CN114793275A - Image signal processing method, device, terminal and storage medium - Google Patents
Image signal processing method, device, terminal and storage medium Download PDFInfo
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Abstract
The invention discloses an image signal processing method, an image signal processing device, a terminal and a storage medium. The problem that in the prior art, when the image signal contains the signal amplitude outside the standard amplitude interval of the signal processing system, the signal processing system can carry out amplitude limiting processing on the signal amplitude outside the standard amplitude interval, so that the television is difficult to completely display the image details corresponding to the image signal is solved.
Description
Technical Field
The present invention relates to the field of signal processing, and in particular, to a method, an apparatus, a terminal and a storage medium for processing an image signal.
Background
According to the specifications of the broadcast television transmission protocol, the transmission amplitude of the TV signal is as follows: the signal amplitude is 0% 100%, so the standard amplitude interval corresponding to the signal processing system of a television is also typically set to [ 0%, 100% ]. The signal processing system of the television can only normally process the signal amplitude in the standard amplitude interval, and when the image signal contains the signal amplitude outside the standard amplitude interval of the signal processing system, the signal processing system can perform amplitude limiting processing on the signal amplitude outside the standard amplitude interval, so that the television is difficult to completely display the image details corresponding to the image signal.
Thus, there is still a need for improvement and development of the prior art.
Disclosure of Invention
The present invention is to provide an image signal processing method, an image signal processing apparatus, a terminal and a storage medium, which aim to solve the problem that in the prior art, when an image signal contains a signal amplitude outside a standard amplitude interval of a signal processing system, the signal processing system may perform amplitude limiting processing on the signal amplitude outside the standard amplitude interval, which makes it difficult for a television to completely display image details corresponding to the image signal.
The technical scheme adopted by the invention for solving the problems is as follows:
in a first aspect, an embodiment of the present invention provides an image signal processing method, where the method includes:
acquiring an image signal, wherein the maximum signal amplitude and/or the minimum signal amplitude corresponding to the image signal are/is positioned outside a standard amplitude interval, and the standard amplitude interval is used for reflecting the signal amplitude range of a signal processing system corresponding to the image signal;
determining the amplitude of a signal to be adjusted in the image signal, wherein the amplitude of the signal to be adjusted is positioned outside a preset amplitude reserved interval, and the amplitude reserved interval is positioned within the standard amplitude interval;
and executing amplitude adjustment operation on each signal amplitude to be adjusted to obtain a target image signal corresponding to the image signal, wherein the signal amplitudes contained in the target image signal are all located in the standard amplitude interval.
In one embodiment, the performing an amplitude adjustment operation on the amplitude of the signal to be adjusted includes:
acquiring a target function corresponding to the image signal;
inputting the amplitude of each signal to be adjusted into the target function to obtain a target signal amplitude corresponding to the amplitude of each signal to be adjusted, wherein the target signal amplitude is located in the standard amplitude interval;
and executing the amplitude adjustment operation on each signal amplitude to be adjusted according to the target signal amplitude corresponding to each signal amplitude to be adjusted.
In one embodiment, when the minimum signal amplitude is outside the standard amplitude interval and the maximum signal amplitude is inside the standard amplitude interval, the maximum value of the amplitude retention interval is equal to the maximum value of the standard amplitude interval, the minimum value of the amplitude retention interval is greater than the minimum value of the standard amplitude interval, and the objective function is determined based on the correspondence between the minimum signal amplitude and the minimum value of the standard amplitude interval and the correspondence between the minimum value of the amplitude retention interval and itself.
In one embodiment, when the minimum signal amplitude is within the standard amplitude interval and the maximum signal amplitude is outside the standard amplitude interval, the minimum value of the amplitude retention interval is equal to the minimum value of the standard amplitude interval, the maximum value of the amplitude retention interval is smaller than the maximum value of the standard amplitude interval, and the objective function is determined based on the correspondence between the maximum signal amplitude and the maximum value of the standard amplitude interval and the correspondence between the maximum value of the amplitude retention interval and the objective function.
