的光调整系数， 緩冲区位于邻接区与该调 整方法不做调整的非调整区之间， 緩冲区的光调整系数使緩冲区的图像 显示对于输入信号的响应为不会引起突变感的渐变响应， 使得緩冲区与 邻接区交界的位置以及緩冲区与非调整区交界的位置没有亮度突变。 显 然， 第三获取模块可以与第一获取模块为同一个模块。
对应于前述的步骤 105 , 调整模块还用于采用緩冲区的光调整系数 对输入图像信号进行调整得到新的输入图像信号 , 以便于屏幕拼墙以该 新的输入图像信号进行显示； 或采用緩冲区的光调整系数对根据输入图 像信号得到的光源驱动参数进行调整得到新的光源驱动参数， 以便于屏 幕拼墙以该新的光源驱动参数驱动光源进行显示。
本发明还提出一种光机， 用于屏幕拼墙。 光机包括光源装置、 光调 制装置、 投影光学系统与上述的调整装置。
该调整装置不仅具有上述各实施例中所提及的各功能， 还用于将调 整得到的新的输入图像信号发送给光调制装置； 光调制装置根据调整装 置发送的图像信号对光源装置发出的光进行调制以形成图像光。 或者， 该调整装置还用于将调整得到的新的光源驱动参数发送给光源装置； 光 源装置根据调整装置发送的光源驱动参数发出光， 光调制装置对光源装 置发出的光进行调制以形成图像光。 图像光经过投影光学系统投射出去 在屏幕上形成图像。
本发明还提出一种屏幕拼墙系统， 包括屏幕拼墙， 屏幕拼墙由至少 两个显示屏单元紧密拼接在一起， 该系统使用上述的调整装置来产生对 图像信号的均匀或渐变响应。
以上所述仅为本发明的实施例， 并非因此限制本发明的专利范围， 凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换， 或 直接或间接运用在其他相关的技术领域， 均同理包括在本发明的专利保 护范围内。

Claims

权 利 要 求 书
1、 一种调整方法， 应用于屏幕拼墙， 所述屏幕拼墙由至少两个屏 幕显示单元紧密拼接在一起， 其特征在于， 该调整方法包括：
获取预定邻接区内每个位置的光调整系数， 所述邻接区覆盖所述屏 幕拼墙的所有接缝， 所述光调整系数使邻接区的图像显示对于输入信号 的响应为均匀响应或不会引起突变感的渐变响应；
获取所述屏幕拼墙的输入图像信号；
采用所述光调整系数对所述输入图像信号进行调整得到新的输入 图像信号， 以便于所述屏幕拼墙以该新的输入图像信号进行显示； 或采 用所述光调整系数对根据所述输入图像信号得到的光源驱动参数进行 调整得到新的光源驱动参数， 以便于所述屏幕拼墙以该新的光源驱动参 数驱动光源进行显示。
2、 根据权利要求 1 所述的调整方法， 其特征在于： 所述的渐变响 应进一步满足人眼对所述屏幕拼墙在邻接区和非邻接区之间的图像显 示无突变感。
3、 根据权利要求 1 所述的调整方法， 其特征在于： 所述邻接区分 布于每个屏幕显示单元的四周边缘， 且所述光调整系数使邻接区的图像 显示对于输入信号的响应为预定的均匀响应。
4、 根据权利要求 1 所述的调整方法， 其特征在于： 所述邻接区边 界为曲线边界。
5、 根据权利要求 1 所述的调整方法， 其特征在于， 还包括以下步 骤：
获取预定緩冲区内每个位置的光调整系数， 所述緩冲区位于邻接区 与该调整方法不做调整的非调整区之间， 所述緩冲区的光调整系数使緩 冲区的图像显示对于输入信号的响应为不会引起突变感的渐变响应， 使 得緩冲区与邻接区交界的位置以及緩冲区与非调整区交界的位置没有 亮度突变；
采用所述緩冲区的光调整系数对所述输入图像信号进行调整得到 新的输入图像信号， 以便于所述屏幕拼墙以该新的输入图像信号进行显 示； 或采用所述緩冲区的光调整系数对根据所述输入图像信号得到的光 源驱动参数进行调整得到新的光源驱动参数， 以便于所述屏幕拼墙以该 新的光源驱动参数驱动光源进行显示。
