CN116546332A - Compensation method for high-frame-rate image display, high-frame-rate image display device and display module - Google Patents
Compensation method for high-frame-rate image display, high-frame-rate image display device and display module Download PDFInfo
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Abstract
The invention relates to the technical field of image display, and provides a compensation method for high-frame-rate image display, which comprises the following steps: receiving an original frame image according to a time sequence; copying the original frame image to obtain a compensation frame image; adjusting the brightness of the original frame image and/or the compensation frame image so that the brightness of the original frame image is different from the brightness of the compensation frame image; and inserting the compensation frame image after the original frame image corresponding to the compensation frame image under the condition that the playing interval of the original frame image is not changed. Therefore, the high-frame-rate image display is realized, adverse situations such as image breakage, jelly effect and the like are avoided, the image quality of a picture is ensured, and the cost of the compensation method is lower compared with that of a MEMC dynamic compensation mode.
Description
Technical Field
The present invention relates to the field of image display technologies, and in particular, to a compensation method for high-frame-rate image display, a device for high-frame-rate image display, and a display module.
Background
With the development of display technology, the demand for high frame rate image display is increasing. At present, high frame rate image display is mainly realized by a Motion estimation/Motion compensation (Motion estimation/Motion compensation) mode. The MEMC dynamic compensation mode is to store at least two images of 60HZ in front and back frames, judge the moving direction of an object through image capturing, calculate the middle motion mode, store the calculated result into a middle image, and then insert the middle image between the two images in front and back frames, so that a double-magnification image is formed, and the high-response image quality requirement is met.
However, in the MEMC dynamic compensation method, in a case of a severe motion, the interpolated picture may have disadvantages such as image breakage and jelly effect, resulting in degradation of picture image quality. Moreover, the MEMC dynamic compensation method is quite expensive.
It should be noted that the information disclosed in this background section is only for the purpose of increasing the understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.
Disclosure of Invention
In order to solve the problem that the picture image quality is poor under the condition of intense motion in the existing MEMC dynamic compensation mode, the invention obtains the compensation frame image by copying the original frame image, adjusts the brightness of the original frame image and/or the compensation frame image, enables the brightness of the original frame image and the brightness of the compensation frame image to be different, realizes high-frame-rate image display, does not have the adverse situations such as image breakage, jelly effect and the like, and ensures the picture image quality.
An embodiment of the present invention provides a compensation method for high frame rate image display, which includes the following steps: receiving an original frame image according to a time sequence; copying the original frame image to obtain a compensation frame image; adjusting the brightness of the original frame image and/or the compensation frame image so that the brightness of the original frame image is different from the brightness of the compensation frame image; and inserting the compensation frame image after the original frame image corresponding to the compensation frame image under the condition that the playing interval of the original frame image is not changed.
In some embodiments, adjusting the brightness of the original frame image and/or the compensated frame image comprises the steps of: the brightness of the original frame image is kept unchanged, and the brightness of the compensation frame image is reduced to 40% -60% of the brightness of the original frame image.
In some embodiments, after the step of reducing the brightness of the compensated frame image is completed, the method further comprises the steps of: and adjusting the gamma curve of the compensation frame image to enable the gamma curve to deviate to a low gray level area.
In some embodiments, adjusting the gamma curve of the compensated frame image is by a histogram equalization method, the adjusting the gamma curve using the histogram equalization method comprising the steps of: converting the input compensation frame image into a corresponding gray level image; calculating a histogram of the gray level image; calculating a cumulative distribution function of the histogram; calculating a new mapping value of the pixel value of the gray image using the cumulative distribution function, and replacing the original mapping value with the new mapping value; and calculating the gamma curve of the adjusted compensation frame image.
In some embodiments, calculating the cumulative distribution function includes the steps of: dividing the pixel value of the gray image into a preset number of gray scales, and calculating the number of pixel values in each gray scale; normalizing the histogram, and dividing the number of pixel values of each gray scale number by the total number of pixels of the gray scale image to obtain the occurrence probability of each pixel value; a cumulative distribution function of the normalized histogram is calculated, and for each pixel value, the sum of the occurrence probability thereof and the occurrence probability of the total pixel value is calculated.
