WO2010031252A1 - 一种电子显示屏的亮度校正方法 - Google Patents
一种电子显示屏的亮度校正方法 Download PDFInfo
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- WO2010031252A1 WO2010031252A1 PCT/CN2009/001045 CN2009001045W WO2010031252A1 WO 2010031252 A1 WO2010031252 A1 WO 2010031252A1 CN 2009001045 W CN2009001045 W CN 2009001045W WO 2010031252 A1 WO2010031252 A1 WO 2010031252A1
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- Prior art keywords
- light
- emitting elements
- electronic display
- display screen
- image
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Classifications
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- 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
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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- 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
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- 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
Definitions
- the invention relates to a correction method in the field of display screens, in particular to a method for correcting brightness of an electronic display screen. Background technique
- the uneven brightness of each pixel of the electronic display can seriously affect the display quality.
- the unevenness of the brightness of each pixel is reflected in the discontinuity of the brightness of the display; It is said that the unevenness of the brightness of each pixel is not only reflected in the discontinuity of the brightness of the display screen, but also in the color distortion of the display.
- the light-emitting elements constituting the electronic display panel differ in characteristic parameters, and more than one light-emitting element constitutes one pixel point, and the difference in characteristic parameters of each light-emitting element represents each Differences in the characteristic parameters of the pixels, which will cause the difference in the instantaneous operating characteristics and the attenuation characteristics of the electronic display.
- the difference in the instantaneous working characteristics will lead to two problems, one is the single electronic display screen that has just been produced, and the brightness of the internal light-emitting elements is uneven; the other is the uneven brightness between the multiple electronic displays.
- the difference in the attenuation characteristics means that after the same period of time is used for each of the light-emitting elements constituting the electronic display panel, the luminance attenuation of each of the light-emitting elements is inconsistent, thereby causing a problem of luminance unevenness in the display screen.
- One method is for an electronic display screen with low display quality requirements.
- the manufacturer generally adopts a method of filtering the light-emitting elements, that is, by eliminating the light-emitting elements with poor uniformity of the light-emitting effect to achieve uniform brightness of the display screen, although this method can be improved. Brightness uniformity, but the screening process of the illuminating elements is time consuming and laborious.
- Another method is for an electronic display with high display quality requirements.
- the manufacturer will use a professional brightness correction device to perform point-by-point correction of each light-emitting element after the production of the electronic display.
- This correction method can achieve excellent correction.
- the effect but the calibration equipment is expensive, and the calibration process is time consuming for an electronic display screen composed of tens of thousands of light-emitting elements.
- the manufacturer needs to design a specific brightness adjusting device for the electronic display screen.
- the brightness of the display device is not uniform after a period of use, it is difficult to return the electronic display having uneven display brightness to the factory for correction, and it is necessary to perform on-site correction of the electronic display.
- field correction is performed by a specific brightness adjusting device, which is also done manually.
- the manual correction method requires the correction engineer to visually observe the electronic display screen through a specific brightness adjusting device with the naked eye to find the light-emitting element points with uneven brightness, and then manually adjust the brightness controller of the corresponding light-emitting element to perform correction. This correction method makes the calibration engineer very tired, and it is easy to introduce errors and errors, and it is often difficult to achieve excellent correction results.
- the brightness adjustment of the electronic display screen in the prior art is mostly realized by measuring the actual brightness values of the display light-emitting elements one by one, and then adjusting the brightness of the light-emitting elements one by one.
- the actual brightness value of 10 pixels, that is, 10 light-emitting elements is measured in 1 second, and an electron is adjusted.
- the display takes dozens of hours to complete, and the entire calibration process takes a lot of time and human resources.
- An object of the present invention is to provide a method for correcting the actual brightness value of a plurality of light-emitting elements of an electronic display screen to improve the brightness uniformity adjustment speed of the electronic display screen.
- Obtaining an image of the electronic display screen includes the following steps, wherein the steps A1 to A4 are in no order, and can be repeated and simultaneously performed:
- Al determining a shooting distance between the electronic display screen and the imaging unit; A2, determining a shooting brightness of the electronic display screen; A3, focusing the imaging unit; A4, determining a shooting parameter of the imaging unit; A5. Perform one or more photographs on the electronic display screen by using the imaging unit to obtain an image of the electronic display screen;
- BK determining the position of each of the light-emitting elements on the imaged image; B2, determining an imaging area of each of the light-emitting elements on the imaged image; B3, obtaining gray values of respective pixels in the image-forming area of the light-emitting elements, according to the Calculating a feature value of each of the light-emitting elements of the electronic display screen by using a gray value of each pixel in an imaging area of each of the light-emitting elements;
- step A1 the shooting distance is selected such that an angle between a captured area of the electronic display screen and the imaging unit is within 10 degrees.
- step A1 the shooting distance is selected such that the angle between the captured area of the electronic display screen and the imaging unit is at 5.
- step A1 the shooting distance is selected such that an angle between a captured area of the electronic display screen and the imaging unit is within 3 degrees.
- the brightness correction method wherein a single of the light-emitting elements corresponds to a plurality of pixels on the imaged image by performing step A2 or by performing step A4, or by simultaneously performing steps A2 and A4.
- the brightness correction method wherein a single of the light-emitting elements corresponds to at least 25 pixels on the imaged image by performing step A2 or by performing step A4, or by performing step A2 and step A4 simultaneously.
- the brightness correction method wherein, by performing step A2 or by performing step A4, or by performing step A2 and step A4 simultaneously, the imaged image is imaged in the imaging region of the light-emitting element, and the number of pixels saturated is occupied.
- the ratio of all imaging pixels of the light-emitting element is not more than 50%.
- the brightness correction method wherein, by performing step A2 or by performing step A4, or by simultaneously Step A2 and step A4 are performed such that the imaged image in the imaging region of the light-emitting element is imaged with a saturated pixel number, and the proportion of all the imaging pixels of the light-emitting element is not more than 20%.
- step A3 the method of focusing the imaging unit is: A31, determining a center point of two adjacent image pixels; A32, acquiring the center points of the two adjacent pixels a gray value; A33, obtaining a gray value of a midpoint of the line connecting the center points of the two adjacent pixels; A34, determining that the gray value of the midpoint is not greater than 1/ of the brightness value of the center point of any adjacent pixel 2.
- the shooting parameters include: an aperture, the size of the aperture determines how much light enters the photosensitive element; the filter reduces its imaging saturation to reach a predetermined value;
- the shutter is set to a scanning period of 50 to 100 times; ISO sensitivity, setting to avoid shooting under high sensitivity; focal length, setting the area of the electronic display screen in the framing frame to occupy 1/4 of the area of the finder frame.
- step B1 specifically includes the following steps: B11, determining the number of the light-emitting elements in the horizontal direction and the vertical direction of the imaged image; B12, determining the position of any one of the light-emitting elements on the imaged image B13, searching for the next illuminating element with the determined position of the illuminating element as a starting point; B14, iteratively searching each illuminating element by the method of step B13 until determining all the illuminating elements on the imaged image position.
- step B12 specifically includes: specifying or determining a position of a light-emitting element on the imaged image.
- step B12 specifically includes: designating a position of a light-emitting element on the imaged image, wherein the specified light-emitting element is selected from an upper left corner, a lower left corner, an upper right corner, or a right A light-emitting element at any position in the lower corner.
- step B12 further comprises a determining step of: determining whether the specified light-emitting element is damaged or missing, and if the specified light-emitting element is damaged or missing, designating the light-emitting element at an adjacent position or sequentially Light-emitting elements in position.
- step B2 specifically includes the following steps: B21: determining an imaging radius of each of the light-emitting elements on the image; B22, respectively, centering on positions of the light-emitting elements on the imaged image, The imaging area of each of the light-emitting elements on the picture is determined with the imaging radius of each of the light-emitting elements as a radius.
- step B3 specifically includes the following steps: B31: Obtain gray values of each pixel from the imaging regions of the light-emitting elements on the imaged image, including gray values of R, G, and B. B32. Calculate a gray value of each pixel in the imaging area according to a preset algorithm to obtain a feature value of the image of the light emitting element.
- step C specifically includes the following steps: Cl, calculating an actual brightness value of the light-emitting element by using a feature value of the light-emitting element image; C2, according to an actual brightness value of the light-emitting element The adjustment value of the light-emitting element is calculated.
- a method of correcting brightness of an electronic display screen, the electronic display screen comprising a plurality of discrete light-emitting elements, the method of correcting comprises the steps of:
- A01. Determine a shooting distance between the electronic display screen and the imaging unit, and determine shooting of the electronic display screen. Brightness, focusing on the imaging unit, determining shooting parameters of the imaging unit, the above sequence is in no order, and can be repeated and simultaneously performed, and the electronic display screen is photographed one or more times using the imaging unit, Obtaining an image of the electronic display screen;
- B01. Determine a quantity of the light-emitting elements in the horizontal direction and the vertical direction of the image, and determine a light-emitting element at any position of an upper left corner, a lower left corner, an upper right corner, or a lower right corner of the light-emitting element array, and the determined light is emitted.
- a method of correcting brightness of an electronic display screen, the electronic display screen comprising a plurality of discrete light-emitting elements, the method of correcting comprises the steps of:
- A02. Determine a shooting distance between the electronic display screen and the imaging unit, determine a shooting brightness of the electronic display screen, focus the imaging unit, and determine shooting parameters of the imaging unit, the order is in no particular order. And repeating and simultaneously performing, using the imaging unit to perform one or more photographs on the electronic display screen to obtain an image of the electronic display screen;
- B02 determining the number of the light-emitting elements in the horizontal direction and the vertical direction of the image, and determining the light-emitting elements at any of the upper left corner, the lower left corner, the upper right corner, or the lower right corner of the light-emitting element array, when the upper left corner, the lower left corner, and the upper right corner Or when the light-emitting element at any position in the lower right corner is damaged or missing, determining the light-emitting element at the adjacent position or the light-emitting element at the sequential position; searching for the next one with the determined position of the light-emitting element as the starting point a light-emitting element, iteratively searching for each of the light-emitting elements until determining a position of all the light-emitting elements on the imaged image; determining an imaging area of each of the light-emitting elements on the imaged image, and acquiring grayscales of pixels in the imaged area of each of the light-emitting elements And calculating, according to the gradation value
- D02 corrects the brightness of each of the light-emitting elements of the electronic display screen according to each of the adjustment values.