6、 根据权利要求 1 所述的调整方法， 其特征在于： 所述邻接区进 一步包括沿所述显示单元的边沿的延伸方向分布的多个子邻接区， 每个 子邻接区的光调整系数使该子邻接区的图像显示对于输入信号的响应 为均匀响应或不会引起突变感的渐变响应。
7、 一种调整方法， 应用于屏幕拼墙， 该屏幕拼墙由至少两个屏幕 显示单元紧密拼接在一起， 且屏幕拼墙可以显示至少三种基色光， 第一 基色光， 第二基色光和第三基色光， 包括以下步骤：
应用根据权利要求 1至 6中任一项所述的调整方法调整第一基色光 的均匀性；
应用根据权利要求 1至 6中任一项所述的调整方法调整第二基色光 的均匀性；
应用根据权利要求 1至 6中任一项所述的调整方法调整第三基色光 的均匀性。
8、 一种调整装置， 应用于屏幕拼墙， 所述屏幕拼墙由至少两个屏 幕显示单元紧密拼接在一起， 其特征在于， 该调整装置包括：
第一获取模块， 用于获取预定邻接区内每个位置的光调整系数， 所 述邻接区覆盖所述屏幕拼墙的所有接缝， 所述光调整系数使邻接区的图 像显示对于输入信号的响应为均匀响应或不会引起突变感的渐变响应； 第二获取模块， 用于获取所述屏幕拼墙的输入图像信号； 调整模块， 用于采用所述光调整系数对所述输入图像信号进行调整 得到新的输入图像信号， 以便于所述屏幕拼墙以该新的输入图像信号进 行显示； 或用于采用所述光调整系数对根据所述输入图像信号得到的光 源驱动参数进行调整得到新的光源驱动参数， 以便于所述屏幕拼墙以该 新的光源驱动参数驱动光源进行显示。
9、 根据权利要求 8 所述的调整装置， 其特征在于： 所述的渐变响 应进一步满足人眼对所述屏幕拼墙在邻接区和非邻接区之间的图像显 示无突变感。
10、 根据权利要求 8所述的调整装置， 其特征在于： 所述邻接区分 布于每个屏幕显示单元的四周边缘， 且所述光调整系数使邻接区的图像 显示对于输入信号的响应为预定的均匀响应。
11、 根据权利要求 8所述的调整装置， 其特征在于： 所述邻接区边 界为曲线边界。
12、 根据权利要求 8所述的调整装置， 其特征在于：
还包括第三获取模块， 用于获取预定緩冲区内每个位置的光调整系 数， 所述緩冲区位于邻接区与该调整方法不做调整的非调整区之间， 所 述緩冲区的光调整系数使緩冲区的图像显示对于输入信号的响应为不 会引起突变感的渐变响应， 使得緩冲区与邻接区交界的位置以及緩冲区 与非调整区交界的位置没有亮度突变；
所述调整模块还用于采用所述緩冲区的光调整系数对所述输入图 像信号进行调整得到新的输入图像信号， 以便于所述屏幕拼墙以该新的 输入图像信号进行显示； 或采用所述緩冲区的光调整系数对根据所述输 入图像信号得到的光源驱动参数进行调整得到新的光源驱动参数， 以便 于所述屏幕拼墙以该新的光源驱动参数驱动光源进行显示。
1 3、 根据权利要求 8所述的调整装置， 其特征在于： 所述邻接区进 一步包括沿所述显示单元的边沿的延伸方向分布的多个子邻接区， 每个 子邻接区的光调整系数使该子邻接区的图像显示对于输入信号的响应 为均匀响应或不会引起突变感的渐变响应。
14、 一种光机， 用于屏幕拼墙， 其特征在于， 包括如权利要求 8-1 3 中任一项所述的调整装置。
15、 一种屏幕拼墙系统， 包括屏幕拼墙， 所述屏幕拼墙由至少两个 显示屏单元紧密拼接在一起， 其特征在于， 该系统还包括如权利要求 8-1 3任一项所述的调整装置。
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