WO2016157838A1 - 信号処理装置、表示装置、信号処理方法、およびプログラム - Google Patents
信号処理装置、表示装置、信号処理方法、およびプログラム Download PDFInfo
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Definitions
- the present disclosure relates to a signal processing device, a display device, a signal processing method, and a program for processing a video signal in accordance with a standard that handles a wider range than a standard dynamic range (hereinafter referred to as a standard that handles HDR (High Dynamic Range)).
- a standard that handles HDR High Dynamic Range
- Patent Document 1 discloses a playback device that transmits HDR data and HDR information to the monitor in order to make use of the performance of the monitor having a wider dynamic range (luminance range) than the standard.
- the monitor adjusts the HDR data based on the HDR information and displays a video that matches the characteristics of the monitor itself.
- HDR data may be sent to a monitor having a standard dynamic range.
- HDR data is a video signal that exceeds the displayable brightness of a standard monitor.
- black floating occurs in the low-brightness area (black brightness appears to increase), and the brightness is insufficient in the high-brightness area, resulting in a decrease in contrast. There is a risk of degrading the image quality.
- the present disclosure provides a signal processing device, a display device, a signal processing method, and a program that suppress deterioration in image quality even when a video signal exceeding the capability of the monitor is input to the monitor.
- the signal processing device in the present disclosure is a signal processing device that outputs a video signal to a display unit.
- the signal processing device includes a conversion unit and a selection unit.
- the conversion unit converts the input video signal into an output video signal for a low-brightness display device having a lower upper limit of the displayable luminance range than the high-brightness display device.
- the selection unit receives the input video signal and the output video signal, selects one of the input video signal and the output video signal, and outputs the selected signal to the display unit.
- the selection unit selects the output video signal when the high luminance flag indicating that the video signal is for the high luminance display device is added to the input video signal, and the high luminance flag is added to the input video signal. If not, the input video signal is selected.
- the signal processing method in the present disclosure is a signal processing method for outputting a video signal to the display unit.
- the signal processing method includes the steps of converting an input video signal into an output video signal for a low-brightness display device having a lower upper limit of the displayable luminance range than the high-brightness display device, and the input video signal and the output video signal
- the output video signal is output to the display unit. Is selected and the high luminance flag is not added to the input video signal, the input video signal is selected.
- the video processing device, the display device, the signal processing method, and the program according to the present disclosure can suppress deterioration in image quality even when a video signal exceeding the monitor capability is input to the monitor.
- FIG. 1 is a block diagram schematically illustrating a configuration example of the display device according to the first embodiment.
- FIG. 2 is a block diagram schematically showing a configuration example of the HDR / SDR conversion unit in the first embodiment.
- FIG. 3 is a graph showing an example of the first conversion characteristic curve in the first embodiment.
- FIG. 4 is a graph showing an example of the second conversion characteristic curve in the first embodiment.
- FIG. 5 is a diagram for illustrating a theory for creating the first conversion characteristic curve in the first embodiment.
- FIG. 6 is a block diagram schematically showing a configuration example of the parameter calculation unit in the first embodiment.
- FIG. 7 is a graph showing an example of the relationship between gain information and maximum luminance in the first embodiment.
- FIG. 8 is a flowchart showing an example of a signal processing method executed by the tuner unit in the first embodiment.
- FIG. 9 is a block diagram schematically illustrating a configuration example of the display device according to the second embodiment.
- FIG. 10 is a block diagram schematically showing a configuration example of the analysis information detection unit in the second embodiment.
- FIG. 11 is a diagram for explaining the luminance histogram in the second embodiment.
- FIG. 12 is a graph showing an example of the relationship between gain information and maximum luminance in the second embodiment.
- FIG. 13 is a block diagram schematically showing a configuration example of the parameter calculation unit in the second embodiment.
- FIG. 14 is a graph showing an example of the relationship between motion vector gain information and motion vectors in the second embodiment.
- FIG. 15 is a flowchart illustrating an example of a signal processing method executed by the tuner unit according to the second embodiment.
- FIG. 1 is a block diagram schematically showing a configuration example of the display device 1 according to the first embodiment.
- the display device 1 is, for example, a television set (hereinafter referred to as “TV”) that displays video by receiving broadcast waves.
- the display device 1 includes a display unit 2 and a tuner unit 3.
- the display unit 2 and the tuner unit 3 are connected to each other so as to communicate with each other.
- FIG. 1 shows only the components related to the present embodiment among the plurality of components included in the display device 1, and other components are omitted.
- Other components include components that are typically provided in televisions. Those explanations are omitted.
- the display unit 2 receives the video signal sent from the tuner unit 3 and displays a video based on the video signal.
- Examples of the display unit 2 include a liquid crystal display panel and an organic EL (Electro Luminescence) display panel.
- the display unit 2 has a displayable luminance range (dynamic range). Here, the display unit 2 capable of displaying with a standard dynamic range is illustrated.
- a dynamic range larger than the standard dynamic range is expressed as a range of 101% or more. In the case of a dynamic range conforming to a standard that handles HDR, the range is about 0 to 10,000%.
- a video signal compliant with the HDR handling standard is used as a video signal for a high luminance display device, and a video signal corresponding to a standard dynamic range is used as a video signal for a low luminance display device.
- the high-brightness display device is a display device that can display a dynamic range larger than the standard dynamic range.
- the high-brightness display device is a display device that can display a video signal that conforms to a standard that handles HDR.
- the low-brightness display device is a display device having a lower upper limit of displayable luminance than the high-brightness display device, and is a display device that can display a video signal corresponding to a standard dynamic range, for example.
- the tuner unit 3 is a signal processing device that converts a broadcast wave input via an antenna into a video signal and outputs the video signal to the display unit 2.