- the present invention provides a brightness correction method and system for an electronic display screen, which obtains an image of a plurality of light-emitting elements by photographing an electronic display screen, and acquires a plurality of light-emitting elements on the electronic display screen at a time. And obtaining an actual brightness value of the plurality of light-emitting elements by using the feature value, thereby performing brightness correction of the light-emitting element, reducing a time for measuring an actual brightness value of the light-emitting element, and improving brightness uniformity of the corrected electronic display screen.
- effectiveness DRAWINGS
- FIG. 1 is a flow chart of a method for correcting brightness of an electronic display screen according to the present invention
- FIG. 2A is a structural diagram of a first brightness correction system for an electronic display screen according to the present invention.
- 2B is a structural diagram of a second electronic display brightness correction system according to the present invention
- 3 is a light intensity distribution diagram of each of the typical light emitting diodes in the light emitting direction
- FIG. 4 is a functional structural diagram of an image processing and system control unit of the present invention.
- FIG. 5 is a schematic view showing the angle of view between the image capturing area and the imaging unit of the electronic display screen of the present invention. detailed description
- the brightness adjustment method of the electronic display screen provided by the present invention first determines the shooting distance between the electronic display screen and the imaging unit, determines the shooting brightness of the electronic display screen, focuses the imaging unit, and determines the The shooting parameters of the imaging unit, the above sequence are in no particular order, and can be repeated and simultaneously performed, taking photos of the illuminated electronic display screen to obtain an image of the image; determining the position of each light-emitting component on the imaged image again, determining the location Calculating an image forming area of each of the light-emitting elements on the image, calculating a feature value of the plurality of light-emitting element images on the electronic display screen according to the gray value of each pixel in the image forming area of each of the light-emitting elements; and utilizing characteristics of the image Determining an actual brightness value of each of the light-emitting elements as a function of a value of the actual brightness value of each of the light-emitting elements; and then obtaining an adjustment value of each of the light-emitting elements by a
- the method for adjusting the electronic display screen of the present invention specifically includes the following steps:
- Step 101 Determine a shooting distance between the imaging unit and the electronic display screen, where the determination of the shooting distance is determined by two factors.
- the first factor is that the light emitted by the electronic display light-emitting element has a certain directivity.
- Figure 3 shows a typical luminous intensity distribution of LEDs in all directions.
- the normal light emission direction of the light-emitting element is identified, and the luminous intensity in the normal direction is 100%, and the percentage of the luminous intensity at a certain angle deviating from the normal direction and the luminous intensity in the normal direction is taken as the luminous intensity in the direction. measure. It can be seen from FIG.
- the luminous intensity of the light-emitting element changes little; when the normal direction of the imaging unit lens and the light-emitting element emit light
- the angle between the normal directions is between 10° and 30 degrees.
- the luminous intensity of the illuminating element changes between 5% and 10%; when the angle between the normal direction of the imaging unit lens and the normal direction of the illuminating element is greater than 30°, the angle varies.
- the luminous intensity of the illuminating element will vary by more than 10%.
- the electronic display screen When the electronic display screen is photographed using the imaging unit, there is a difference between the normal direction of the light-emitting elements in the photographed area and the normal direction of the lens of the imaging unit, and this difference causes the imaging of each of the light-emitting elements to reflect There is a certain deviation in brightness. In order to reduce the correction error caused by such deviation, the angle of view between the imaged area of the electronic display screen and the imaging unit is required to be within a certain range.
- the second factor is that in order to make the eigenvalues of the respective illuminating elements more accurate, so that the calculation of the adjustment values is more accurate, it is necessary to image a single illuminating element on the picture to occupy a plurality of pixels.
- an electronic photosensitive element such as a CCD is formed by a plurality of minute photosensitive cells arranged in a regular manner, and there is a certain gap between the photosensitive cells.
- the photosensitive unit When the light-emitting normal direction of the light-emitting element is just aligned with the photosensitive unit, the photosensitive unit will feel strong When the normal direction of the light-emitting element is just aligned with the gap of the photosensitive unit, the light perceived by the photosensitive unit will be significantly lower than the light perceived in the foregoing case.
- the imaging of the illuminating element on the picture occupies only a few or a few pixels, this effect will significantly affect the calculation of the eigenvalues of the illuminating elements. This effect is improved when the imaging of the illuminating element on the picture occupies more pixels.
- imaging a single illuminating element on a picture to occupy at least 25 pixels will result in a more accurate eigenvalue of the illuminating element.
- the shooting distance between the electronic display screen and the imaging unit can be determined.
- Step 102 Determine a shooting brightness of the electronic display screen. Since the photosensitive element of the image forming apparatus has a certain brightness sensing range, when the brightness of the object to be photographed exceeds the brightness sensing range of the photosensitive element, the output signal of the photosensitive element will not completely reflect the brightness of the object to be photographed. In order for the imaging of the light-emitting element to correctly reflect the brightness of the light-emitting element, it is necessary to control the photographing brightness of the electronic display panel within an appropriate range.
- the light-emitting elements of the electronic display panel have high brightness, in order to fully meet the aforementioned requirements, it is necessary to set the brightness of the electronic display screen to 10% or less of the maximum brightness; and the electrons obtained at the brightness level
- the picture of the display does not reflect the difference in brightness of each light-emitting element under normal use conditions of the electronic display. Therefore, it is necessary to appropriately increase the brightness of the electronic display or adjust the shooting parameters of the imaging unit, or increase the brightness of the electronic display. And adjusting the shooting parameters of the imaging unit simultaneously.
- the ratio of the number of pixels to all of the imaging pixels of the light-emitting element shall not be greater than a certain range.
- Step 103 Focusing the imaging unit. First, adjust the zooming device of the imaging device so that the imaged area fills the entire imaging area of the imaging device as much as possible, and then adjust the focusing device of the imaging device to make the respective light-emitting elements image clear.
- the method of focusing the imaging unit is: determining a center point of two adjacent image pixels; acquiring gray values of the center points of the two adjacent pixels; acquiring the center points of the two adjacent pixels The gray value of the midpoint of the line; determining that the gray value of the midpoint is not more than 1/2 of the brightness value of the center point of any adjacent pixel.
- Step 104 Determine shooting parameters of the imaging unit, including parameters such as an ISO value, an aperture value, a shutter value, a focal length, and a filter, and the parameters directly affect the imaging result.
- Aperture a device used to control the amount of light that passes through the lens and into the photosensitive surface of the body. Its size determines how much light passes through the lens into the photosensitive element.
- the expression aperture size is represented by the F value, and the aperture is adjusted to be small (ie, the F value is the largest).
- the aperture is used to control the exposure amount of the photosensitive member.
- the setting of the aperture requires imaging of the illuminating element without overexposure.
- the shutter value is determined by the characteristics of the electronic display.
- the electronic display screen may be a scanning screen or a static screen.
- the shutter time must not be less than 50 times the scanning period; for a static screen, the shutter time should be close to the display period, or equivalent to the display period.
- the shutter when setting the shutter, adjust the shutter time to 50 or 100 times the scan period for the scanning screen. In this way, a shutter that is long enough to avoid capturing the scan line during shooting ensures accurate photo taking of the electronic screen.
- ISO sensitivity for example, fixed value of 80 or 100
- the photosensitive element of the digital camera belongs to the active component, there is dark current, the off current is set in the normal mode, and the part with noise interference is not used, the high sensitivity mode is Using the noise-prone part, these background noises are reflected in the image as random variegated colors, so it is not recommended to shoot in high-sensitivity environments.
- the ISO value will affect the sensitivity of the imaging device.
- noise is likely to appear on the image.
- the occurrence of noise may cause the imaging of the illuminating element to not reflect its brightness truly. Therefore, the present invention requires that the setting of the ISO value should minimize the occurrence of noise.
- the ISO value of the image forming apparatus is set to a minimum value that can be set.
- Focal length set the imaging unit to shoot on the electronic screen, its shooting area accounts for 1/4 of the entire electronic display area, after a large number of experiments, this can effectively avoid the line "border” phenomenon caused by the camera problem after adjustment on the electronic screen.
- the machine automatically measures or manually measures the spot light, and automatically or manually sets the appropriate shutter value according to the light in the field, so as to ensure that the light-emitting element is imaged without overexposure.
- Step 105 Take a photo of the electronic display screen. After determining various shooting parameters according to the foregoing steps, take a picture of the electronic display to obtain an image.
- the electronic display screen can be photographed multiple times to obtain a plurality of imaged images, so that the information of the plurality of pictures is used in subsequent steps to obtain the adjustment value of the light-emitting elements.
- Step 106 Calculate a feature value of each of the light-emitting elements. This step specifically includes:
- Step 106A Determine a position of each of the light-emitting elements on the imaged image.
- Step 106B Determine an imaging area of each of the light-emitting elements on the imaged image.
- Step 106C Calculate a characteristic value of each of the light-emitting elements based on the gradation value of each pixel in the imaging region of each of the light-emitting elements.
- the step 106A determines that the imaging position of each of the light-emitting elements on the picture comprises the following steps:
- Step 106A1 Determine the number of light-emitting elements in the horizontal direction and the vertical direction of the imaged image. .
- Step 106A2 specifying or determining a position of a light-emitting element on the imaged image, the specified light-emitting element, It may be a light-emitting element in any of the upper left corner, the lower left corner, the upper right corner or the lower right corner of the light-emitting element array, and the light-emitting element at any position of the upper left corner, the lower left corner, the upper right corner or the lower right corner is determined to be damaged or missing, and then specified Or determining a light-emitting element at an adjacent position or a light-emitting element at a sequential position; for example, determining that the light-emitting element in the upper left corner is damaged, and the light-emitting element adjacent to the right side of the light-emitting element emits light, determining the light-emitting element with its position as the next step Starting point.
- Step 106A3 using the position of the light-emitting element determined in step 106A2 as a starting point, iteratively searching for the next light-emitting element.
- Step 106A4 using the position of the light-emitting element that is iteratively searched in step 106A3 as a new starting point, iteratively searching for the next light-emitting element;
- Step 106A5 iteratively searches for each of the light-emitting elements by the method described in steps 106A3 to 106A4 until the positions of all the light-emitting elements on the imaged picture are determined.
- next illuminating element is searched and determined in a row-by-row or column-by-column manner until the position of all of the illuminating elements is determined.