In one embodiment, when the minimum signal amplitude and the maximum signal amplitude are both outside the standard amplitude interval, the minimum value of the amplitude retention interval is greater than the minimum value of the standard amplitude interval, the maximum value of the amplitude retention interval is less than the maximum value of the standard amplitude interval, the objective function includes a first objective function and a second objective function, wherein the first objective function is determined based on the correspondence between the minimum signal amplitude and the minimum value of the standard amplitude interval and the correspondence between the minimum value of the amplitude retention interval and itself, the second objective function is determined based on the correspondence between the maximum signal amplitude and the maximum value of the standard amplitude interval and the correspondence between the maximum value of the amplitude retention interval and itself, and each of the signal amplitudes to be adjusted is input to the objective function, the method comprises the following steps:
when the amplitude of the signal to be adjusted is smaller than or equal to the minimum value of the amplitude retention interval, inputting the amplitude of the signal to be adjusted into the first objective function;
and when the amplitude of the signal to be adjusted is greater than or equal to the maximum value of the amplitude retention interval, inputting the amplitude of the signal to be adjusted into the second objective function.
In one embodiment, the objective function is a curvilinear function.
In one embodiment, the method further comprises the steps of:
and inputting the target image signal into the signal processing system to display a picture corresponding to the target image signal.
In a second aspect, an embodiment of the present invention further provides an image signal processing apparatus, where the apparatus includes:
the image processing system comprises an acquisition module, a processing module and a processing module, wherein the acquisition module is used for acquiring an image signal, and the maximum signal amplitude and/or the minimum signal amplitude corresponding to the image signal are/is positioned outside a standard amplitude interval which is used for reflecting the signal amplitude range of a signal processing system corresponding to the image signal;
the determining module is used for determining the amplitude of a signal to be adjusted in the image signal, wherein the amplitude of the signal to be adjusted is positioned outside a preset amplitude reserved interval, and the amplitude reserved interval is positioned within the standard amplitude interval;
and the adjusting module is used for executing amplitude adjusting operation on each signal amplitude to be adjusted to obtain a target image signal corresponding to the image signal, wherein the signal amplitude contained in the target image signal is within the standard amplitude interval.
In a third aspect, an embodiment of the present invention further provides a terminal, where the terminal includes a memory and one or more processors; the memory stores one or more programs; the program includes instructions for executing the image signal processing method as described in any of the above; the processor is configured to execute the program.
In a fourth aspect, the present invention further provides a computer-readable storage medium, on which a plurality of instructions are stored, wherein the instructions are adapted to be loaded and executed by a processor to implement any of the steps of the image signal processing method described above.
The invention has the beneficial effects that: according to the embodiment of the invention, the partial signal amplitude of the image signal of which the maximum signal amplitude/the minimum signal amplitude is not in the standard amplitude interval is adjusted, so that the adjusted image signal is input into a signal processing system and is not subjected to amplitude limiting processing. The problem that in the prior art, when the image signal contains the signal amplitude outside the standard amplitude interval of the signal processing system, the signal processing system can carry out amplitude limiting processing on the signal amplitude outside the standard amplitude interval, so that the television is difficult to completely display the image details corresponding to the image signal is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and it is also possible for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic flow chart of an image signal processing method according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a complete image detail after adjusting a signal amplitude greater than 100% by using the method of the present invention according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a complete image detail after adjusting a signal amplitude smaller than 0% by using the method of the present invention according to an embodiment of the present invention.
Fig. 4 is a schematic diagram illustrating that image details cannot be presented after signal amplitudes greater than 100% are clipped by the signal processing system according to an embodiment of the present invention.
Fig. 5 is a schematic diagram illustrating that image details cannot be presented after the signal amplitude less than 0% is clipped by the signal processing system according to the embodiment of the present invention.
Fig. 6 is a schematic diagram of the system operation provided by the embodiment of the present invention after the method of the present invention is added to the existing television system.
Fig. 7 is a diagram illustrating a standard amplitude interval of a conventional signal processing system according to an embodiment of the present invention.
Fig. 8 is a schematic diagram of an amplitude preservation interval and an objective function provided by an embodiment of the present invention.
Fig. 9 is a logic diagram of an operation of the image signal processing apparatus according to the embodiment of the present invention.
Fig. 10 is a schematic diagram of internal modules of an image signal processing apparatus according to an embodiment of the present invention.
Fig. 11 is a functional block diagram of a terminal according to an embodiment of the present invention.
Detailed Description
The present invention discloses an image signal processing method, an image signal processing apparatus, a terminal and a storage medium, and in order to make the purpose, technical solution and effect of the present invention clearer and clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As used herein, the singular forms "a", "an", "the" 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 in this specification, 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. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
According to the broadcast television transmission protocol, the transmission amplitude of the TV signal is: the signal amplitude is 0% or less and 100% or less, so the standard amplitude interval corresponding to the signal processing system of the television is also typically set to [ 0%, 100% ]. The signal processing system of the television can only normally process the signal amplitude in the standard amplitude interval, and when the image signal contains the signal amplitude outside the standard amplitude interval of the signal processing system, the signal processing system can perform amplitude limiting processing on the signal amplitude outside the standard amplitude interval, so that the television is difficult to completely display the image details corresponding to the image signal.