In some embodiments, the formula for calculating the sum of the occurrence probabilities is: CDF (i) =sum (p (k)), where CDF (i) is the sum of the proportions of the pixel points whose pixel values are equal to or less than i in the input image, i and k are both pixel values, the value range of the pixel value k is 0 to i, and p (k) is the occurrence probability of the pixel value k.
An embodiment of the present invention further provides a device for displaying high-frame-rate images, which adopts the compensation method for displaying high-frame-rate images according to any one of the foregoing embodiments, where the device for displaying high-frame-rate images includes a receiving unit, a copying unit, an adjusting unit, and an inserting unit. The receiving unit is used for receiving the original frame image according to the time sequence; the copying unit is connected with the receiving unit and used for copying the original frame image to obtain a compensation frame image; the adjusting unit is connected with the copying unit and is used for adjusting the brightness of the original frame image and/or the compensation frame image so as to enable the brightness of the original frame image and the brightness of the compensation frame image to be different; the inserting unit is connected with the adjusting unit and is used for inserting the compensation frame image after the original frame image corresponding to the compensation frame image under the condition that the playing interval of the original frame image is not changed.
An embodiment of the present invention further provides a display module, which includes a display panel, a driving device for driving the display panel, and a device for displaying high-frame-rate images according to any of the foregoing embodiments, where the device for displaying high-frame-rate images is configured to perform frame rate compensation on a display image of the display panel.
In summary, according to the compensation method for high-frame-rate image display, the device for high-frame-rate image display and the display module provided by the embodiments of the present invention, the original frame image is copied to obtain the compensation frame image, and the brightness of the original frame image and/or the compensation frame image is adjusted, so that the high-frame-rate image display is realized in a manner that the brightness of the original frame image and the brightness of the compensation frame image are different, adverse situations such as image breakage and jelly effect are not generated, the image quality of the image is ensured, and the cost of the compensation method is lower compared with that of the MEMC dynamic compensation manner.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities particularly pointed out in the specification and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required for the embodiments or the prior art descriptions, and it is obvious that some of the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flowchart illustrating a compensation method for high frame rate image display according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating a low gray level variation of an image message according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an image message with a gamma curve for low gray scale according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a processing manner related to brightness and gamma curves of an original frame image and a compensated frame image according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention; the technical features designed in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other; all other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center," "lateral," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or components referred to must have a specific orientation or be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more. In addition, the term "comprising" and any variations thereof are meant to be "at least inclusive".
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between the two components. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
Referring to fig. 1, fig. 1 is a flowchart illustrating a compensation method for high frame rate image display according to an embodiment of the invention. To achieve at least one of the advantages and other advantages, an embodiment of the present invention provides a compensation method for high frame rate image display, as shown in the drawings, the compensation method includes the following steps:
s100: the original frame image is received in time sequence. That is, the original frame images are sequentially received in the normal time order.
S200: and copying the original frame image to obtain a compensation frame image. That is, the original frame image received in time sequence is copied one by one, and the copied image is a compensation frame image and is used as a subsequent picture compensation image.
S300: the brightness of the original frame image and/or the compensation frame image is adjusted so that the brightness of the original frame image and the compensation frame image are different.
S400: and inserting the compensation frame image after the original frame image corresponding to the compensation frame image under the condition that the playing interval of the original frame image is not changed.
The original frame image is duplicated to obtain the compensation frame image, and the brightness of the original frame image and/or the compensation frame image is adjusted, so that the original frame image and the compensation frame image have different brightness modes, the original image with the smear can be clear, the temporary effect of human eyes is mainly utilized, the effect of reducing the dynamic blur is achieved, the smear phenomenon of the liquid crystal display can be eliminated, and the image breakage can not be generated.