- the step 106B determines that the imaging region of each of the light-emitting elements on the imaged image comprises the following steps: Step 106B1 determines an imaging radius of each of the light-emitting elements on the image.
- the operator determines the imaging radii of the same or different illumination elements by manually determining the image, or automatically determines the imaging radii of the same or different illuminating elements by the acquired pictures.
- Step 106B2 is respectively determined by the position of each of the light-emitting elements determined in the step 106A on the imaged image, and the area of the radius of each of the light-emitting elements determined by the step 106B1 is determined as the radius.
- the step 106C calculates the feature value of each light-emitting element according to the gray value of each pixel in the imaging region of each of the light-emitting elements, including the following steps:
- Step 106C1 Acquire gray values of each pixel from the imaging regions of the light-emitting elements on the imaged image determined in step 106B2, including gray values of R, G, and B.
- Step 3 ⁇ 4 106C2 calculating the gray value of each pixel in the imaging region of the light-emitting element determined in step 106C1 according to a preset algorithm to obtain a feature value of the light-emitting element.
- the preset algorithm in the step 106C2 includes summing the gray values of 1, G, and B of each pixel, summing the gray values of R, G, and B of each pixel, and R, G of each pixel.
- the gray value of B is obtained by weighted average sum and the like.
- Step 107 Determine an actual brightness value of each of the light-emitting elements. Since the imaging device is stable to the gradation value of the subject of the same brightness without the imaging parameters being constant, the feature value obtained from the gradation value is also stable. Therefore, the experimental test method can completely determine the relationship between the imaging feature value of the imaging device and the brightness value of the subject under various parameter settings. Based on this relationship and the characteristic values of the respective light-emitting elements calculated in step 106, the actual luminance values of the respective light-emitting elements can be determined.
- Step 108 Calculate the adjustment value by determining the characteristic value of each of the light-emitting elements.
- the adjustment values of the respective light-emitting elements can be determined according to the brightness correction requirements of the electronic display screen. For example, the actual luminance value of a certain light-emitting element, the corrected target luminance value, can be determined by Equation 1 to determine the luminance correction ratio R of the light-emitting element.
- the adjustment value of the light-emitting element can be determined according to the definition of the adjustment value in the actual system.
- the adjustment value is defined as the brightness correction ratio represented by an 8-bit binary number, and where lbit represents an integer and 7bit represents a decimal.
- the brightness correction ratio calculated by Equation 1 will be used as the adjustment value after integerization.
- the calculation method of the adjustment value is shown in Equation 2.
- Equation 2 [] represents a rounding operation.
- Step 109 Correct the brightness of each of the light-emitting elements of the electronic display screen according to each adjustment value.
- the adjustment value calculated in the step 108 is applied to the control device of the electronic display panel for correcting the brightness of each of the light-emitting elements for the purpose of uniformizing the brightness of the respective light-emitting elements.
- Step 110 Determine whether the light-emitting component of the electronic display screen is corrected. If the display screen has a portion that has no correction, return to step 105. If the calibration is completed, proceed to step 111.
- Step 111 The calibration process for the electronic display screen ends.
- the angle of view of the photographed area of the electronic display screen relative to the field of view of the imaging unit is controlled within 5°; that is, the shooting distance - the photographed area of the electronic display screen / 2 ( ⁇ /2), Wherein, the viewing angle ⁇ is less than or equal to 5 degrees.
- a preferred example is that the angle of the imaged area of the electronic display screen is less than 3° with respect to the field of view of the imaging unit, so that a better brightness correction effect can be obtained, as shown in FIG. Show.
- Figure 5 is a schematic view of the angle ⁇ of the field of view when the shooting area is the entire display. Depending on the shooting area, the angle ⁇ shown in Figure 5 will change depending on the shooting area.
- the position of a light-emitting element on the imaged picture is specified or determined, and the specified light-emitting element may be at any position in the upper left corner, the lower left corner, the upper right corner or the lower right corner of the light-emitting element array.
- the illuminating element when the illuminating element at any position of the upper left corner, the lower left corner, the upper right corner or the lower right corner is damaged or missing, specifies the illuminating element at the adjacent position, that is, the second position in the missing position, or the sequential position Light-emitting element, ie in the missing position The third, and so on.
- the imaging brightness of the electronic display screen is such that the number of pixels in which all the light-emitting elements are image-saturated in the imaging region corresponding to the imaged image accounts for the proportion of all the imaging pixels of the light-emitting element, the ratio is ⁇ 50%. That is, adjusting the shooting brightness of the display screen, or adjusting the filter, aperture, etc.
- the number of pixels saturated by imaging is less than 50% of all imaging pixels of the light-emitting element; if it is greater than 50%, the shooting brightness is continuously adjusted or the shooting parameters of the imaging unit are adjusted, or the brightness of the display is The shooting parameters of the imaging unit are adjusted simultaneously.
- Embodiment 1 On the basis of Embodiment 1, adjusting the shooting brightness of the electronic display screen, or adjusting the filter, aperture, etc. in the shooting parameters of the imaging unit, or simultaneously adjusting the shooting brightness of the display screen and the shooting parameters of the imaging unit, so that all the light-emitting elements are adjusted.
- the ratio of the number of pixels saturated in the imaging region corresponding to the imaging region in the imaged picture is not more than 20% of the total imaging pixels of the light-emitting element. Thus, when the ratio is 20%, the imaging of the light-emitting element can better reflect the brightness of the light-emitting element.
- the beneficial effects of the above embodiments are as follows:
- the brightness correction method of the electronic display screen provided by the invention can measure and obtain the adjustment values of the plurality of light-emitting elements at one time, and the correction speed is fast; the errors and errors caused by human factors are reduced, and the correction is improved. Precision.
- the electronic display brightness correction system 200 disclosed in the present invention is shown in FIG.
- the electronic display brightness correction system 200 includes an imaging unit 220 that takes a picture of the electronic display 240 and an image processing and system control unit 210.
- the electronic display screen 240 includes a plurality of light emitting elements 241; the image processing and system control unit 210 acquires a picture from the imaging unit 220; the image processing and system control unit 210 calculates all light emitting elements on the picture according to the picture
- the adjustment value is transmitted to the electronic display screen 240 for adjusting the brightness of the light-emitting element.
- some electronic display screens have the function of adjusting the brightness of the light-emitting elements according to the adjustment values of the light-emitting elements. Therefore, the brightness correction system 200 of the present invention only needs to obtain the adjustment value of the illuminating element, and the electronic display screen can realize the function of brightness adjustment.
- the electronic display brightness correction system 200 of FIG. 2 may further include a brightness adjustment unit; the image processing and system control unit 210 transmits each adjustment value to the brightness adjustment unit; the brightness adjustment unit is based on the adjustment value The brightness of the light-emitting element is corrected.
- the plurality of light-emitting elements 241 disposed on the electronic display 240 may be LED lights or any device that can emit light.
- the image processing and system control unit 210 and the brightness adjustment unit are connected by wires, network cables or optical fibers.
- the imaging unit 220 is configured to image the electronic display screen 240, which includes a high resolution photosensitive element, such as The CCD device, as well as the aperture, shutter and sensitivity processing module of a common imaging unit, is the ISO (International Standards Organization) value.
- the imaging unit 220 can manually set imaging parameter values to be achieved by the aperture, shutter, and ISO value processing modules as needed.
- the image processing and system control unit 210 includes a system control module 211 and a picture processing module 212 that are connected to each other, as shown in FIG.
- the picture processing module 212 is configured to calculate an adjustment value of all the light-emitting elements on the picture according to the picture acquired by the imaging unit 220.
- the system control module 211 is configured to operatively control the brightness correction system and transmit an adjustment value of the light emitting element to the electronic display screen 240.
- the image processing and system control unit 210 may further include an imaging control module 213 connected to the imaging unit 220 for controlling the aperture, shutter and ISO value processing module of the imaging unit 220 to the desired The imaging parameter value reached.
- the function of the imaging control module 213 is the same as that of the imaging unit 220 directly controlling the aperture, shutter and ISO value processing modules.
- the imaging control module 213 performs the setting under the control of the system control module 211, achieving a more convenient operation.
- the system control module 211, the picture processing module 212, and the imaging control module 213 of the image processing and system control unit 210 can be implemented by software and can be integrated into one piece of software.
- the imaging unit 220 and the image processing and system control unit 210 are directly connected to each other, or the picture is transmitted by a mobile storage device such as USB or the like.
- the beneficial effects of the embodiment are as follows:
- the brightness correction system of the electronic display screen provided by the invention rapidly measures the light-emitting characteristics of each light-emitting component of the electronic display screen by using an inexpensive device, quickly completes the brightness correction of the electronic display screen, and improves the electronic display screen.
- the brightness correction efficiency reduces the cost of the electronic display brightness correction system.
- the present invention provides an electronic display system, as shown in FIG. 2B, including the electronic display 240 and brightness. Correction system 300.
- the brightness correction system 300 includes an imaging unit 220, an image processing and system control unit 210; the brightness correction system includes an imaging unit 220, an image processing and system control unit 210; and the imaging unit 220 is configured to include a plurality of light-emitting elements
- the electronic display screen 240 is photographed; the image processing and system control unit 210 acquires an image from the imaging unit 220, calculates adjustment values of all the light-emitting elements on the image, and transmits the adjustment values to the electronic a display screen for correcting the brightness of the light emitting element.
- the electronic display system further includes a brightness adjustment unit 230; the image processing and system control unit 210 transmits the adjustment values to the brightness adjustment unit 230; the brightness adjustment unit 230 pairs the The brightness of the light-emitting element is corrected.
- the image processing module is configured to separately calculate adjustment values of all the light-emitting elements on the imaged image; the system control module is configured to control the operation of the brightness correction system, and transmit the adjustment values to the electronic display screen 240 .
- the image processing and system control unit 210 and the brightness adjusting unit 230 may select a network cable or an optical fiber connection according to the difference in distance.
- the plurality of light-emitting elements 241 disposed on the electronic display screen 240 may be LED lights or any device capable of emitting light.
- the imaging unit 220 is configured to image the electronic display screen 240, and includes a high-resolution photosensitive element, such as a CCD device, and an aperture, a shutter, and a sensitivity processing module of a common imaging unit, and the sensitivity is ISO (International Standards Organization) value.
- the imaging unit 220 is capable of manually setting the imaging parameter values to be achieved by the aperture, shutter and ISO value processing modules as needed.