In view of the foregoing drawbacks of the prior art, the present invention provides an image signal processing method, which obtains an image signal, wherein a maximum signal amplitude and/or a minimum signal amplitude corresponding to the image signal are/is located outside a standard amplitude interval, and the standard amplitude interval is used for reflecting a signal amplitude range of a signal processing system corresponding to the image signal; determining the amplitude of a signal to be adjusted in the image signal, wherein the amplitude of the signal to be adjusted is positioned outside a preset amplitude reserved interval, and the amplitude reserved interval is positioned within the standard amplitude interval; and executing amplitude adjustment operation on the amplitude of each signal to be adjusted to obtain a target image signal corresponding to the image signal, wherein the signal amplitude contained in the target image signal is within the standard amplitude interval. The invention adjusts the partial signal amplitude of the image signal of which the maximum signal amplitude/the minimum signal amplitude is not in the standard amplitude interval, so that the adjusted image signal is input into a signal processing system and cannot be subjected to amplitude limiting processing. The problem that in the prior art, when the image signal contains the signal amplitude outside the standard amplitude interval of the signal processing system, the signal processing system can carry out amplitude limiting processing on the signal amplitude outside the standard amplitude interval, so that the television is difficult to completely display the image details corresponding to the image signal is solved.
As shown in fig. 1, the method comprises the steps of:
step S100, obtaining an image signal, wherein the maximum signal amplitude and/or the minimum signal amplitude corresponding to the image signal is located outside a standard amplitude interval, and the standard amplitude interval is used for reflecting the signal amplitude range of a signal processing system corresponding to the image signal.
Specifically, the image signal in this embodiment is a type of image signal that satisfies a specific condition, that is, the maximum value of the signal amplitude of the image signal is greater than the maximum value of a preset standard amplitude interval or the minimum value of the signal amplitude is less than the minimum value of the standard amplitude interval, where the system that processes the image signal is the signal processing system in this embodiment, and the standard amplitude interval is used to reflect the range of signal amplitudes that can be processed by the signal processing system. The signal processing system in the present embodiment has a clipping property (as shown in fig. 7), that is, it can effectively process only a signal amplitude lying within a standard amplitude interval, and when the signal amplitude of an image signal input to the signal processing system exceeds the standard amplitude interval, the image signal is difficult to be effectively processed. It should be emphasized that the image signal with all signal amplitudes within the standard amplitude interval is the standard image signal, and the standard image signal does not need to execute the image signal processing method corresponding to the present invention, and can be directly input into the signal processing system for signal processing.
For example, assuming that the signal processing system in this embodiment is applied to a television, the standard amplitude interval is [ 0%, 100% ], and the image signal a contains 107% of signal amplitude, as shown in fig. 4, when the input signal amplitude is greater than 100%, the television cannot display all details of the image, specifically, the "Super White" word cannot be displayed. The image signal B contains a signal amplitude of-7%, and as shown in fig. 5, when the input signal amplitude is less than 0%, the television cannot display all details of the image, specifically, the "Super Black" word cannot be displayed. Therefore, the image signal A, B is the processing target of the present invention, and the image signal processing method of the present invention needs to be performed before the image signal A, B is input to the signal processing system.
As shown in fig. 1, the method further comprises the steps of:
step S200, determining the amplitude of a signal to be adjusted in the image signal, wherein the amplitude of the signal to be adjusted is positioned outside a preset amplitude reserved interval, and the amplitude reserved interval is positioned within the standard amplitude interval.
When the present embodiment determines that the image signal has a signal amplitude exceeding the standard amplitude interval, in order to enable the signal amplitude to be input to a corresponding signal processing system for effective processing, the present embodiment needs to adjust a part of signal amplitudes in the image signal, where the part of signal amplitudes is the signal amplitude to be adjusted. Specifically, in the present embodiment, an amplitude reserved interval is set in advance in the standard amplitude interval, the signal amplitude in the amplitude reserved interval in the image signal remains unchanged, and the signal amplitude outside the amplitude reserved interval is used as the signal amplitude to be adjusted.
For example, assuming that the standard amplitude interval is [ 0%, 100% ], and the amplitude retention interval is (10%, 85%) and the image signal C includes signal amplitudes of 107% and-7%, the signal amplitudes less than or equal to 10% and greater than or equal to 85% in the image signal C are the signal amplitudes to be adjusted, and the signal amplitudes greater than 10% and less than 85% are maintained.