- the tuner unit 3 is realized as a one-chip semiconductor integrated circuit such as an LSI (Large Scale Integrated Circuit).
- the tuner unit 3 includes a reception unit 31, a conversion unit 32, and a selection unit 33.
- the receiving unit 31, the converting unit 32, and the selecting unit 33 may be realized by a plurality of integrated circuits, or may be realized by a plurality of individual circuits or discrete components.
- the receiving unit 31 is a circuit that converts a broadcast wave input via an antenna into an input video signal.
- the dynamic range information indicating the type of the dynamic range of the video according to the input video signal is added to the input video signal. For example, when the input video signal is a video signal for a high brightness display device, an HDR flag (high brightness flag) is added to the input video signal as dynamic range information. On the other hand, when the input video signal is a video signal for a low luminance display device, a SDR (Standard Dynamic Range) flag (low luminance flag) is added to the input video signal as dynamic range information. Further, additional information is added in advance to the input video signal.
- an HDR flag high brightness flag
- SDR Standard Dynamic Range
- the additional information includes a value related to the luminance of the input video signal.
- the value relating to the luminance of the input video signal the maximum luminance within one frame of the input video signal, the average luminance within one frame of the input video signal, and the predetermined number of frames of the input video signal. Examples include an average maximum luminance per frame calculated from the maximum luminance, a luminance histogram within one frame of the input video signal, and a motion vector per unit pixel block included in the input video signal.
- the maximum luminance within one frame of the input video signal is added to the input video signal for each frame will be described as an example of additional information.
- additional information may be added to the entire input video signal constituting one content.
- at least one of the average values of the maximum luminance, average luminance, luminance histogram, and motion vector obtained from all frames constituting one content may be used as additional information.
- the receiving unit 31 outputs the additional information added to the input video signal to the parameter calculating unit 322 of the converting unit 32. In addition, the reception unit 31 outputs the input video signal to the selection unit 33 and the HDR / SDR conversion unit 321 of the conversion unit 32. In addition, the receiving unit 31 outputs the dynamic range information added to the input video signal to the selection unit 33.
- the conversion unit 32 converts an input video signal including a video signal for a high luminance display device into a video signal for a low luminance display device having a lower upper limit of the displayable luminance range than the high luminance display device and outputs the video signal.
- This is a circuit for creating a video signal.
- the conversion unit 32 includes an HDR / SDR conversion unit 321 and a parameter calculation unit 322.
- the HDR / SDR conversion unit 321 is a circuit that generates an output video signal by performing a luminance conversion process on the input video signal using the parameter calculated by the parameter calculation unit 322.
- FIG. 2 is a block diagram schematically showing a configuration example of the HDR / SDR conversion unit 321 in the first embodiment.
- the HDR / SDR conversion unit 321 includes a first gradation conversion unit 37, a second gradation conversion unit 38, and a synthesis unit 39.
- the first gradation conversion unit 37 is a circuit that converts the luminance of the input video signal using the first conversion characteristic curve C1 (see FIG. 3).
- the first gradation converting unit 37 outputs the converted first converted video signal to the combining unit 39.
- the second gradation conversion unit 38 is a circuit that converts the luminance of the input video signal using the second conversion characteristic curve C2 (see FIG. 4).
- the second gradation conversion unit 38 outputs the converted second converted video signal to the synthesis unit 39.
- FIG. 3 is a graph showing an example of the first conversion characteristic curve C1 in the first embodiment.
- FIG. 4 is a graph showing an example of the second conversion characteristic curve C2 in the first embodiment.
- the first conversion characteristic curve C1 and the second conversion characteristic curve C2 are examples, and can be changed within a range suitable for the purpose of luminance conversion.
- the horizontal axis indicates the luminance of the input video signal
- the vertical axis indicates the luminance of the output video signal after conversion.
- the limiter position on the vertical axis is the upper limit value of the dynamic range that can be displayed on the display unit 2.
- FIG. 5 is a diagram for illustrating a theory for creating the first conversion characteristic curve C1 in the first embodiment.
- the horizontal axis represents the luminance of the input video signal
- the vertical axis represents the luminance of the output video signal.
- the input video signal has already been corrected by OETF (Optical-Electronic Transfer Function).
- OETF Optical-Electronic Transfer Function
- EOTF Electro-Optical Transfer Function
- An example of this EOTF (referred to as HDR-EOTF in FIG. 5) is shown in FIG.
- FIG. 5 (b) is an example of a supplemental graph in accordance with the upper limit value of the dynamic range that can be displayed on the display unit 2.
- an OETF corresponding to the EOTF expected by the display unit 2 is prepared.
- An example of this OETF (referred to as SDR-OETF in FIG. 5) is shown in FIG.
- the first conversion characteristic curve C1 shown in FIG. 5 (d) is calculated by multiplying the graphs shown in FIGS. 5 (a) to (c).
- FIG. 5D as a comparative example, a conversion characteristic curve C3 when an input video signal that conforms to a standard that handles HDR is displayed on a display unit that complies with the standard that handles HDR is shown.
- the conversion characteristic curve C3 is a linear graph as a whole.
- the first conversion characteristic curve C1 is a graph having a non-linear part and a linear part.
- the linear portion of the first conversion table C1 is a horizontal line segment based on the value of the limiter position.
- This linear part of the first conversion characteristic curve C1 is a signal that has a luminance exceeding the limiter position (the upper limit value of the displayable luminance range of the display unit 2) in the input video signal. This is a part to be converted into the brightness of a nearby value. As a result, the input video signal having the luminance exceeding the limiter position is converted into the upper limit value of the dynamic range that can be displayed on the display unit 2 by the linear unit. Note that the value after conversion in the linear part may not be the same value as the value of the limiter position, but may be a value in the vicinity thereof.