- the image processing and system control unit 210 includes a system control module 211 and a picture processing module 212 that are connected to each other, as shown in FIG.
- the picture processing module 212 is configured to calculate an adjustment value of all the light-emitting elements on the picture according to the picture acquired by the imaging unit 220.
- the system control module 211 is configured to operatively control the brightness correction system and transmit an adjustment value of the light emitting element to the electronic display screen 240.
- the image processing and system control unit 210 may further include an imaging control module 213 connected to the imaging unit 220 for controlling the aperture, shutter and ISO value processing module of the imaging unit 220 to the desired The imaging parameter value reached.
- the function of the imaging control module 213 is the same as that of the imaging unit 220 controlling the aperture, the shutter and the ISO value processing module directly.
- the imaging control module 213 performs the setting under the control of the system control module 211, achieving a more convenient operation.
- the system control module 211, the picture processing module 212, and the imaging control module 213 of the image processing and system control unit 210 can be implemented by software and can be integrated into one piece of software.
- the imaging unit 220 and the image processing and system control unit 210 are directly connected to each other, or the picture is transmitted by a mobile storage device such as USB or the like.
- the beneficial effects of the embodiment are as follows:
- the brightness correction system of the electronic display screen provided by the invention rapidly measures the light-emitting characteristics of each light-emitting component of the electronic display screen by using an inexpensive device, quickly completes the brightness correction of the electronic display screen, and improves the electronic display screen.
- the brightness correction efficiency reduces the cost of the electronic display brightness correction system.
- a method for correcting brightness of an electronic display screen includes the following steps:
- A01. Determine a shooting distance between the electronic display screen and the imaging unit, determine a shooting brightness of the electronic display screen, focus the imaging unit, and determine shooting parameters of the imaging unit, the order is in no particular order. And repeating and simultaneously performing the photographing on the electronic display screen to obtain an image of the image;
- B01. Determine a quantity of the light-emitting elements in the horizontal direction and the vertical direction of the image, and determine a light-emitting element at any position of an upper left corner, a lower left corner, an upper right corner, or a lower right corner of the light-emitting element array, and the determined light is emitted.
- a method for correcting brightness of an electronic display screen includes the following steps:
- A02. Determine a shooting distance between the electronic display screen and the imaging unit, determine a shooting brightness of the electronic display screen, focus the imaging unit, and determine a shooting parameter of the imaging unit, and the above order is not divided. And repeating and simultaneously performing photographing on the electronic display screen to obtain an image of the image;
- B02 determining the number of the light-emitting elements in the horizontal direction and the vertical direction of the image, and determining the light-emitting elements in any of the upper left corner, the lower left corner, the upper right corner, or the lower right corner of the light-emitting element array, when the upper left corner, the lower left corner, and the upper right
- the light-emitting element at any position of the corner or the lower right corner is damaged or missing
- the light-emitting element at the adjacent position or the light-emitting element at the sequential position is determined; and the determined position of the light-emitting element is used as a starting point, and the search is performed.
- a light-emitting element iteratively searching for each light-emitting element until determining the position of all the light-emitting elements on the imaged image; determining an imaged area of each of the light-emitting elements on the imaged image, according to the gray of each pixel in the imaged area of each of the light-emitting elements Calculating a feature value of each of the light-emitting element images of the electronic display screen;
- Embodiments 1 to 5 can also be combined with Embodiments 1 to 5 to achieve a better correction effect, and will not be described again.