In step S300, adjusting the brightness of the original frame image and/or the compensated frame image includes the steps of: the brightness of the original frame image is kept unchanged, and the brightness of the compensation frame image is reduced to 40% -60% of the brightness of the original frame image. However, the present invention is not limited thereto, and the brightness of the original frame image and/or the compensation frame image may be adjusted by increasing the brightness of the original frame image to at least 1.5 times the brightness of the compensation frame image, but the display effect is slightly worse than that by decreasing the brightness of the compensation frame image in consideration of the effect of the excessive brightness of the screen. In addition, the brightness of the original frame image and/or the compensation frame image can be adjusted simultaneously, for example, the brightness of the original frame image is improved and the brightness of the compensation frame image is reduced.
As an alternative embodiment, after the step of reducing the brightness of the compensated frame image is completed, the following steps may be further included: and adjusting a Gamma curve of the compensated frame image to bias the Gamma curve to a low gray level region.
In some embodiments, adjusting the gamma curve of the compensated frame image may be by a histogram equalization method. Specifically, the adjustment of the gamma curve using the histogram equalization method includes the steps of: converting the input compensation frame image into a corresponding gray level image; calculating a histogram of the gray level image; calculating a cumulative distribution function of the histogram; calculating a new mapping value of the pixel value of the gray image using the cumulative distribution function, and replacing the original mapping value with the new mapping value; and calculating the gamma curve of the adjusted compensation frame image.
Calculating the cumulative distribution function includes the steps of: dividing the pixel value of the gray image into a preset number of gray scales, and calculating the number of pixel values in each gray scale; normalizing the histogram, and dividing the number of pixel values of each gray scale number by the total number of pixels of the gray scale image to obtain the occurrence probability of each pixel value; a cumulative distribution function of the normalized histogram is calculated, and for each pixel value, the sum of the occurrence probability thereof and the occurrence probability of the total pixel value is calculated.
The formula for calculating the sum of the occurrence probabilities is: CDF (i) =sum (p (k)). Wherein CDF (i) is the sum of the proportion of pixel points with pixel values less than or equal to i in the input image, i and k are both pixel values, the value range of the pixel value k is 0-i, and p (k) is the occurrence probability of the pixel value k.
Taking fig. 2 and 3 as an example, normal image presentation is presented in the order of 1, 2, 3 at 60 hz. The invention copies each original frame image to obtain a corresponding compensation frame image. Then, the brightness of the compensation frame image is reduced. Then, under the condition that the playing interval of the original Frame image is not changed, after the compensation Frame image is inserted into the original Frame image corresponding to the compensation Frame image, a Double Frame presentation image is formed, the effect of reducing the dynamic blur is achieved by utilizing the temporary effect of human eyes, the high-Frame-rate image display is realized, and adverse situations such as image breakage, jelly effect and the like are avoided.
Fig. 2 illustrates that when the first frame is an original frame image, the brightness and gamma curve are in a general setting state, and when the copy frame (compensation frame image) is a copy of the original frame image of the first frame, the brightness of the compensation frame image is switched to 40% -60%, and the gamma curve is deviated to less than 20% of the original frame image, so as to reduce the brightness and gray level, and the human eye persistence effect will be reduced.
FIG. 3 illustrates the effect of using the actual brightness and gamma curve adjusted replica frames, thus at the bottom, the object is moved at a high frame rate to reduce the blurring of the object movement.
The processing mode for reducing the brightness of the picture can be as follows: the brightness is controlled by using the control signal of the backlight source or the OLED light emission, for example, the brightness of the backlight source is reduced by using the control signal of the time schedule controller (Timing Controller), or the light emitting circuit is driven to operate by using the pulse signal in one frame by using the EL control signal in the OLED panel, for example, the light emitting brightness can be reduced by sending 50% of the duty cycle signal.
Subsequently, the gamma curve can be adjusted in an auxiliary manner, for example, the history of the gray level of the image is judged, and the gamma curve is adjusted to deviate to the low gray level area, so that the compensation frame image is changed in low gray level, the moving blurring effect is reduced, and the image display quality is improved.