- the non-linear part of the first conversion characteristic curve C1 is a part that converts the luminance of a signal that falls within the dynamic range (luminance range) that can be displayed on the display unit 2 of the input video signal based on a predetermined standard.
- the predetermined standard is a standard based on the dynamic range of the video based on the input video signal and the dynamic range that can be displayed on the display unit 2. Specifically, as described above, the standard is obtained by synthesizing the three graphs shown in FIGS. 5A to 5C.
- the predetermined standard is not limited to this, and a standard obtained by various experiments or simulations may be used.
- the pseudo-contour and white crush A converted video signal that may contain a high-luminance portion in the display video is lost.
- the second conversion characteristic curve C2 is a graph having no horizontal linear portion as shown in FIG.
- the second conversion characteristic curve C2 only the upper limit value of the luminance range of the input video signal is converted into the limiter position value.
- the luminance of the input video signal is reduced so as to be within the dynamic range (luminance range) that can be displayed on the display unit 2, and converted into an output video signal.
- the combining unit 39 combines the first converted video signal input from the first gradation conversion unit 37 and the second converted video signal input from the second gradation conversion unit 38.
- This is a circuit that synthesizes at a predetermined ratio (hereinafter also referred to as a use ratio) and outputs the combined signal to the selection unit 33 as an output video signal.
- the synthesis unit 39 sets the parameters input from the parameter calculation unit 322 to a predetermined ratio, and creates an output video signal according to the following Expression 1.
- Output video signal first converted video signal ⁇ (1 ⁇ parameter) + second converted video signal ⁇ parameter (Equation 1)
- the parameter calculation unit 322 is a circuit that calculates a parameter for converting an input video signal.
- the parameter calculation unit 322 calculates a parameter based on the additional information input from the reception unit 31.
- the parameter is a use ratio of the first conversion characteristic curve C1 and the second conversion characteristic curve C2 used in the synthesis unit 39.
- the parameter is a ratio between the first converted video signal based on the first conversion characteristic curve C1 and the second converted video signal based on the second conversion characteristic curve C2 when they are combined. It is.
- FIG. 6 is a block diagram schematically showing a configuration example of the parameter calculation unit 322 in the first embodiment.
- the parameter calculation unit 322 includes a gain calculation unit 35 and a time constant processing unit 36.
- the gain calculation unit 35 is a circuit that calculates gain information based on the maximum luminance input as additional information from the reception unit 31. Specifically, the gain calculation unit 35 calculates gain information from the maximum luminance by using a first threshold, a second threshold larger than the first threshold, and the following graph.
- FIG. 7 is a graph showing an example of the relationship between the gain information and the maximum luminance in the first embodiment.
- the gain calculation unit 35 sets the gain information to “0” when the maximum luminance is equal to or less than the first threshold value T1, and sets the gain information when the maximum luminance is equal to or greater than the second threshold value T2.
- the information is “1”.
- the graph shown in FIG. 7 is a linear graph connecting “0” and “1” between the first threshold value T1 and the second threshold value T2. Therefore, when the maximum luminance is between the first threshold value T1 and the second threshold value T2, the gain calculation unit 35 uses the value based on the linear portion L as gain information. This value is a predetermined ratio.
- the first threshold value T1 and the second threshold value T2 are set to appropriate values based on various experiments, simulations, and the like.
- the first threshold value T1 may be a value that is about the upper limit value of the dynamic range that can be displayed on the display unit 2.
- the second threshold T2 only needs to be larger than the first threshold T1.
- the time constant processing unit 36 calculates a parameter to be used next based on the current gain information calculated by the gain calculation unit 35 and the parameter used immediately before, and calculates the calculated parameter. Is output to the HDR / SDR converter 321. Specifically, the time constant processing unit 36 calculates a parameter from the following formula 2, for example.
- Parameter calculated gain information ⁇ ⁇ + parameter used immediately before ⁇ (1- ⁇ ) (Expression 2)
- ⁇ is a weighting coefficient and satisfies the following relationship. 0 ⁇ ⁇ ⁇ 1.
- ⁇ is set to an appropriate value based on various experiments and simulations.
- the selection unit 33 receives an input video signal, an output video signal obtained by converting the input video signal by the conversion unit 32, and dynamic range information, and inputs video based on the dynamic range information.
- This is a circuit that selects one of the signal and the output video signal and outputs the selected signal to the display unit 2.
- the selection unit 33 selects and displays the output video signal. Output to part 2.
- the selection unit 33 selects the input video signal and displays it on the display unit 2. Output. Note that when both the SDR flag and the HDR flag are not input, the selection unit 33 may operate as if the SDR flag has been input.
- FIG. 8 is a flowchart illustrating an example of a signal processing method executed by the tuner unit 3 according to the first embodiment.
- the receiving unit 31 When receiving a broadcast wave from the antenna, the receiving unit 31 converts the received broadcast wave into an input video signal. Then, the reception unit 31 outputs additional information added to the input video signal to the parameter calculation unit 322. In addition, the reception unit 31 outputs the input video signal to the HDR / SDR conversion unit 321 and the selection unit 33. Further, the receiving unit 31 outputs the dynamic range information added to the input video signal to the selection unit 33 (step S1).
- the parameter calculation unit 322 calculates a parameter based on the additional information input from the reception unit 31, and outputs the calculated parameter to the HDR / SDR conversion unit 321 (step S2).
- the HDR / SDR conversion unit 321 converts the input video signal into an output video signal by performing luminance conversion based on the parameter with respect to the input video signal input from the reception unit 31, and selects the output video signal as a selection unit. (Step S3).