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Abstract
本发明公开了一种电子显示屏的亮度校正方法,包括以下步骤:对所述电子显示屏拍照;获取所述电子显示屏各发光元件影像的特征值;通过所述特征值计算所述发光元件的调整值;根据所述调整值校正所述电子显示屏各发光元件的亮度。本发明减少了测量发光元件实际亮度值的时间,提高了校正电子显示屏亮度均匀性的效率。
Description
一种电子显示屏的亮度校正方法 技术领域
本发明涉及显示屏领域的一种校正方法, 尤其涉及一种电子显示屏的亮度校正方法。 背景技术
电子显示屏各像素亮度的不均匀性会严重影响显示质量, 例如: 对于单色电子显示屏 来说, 各像素亮度的不均匀性体现在显示屏亮度的不连续上; 对彩色电子显示屏来说, 各 像素亮度的不均匀性不仅体现在显示屏亮度的不连续上, 还体现在显示的色彩失真上。
现有技术下, 由于生产工艺等因素的限制, 构成电子显示屏的发光元件在特性参数上 存在差异, 一个以上的发光元件构成一个像素点, 而各发光元件的特性参数差异也就代表 了各像素点的特性参数差异, 这将导致电子显示屏出现即时工作特性差异与衰减特性差 异。 所述即时工作特性差异将导致两方面的问题,一个是刚生产出的单个电子显示屏, 其 内部发光元件亮度不均匀问题; 另外一个是多个电子显示屏之间亮度不均匀问题。 所述衰 减特性的差异是指, 构成电子显示屏的各发光元件在使用相同的时间段之后, 各发光元件 的亮度衰减不一致, 从而使显示屏出现亮度不均匀问题。
为了保证电子显示屏的显示质量,解决因各发光元件的即时工作特性差异带来的电子 显示屏亮度不均匀问题, 现有技术下, 一般釆用以下两种方法来解决。 一种方法是针对显 示质量要求不高的电子显示屏, 制造者一般采用筛选发光元件的方法, 即通过剔除发光效 果均匀性差的发光元件来达到显示屏亮度均匀的目的, 这种方法虽然可以提高亮度均匀 性,但发光元件的筛选过程费时费力。另外一种方法是针对显示质量要求高的电子显示屏, 制造者会在电子显示屏生产完成后使用专业的亮度校正设备对各发光元件进行逐点校正 , 这种校正方法虽然可以达到优良的校正效果, 但校正设备价格昂贵, 而且, 对于由上万个 发光元件构成的电子显示屏来说校正过程十分费时。
为了解决各发光元件衰减特性差异带来的显示屏亮度不均匀问题, 制造者需要给电子 显示屏设计特定的亮度调整装置。 但是, 由于显示设备是在使用一段时间之后, 才出现亮 度不均匀的问题, 所以, 难以将显示亮度不均匀的电子显示屏返回工厂进行校正, 而是需 要对电子显示屏进行现场校正。 现有技术下, 通过特定的亮度调整装置进行现场校正, 也 是人工完成的。该人工校正的方法需要校正工程师用肉眼通过特定的亮度调整装置观察电 子显示屏, 以发现亮度不均匀的发光元件点, 然后人工逐点调整相应发光元件的亮度控制 器进行校正。 这种校正方法使校正工程师十分疲劳, 还容易引入错误和误差, 往往难以达 到优良的校正效果。
可见, 现有技术下对电子显示屏进行亮度调整, 大都是通过逐个测量显示屏发光元件 的实际亮度值, 然后逐个调整发光元件的亮度来实现的。 对于由数百万个发光元件构成的 电子显示屏来说, 假设 1秒测量 10个像素即 10个发光元件的实际亮度值, 调整一个电子
显示屏需要数十小时才能完成, 整个校正过程要耗费大量的时间和人力资源。
因此, 现有技术存在缺陷, 有待于进一步改进和发展。 发明内容
本发明的一个目的在于提供一种可以同时测量电子显示屏多个发光元件的实际亮度 值, 以提高电子显示屏亮度均匀性调整速度的校正方法。
本发明的技术方案如下:
一种电子^示屏的亮度校正方法, 所述电子显示屏包括多个分立的发光元件, 所述校 正方法包括以下步 ¾:
A、 获得所述电子显示屏的成像图片, 包括以下步骤, 其中步骤 A1至 A4的顺序不分 先后, 且可重复、 同时进行:
Al、 确定所述电子显示屏和成像单元之间的拍摄距离; A2、 确定所述电子显示屏的 拍摄亮度; A3、 对所述成像单元进行聚焦; A4、 确定所述成像单元的拍摄参数; A5、 使 用所述成像单元对所述电子显示屏进行一次或多次拍照, 以获得所述电子显示屏的成像图 片;
B、 获取所述电子显示屏的成像图片中各发光元件影像的特征值, 包括以下步骤,
BK 确定所述成像图片上各发光元件的位置; B2、 确定所述成像图片上各发光元件 的成像区域; B3、 获取所述各发光元件的成像区域中各像素的灰度值, 根据所述各发光元 件的成像区域中各像素的灰度值, 计算所述电子显示屏各发光元件影像的特征值;
C、 通过所述各发光元件影像的特征值计算所述电子显示屏的各发光元件的调整值;
D、 根据各所述调整值校正所述电子显示屏的各发光元件的亮度。
所述的亮度校正方法, 其中, 步骤 A1中, 选择所述拍摄距离, 使所述电子显示屏的 被拍摄区域同所述成像单元之间的视野夹角在 10° 以内。
所述的亮度校正方法, 其中, 步骤 A1中, 选择所述拍摄距离, 使所述电子显示屏的 被拍摄区域同所述成像单元之间的视野夹角在 5。 以内。
所述的亮度校正方法, 其中, 步骤 A1中, 选择所述拍摄距离, 使所述电子显示屏的 被拍摄区域同所述成像单元之间的视野夹角在 3° 以内。
所述的亮度校正方法, 其中, 通过执行步骤 A2或者通过执行步驟 A4, 或者通过同时 执行步骤 A2与步骤 A4 , 使单个所述发光元件对应所述成像图片上的多个像素。
所述的亮度校正方法, 其中, 通过执行步骤 A2或者通过执行步骤 A4, 或者通过同时 执行步驟 A2与步骤 A4, 使单个所述发光元件对应所述成像图片上至少 25个像素。
所述的亮度校正方法, 其中, 通过执行步驟 A2或者通过执行步骤 A4, 或者通过同时 执行步骤 A2与步骤 A4,使得所述成像图片在发光元件的成像区域中,成像饱和的像素数 量, 占所述发光元件所有成像像素的比例不大于 50 %。
所述的亮度校正方法, 其中, 通过执行步骤 A2或者通过执行步骤 A4, 或者通过同时
执行步骤 A2与步骤 A4,使得所迷成像图片在发光元件的成像区域中,成像饱和的像素数 量, 占所述发光元件所有成像像素的比例不大于 20 %。
所述的亮度校正方法, 其中, 步骤 A3中, 对所述成像单元进行聚焦的方法为: A31 , 确定两个相邻像像素的中心点; A32, 获取所述两个相邻像素中心点的灰度值; A33 , 获 取所述两个相邻像素中心点连线中点的灰度值; A34, 确定所述中点的灰度值不大于任一 相邻像素中心点亮度值的 1/2。
所述的亮度校正方法, 其中, 步骤 A4中, 所述拍摄参数包括: 光圈, 所述光圈的大 小决定进入感光元件的光线的多少; 滤镜, 降低其成像饱和度以达到预定数值; 快门, 所 述快门设置为 50至 100倍的扫描周期; ISO感光度, 设置避免高感光度下拍摄; 焦距, 设置取景框中电子显示屏面积占取景框面积的 1/4。
所述的亮度校正方法, 其中, 所述步骤 B1 具体包括如下步骤: Bll、 确定所述成像 图片水平方向与垂直方向上发光元件的数量; B12、 确定所述成像图片上任意一个发光元 件的位置; B13、以所述确定的所述发光元件的位置为起始点,搜索下一个发光元件; B14、 以所述步骤 B13的方法迭代搜索各发光元件,直至确定所述成像图片上所有发光元件的位 置。
所述的亮度校正方法, 其中, 所述步骤 B12具体包括: 指定或确定所述成像图片上一 个发光元件的位置。
所述的亮度校正方法, 其中, 所述步骤 B12具体包括: 指定所述成像图片上一个发光 元件的位置, 其中所指定的发光元件选自发光元件阵列中左上角、 左下角、 右上角或右下 角任一位置上的发光元件。
所述的亮度校正方法, 其中, 所述步驟 B12还包括判断步驟: 判断所指定的发光元件 是否损坏或缺失, 如果所指定的发光元件损坏或缺失, 则指定相邻位置上的发光元件或依 次位置上的发光元件。
所述的亮度校正方法, 其中, 所述步骤 B2具体包括如下步骤: B21、 确定所述图片 上各发光元件的成像半径; B22、 分别以所述成像图片上的各发光元件的位置为中心, 以 各发光元件的成像半径为半径, 确定所述图片上各发光元件的成像区域。
所述的亮度校正方法, 其中, 所述步骤 B3具体包括以下步骤: B31、 从所述成像图 片上各发光元件成像区域中获取各像素的灰度值, 包括 R、 G、 B的灰度值; B32、 将所述 成像区域中各像素的灰度值按照预设算法进行计算, 获得所述发光元件影像的特征值。
所述的亮度校正方法, 其中, 所述步骤 C具体包括以下步骤: Cl、 通过所述发光元 件影像的特征值计算所述发光元件的实际亮度值; C2、根据所述发光元件的实际亮度值计 算所述发光元件的调整值。
一种电子显示屏的亮度校正方法, 所述电子显示屏包括多个分立的发光元件, 所述校 正方法包括以下步驟:
A01、 确定所述电子显示屏和成像单元之间的拍摄距离, 确定所述电子显示屏的拍摄
亮度, 对所述成像单元进行聚焦, 确定所述成像单元的拍摄参数, 以上顺序不分先后, 且 可重复、 同时进行, 使用所述成像单元对所述电子显示屏进行一次或多次拍照, 以获得所 述电子显示屏的成像图片;
B01、 确定所述成像图片水平方向与垂直方向上发光元件的数量, 确定发光元件阵列 中左上角、 左下角、 右上角或右下角任一位置上的发光元件, 以所述确定的所述发光元件 的位置为起始点, 搜索下一个发光元件, 迭代搜索各发光元件, 直至确定所述成像图片上 所有发光元件的位置; 确定所述成像图片上各发光元件的成像区域, 获取所述各发光元件 的成像区域中各像素的灰度值, 根据所述各发光元件的成像区域中各像素的灰度值, 计算 所述电子显示屏的各发光元件影像的特征值;
C01、通过所述各发光元件影像的特征值计算所述电子显示屏的各发光元件的调整值;
D01、 根据各所述调整值校正所述电子显示屏的各发光元件的亮度。
一种电子显示屏的亮度校正方法, 所述电子显示屏包括多个分立的发光元件, 所述校 正方法包括以下步骤:
A02、 确定所述电子显示屏和成像单元之间的拍摄距离, 确定所述电子显示屏的拍摄 亮度, 对所述成像单元进行聚焦, 确定所述成像单元的拍摄参数, 以上顺序不分先后, 且 可重复、 同时进行, 使用所述成像单元对所述电子显示屏进行一次或多次拍照, 以获得所 述电子显示屏的成像图片;
B02 确定所述成像图片水平方向与垂直方向上发光元件的数量, 确定发光元件阵列 中左上角、 左下角、 右上角或右下角任一位置上的发光元件, 当左上角、 左下角、 右上角 或右下角任一位置上的发光元件损坏或缺失时,则确定相邻位置上的发光元件或依次位置 上的发光元件; 以所述确定的所述发光元件的位置为起始点, 搜索下一个发光元件, 迭代 搜索各发光元件, 直至确定所述成像图片上所有发光元件的位置; 确定所述成像图片上各 发光元件的成像区域, 获取所述各发光元件的成像区域中各像素的灰度值, 根据所述各发 光元件的成像区域中各像素的灰度值, 计算所述电子显示屏的各发光元件影像的特征值; C02、通过所述各发光元件影像的特征值计算所述电子显示屏的各发光元件的调整值;