As shown in fig. 1, the method further comprises the steps of:
step S300, executing amplitude adjustment operation on each signal amplitude to be adjusted to obtain a target image signal corresponding to the image signal, wherein the signal amplitudes contained in the target image signal are all located in the standard amplitude interval.
Specifically, the number of the amplitudes of the signals to be adjusted in the image signal may be one or more, and since the amplitudes of the signals to be adjusted include signal amplitudes outside the standard amplitude interval, it is necessary to perform amplitude adjustment operation on each amplitude of the signals to be adjusted, and adjust all the amplitudes of the signals to be adjusted to the standard amplitude interval, so as to obtain a new image signal, that is, a target image signal. Since all the signal amplitudes contained in the target image signal are within the standard amplitude interval, the target image signal can be effectively processed after being input into the signal processing system.
In an implementation manner, the step S300 specifically includes the following steps:
s301, acquiring a target function corresponding to the image signal;
step S302, inputting the amplitude of each signal to be adjusted into the objective function to obtain a target signal amplitude corresponding to the amplitude of each signal to be adjusted, wherein the target signal amplitude is within the standard amplitude interval;
step S303, executing the amplitude adjustment operation on each signal amplitude to be adjusted according to a target signal amplitude corresponding to each signal amplitude to be adjusted.
Specifically, the amplitude adjustment operation in this embodiment is implemented based on an objective function, where each amplitude of the signal to be adjusted may be used as an input of the objective function, an output of the objective function is a target signal amplitude corresponding to each amplitude of the signal to be adjusted, the input of the objective function may be a signal amplitude outside a standard amplitude interval, but the output of the objective function is a signal amplitude within the standard amplitude interval. And aiming at each signal amplitude to be adjusted, performing amplitude adjustment operation on the signal amplitude to be adjusted according to the target signal amplitude corresponding to the signal amplitude to be adjusted, so that all signal amplitudes of the image signal can be adjusted to be within a standard amplitude interval.
In one implementation, when the minimum signal amplitude is outside the standard amplitude interval and the maximum signal amplitude is inside the standard amplitude interval, the maximum value of the amplitude retention interval is equal to the maximum value of the standard amplitude interval, the minimum value of the amplitude retention interval is greater than the minimum value of the standard amplitude interval, and the objective function is determined based on the correspondence between the minimum signal amplitude and the minimum value of the standard amplitude interval and the correspondence between the minimum value of the amplitude retention interval and itself.
Specifically, the image signal in the present embodiment may be an image signal in which the minimum signal amplitude is outside the standard amplitude interval and the maximum signal amplitude is within the standard amplitude interval. It is understood that since the minimum signal amplitude of the image signal is outside the standard amplitude interval, the signal amplitude range from the minimum signal amplitude to the minimum value of the standard amplitude interval in the image signal is difficult to be efficiently processed by the signal processing system. For this case, the present embodiment sets the maximum value of the amplitude retention interval to the maximum value of the standard amplitude interval, and sets the minimum value of the amplitude retention interval to be larger than the minimum value of the standard amplitude interval. The minimum value of the amplitude retention interval mainly depends on the requirement of the user on the image quality. The higher the requirement of the user on the image quality is, the closer the minimum value of the amplitude retention interval is to the minimum value of the standard amplitude interval; the lower the user's request for image quality, the farther the minimum value of the amplitude retention interval is from the minimum value of the standard amplitude interval. It follows that, in addition to the signal amplitudes lying outside the standard amplitude interval in the image signal, also the signal amplitudes lying partly within the standard amplitude interval need to be adjusted. For the case that the minimum signal amplitude of the image signal is outside the standard amplitude interval and the maximum signal amplitude is inside the standard amplitude interval, the objective function in this embodiment needs to satisfy two input-output relationships, the first is that when the minimum signal amplitude of the image signal is used as the input of the objective function, the output of the objective function is the minimum value of the standard amplitude interval; the second is that when the minimum of the amplitude-preserving interval is used as input to the objective function, the output of the objective function is the minimum of the amplitude-preserving interval itself.