- the selection unit 33 determines whether the HDR flag is input from the reception unit 31 (step S4).
- step S4 determines in step S4 that the HDR flag has been input (Yes in step S4), the selection unit 33 selects the output video signal and outputs it to the display unit 2 (step S5).
- the selection unit 33 determines in step S4 that the HDR flag is not input (No in step S4), the selection unit 33 selects the input video signal and outputs it to the display unit 2 (step S6).
- the tuner unit 3 executes processing based on this flowchart on the input video signal for each frame.
- the parameter used immediately before one frame before
- the tuner unit 3 can reduce the difference between the parameter used immediately before and the currently calculated parameter even when the gain information is switched from 1 to 0.
- the tuner unit 3 can prevent the parameter used as the usage ratio from changing sharply for each frame when the output video signal is created.
- the display apparatus 1 can suppress the occurrence of flickering for each frame in the video displayed on the display unit 2.
- the signal processing device is a signal processing device that outputs a video signal to a display unit.
- the signal processing device includes a conversion unit and a selection unit.
- the conversion unit converts the input video signal into an output video signal for a low-brightness display device having a lower upper limit of the displayable luminance range than the high-brightness display device.
- the selection unit receives the input video signal and the output video signal, selects one of the input video signal and the output video signal, and outputs the selected signal to the display unit.
- the selection unit selects the output video signal when the high luminance flag indicating that the video signal is for the high luminance display device is added to the input video signal, and the high luminance flag is added to the input video signal. If not, the input video signal is selected.
- the display device includes a signal processing device and a display unit.
- the signal processing method is a signal processing method for outputting a video signal to the display unit.
- the signal processing method includes the steps of converting an input video signal into an output video signal for a low-brightness display device having a lower upper limit of the displayable luminance range than the high-brightness display device, and the input video signal and the output video signal
- the output video signal is output to the display unit. Is selected and the high luminance flag is not added to the input video signal, the input video signal is selected.
- the display device 1 is an example of a display device.
- the display unit 2 is an example of a display unit, and is also an example of a low luminance display device.
- the tuner unit 3 is an example of a signal processing device.
- the conversion unit 32 is an example of a conversion unit.
- the selection unit 33 is an example of a selection unit.
- the selection unit 33 selects and displays the output video signal. Output to part 2.
- the output video signal is obtained by converting the luminance of the input video signal so as to correspond to the luminance range that can be displayed on the display unit 2.
- the input video signal exceeding the display capability (dynamic range) of the display unit 2 is converted into an output video signal that matches the display capability (dynamic range) of the display unit 2.
- the selection unit 33 selects this output video signal and outputs it to the display unit 2. Therefore, the display device 1 including the tuner unit 3 is based on the input video signal by suppressing the deterioration of image quality even when an input video signal having a luminance exceeding the upper limit of the luminance that can be displayed on the display unit 2 is input. An image can be displayed on the display unit 2.
- the selection unit 33 selects the input video signal and outputs it to the display unit 2.
- An input video signal without an HDR flag is a video signal conforming to a standard dynamic range. Therefore, even if the display unit 2 is a display unit 2 capable of displaying an image with a standard dynamic range, the display device 1 can display an image based on the input video signal on the display unit 2 with sufficient image quality. it can.
- the conversion unit may convert the input video signal into an output conversion signal using at least one of at least two types of conversion characteristic curves.
- the first conversion characteristic curve C1 and the second conversion characteristic curve C2 are examples of the conversion characteristic curve.
- the conversion unit 32 includes at least two types of conversion characteristic curves (for example, the first conversion characteristic curve C1 and the second conversion characteristic curve C2).
- One is used to convert an input video signal into an output conversion signal. Therefore, the tuner unit 3 can convert an input video signal into an output conversion signal by using a conversion characteristic curve giving priority to luminance or using a conversion characteristic curve giving priority to gradation.
- the conversion unit may convert the input video signal into an output conversion signal using at least two of at least two types of conversion characteristic curves. Further, the conversion unit may determine a usage ratio of at least two types of conversion characteristic curves based on a value related to the luminance of the input video signal.
- the synthesizing unit 39 performs a process of synthesizing the first converted video signal based on the first conversion characteristic curve C1 and the second converted video signal based on the second conversion characteristic curve C2 in accordance with the usage ratio. It is an example of the process part to perform.
- the conversion unit 32 uses at least two types of conversion characteristic curves (for example, the first conversion characteristic curve C1) based on the value related to the luminance of the input video signal. And the usage ratio of the second conversion characteristic curve C2) is determined.
- the tuner unit 3 uses the first conversion video signal based on the first conversion characteristic curve C1 and the second conversion based on the second conversion characteristic curve C2 at a usage ratio suitable for the luminance of the input video signal.
- the video signal can be synthesized by the synthesis unit 39.
- the first conversion characteristic curve is an upper limit value of a signal having a luminance exceeding the upper limit value of the displayable luminance range of the display unit in the input video signal. It may be a conversion characteristic curve that converts the luminance of a signal within the range of luminance that can be displayed on the display unit of the input video signal to be converted based on a predetermined standard.
- the second conversion characteristic curve may be a conversion characteristic curve that reduces the luminance of the input video signal so as to be within the displayable luminance range of the display unit.
- the first conversion characteristic curve C1 is an example of the first conversion characteristic curve.
- the second conversion characteristic curve C2 is an example of a second conversion characteristic curve.
- the input video signal whose maximum luminance is equal to or less than the first threshold T1 is a video signal having the maximum luminance that can be expressed within the dynamic range that can be displayed on the display unit 2. That is, this input video signal does not include a high-luminance portion that cannot be displayed on the display unit 2. If the tuner unit 3 converts the luminance of the input video signal using the first conversion characteristic curve C1, the input video signal does not generate a pseudo contour or white crushing, and the original video signal has an original characteristic. It can be converted into a video signal having brightness close to brightness.