Referring to fig. 4, fig. 4 is a schematic diagram illustrating a processing manner of the respective frame brightness and gamma curves of the original frame image and the compensated frame image. In the original frame image, the brightness is adjusted to be in a normal state, and the gamma adjustment curve is also normal. When compensating the frame image, the corresponding brightness adjustment is performed according to the image frame, for example, the gamma adjustment curve is reduced together, so that no obvious smear effect is generated at high frequency multiplication frame rate.
Further, as shown in fig. 4, the following is a processing manner in a frame buffer (the frame buffer is used by a video output device to drive a video display device from a memory buffer containing complete frame data) when processing parity frames: when the odd frame is processed, the content of one frame is copied to another block of the frame buffer, the compensation is performed, and when the video is to be output, the original frame image and the compensation frame image are captured from the frame buffer according to the double frame rate and output.
In the gamma automatic adjustment, a histogram equalization (histogram equalization) mode may be used. Histogram equalization is a method by which the gamma curve of an image can be adjusted, automatically enhancing the contrast of the image.
The following is a step of automatically adjusting the gamma curve of an image using histogram equalization: first, an input compensation frame image is converted into a corresponding gray-scale image. Next, a histogram of the gray-scale image is calculated. Then, a Cumulative Distribution Function (CDF) of the histogram is calculated. Then, a new map value of pixel values of the gray image is calculated using a Cumulative Distribution Function (CDF), and the new map value is substituted for the original map value. Finally, the gamma curve of the adjusted compensation frame image is calculated.
Wherein the Cumulative Distribution Function (CDF) is a function describing the probability that a random variable X will take on a value at a certain point X. In image processing, CDF is typically used to represent the cumulative distribution of each pixel value in an image. Calculating the cumulative distribution function includes the steps of: calculating a histogram of the gray image, dividing pixel values of the gray image into a preset number of gray levels, and calculating the number of pixel values in each gray level. And normalizing the histogram, and dividing the number of the pixel values of each gray level by the total number of pixels of the image to obtain the occurrence probability of each pixel value. A cumulative distribution function of the normalized histogram is calculated, and for each pixel value, the sum of its occurrence probability and the occurrence probability of all the preceding pixel values is calculated. Namely: CDF (i) =sum (p (k)), where CDF (i) is the sum of the proportions of the pixel points whose pixel values are equal to or less than i in the input image, i and k are both pixel values, the value range of the pixel value k is 0 to i, and p (k) is the occurrence probability of the pixel value k. In calculating the CDF, the pixel values may be first sorted in order from small to large. If the CDF value is scaled to a range of 0 to 255, the CDF value is multiplied by 255 and then the result is rounded to the nearest integer, resulting in a mapped pixel value. And replacing the pixel value with the mapped value to obtain the CDF equalized image.
An embodiment of the present invention further provides a device for displaying high-frame-rate images, which adopts the compensation method for displaying high-frame-rate images according to any one of the foregoing embodiments, where the device for displaying high-frame-rate images includes a receiving unit, a copying unit, an adjusting unit, and an inserting unit. The receiving unit is used for receiving the original frame image according to the time sequence; the copying unit is connected with the receiving unit and used for copying the original frame image to obtain a compensation frame image; the adjusting unit is connected with the copying unit and is used for adjusting the brightness of the original frame image and/or the compensation frame image so as to enable the brightness of the original frame image and the brightness of the compensation frame image to be different; the inserting unit is connected with the adjusting unit and is used for inserting the compensation frame image after the original frame image corresponding to the compensation frame image under the condition that the playing interval of the original frame image is not changed.
An embodiment of the present invention further provides a display module, which includes a display panel, a driving device for driving the display panel, and a device for displaying high-frame-rate images according to any of the foregoing embodiments, where the device for displaying high-frame-rate images is configured to perform frame rate compensation on a display image of the display panel.
In summary, according to the compensation method for high-frame-rate image display, the device for high-frame-rate image display and the display module provided by the embodiments of the present invention, the original frame image is copied to obtain the compensation frame image, and the brightness of the original frame image and/or the compensation frame image is adjusted, so that the high-frame-rate image display is realized in a manner that the brightness of the original frame image and the brightness of the compensation frame image are different, adverse situations such as image breakage and jelly effect are not generated, the image quality of the image is ensured, and the cost of the compensation method is lower compared with that of the MEMC dynamic compensation manner.