For example, as shown in fig. 8, the abscissa of the graph is the input of the objective function, and the ordinate is the output of the objective function. Assuming that the standard amplitude interval is [ 0%, 100% ], the minimum signal amplitude of the image signal is less than 0%, the coordinates of the point D are (Xd, Yd), the coordinates of the point C are (Xc, Yc), then Xd is the minimum signal amplitude of the image signal, Yd is the minimum value of the standard amplitude interval, Xc and Yc are the minimum values of the amplitude retention interval, the range between the point C and the point D is the signal amplitude to be adjusted, and the range above the point C retains the original signal amplitude. It can be seen from the figure that both the data points C and D satisfy the functional relationship of the objective function, so that the specific formula of the objective function can be determined based on the data points C and D:
in another implementation manner, when the minimum signal amplitude is within the standard amplitude interval and the maximum signal amplitude is outside the standard amplitude interval, the minimum value of the amplitude retention interval is equal to the minimum value of the standard amplitude interval, the maximum value of the amplitude retention interval is smaller than the maximum value of the standard amplitude interval, and the objective function is determined based on the correspondence between the maximum signal amplitude and the maximum value of the standard amplitude interval and the correspondence between the maximum value of the amplitude retention interval and the objective function.
Specifically, the image signal in the present embodiment may be an image signal in which the minimum signal amplitude is within the standard amplitude interval and the maximum signal amplitude is outside the standard amplitude interval. It is understood that since the maximum signal amplitude of the image signal is outside the standard amplitude interval, the signal amplitude range from the maximum signal amplitude in the image signal to the maximum value in the standard amplitude interval is difficult to be efficiently processed by the signal processing system. For this case, the present embodiment sets the minimum value of the amplitude retention interval to the minimum value of the standard amplitude interval, and the maximum value of the amplitude retention interval to be smaller than the maximum value of the standard amplitude interval. The maximum value of the amplitude retention interval mainly depends on the requirement of the user on the image quality. The higher the requirement of the user on the image quality is, the closer the maximum value of the amplitude retention interval is to the maximum value of the standard amplitude interval; the lower the user's request for image quality, the farther the maximum value of the width reservation section is from the maximum value of the standard width section. It follows that, in addition to the signal amplitudes lying outside the standard amplitude interval in the image signal, also the signal amplitudes lying partly within the standard amplitude interval need to be adjusted. For the case where the minimum signal amplitude of the image signal is within the standard amplitude interval and the maximum signal amplitude is outside the standard amplitude interval, the objective function in the present embodiment needs to satisfy two input-output relationships, the first being when the maximum signal amplitude of the image signal is taken as the input of the objective function, the output of the objective function is the maximum value of the standard amplitude interval; the second is that when the maximum value of the amplitude-preserving interval is taken as input to the objective function, the output of the objective function is the maximum value of the amplitude-preserving interval itself.
For example, as shown in fig. 8, the abscissa of the graph is the input of the objective function, and the ordinate is the output of the objective function. Assuming that the standard amplitude interval is [ 0%, 100% ], the maximum signal amplitude of the image signal is greater than 100%, the coordinates of the point a are (Xa, Ya), the coordinates of the point C are (Xb, Yb), Xa and Ya are the maximum values of the amplitude retention interval, Xb is the maximum signal amplitude of the image signal, Yb is the maximum value of the standard amplitude interval, the range between the point a and the point B is the signal amplitude to be adjusted, and the range below the point a retains the original signal amplitude. It can be seen from the figure that both the data points a and B satisfy the functional relationship of the objective function, so that the specific formula of the objective function can be determined based on the data points a and B:
in one implementation, when the minimum signal amplitude and the maximum signal amplitude are both outside the standard amplitude interval, the minimum value of the amplitude retention interval is greater than the minimum value of the standard amplitude interval, the maximum value of the amplitude retention interval is less than the maximum value of the standard amplitude interval, the objective function includes a first objective function and a second objective function, wherein the first objective function is determined based on the correspondence between the minimum signal amplitude and the minimum value of the standard amplitude interval and the correspondence between the minimum value of the amplitude retention interval and itself, the second objective function is determined based on the correspondence between the maximum signal amplitude and the maximum value of the standard amplitude interval and the correspondence between the maximum value of the amplitude retention interval and itself, and each of the signal amplitudes to be adjusted is input to the objective function, the method comprises the following steps:
step S3021, when the amplitude of the signal to be adjusted is smaller than or equal to the minimum value of the amplitude retention interval, inputting the amplitude of the signal to be adjusted into the first objective function;
and step S3023, when the amplitude of the signal to be adjusted is greater than or equal to the maximum value of the amplitude retention interval, inputting the amplitude of the signal to be adjusted into the second objective function.