D02 根据各所述调整值校正所述电子显示屏的各发光元件的亮度。
与现有技术相比, 本发明提供了一种电子显示屏的亮度校正方法与系统, 通过对电子 显示屏拍照获取具有多个发光元件的成像图片,一次获取电子显示屏上多个发光元件的特 征值, 并通过所述特征值得到所述多个发光元件的实际亮度值, 从而进行发光元件的亮度 校正,减少了测量发光元件实际亮度值的时间,提高了校正电子显示屏亮度均匀性的效率。 附图说明
图 1为本发明电子显示屏亮度校正方法的流程图;
图 2A为本发明第一种电子显示屏亮度校正系统的结构图;
图 2B为本发明第二种电子显示屏亮度校正系统的结构图;
图 3为一种典型的发光二极管各发光方向的光强分布图;
图 4为本发明图像处理与系统控制单元的功能结构图;
图 5为本发明电子显示屏被拍摄区域同成像单元之间的视野夹角示意图。 具体实施方式
下面结合附图, 对本发明的较佳实施例作进一步详细说明。
实施例 1
本发明提供的电子显示屏的亮度调整方法, 首先通过确定所述电子显示屏和成像单 元之间的拍摄距离、 确定所述电子显示屏的拍摄亮度、 对所述成像单元进行聚焦、 确定所 述成像单元的拍摄参数、 以上顺序不分先后,且可重复、 同时进行, 对所述点亮的电子显 示屏拍照, 获得成像图片; 再次通过确定所述成像图片上各发光元件的位置、 确定所述成 像图片上各发光元件的成像区域、根据所述各发光元件的成像区域中各像素的灰度值计算 所述电子显示屏上多个发光元件影像的特征值;再利用所述影像的特征值与各发光元件实 际亮度值之间的函数关系, 确定所述各发光元件的实际亮度值; 接着通过各发光元件实际 亮度值和目标亮度值的差异得到所述各发光元件的调整值; 最后通过所述各发光元件的调 整值调整各发光元件的亮度, 实现高效校正电子显示屏的目的。
本发明电子显示屏的调整方法, 如图 1所示, 具体包括以下步骤:
步骤 101、 确定成像单元与所述电子显示屏之间的拍摄距离, 所述拍摄距离的确定由 两方面的因素决定。
第一个因素是, 所述电子显示屏发光元件发出的光线具有一定的方向性。 图 3表示了 一种典型的发光二极管各方向上的发光强度分布。 图 3中, 标识了发光元件的发光法线方 向, 以法线方向的发光强度为 100 %, 偏离法线方向一定角度的发光强度与法线方向的发 光强度的百分比作为该方向的发光强度的度量。 从图 3可以看出, 当成像单元镜头法线方 向与发光元件发光法线方向的夹角在 10° 以内时, 发光元件的发光强度变化很小; 当成 像单元镜头法线方向与发光元件发光法线方向的夹角在 10° 至 30。 时,夹角每变化 10° , 发光元件的发光强度变化在 5 %至 10 %之间; 当成像单元镜头法线方向与发光元件发光法 线方向的夹角大于 30° 时, 夹角每变化 10° , 发光元件的发光强度变化将大于 10 %。 当 使用成像单元拍摄电子显示屏时,被拍摄区域中各发光元件的发光法线方向与成像单元镜 头法线方向之间的夹角存在差异,这种差异将导致各发光元件的成像在反映其亮度时存在 一定的偏差, 为了减小这种偏差带来的校正误差, 要求电子显示屏的被拍摄区域同所述成 像单元之间的视野夹角 Θ在一定范围内。
第二个因素是, 为了使各发光元件的特征值的求取更加准确, 从而使调整值的计算更 加准确, 需要使单个发光元件在图片上成像占据多个像素。 众所周知, 电子感光元件如 CCD 是由很多微小的感光单元按一定的规则排列在一起构成的, 而各感光单元之间存在 一定的间隙。 当发光元件的发光法线方向正好与感光单元对齐时, 感光单元将感受到很强
的光; 当发光元件的法线方向正好与感光单元的间隙对齐时, 感光单元感受到的光将明显 低于前述情况下所感受到的光。 当发光元件在图片上的成像仅占据一个或很少的几个像素 时, 这种影响将会明显影响发光元件特征值的计算。 当发光元件在图片上的成像占据较多 的像素时, 这种影响将得到改善。 作为本实施例的一个优选方案, 使单个发光元件在图片 上成像占据至少 25个像素, 将会使发光元件得到更加准确特征值。
基于以上两个因素, 再结合电子显示屏的物理尺寸, 即可确定电子显示屏与所述成像 单元之间的拍摄距离。
步骤 102、 确定电子显示屏的拍摄亮度。 由于成像设备感光元件具有一定的亮度感受 范围, 当被拍摄物体的亮度超过感光元件的亮度感受范围时, 感光元件的输出信号将不能 完全正确地反映被拍摄物体的亮度。为了使发光元件的成像能正确反映所述发光元件的亮 度, 需要将电子显示屏的拍摄亮度控制在适当的范围内。 另一方面, 由于电子显示屏的发 光元件具有很高的亮度, 为了完全达到前述要求, 需要将电子显示屏的亮度设置为最大亮 度的 10 %或者更小; 而这种亮度等级下获取的电子显示屏的图片不能很好地反映电子显 示屏通常使用条件下各发光元件的亮度差异, 因此, 需要适当提高电子显示屏的拍摄亮度 或调节成像单元的拍摄参数,或者提高电子显示屏的拍摄亮度及调节成像单元的拍摄参数 同时进行。
综合考虑, 调节电子显示屏的拍摄亮度或调节成像单元拍摄参数, 或对电子显示屏的 拍摄亮度及成像单元拍摄参数同时调节,使所有发光元件在成像图片中所对应的成像区域 中成像饱和的像素数量占所述发光元件所有成像像素的比例不得大于一定的范围。
步骤 103、 对所述成像单元进行聚焦。 首先调整成像设备的变焦装置, 使被拍摄区域 尽量充满成像设备的整个成像区域, 然后调整成像设备的聚焦装置, 使各发光元件成像清 晰。
例如: 调节镜头聚焦环, 使得电子显示屏的每个器件清晰呈现在取景框中, 此时, 继 续微量调节聚焦环, 这样每个器件呈现在取景框中清晰度有所下降, 此时为聚焦的最佳状 态。 此种技术方法的优势在于: 首先, ,避免了聚焦清晰造成的感光器件成像过饱和; 其 次, 清晰度有所下降的成像照片所占像素比例增加, 获得的数据更为准确。
再如: 对所述成像单元进行聚焦的方法为: 确定两个相邻像像素的中心点; 获取所述 两个相邻像素中心点的灰度值; 获取所述两个相邻像素中心点连线中点的灰度值; 确定所 述中点的灰度值不大于任一相邻像素中心点亮度值的 1/2。
步骤 104、 确定所述成像单元的拍摄参数, 包括 ISO值、 光圈值、 快门值、 焦距、 滤 镜等参数, 这些参数直接影响成像结果。
光圈, 一个用来控制光线透过镜头, 进入机身内感光面的光量的装置, 它的大小决 定着通过镜头进入感光元件的光线的多少。 例如, 表达光圈大小用 F值表示, 将光圈调节 到很小 (即 F值最大), 这样做优点有以下 2点: 首先, 小光圈可以滤除掉电子显示屏以 外的 "杂光", 这样设备获取亮度数据时, 取得的主要都是电子显示屏的数据; 即, 将外
界环境光对拍摄的影响降到最低。 其次, 小光圈可以一定程度上防止过亮的电子显示屏成 像时的图片过饱和。
在前述参数确定的情况下, 光圈用于控制感光元件的曝光量。 光圏的设置需要使发光 元件成像不出现过度曝光的现象。
快门值由电子显示屏的特性决定。 电子显示屏可以是扫描屏, 也可以是静态屏, 为了 使电子显示屏上各发光元件在成像时间内具有均等的发光机会,需要适当设置成像设备的 快门时间。 作为本实施例的一个优选方案, 对于扫描屏, 快门时间不得小于扫描周期的 50倍; 对于静态屏, 快门时间应接近于显示周期、 或相当于显示周期。
例如, 设置快门时, 对扫描电子屏, 将快门时间调节到 50或 100倍的扫描周期。 这 样, 足够长的快门可避免拍摄时捕捉到扫描线, 保证了对电子屏幕的准确拍照取值。
ISO感光度, 例如固定其值为 80或 100, 数码相机的感光元件属于主动元件, 存在暗 电流, 普通模式下设置了截止电流, 并不会使用到存在噪声干扰的部分, 高感光度模式是 利用到了存在噪声较大的部分, 这些背景噪声反映到图像上就是随机的杂色, 所以不建议 在高感光度环境下拍摄。
ISO值将影响成像设备的灵敏度, ISO设置值高时, 成像图片上容易出现噪点。 而噪 点的出现可能导致发光元件的成像不能真实反映其亮度, 因此, 本发明要求 ISO值的设置 应尽量减少噪点的出现。作为本实施例的一个优选方案, 将成像设备的 ISO值设定为其能 够设置的最小值。
焦距, 设置成像单元对电子屏拍摄, 其拍摄面积占整个电子显示屏面积的 1/4, 经过大 量实验, 这样能有效避免因相机问题调整后电子屏幕上产生的行, 列 "边框" 现象。
滤镜, 当成像饱和度大于预定数值时, 利用滤镜降低成像饱和度, 以使成像饱和度设 置在规定的预定数值范围内;
例如, 机器自动测定或由人工测定现场光线, 根据现场的光线来自动或人工设置合适 的快门值, 以此保证发光元件成像不出现过度曝光的现象。
步骤 105、 对所述电子显示屏进行拍照。 根据前述步骤确定好各种拍摄参数后, 对电 子显示屏拍照, 获取成像图片。 作为本实施实例的一个优选方案, 可以对电子显示屏多次 拍照, 获得多张成像图片, 以便后续步骤中使用多张图片的信息获取发光元件的调整值。
步骤 106、 计算各发光元件的特征值。 该步骤具体包括:
步骤 106A、 确定所述成像图片上各发光元件的位置。
步骤 106B、 确定所述成像图片上各发光元件的成像区域。
步骤 106C、 根据所述各发光元件的成像区域中各像素的灰度值计算各发光元件的特 征值。
所述步驟 106A确定各发光元件在所述图片上的成像位置包括以下步骤:
步骤 106A1、 确定所述成像图片水平方向与垂直方向上发光元件的数量。.
步骤 106A2、 指定或确定所述成像图片上一个发光元件的位置, 所指定的发光元件,
可以是发光元件阵列中左上角、 左下角、 右上角或右下角任一位置上的发光元件, 判断左 上角、 左下角、 右上角或右下角任一位置上的发光元件损坏或缺失, 则指定或确定相邻位 置上的发光元件或依次位置上的发光元件; 例如判断左上角的发光元件损坏, 其右边相邻 位置的发光元件发光, 则确定该发光元件, 以其位置作为下一步骤的起始点。
步骤 106A3、 以步骤 106A2所确定的所述发光元件的位置为起始点, 迭代搜索下一个 发光元件。
例如, 以 A为起点, 以逐行或逐列跳转的方式搜索下一个发光元件。
步骤 106A4、 以步骤 106A3中迭代搜索到的发光元件的位置为新的起始点, 迭代搜索 下一个发光元件;
步驟 106A5、 以步骤 106A3至 106A4所述的方法, 迭代搜索各发光元件, 直到确定 所述成像图片上所有发光元件的位置为止。
例如, 以逐行或逐列跳转的方式搜索并确定下一个发光元件, 直至确定所有发光元件 的位置。
所述步骤 106B确定所述成像图片上各发光元件的成像区域包括以下步骤: 步骤 106B1确定所述图片上各发光元件成像半径。
例如, 操作员以人工对图片测定的方式来确定各发光元件相同或不同的成像半径, 或 通过采集到的图片, 自动确定各发光元件相同或不同的成像半径。
步骤 106B2分別以所述步骤 106A中所确定的各发光元件的在所述成像图片上的位置 为中心, 以步骤 106B1所确定的各发光元件成像半径为半径的区域,确定为所述图片上各 发光元件的成像区域。