- an input video signal whose maximum luminance is larger than the second threshold value T2 is a video signal having a maximum luminance that cannot be displayed on the display unit 2.
- the tuner unit 3 converts the luminance of the input video signal using the second conversion characteristic curve C2, the input video signal becomes darker than the original brightness of the input video signal.
- the video signal can be converted into a video signal maintaining its characteristics.
- the value relating to the luminance of the input video signal may be included in the additional information added in advance to the input video signal.
- the value related to the luminance of the input video signal is included in the additional information added in advance to the input video signal.
- Information about the luminance of the signal can be obtained directly.
- the value related to the luminance of the input video signal is the maximum luminance within one frame of the input video signal, the average luminance within one frame of the input video signal, and the predetermined number of frames of the input video signal. At least one of an average maximum luminance per frame calculated from the maximum luminance, a luminance histogram within one frame of the input video signal, and a motion vector per unit pixel block included in the input video signal Good.
- the tuner unit 3 sets the maximum luminance within one frame of the input video signal and the average luminance within one frame of the input video signal as values related to the luminance of the input video signal.
- Average maximum luminance per frame calculated from the maximum luminance within the predetermined number of frames of the input video signal, a luminance histogram within one frame of the input video signal, and per unit pixel block included in the input video signal At least one of a motion vector may be used.
- the conversion unit may reflect the usage rate used immediately before the usage rate currently calculated.
- the time constant processing unit 36 is an example of a processing unit that executes a process of reflecting the usage rate used immediately before the usage rate currently calculated.
- the tuner unit 3 reflects the parameter used immediately before the currently calculated parameter, so that a sudden change occurs in the luminance conversion result for each frame. Can be suppressed. Therefore, the display device 1 including the tuner unit 3 can suppress occurrence of flicker for each frame in the video displayed on the display unit 2.
- the conversion unit sets the usage ratio of the first conversion characteristic curve to 100% and the value related to the luminance of the input video signal is equal to the first value. If the second conversion characteristic curve is greater than or equal to the second threshold, the usage rate of the second conversion characteristic curve is 100%, and the value related to the luminance of the input video signal is between the first threshold and the second threshold. In some cases, the usage ratio between the first conversion characteristic curve and the second conversion characteristic curve may be a predetermined ratio.
- the first converted video signal is an example of a video signal converted using the first conversion characteristic curve.
- the second converted video signal is an example of a video signal converted using the second conversion characteristic curve.
- the first threshold T1 is an example of a first threshold.
- the second threshold T2 is an example of a second threshold.
- the linear portion L is an example of a function for determining a predetermined ratio.
- the maximum luminance is an example of a value related to the luminance of the input video signal.
- the conversion unit 32 uses 100% of the second converted video signal as the output video signal based on Equation 1.
- the gain information is “0” and the parameter is “0” in the conversion unit 32.
- the conversion unit 32 uses 100% of the first converted video signal as the output video signal based on Equation 1.
- the gain information has a predetermined ratio based on the relationship of the linear part L, and the parameter also has a predetermined ratio. Become. For this reason, in the conversion unit 32, a signal obtained by combining the first converted video signal and the second converted video signal at a predetermined ratio based on Equation 1 becomes an output video signal.
- the parameter is not only “0” or “1”, but a value between “0” and “1” is also used for the parameter.
- the gain information when the gain information is assigned to either “0” or “1” with one threshold value, the gain information changes sharply when the maximum luminance exceeds or falls below the threshold value.
- two threshold values are used to determine gain information, “0”, “1”, and a value between “0” and “1” are used as gain information.
- the conversion unit when the value related to the luminance of the input video signal is equal to or less than the first threshold, the conversion unit sets the usage ratio of the first conversion characteristic curve to 100% and the value related to the luminance of the input video signal is the first value. When it is larger than the threshold, the usage rate of the second conversion characteristic curve may be set to 100%.
- the conversion unit 32 sets the usage rate of the first converted video signal based on the first conversion characteristic curve C1 to 100% when the maximum luminance is equal to or lower than the first threshold.
- the usage rate of the second converted video signal based on the second conversion characteristic curve C2 may be set to 100%.
- the parameter calculation unit 322 may use the gain information as it is without providing the time constant processing unit 36.
- the converter 32 of the tuner unit 3 combines the first converted video signal and the second converted video signal at a predetermined ratio, thereby converting the input video signal into the output video signal.
- the operation example to be described was explained. However, the present disclosure is not limited to this operation example.
- the conversion unit 32 combines the first conversion characteristic curve C1 and the second conversion characteristic curve C2 at a predetermined ratio, and uses the converted conversion characteristic curve to convert the input video signal into the output video signal. It may be converted. That is, in the tuner unit 3, the conversion characteristic curve is not limited to the two types described above, and three or more types may be used.
- the input video signal is displayed regardless of whether the HDR flag, which is a high luminance flag, is added to the input video signal or the HDR flag is not added to the input video signal.
- the operation example converted into the output video signal by the conversion unit 32 has been described. However, the present disclosure is not limited to this operation example.
- the conversion unit 32 may not convert the input video signal into the output video signal when the HDR flag is not added to the input video signal. That is, the converter 32 may convert the input video signal and create an output video signal when detecting that the HDR flag is added to the input video signal.
- FIG. 9 is a block diagram schematically showing a configuration example of the display device 1A in the second embodiment.
- the display device 1A includes a display unit 2 and a tuner unit 3A.
- the display unit 2 and the tuner unit 3A are connected to each other so as to communicate with each other.
- the display device 1A is, for example, a television.