Specifically, the image signal in the present embodiment may also be an image signal in which the minimum signal amplitude is located outside the standard amplitude interval and the maximum signal amplitude is also located outside the standard amplitude interval. It can be understood that, since the maximum signal amplitude and the minimum signal amplitude of the image signal are both outside the standard amplitude interval, the signal amplitude range between the maximum signal amplitude in the image signal and the maximum value in the standard amplitude interval, and the signal amplitude range between the minimum signal amplitude and the minimum value in the standard amplitude interval are difficult to be effectively processed by the signal processing system. For this case, the present embodiment sets the minimum value of the amplitude retention section to be larger than the minimum value of the standard amplitude section, and the maximum value of the amplitude retention section to be smaller than the maximum value of the standard amplitude section. The maximum value/the minimum value of the amplitude retention interval mainly depends on the requirement of a user on the image quality. The higher the requirement of the user on the image quality is, the closer the maximum value of the amplitude retention interval is to the maximum value of the standard amplitude interval/the closer the minimum value of the amplitude retention interval is to the minimum value of the standard amplitude interval; the lower the user's request for image quality, the farther the maximum value of the width holding interval is from the maximum value of the standard width interval/the farther the minimum value of the width holding interval is from the minimum value of the standard width interval. It follows that, in addition to the signal amplitudes outside the standard amplitude interval in the image signal, the signal amplitudes partially within the standard amplitude interval need to be adjusted. It is understood that, for the case where the minimum signal amplitude of the image signal is located outside the standard amplitude interval and the maximum signal amplitude is also located outside the standard amplitude interval, the signal amplitude to be adjusted in the present embodiment will be divided into two categories, the first category being the signal amplitude to be adjusted which is greater than or equal to the maximum value of the amplitude retention interval, and the second category being the signal amplitude to be adjusted which is less than or equal to the minimum value of the amplitude retention interval. Aiming at the amplitude of a first type of signal to be adjusted, a corresponding target function is a first target function, wherein the first target function needs to satisfy two input and output relations, and the first one is that when the maximum signal amplitude of an image signal is used as the input of the target function, the output of the target function is the maximum value of a standard amplitude interval; the second is when the maximum value of the amplitude-preserving interval is taken as input to the objective function, the output of the objective function is the maximum value of the amplitude-preserving interval itself. Aiming at the amplitude of a second type of signal to be adjusted, a corresponding target function is a second target function, wherein the second target function needs to satisfy two input and output relations, and the first one is that when the minimum signal amplitude of an image signal is used as the input of the target function, the output of the target function is the minimum value of a standard amplitude interval; the second is when the minimum of the amplitude-preserving interval is used as input to the objective function, the output of the objective function is the minimum of the amplitude-preserving interval itself. And inputting the amplitude of the first type of signal to be adjusted into a first objective function to obtain the corresponding target signal amplitude, and inputting the amplitude of the second type of signal to be adjusted into a second objective function to obtain the corresponding target signal amplitude. Because the outputs of the first objective function and the second objective function are both located in the standard amplitude interval, after amplitude adjustment operation is performed on each signal amplitude to be adjusted based on the corresponding target signal amplitude, all signal amplitudes in the image signal are located in the standard amplitude interval, and the target image signal is obtained.
For example, as shown in fig. 8, the abscissa is the input of the objective function and the ordinate is the output of the objective function. Assuming that the standard amplitude interval is [ 0%, 100% ], the maximum signal amplitude of the image signal is greater than 100%, the signal amplitude to be adjusted is in the range between the points A and B and the range between the points C and D, and the original signal amplitude is reserved in the range between the points A and C. It can be seen from the figure that both the data points of point C and point D satisfy the functional relationship of the first objective function, and both the data points of point a and point B satisfy the second functional relationship of the second objective function, so that the specific formula of the first objective function can be determined based on point C and point D, and the specific formula of the second objective function can be determined based on point a and point B:
in one implementation, the objective function is a curvilinear function.
Specifically, the objective function in this embodiment is a curve function, that is, the objective function appears as a curve on a plane rectangular coordinate system. As shown in fig. 8, in the range from point C to point D, the output of the objective function gradually reaches the minimum value of the standard amplitude interval as the input of the objective function decreases. Similarly, in the range from point a to point B in the graph, as the input of the objective function increases, the output of the objective function smoothly reaches the maximum value of the standard amplitude interval. The embodiment adopts the curve function as the objective function, and can be compatible with a brighter picture/a darker picture, and show more highlight details/dark field details.
In one implementation, the algorithm for generating the objective function may be any one of a linear algorithm, a gaussian algorithm, and a cubic spline difference algorithm.