所述步骤 106C根据所述各发光元件的成像区域中各像素的灰度值计算各发光元件的 特征值包括以下步骤:
步骤 106C1、 从步骤 106B2所确定的所述成像图片上各发光元件的成像区域中获取 各像素的灰度值, 包括 R、 G、 B的灰度值。
步 ¾ 106C2、 将步骤 106C1中所确定的所述发光元件的所述成像区域中的各像素的 灰度值按照预设算法进行计算, 获得所述发光元件的特征值。
所述步骤 106C2中的预设算法包括将各像素的1 、 G、 B灰度值求和、 将各像素的 R、 G、 B的灰度值求平方和、 将各像素的 R、 G、 B的灰度值求加权平均和等。
步骤 107、 确定各发光元件的实际亮度值。 由于成像设备在成像参数不变的情况下, 对相同亮度的拍摄对象所成灰度值是稳定, 从灰度值获取的特征值也是稳定的。 因此, 通 过实验测试的方法可以完全确定成像设备在各种参数设置下成像特征值与拍摄物体亮度 值的关系。 根据这种关系以及步骤 106中所计算出的各发光元件的特征值, 即可确定各发 光元件的实际亮度值。
步驟 108、 通过确定各发光元件的特征值计算其调整值。 在步骤 107中确定各发光元 件的实际亮度值后, 根据电子显示屏的亮度校正需求即可确定各发光元件的调整值。
例如, 某发光元件的实际亮度值为 , 校正目标亮度值为 利用公式 1即可确定 该发光元件的亮度校正比例 R。
公式 1 : ? = — 1
L 通过公式 1计算出发光元件的亮度校正比例 R后,根据实际系统中调整值的定义即可 确定发光元件的调整值。
例如,假设调整值定义为一个 8bit二进制数表示的亮度校正比例, 且其中 lbit表示整 数, 7bit表示小数。 即将使用公式 1计算出的亮度校正比例 R整数化后作为调整值, 则调 整值的计算方法如公式 2所示。
公式 2: 调整值 = [R x 128]
公式 2中, []表示取整运算。
步骤 109、 根据各调整值校正所述电子显示屏各发光元件的亮度。 将所述步骤 108中 计算出的调整值应用到电子显示屏的控制装置中, 用于校正各发光元件的亮度, 达到使各 发光元件亮度均一的目的。
步骤 110、 判断所述电子显示屏的发光元件是否校正完毕, 如果显示屏还有没有校正 的部分, 返回步骤 105; 如果校正完毕, 进入步驟 111。
步驟 111、 对所述电子显示屏的校正过程结束。 实施例 2
在实施例 1的基础上,拍摄距离使所述电子显示屏的被拍摄区域同所述成像单元之间 的视野夹角在 10° 以内; 也就是说, 拍摄距离=电子显示屏的被拍摄区域 / ( 2 x tg (视野 夹角 /2 ) ), 其中, 视野夹角 Θ小于等于 10度。
实施例 3
在实施例 1的基础上, 电子显示屏的被拍摄区域相对所述成像单元的视野夹角 Θ控制 在 5° 以内; 即拍摄距离 -电子显示屏的被拍摄区域 / 2 ( θ /2), 其中, 视野夹角 Θ小于等 于 5度。
最佳实施例 4
在实施例 1的基础上, 一个最佳例子是, 电子显示屏的被拍摄区域相对所述成像单元 的视野夹角 Θ在 3° 以内, 这样可以得到更好的亮度校正效果, 如图 5所示。 图 5是拍摄 区域为整个显示屏时, 视野夹角 Θ的示意图, 根据拍摄区域的不同, 图 5所示的夹角 Θ会 随拍摄区域而改变。
在实施例 1步骤 106A2中、指定或确定所述成像图片上一个发光元件的位置,所指定 的发光元件, 可以是发光元件阵列中左上角、 左下角、 右上角或右下角任一位置上的发光 元件, 当左上角、 左下角、 右上角或右下角任一位置上的发光元件损坏或缺失, 则指定相 邻位置上的发光元件, 即缺失位置上的第二个, 或依次位置上的发光元件, 即缺失位置上
的第三个, 以此类推。
实施例 5
在实施例 1的基础上, 电子显示屏的拍摄亮度使所有发光元件在成像图片中所对应的 成像区域中成像饱和的像素数量占所述发光元件所有成像像素的比例, 该比例 < 50 % , 也 就是说, 调节显示屏的拍摄亮度, 或调节成像单元的拍摄参数中的滤镜、 光圈等, 或者显 示屏的拍摄亮度及成像单元的拍摄参数同时调节,使得所述成像图片在发光元件的成像区 域中, 成像饱和的像素数量, 占所述发光元件所有成像像素的比例不大于 50 % ; 如果大 于 50 %, 则继续调节拍摄亮度或调节成像单元的拍摄参数, 或者显示屏的拍摄亮度及成 像单元的拍摄参数同时调节。
实施例 6
在实施例 1的基础上, 调节电子显示屏的拍摄亮度, 或调节成像单元的拍摄参数中的 滤镜、 光圈等, 或者显示屏的拍摄亮度及成像单元的拍摄参数同时调节, 使所有发光元件 在成像图片中所对应的成像区域中成像饱和的像素数量占所述发光元件所有成像像素的 比例不大于 20 %。 这样, 当该比例 20 %时, 发光元件的成像能更好的反映所述发光元 件的亮度。
以上实施例的有益效果是: 本发明提供的电子显示屏的亮度校正方法, 一次性测量并 获得多个发光元件的调整值, 校正速度快; 减少了人为因素造成的错误和误差, 提高了校 正的精度。
实施例 7
本发明所公开的电子显示屏亮度校正系统 200, 如图 2所示。 所述电子显示屏亮度校 正系统 200包括对电子显示屏 240进行拍照的成像单元 220和图像处理与系统控制单元 210。 所述电子显示屏 240包括多个发光元件 241; 所述图像处理与系统控制单元 210从 所述成像单元 220获取图片; 所述图像处理与系统控制单元 210根据图片计算所述图片上 所有发光元件的调整值,并将用于对所述发光元件的亮度进行校正的调整值传输给所述电 子显示屏 240。
现有技术下, 部分电子显示屏具有根据发光元件的调整值, 就能对发光元件的亮度进 行调整的功能。 因此, 本发明的所述亮度校正系统 200只需要获得发光原件的调整值, 电 子显示屏就能实现亮度调整的功能。
图 2中的电子显示屏亮度校正系统 200, 还可以包括亮度调整单元; 所述图像处理与 系统控制单元 210将各调整值传输给所述亮度调整单元;所述亮度调整单元根据调整值对 所述发光元件的亮度进行校正。
所述电子显示屏 240上设置的多个发光元件 241 , 可以是 LED灯, 也可以是任意一种 可以发光的器件。
所述图像处理与系统控制单元 210和所述亮度调整单元采用导线、 网线或光纤连接。 所述成像单元 220用于对所述电子显示屏 240成像, 其包括高分辨率的感光元件, 如
CCD器件, 以及普通成像单元所具有的光圏、 快门和感光度处理模块, 感光度即 ISO ( International Standards Organization )值。 所述成像单元 220能够根据需要由人工设定光 圈、 快门和 ISO值处理模块所要达到的成像参数值。
所述图像处理与系统控制单元 210包括相互连接的系统控制模块 211和图片处理模块 212, 如图 4所示。 所述图片处理模块 212用于根据所述成像单元 220获取的图片, 并根 据图片计算所述图片上所有发光元件的调整值。所述系统控制模块 211用于所述亮度校正 系统运行地控制, 并将发光元件的调整值发送给所述电子显示屏 240。
所述图像处理与系统控制单元 210还可以包括成像控制模块 213 , 所述成像控制模块 213同所述成像单元 220连接, 用于控制所述成像单元 220的光圈、 快门和 ISO值处理模 块至所要达到的成像参数值。 所述成像控制模块 213的功能, 同直接在所述成像单元 220 控制光圈、 快门和 ISO值处理模块的功能相同。在光圈、 快门和 ISO值处理模块的设置值 已知时, 所述成像控制模块 213在所述系统控制模块 211的控制下执行所述设置, 会达到 操作更方便的效果。
所述图像处理与系统控制单元 210的系统控制模块 211、 图片处理模块 212和成像控 制模块 213可以通过软件实现, 并可以集成在一件软件中。
所述成像单元 220和图像处理与系统控制单元 210之间为直接物理连接, 或者通过移 动存储装置, 例如 USB等, 传输图片。
本实施例的有益效果是: 本发明提供的电子显示屏的亮度校正系统, 采用廉价的设 备快速测量电子显示屏各发光元件的发光特性, 快速完成电子显示屏的亮度校正, 提高了 电子显示屏的亮度校正效率, 降低了电子显示屏亮度校正系统的成本。
实施例 8
现有技术下 , 在电子显示屏不能根据发光元件的调整值对发光元件的亮度进行调整 的情况下, 本发明提供一种电子显示屏系统, 如图 2B所示, 包括电子显示屏 240和亮度 校正系统 300。 所述亮度校正系统 300包括成像单元 220, 图像处理与系统控制单元 210; 所述亮度校正系统包括成像单元 220、 图像处理与系统控制单元 210; 所述成像单元 220 用于对包括多个发光元件的电子显示屏 240拍照; 所述图像处理与系统控制单元 210从所 述成像单元 220获取成像图片, 分别计算所述成像图片上所有发光元件的调整值, 并将各 调整值传输给所述电子显示屏, 用于对所述发光元件的亮度进行校正。
所述一种电子显示屏系统, 还包括亮度调整单元 230; 所述图像处理与系统控制单元 210将各调整值传输给所述亮度调整单元 230; 所述亮度调整单元 230根据调整值对所述 发光元件的亮度进行校正。
所述图片处理模块用于分别计算所述成像图片上所有发光元件的调整值; 所述系统 控制模块用于所述亮度校正系统运行的控制 ,以及将各调整值传输给所述电子显示屏 240。
所述图像处理与系统控制单元 210同亮度调整单元 230之间, 可以根据距离的不同, 选择用网线或光纤连接。
所述电子显示屏 240上设置的多个发光元件 241 , 可以是 LED灯, 也可以是任意一种 可以发光的器件。
所述成像单元 220用于对所述电子显示屏 240成像, 其包括高分辨率的感光元件, 如 CCD器件, 以及普通成像单元所具有的光圈、 快门和感光度处理模块, 感光度即 ISO ( International Standards Organization )值。 所述成像单元 220能够根据需要由人工设定光 圈、 快门和 ISO值处理模块所要达到的成像参数值。
所述图像处理与系统控制单元 210包括相互连接的系统控制模块 211和图片处理模块 212, 如图 4所示。 所述图片处理模块 212用于根据所述成像单元 220获取的图片, 并根 据图片计算所述图片上所有发光元件的调整值。所述系统控制模块 211用于所述亮度校正 系统运行地控制, 并将发光元件的调整值发送给所述电子显示屏 240。
所述图像处理与系统控制单元 210还可以包括成像控制模块 213 , 所述成像控制模块 213同所述成像单元 220连接, 用于控制所述成像单元 220的光圈、 快门和 ISO值处理模 块至所要达到的成像参数值。 所述成像控制模块 213的功能, 同直接在所述成像单元 220 控制光圈、快门和 ISO值处理模块的功能相同。 在光圈、 快门和 ISO值处理模块的设置值 已知时, 所述成像控制模块 213在所述系统控制模块 211的控制下执行所述设置, 会达到 操作更方便的效果。
所述图像处理与系统控制单元 210的系统控制模块 211、 图片处理模块 212和成像控 制模块 213可以通过软件实现, 并可以集成在一件软件中。