In addition, it should be understood by those skilled in the art that although many problems exist in the prior art, each embodiment or technical solution of the present invention may be modified in only one or several respects, without having to solve all technical problems listed in the prior art or the background art at the same time. Those skilled in the art will understand that nothing in one claim should be taken as a limitation on that claim.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (8)
1. A compensation method for high frame rate image display is characterized in that: the compensation method for the high frame rate image display comprises the following steps:
receiving an original frame image according to a time sequence;
copying the original frame image to obtain a compensation frame image;
adjusting the brightness of the original frame image and/or the compensation frame image so that the brightness of the original frame image and the brightness of the compensation frame image are different;
and inserting the compensation frame image after the original frame image corresponding to the compensation frame image under the condition that the play interval of the original frame image is not changed.
2. The method for compensating for high frame rate image display according to claim 1, wherein: the adjusting the brightness of the original frame image and/or the compensation frame image comprises the following steps:
the brightness of the original frame image is kept unchanged, and the brightness of the compensation frame image is reduced to 40% -60% of the brightness of the original frame image.
3. The method for compensating for high frame rate image display according to claim 2, wherein: after the step of reducing the brightness of the compensation frame image is completed, the method further comprises the following steps:
and adjusting the gamma curve of the compensation frame image to enable the gamma curve to deviate to a low gray level area.
4. The method for compensating for high frame rate image display according to claim 3, wherein: the adjusting the gamma curve of the compensation frame image is through a histogram equalization method, and the adjusting the gamma curve through the histogram equalization method comprises the following steps:
converting the input compensation frame image into a corresponding gray level image;
calculating a histogram of the gray level image;
calculating a cumulative distribution function of the histogram;
calculating a new mapping value of the pixel value of the gray image using the cumulative distribution function, and replacing the original mapping value with the new mapping value;
and calculating the gamma curve of the adjusted compensation frame image.
5. The method of claim 4, wherein: the calculating the cumulative distribution function includes the steps of:
dividing the pixel value of the gray image into a preset number of gray scales, and calculating the number of pixel values in each gray scale;
normalizing the histogram, and dividing the number of pixel values of each gray scale number by the total number of pixels of the gray scale image to obtain the occurrence probability of each pixel value;
a cumulative distribution function of the normalized histogram is calculated, and for each pixel value, the sum of the occurrence probability thereof and the occurrence probability of the total pixel value is calculated.
6. The method for compensating for high frame rate image display according to claim 5, wherein: the formula for calculating the sum of the occurrence probabilities is: CDF (i) =sum (p (k)), where CDF (i) is the sum of the proportions of the pixel points whose pixel values are equal to or less than i in the input image, i and k are both pixel values, the value range of the pixel value k is 0 to i, and p (k) is the occurrence probability of the pixel value k.
7. A high frame rate image display apparatus based on the compensation method for high frame rate image display according to any one of claims 1 to 6, characterized in that: the device for displaying the high frame rate image comprises:
a receiving unit for receiving the original frame image in time sequence;
the copying unit is connected with the receiving unit and used for copying the original frame image to obtain a compensation frame image;
the adjusting unit is connected with the copying unit and is used for adjusting the brightness of the original frame image and/or the compensation frame image so as to enable the brightness of the original frame image and the brightness of the compensation frame image to be different;
and the inserting unit is connected with the adjusting unit and is used for inserting the compensation frame image after the original frame image corresponding to the compensation frame image under the condition that the playing interval of the original frame image is not changed.
8. A display module comprising a display panel and a driving device for driving the display panel, and further comprising the device for displaying high frame rate images according to claim 7, so as to perform frame rate compensation on display images of the display panel.
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| CN202310679818.XA CN116546332A (en) | 2023-06-08 | 2023-06-08 | Compensation method for high-frame-rate image display, high-frame-rate image display device and display module |
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