In one implementation, the method further comprises the steps of:
and step S10, inputting the target image signal into the signal processing system to display a picture corresponding to the target image signal.
Specifically, since all signal amplitudes of the target image signal are within the standard amplitude interval, the target image signal can be effectively processed by the signal processing system after being input into the signal processing system. As shown in fig. 6, the processed signal output by the signal processing system enters the brightness, contrast, and Gamma correlation module, and the signal output by the brightness, contrast, and Gamma correlation module acts on the screen to display a picture corresponding to the target image signal, where the picture may display image details corresponding to the target image signal, and as shown in fig. 2 and fig. 3, the "Super White" and "Super Black" characters may be completely presented.
Based on the above embodiment, the present invention also provides an image signal processing apparatus, as shown in fig. 10, the apparatus including:
the acquisition module 01 is configured to acquire an image signal, where a maximum signal amplitude and/or a minimum signal amplitude corresponding to the image signal are located outside a standard amplitude interval, and the standard amplitude interval is used to reflect a signal amplitude range of a signal processing system corresponding to the image signal;
a determining module 02, configured to determine an amplitude of a signal to be adjusted in the image signal, where the amplitude of the signal to be adjusted is located outside a preset amplitude-reserved interval, and the amplitude-reserved interval is located within the standard amplitude interval;
the adjusting module 03 is configured to perform amplitude adjustment operation on each amplitude of the signal to be adjusted to obtain a target image signal corresponding to the image signal, where signal amplitudes included in the target image signal are all located within the standard amplitude interval.
In one implementation, the operating logic of the image signal processing apparatus is as shown in fig. 9.
Based on the above embodiment, the present invention further provides a terminal, and a functional block diagram of the terminal may be as shown in fig. 11. The terminal comprises a processor, a memory, a network interface and a display screen which are connected through a system bus. Wherein the processor of the terminal is configured to provide computing and control capabilities. The memory of the terminal comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operating system and the computer program to run on the non-volatile storage medium. The network interface of the terminal is used for connecting and communicating with an external terminal through a network. The computer program is executed by a processor to implement the image signal processing method. The display screen of the terminal can be a liquid crystal display screen or an electronic ink display screen.
It will be understood by those skilled in the art that the block diagram of fig. 11 is only a block diagram of a portion of the structure associated with the inventive arrangements, and does not limit the terminals to which the inventive arrangements are applied, and a particular terminal may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one implementation, one or more programs are stored in a memory of the terminal and configured to be executed by one or more processors include instructions for performing an image signal processing method.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above may be implemented by hardware instructions of a computer program, which may be stored in a non-volatile computer-readable storage medium, and when executed, may include the processes of the embodiments of the methods described above. Any reference to memory, storage, databases or other media used in the embodiments provided herein may include non-volatile and/or volatile memory. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
In summary, the present invention discloses an image signal processing method, an apparatus, a terminal, and a storage medium, where the method obtains an image signal, where a maximum signal amplitude and/or a minimum signal amplitude corresponding to the image signal are located outside a standard amplitude interval, and the standard amplitude interval is used to reflect a signal amplitude range of a signal processing system corresponding to the image signal; determining the amplitude of a signal to be adjusted in the image signal, wherein the amplitude of the signal to be adjusted is positioned outside a preset amplitude reserved interval, and the amplitude reserved interval is positioned within the standard amplitude interval; and executing amplitude adjustment operation on the amplitude of each signal to be adjusted to obtain a target image signal corresponding to the image signal, wherein the signal amplitude contained in the target image signal is within the standard amplitude interval. The invention adjusts the partial signal amplitude of the image signal of which the maximum signal amplitude/the minimum signal amplitude is not in the standard amplitude interval, so that the adjusted image signal is input into a signal processing system and cannot be subjected to amplitude limiting processing. The problem that in the prior art, when the image signal contains the signal amplitude outside the standard amplitude interval of the signal processing system, the signal processing system can carry out amplitude limiting processing on the signal amplitude outside the standard amplitude interval, so that the television is difficult to completely display the image details corresponding to the image signal is solved.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (10)
1. An image signal processing method, characterized in that the method comprises:
acquiring an image signal, wherein the maximum signal amplitude and/or the minimum signal amplitude corresponding to the image signal are/is positioned outside a standard amplitude interval, and the standard amplitude interval is used for reflecting the signal amplitude range of a signal processing system corresponding to the image signal;
determining the amplitude of a signal to be adjusted in the image signal, wherein the amplitude of the signal to be adjusted is positioned outside a preset amplitude reserved interval, and the amplitude reserved interval is positioned within the standard amplitude interval;
and executing amplitude adjustment operation on each signal amplitude to be adjusted to obtain a target image signal corresponding to the image signal, wherein the signal amplitudes contained in the target image signal are all located in the standard amplitude interval.