- FIG. 9 shows only the components related to the present embodiment among the plurality of components included in the display device 1A, and other components are omitted.
- Other components include components that are generally included in a television set, but a description thereof is omitted.
- tuner unit 3A in the second embodiment has substantially the same configuration as tuner unit 3 described in the first embodiment.
- the tuner unit 3A further includes an analysis information detection unit 41 in addition to the configuration. That is, the tuner unit 3A included in the display device 1A according to the present embodiment includes a reception unit 31A, an analysis information detection unit 41, a conversion unit 32A, and a selection unit 33.
- the receiving unit 31A is a circuit that converts a broadcast wave input via an antenna into an input video signal.
- the reception unit 31A outputs additional information added to the input video signal to the parameter calculation unit 322A of the conversion unit 32A. In addition, the reception unit 31A outputs the input video signal to the analysis information detection unit 41, the HDR / SDR conversion unit 321A, and the selection unit 33. In addition, the reception unit 31A outputs the dynamic range information added to the input video signal to the selection unit 33. Furthermore, the receiving unit 31A outputs the motion vector calculated from the input video signal to the converting unit 32A.
- the receiving unit 31A outputs the sum of absolute values of motion vectors (vector quantities) of one frame as a motion vector (scalar quantity). Therefore, the motion vector output from the receiving unit 31A has a relatively small value in an image with relatively slow motion (or an image with relatively little motion), and an image with relatively fast motion (or In the case of a video with relatively much movement), the value becomes relatively large.
- the receiving unit 31A may output, for example, the maximum absolute value of a motion vector (vector amount) of one frame as a motion vector (scalar amount).
- the reception unit 31A may output the sum of one frame of absolute values of motion vectors (vector amounts) whose absolute values are equal to or greater than a predetermined value as motion vectors (scalar amounts).
- FIG. 10 is a block diagram schematically showing a configuration example of the analysis information detection unit 41 in the second embodiment.
- the analysis information detection unit 41 includes an average luminance calculation unit 411, a maximum luminance calculation unit 412, a luminance histogram calculation unit 413, a first gain calculation unit 414, and a second gain calculation unit 415. , A third gain calculation unit 416, and a synthesis unit 417.
- the average luminance calculation unit 411 is a circuit that calculates the average luminance within one frame of the input video signal. Specifically, the average luminance calculation unit 411 calculates an average value of the luminance of all pixels (substantially all pixels) for one frame based on the input video signal, and sets the calculated result as the average luminance.
- the maximum luminance calculation unit 412 is a circuit that calculates the maximum luminance within one frame of the input video signal. Specifically, the average luminance calculation unit 411 calculates the maximum (substantially maximum) luminance value from the luminance of all pixels (substantially all pixels) for one frame based on the input video signal, and the calculation result Is the maximum luminance.
- the luminance histogram calculation unit 413 is a circuit that calculates a luminance histogram within one frame of the input video signal. Specifically, the luminance histogram calculation unit 413 calculates a luminance histogram of all pixels for one frame based on the input video signal.
- FIG. 11 is a diagram for explaining the luminance histogram in the second embodiment.
- the luminance frequency is constant as a whole ((b) in FIG. 11). (See the figure).
- an image based on the input video signal has a dark portion with a constant luminance and a bright portion with a constant luminance within one frame, and the dark portion has a larger area. In the case of a large image, the frequency is higher in the luminance of the dark part (see FIG. 11D).
- the luminance histogram calculation unit 413 uses the luminance frequency in the high luminance part larger than the predetermined threshold as the luminance histogram. To do.
- the predetermined threshold here may be set arbitrarily between 0 and the maximum value of the luminance of the input video signal.
- the first gain calculation unit 414 is a circuit that calculates first gain information based on the average luminance calculated by the average luminance calculation unit 411. Specifically, the gain calculation unit 35 calculates the first gain information from the maximum luminance, using the first threshold, the second threshold larger than the first threshold, and the following graph.
- FIG. 12 is a graph showing an example of the relationship between gain information and maximum brightness in the second embodiment.
- the first gain calculation unit 414 sets the first gain information to “0” when the maximum luminance is not more than the first threshold T3, and the maximum luminance is not less than the second threshold T4. In some cases, the first gain information is set to “1”. Further, the graph shown in FIG. 12 is a linear graph connecting “0” and “1” between the first threshold T3 and the second threshold T4. Therefore, when the maximum luminance is between the first threshold value T3 and the second threshold value T4, the first gain calculation unit 414 uses the value based on the linear portion L1 as the first gain information. This value is a predetermined ratio.
- the second gain calculation unit 415 is a circuit that calculates the second gain information based on the maximum luminance calculated by the maximum luminance calculation unit 412.
- the third gain calculation unit 416 is a circuit that calculates third gain information based on the luminance histogram calculated by the luminance histogram calculation unit 413.
- the second gain calculation unit 415 and the third gain calculation unit 416 also calculate each gain information using a graph similar to the graph shown in FIG.
- the first threshold value T3 and the second threshold value T4 may be set to different values in the first gain calculation unit 414, the second gain calculation unit 415, and the third gain calculation unit 416, respectively.
- the first threshold T3 and the second threshold T4 are set to appropriate values based on various experiments, simulations, and the like.
- the combining unit 417 calculates analysis information by combining the first gain information, the second gain information, and the third gain information at a predetermined ratio, and calculates the analysis information as a parameter.
- This is a circuit for outputting to the unit 322A.
- the synthesis unit 417 calculates analysis information according to the following expression 3.