所述成像单元 220和图像处理与系统控制单元 210之间为直接物理连接, 或者通过移 动存储装置, 例如 USB等, 传输图片。
本实施例的有益效果是: 本发明提供的电子显示屏的亮度校正系统, 采用廉价的设备 快速测量电子显示屏各发光元件的发光特性, 快速完成电子显示屏的亮度校正, 提高了电 子显示屏的亮度校正效率, 降低了电子显示屏亮度校正系统的成本。
实施例 9
一种电子显示屏的亮度校正方法, 包括以下步骤:
A01、 确定所迷电子显示屏和成像单元之间的拍摄距离, 确定所述电子显示屏的拍摄 亮度, 对所述成像单元进行聚焦, 确定所述成像单元的拍摄参数, 以上顺序不分先后, 且 可重复、 同时进行, 对所述电子显示屏拍照, 获得成像图片;
B01、 确定所述成像图片水平方向与垂直方向上发光元件的数量, 确定发光元件阵列 中左上角、 左下角、 右上角或右下角任一位置上的发光元件, 以所述确定的所述发光元件 的位置为起始点, 搜索下一个发光元件, 迭代搜索各发光元件, 直至确定所述成像图片上 所有发光元件的位置; 确定所述成像图片上各发光元件的成像区域, 根据所述各发光元件 的成像区域中各像素的灰度值计算所述电子显示屏各发光元件影像的特征值;
C01、 通过各发光元件的特征值计算其调整值;
D01、 根据各调整值校正所述电子显示屏各发光元件的亮度。
其还能与实施例 1至 5相结合, 实现更好的校正效果, 在此不再赘述。 实施例 10
一种电子显示屏的亮度校正方法, 包括以下步骤:
A02、 确定所述电子显示屏和成像单元之间的拍摄距离, 确定所述电子显示屏的拍摄 亮度, 对所述成像单元进行聚焦, 确定所迷成像单元的拍摄参数, 以上顺序不分來后, 且 可重复、 同时进行, 对所述电子显示屏拍照, 获得成像图片;
B02、 确定所述成像图片水平方向与垂直方向上发光元件的数量, 确定发光元件阵列 中左上角、 左下角、 右上角或右下角任一位置上的发光元件, 当左上角、 左下角、 右上角 或右下角任一位置上的发光元件损坏或缺失时,则确定相邻位置上的发光元件或依次位置 上的发光元件; 以所述确定的所述发光元件的位置为起始点, 搜索下一个发光元件, 迭代 搜索各发光元件, 直至确定所述成像图片上所有发光元件的位置; 确定所述成像图片上各 发光元件的成像区域,根据所述各发光元件的成像区域中各像素的灰度值计算所述电子显 示屏各发光元件影像的特征值;
C02、 通过各发光元件的特征值计算其调整值;
D02、 根据各调整值校正所述电子显示屏各发光元件的亮度。
其还能与实施例 1至 5相结合, 实现更好的校正效果, 在此不再赘述。
应当理解的是, 上述针对本发明较佳实施例的表述较为详细, 并不能因此而认为是对 本发明专利保护范围的限制, 本发明的专利保护范围应以所附权利要求为准。
Claims
1、 一种电子显示屏的亮度校正方法, 所述电子显示屏包括多个分立的发光元件, 所述校正方法包括以下步 :
A、 获得所述电子显示屏的成像图片, 包括以下步骤, 其中步骤 A1至 A4的顺序不 分先后,且可重复、 同时进行:
A1、 确定所述电子显示屏和成像单元之间的拍摄距离;
A2、 确定所述电子显示屏的拍摄亮度;
A3、 对所述成像单元进行聚焦;
A4、 确定所述成像单元的拍摄参数;
A5、 使用所述成像单元对所述电子显示屏进行一次或多次拍照, 以获得所述 电子显示屏的成像图片;
B、 获取所述电子显示屏的成像图片中各发光元件影像的特征值, 包括以下步骤, B1、 确定所述成像图片上各发光元件的位置;
B2、 确定所述成像图片上各发光元件的成像区域;
B3、获取所述各发光元件的成像区域中各像素的灰度值,根据所述各发光元件 的成像区域中各像素的灰度值, 计算所迷电子显示屏各发光元件影像的特征值; C、通过所述各发光元件影像的特征值计算所述电子显示屏的各发光元件的调整值; D、 根据各所述调整值校正所述电子显示屏的各发光元件的亮度。
2、 根据权利要求 1所述的亮度校正方法, 其特征在于, 步骤 A1中, 选择所述拍 摄距离, 使所述电子显示屏的被拍摄区域同所述成像单元之间的视野夹角在 10。以内。
3、 根据权利要求 1所述的亮度校正方法, 其特征在于, 步骤 A1中, 选择所述拍 摄距离, 使所述电子显示屏的被拍摄区域同所述成像单元之间的视野夹角在 5°以内。
4、 根据权利要求 1所述的亮度校正方法, 其特征在于, 步骤 A1中, 选择所述拍 摄距离, 使所述电子显示屏的被拍摄区域同所述成像单元之间的视野夹角在 3。以内。
5、 根据权利要求 1所述的亮度校正方法, 其特征在于, 通过执行步骤 A2或者通 过执行步骤 A4, 或者通过同时执行步驟 A2与步驟 A4, 使单个所述发光元件对应所述成 像图片上的多个像素。 .
6、 根据权利要求 1所述的亮度校正方法, 其特征在于, 通过执行步驟 A2或者通 过执行步骤 A4, 或者通过同时执行步骤 A2与步骤 A4, 使单个所述发光元件对应所述成 像图片上至少 25个像素。
7、 根据权利要求 1所述的亮度校正方法, 其特征在于, 通过执行步骤 A2或者通 过执行步骤 A4 , 或者通过同时执行步骤 A2与步骤 A4 , 使得所述成像图片在发光元件的 成像区域中, 成像饱和的像素数量, 占所述发光元件所有成像像素的比例不大于 50 %。
8、 根据权利要求 1所述的亮度校正方法, 其特征在于, 通过执行步骤 A2或者通
过执行步骤 A4, 或者通过同时执行步骤 A2与步骤 A4, 使得所述成像图片在发光元件的 成像区域中, 成像饱和的像素数量, 占所述发光元件所有成像像素的比例不大于 20 %。
9、 根据权利要求 1所述的亮度校正方法, 其特征在于, 步厥 A3中, 对所述成像 单元进行聚焦的方法为:
A31 , 确定两个相邻像像素的中心点;
A32, 获取所述两个相邻像素中心点的灰度值;
A33 , 获取所述两个相邻像素中心点连线中点的灰度值;
A34, 确定所述中点的灰度值不大于任一相邻像素中心点亮度值的二分之一。
10、 据权利要求 1所述的亮度校正方法, 其特征在于, 步骤 A4中, 所述拍摄参数 包括:
光圏, 所述光圏的大小决定进入感光元件的光线的多少;
滤镜, P条低其成像饱和度以达到预定数值;
快门, 所述快门设置为 50至 100倍的扫描周期;
ISO感光度, 设置避免高感光度下拍摄;
焦距, 设置取景框中电子显示屏面积占取景框面积的 1/4。
11、 根据权利要求 1所述的亮度校正方法, 其特征在于, 所述步骤 B 1具体包括如 下步骤:
B 11、 确定所述成像图片水平方向与垂直方向上发光元件的数量;
B12、 确定所述成像图片上任意一个发光元件的位置;
B13、 以所述确定的所述发光元件的位置为起始点, 搜索下一个发光元件;
B14、 以所述步骤 B13的方法迭代搜索各发光元件, 直至确定所述成像图片上所有 发光元件的位置。
12、 根据权利要求 9所述的亮度校正方法, 其特征在于, 所述步骤 B12具体包括: 指定或确定所述成像图片上一个发光元件的位置。
13、 根据权利要求 10所述的亮度校正方法,其特征在于,所述步骤 B12具体包括: 指定所述成像图片上一个发光元件的位置,其中所指定的发光元件选自发光元件阵列中左 上角、 左下角、 右上角或右下角任一位置上的发光元件。
14、 根据权利要求 11所述的亮度校正方法, 其特征在于, 所述步骤 B12还包括判 断步骤: 判断所指定的发光元件是否损坏或缺失, 如果所指定的发光元件损坏或缺失, 则 指定相邻位置上的发光元件或依次位置上的发光元件。
15、 根据权利要求 1所述的亮度校正方法, 其特征在于, ·所述步驟 B2具体包括如 下步骤:
B21、 确定所述图片上各发光元件的成像半径;
B22、 分别以所述成像图片上的各发光元件的位置为中心, 以各发光元件的成像半 径为半径, 确定所述图片上各发光元件的成像区域。
16、 根据权利要求 1所述的亮度校正方法, 其特征在于, 所述步骤 B3具体包括以 下步骤:
B31、 从所述成像图片上各发光元件成像区域中获取各像素的灰度值, 包括 R、 G、 B的灰度值;
B32> 将所述成像区域中各像素的灰度值按照预设算法进行计算, 获得所述发光元 件影像的特征值。
17、 根据权利要求 1所述的亮度校正方法,其特征在于,所述步驟 C具体包括以下 步骤:
C1、 通过所述发光元件影像的特征值计算所述发光元件的实际亮度值;
C2、 根据所述发光元件的实际亮度值计算所述发光元件的调整值。
18、 一种电子显示屏的亮度校正方法, 所迷电子显示屏包括多个分立的发光元件, 所述校正方法包括以下步骤:
A01、 确定所述电子显示屏和成像单元之间的拍摄距离, 确定所述电子显示屏的拍 摄亮度, 对所述成像单元进行聚焦, 确定所述成像单元的拍摄参数, 以上顺序不分先 后, 且可重复、 同时进行, 使用所述成像单元对所述电子显示屏进行一次或多次拍照, 以获得所述电子显示屏的成像图片;
B01、 确定所述成像图片水平方向与垂直方向上发光元件的数量, 确定发光元件阵 列中左上角、 左下角、 右上角或右下角任一位置上的发光元件, 以所述确定的所述发 光元件的位置为起始点, 搜索下一个发光元件, 迭代搜索各发光元件, 直至确定所述 成像图片上所有发光元件的位置; 确定所述成像图片上各发光元件的成像区域, 获取 所述各发光元件的成像区域中各像素的灰度值, 根据所述各发光元件的成像区域中各 像素的灰度值, 计算所述电子显示屏的各发光元件影像的特征值;
C01、 通过所述各发光元件影像的特征值计算所述电子显示屏的各发光元件的调整 值;
D01、 根据各所述调整值校正所述电子显示屏的各发光元件的亮度。
19、 一种电子显示屏的亮度校正方法, 所述电子显示屏包括多个分立的发光元件, 所述校正方法包括以下步骤:
A02、 确定所述电子显示屏和成像单元之间的拍摄距离, 确定所述电子显示屏的拍 摄亮度, 对所述成像单元进行聚焦, 确定所述成像单元的拍摄参数, 以上顺序不分先 后, 且可重复、 同时进行, 使用所述成像单元对所述电子显示屏进行一次或多次拍照, 以获得所述电子显示屏的成像图片;
B02、 确定所述成像图片水平方向与垂直方向上发光元件的数量, 确定发光元件阵 列中左上角、 左下角、 右上角或右下角任一位置上的发光元件, 当左上角、 左下角、 右上角或右下角任一位置上的发光元件损坏或缺失时, 则确定相邻位置上的发光元件 或依次位置上的发光元件; 以所述确定的所述发光元件的位置为起始点, 搜索下一个
发光元件, 迭代搜索各发光元件, 直至确定所述成像图片上所有发光元件的位置; 确 定所述成像图片上各发光元件的成像区域, 获取所述各发光元件的成像区域中各像素 的灰度值, 根据所述各发光元件的成像区域中各像素的灰度值, 计算所述电子显示屏 的各发光元件影像的特征值;
C02、 通过所述各发光元件影像的特征值计算所述电子显示屏的各发光元件的调整 值;
D02、 根据各所述调整值校正所述电子显示屏的各发光元件的亮度。
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