2. The image signal processing method according to claim 1, wherein the performing an amplitude adjustment operation on the amplitude of the signal to be adjusted comprises:
acquiring a target function corresponding to the image signal;
inputting the amplitude of each signal to be adjusted into the target function to obtain a target signal amplitude corresponding to the amplitude of each signal to be adjusted, wherein the target signal amplitude is located in the standard amplitude interval;
and executing the amplitude adjustment operation on each signal amplitude to be adjusted according to the target signal amplitude corresponding to each signal amplitude to be adjusted.
3. The image signal processing method according to claim 2, wherein when the minimum signal amplitude is outside the standard amplitude interval and the maximum signal amplitude is inside the standard amplitude interval, a maximum value of the amplitude retention interval is equal to a maximum value of the standard amplitude interval, a minimum value of the amplitude retention interval is larger than a minimum value of the standard amplitude interval, and the objective function is determined based on a correspondence between the minimum signal amplitude and the minimum value of the standard amplitude interval and a correspondence of the minimum value of the amplitude retention interval to itself.
4. The image signal processing method according to claim 2, wherein when the minimum signal amplitude is within the standard amplitude interval and the maximum signal amplitude is outside the standard amplitude interval, a minimum value of the amplitude retention interval is equal to a minimum value of the standard amplitude interval, a maximum value of the amplitude retention interval is smaller than a maximum value of the standard amplitude interval, and the objective function is determined based on a correspondence between the maximum signal amplitude and the maximum value of the standard amplitude interval and a correspondence of the maximum value of the amplitude retention interval to itself.
5. The image signal processing method according to claim 2, wherein when the minimum signal amplitude and the maximum signal amplitude are both outside the standard amplitude interval, a minimum value of the amplitude retention interval is larger than a minimum value of the standard amplitude interval, a maximum value of the amplitude retention interval is smaller than a maximum value of the standard amplitude interval, the objective function includes a first objective function and a second objective function, wherein the first objective function is determined based on a correspondence between the minimum signal amplitude and the minimum value of the standard amplitude interval and a correspondence between the minimum value of the amplitude retention interval and itself, the second objective function is determined based on a correspondence between the maximum signal amplitude and the maximum value of the standard amplitude interval and a correspondence between the maximum value of the amplitude retention interval and itself, the step of inputting each amplitude of the signal to be adjusted into the objective function comprises the following steps:
when the amplitude of the signal to be adjusted is smaller than or equal to the minimum value of the amplitude retention interval, inputting the amplitude of the signal to be adjusted into the first objective function;
and when the amplitude of the signal to be adjusted is greater than or equal to the maximum value of the amplitude retention interval, inputting the amplitude of the signal to be adjusted into the second objective function.
6. The image signal processing method according to claim 2, wherein the objective function is a curve function.
7. The image signal processing method according to claim 1, characterized by further comprising the steps of:
and inputting the target image signal into the signal processing system to display a picture corresponding to the target image signal.
8. An image signal processing apparatus characterized in that the apparatus comprises:
the image processing system comprises an acquisition module, a processing module and a processing module, wherein the acquisition module is used for acquiring an image signal, and the maximum signal amplitude and/or the minimum signal amplitude corresponding to the image signal are/is positioned outside a standard amplitude interval which is used for reflecting the signal amplitude range of a signal processing system corresponding to the image signal;
the determining module is used for determining the amplitude of a signal to be adjusted in the image signal, wherein the amplitude of the signal to be adjusted is positioned outside a preset amplitude reserved interval, and the amplitude reserved interval is positioned within the standard amplitude interval;
and the adjusting module is used for executing amplitude adjusting operation on each signal amplitude to be adjusted to obtain a target image signal corresponding to the image signal, wherein the signal amplitude contained in the target image signal is within the standard amplitude interval.
9. A terminal, comprising a memory and one or more processors; the memory stores one or more programs; the program includes instructions for executing the image signal processing method according to any one of claims 1 to 7; the processor is configured to execute the program.
10. A computer-readable storage medium having stored thereon a plurality of instructions, wherein the instructions are adapted to be loaded and executed by a processor to implement the steps of the image signal processing method according to any one of claims 1 to 7.
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