- Analysis information first gain information ⁇ ⁇ 1 + second gain information ⁇ ⁇ 2 + third gain information ⁇ (1- ⁇ 1- ⁇ 2) (Equation 3)
- ⁇ 1 and ⁇ 2 are weighting coefficients and satisfy the following relationship. 0 ⁇ ⁇ 1 ⁇ 1, 0 ⁇ ⁇ 2 ⁇ 1, ⁇ 1 + ⁇ 2 ⁇ 1.
- ⁇ 1 and ⁇ 2 are set to appropriate values based on various experiments, simulations, and the like.
- the parameter calculation unit 322A is a circuit that calculates parameters for converting the input video signal.
- the parameter calculation unit 322 calculates parameters based on the additional information input from the reception unit 31A, the analysis information input from the analysis information detection unit 41, and the motion vector input from the reception unit 31A.
- FIG. 13 is a block diagram schematically illustrating a configuration example of the parameter calculation unit 322A according to the second embodiment.
- the parameter calculation unit 322A includes a gain calculation unit 35A, a synthesis unit 42, a time constant processing unit 36A, a motion vector gain calculation unit 43, and an integration unit 44.
- the gain calculation unit 35A is a circuit that calculates gain information based on the maximum luminance input as additional information from the reception unit 31A. Specifically, the gain calculation unit 35A calculates gain information from the maximum luminance by using the first threshold T1, the second threshold T2 that is larger than the first threshold, and the graph of FIG. . Since the gain calculation unit 35A is substantially the same as the gain calculation unit 35 shown in the first embodiment, detailed description thereof is omitted.
- the synthesizing unit 42 synthesizes the gain information input from the gain calculating unit 35A and the analysis information input from the analysis information detecting unit 41 at a predetermined ratio to generate synthesized information, and the synthesized information is converted into a time constant. It is a circuit that outputs to the processing unit 36A. Specifically, the synthesis unit 42 creates synthesis information according to the following Equation 4.
- Synthesis information calculated gain information ⁇ ⁇ + analysis information ⁇ (1- ⁇ ) (Formula 4)
- ⁇ is a weighting coefficient and satisfies the following relationship. 0 ⁇ ⁇ ⁇ 1.
- ⁇ is set to an appropriate value based on various experiments and simulations.
- the time constant processing unit 36A calculates the next parameter based on the current synthesis information calculated by the synthesis unit 42 and the parameter calculated immediately before by the time constant processing unit 36A, and the calculated parameter is added to the integration unit. 44 is a circuit to output to 44. Specifically, the time constant processing unit 36A calculates a parameter from the following formula 5, for example.
- Parameter calculated synthesis information ⁇ ⁇ + parameter calculated immediately before by the time constant processing unit 36A ⁇ (1- ⁇ ) (Expression 5)
- ⁇ is a weighting coefficient and satisfies the following relationship. 0 ⁇ ⁇ ⁇ 1.
- ⁇ is set to an appropriate value based on various experiments and simulations.
- the motion vector gain calculation unit 43 is a circuit that calculates motion vector gain information based on the motion vector input from the reception unit 31A and outputs the calculated motion vector gain information to the integration unit 44. Specifically, the motion vector gain calculation unit 43 calculates the motion vector gain information from the motion vector using the first threshold, the second threshold larger than the first threshold, and the following graph. To do.
- FIG. 14 is a graph showing an example of the relationship between the motion vector gain information and the motion vector in the second embodiment.
- the motion vector gain calculation unit 43 sets the motion vector gain information to “1” when the motion vector is equal to or less than the first threshold T5, and the motion vector is equal to or greater than the second threshold T6.
- the motion vector gain information is “Gmin”.
- Gmin is a value that satisfies the following relationship. 0 ⁇ Gmin ⁇ 1.
- the graph shown in FIG. 14 is a linear graph connecting “1” and “Gmin” between the first threshold value T5 and the second threshold value T6. Therefore, when the motion vector is between the first threshold value T5 and the second threshold value T6, the motion vector gain calculation unit 43 sets a value based on the linear portion L2 as motion vector gain information.
- the motion vector gain information output from the motion vector gain calculation unit 43 has a relatively large value in an image with relatively slow motion (or an image with relatively little motion), and the motion is relatively A fast image (or an image with relatively much motion) has a relatively small value.
- the integrating unit 44 integrates the motion vector gain calculated by the motion vector gain calculating unit 43 to the parameter calculated by the time constant processing unit 36A, and sets the parameter calculated by the integration to the HDR.
- This is a circuit that outputs to the / SDR converter 321A.
- the parameter output from the integration unit 44 has a relatively large value for an image with relatively slow motion (or an image with relatively little motion) and an image with fast motion (or motion). In the case of a video having a relatively large number, the value is relatively small.
- the HDR / SDR conversion unit 321A is a circuit that generates an output video signal by performing a luminance conversion process on the input video signal using the parameter calculated by the parameter calculation unit 322A. .
- the HDR / SDR conversion unit 321A is substantially the same as the HDR / SDR conversion unit 321 shown in FIG. 2 in the first embodiment, detailed description thereof is omitted.
- the HDR / SDR conversion unit 321A as in the HDR / SDR conversion unit 321, when the parameter value is relatively small, the ratio of the first converted video signal is relatively large and the parameter value is relatively large. Sometimes the ratio of the second converted video signal is relatively high.
- the video signal output from the HDR / SDR converter 321A has a relatively high ratio of the second converted video signal in a video with relatively slow motion (or video with relatively little motion), In a video with a relatively fast movement (or a video with a relatively large amount of motion), the ratio of the first converted video signal is relatively high.
- the selector 33 receives the input video signal and the output video signal obtained by converting the input video signal by the converter 32A, selects one of the input video signal and the output video signal, and selects the selected signal. It is a circuit that outputs to the display unit 2. Specifically, when there is an HDR flag, that is, when the input video signal is a video signal for a high-luminance display device, the selection unit 33 selects the output video signal and outputs it to the display unit 2. In addition, when there is an SDR flag, that is, when there is no HDR flag, the selection unit 33 selects an input video signal and outputs it to the display unit 2.
- FIG. 15 is a flowchart illustrating an example of a signal processing method executed by the tuner unit 3A according to the second embodiment.
- the receiving unit 31A When receiving the broadcast wave from the antenna, the receiving unit 31A converts the received broadcast wave into an input video signal. Then, the reception unit 31A outputs additional information added to the input video signal and a motion vector calculated from the input video signal to the parameter calculation unit 322A. In addition, the reception unit 31A outputs the input video signal to the HDR / SDR conversion unit 321A, the selection unit 33, and the analysis information detection unit 41. In addition, the receiving unit 31A outputs the dynamic range information added to the input video signal to the selection unit 33 (step S11).
- the analysis information detection unit 41 calculates the average luminance, the maximum luminance, and the luminance histogram per frame of the input video signal, and detects the analysis information based on these. To do. Then, the analysis information detection unit 41 outputs the analysis information to the parameter calculation unit 322A (step S12).
- the parameter calculation unit 322A calculates a parameter based on the additional information input from the reception unit 31A, the analysis information input from the analysis information detection unit 41, and the motion vector input from the reception unit 31A.
- the processed parameters are output to the HDR / SDR converter 321A (step S13).
- the HDR / SDR conversion unit 321A converts the input video signal into an output video signal by performing luminance conversion based on the parameter with respect to the input video signal input from the reception unit 31A, and selects the output video signal. (Step S14).
- the selection unit 33 determines whether or not the HDR flag is input from the reception unit 31A (step S15).
- the selection unit 33 determines in step S15 that the HDR flag is not input (No in step S15)
- the selection unit 33 selects the input video signal and outputs it to the display unit 2 (step S16).
- the selection unit 33 determines in step S15 that the HDR flag has been input (Yes in step S15)
- the selection unit 33 selects the output video signal and outputs it to the display unit 2 (step S17).
- the tuner unit 3A executes processing based on this flowchart on the input video signal for each frame.
- the signal processing apparatus further includes an analysis information detection unit that analyzes input video signals and detects analysis information.
- the value relating to the luminance of the input video signal is included in the analysis information detected by analyzing the input video signal in the analysis information detection unit.
- the display device 1A is an example of a display device.
- the tuner unit 3A is an example of a signal processing device.
- the conversion unit 32A is an example of a conversion unit.
- the parameter calculated by the parameter calculation unit 322A is an example of a usage ratio.
- the time constant processing unit 36A is an example of a processing unit that executes a process of reflecting the usage rate used immediately before the usage rate currently calculated.
- the analysis information detection unit 41 is an example of an analysis information detection unit.
- the tuner unit 3A further includes an analysis information detection unit 41 that analyzes input video signals and detects analysis information.
- the value relating to the luminance of the input video signal is included in the analysis information detected by analyzing the input video signal in the analysis information detection unit.
- the tuner unit 3A can calculate the value related to the luminance even if the value related to the luminance is not added to the input video signal.
- the tuner unit 3A calculates parameters using a combination of analysis information and additional information, and therefore can calculate parameters more appropriate for the input video signal.
- Embodiments 1 and 2 have been described as examples of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can also be applied to embodiments in which changes, replacements, additions, omissions, and the like are performed. Moreover, it is also possible to combine each component demonstrated in the said Embodiment 1, 2 and it can also be set as a new embodiment.
- the tuner unit 3 (3A) mounted on the display device 1 (1A) is a signal processing device
- the signal processing device may be separate from the display device 1 (1A).
- a signal processing device separate from the display device 1 (1A) for example, a tuner device, an optical disk reproducing device, a game machine, a personal computer, a smartphone, a mobile phone, a tablet device, and the like can be applied.
- information indicating the dynamic range that can be displayed on the display device can be output from the display device to the signal processing device by allowing the signal processing device and the display device to communicate with each other by wire or wirelessly. .
- a distribution using a recording medium in addition to the broadcast wave distribution as described above, a distribution using a recording medium, a distribution using the Internet, and the like can be given.
- the recording medium include optical media such as BLU-RAY (registered trademark) DISC, flash memory such as an SD card, and the like.
- each component may be configured by dedicated hardware, or may be realized by executing a software program suitable for each component by a processor.
- Each component may be realized by a program execution unit such as a CPU (Central Processing Unit) or a processor reading and executing a software program recorded on a recording medium such as a hard disk or a semiconductor memory.
- a program execution unit such as a CPU (Central Processing Unit) or a processor reading and executing a software program recorded on a recording medium such as a hard disk or a semiconductor memory.
- the present disclosure may be the above-described program, or a non-transitory computer-readable recording medium on which the above-described program is recorded.
- the present disclosure is applicable to a signal processing device, a display device, a signal processing method, and a program that process a video signal in accordance with a standard that handles HDR. Specifically, the present disclosure is applicable to a video receiving device such as a television.
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Abstract
Description
以下、図1~図8を用いて、実施の形態1を説明する。
[1-1-1.表示装置]
図1は、実施の形態1における表示装置1の一構成例を模式的に示すブロック図である。
チューナー部3は、アンテナを介して入力された放送波を映像信号に変換して、その映像信号を表示部2に出力する信号処理装置である。
図1に示すように、パラメータ算出部322は、入力映像信号を変換するためのパラメータを算出する回路である。パラメータ算出部322は、受信部31から入力された付加情報に基づいてパラメータを算出する。ここで、パラメータとは、合成部39で用いられる第1の変換特性カーブC1と第2の変換特性カーブC2との使用割合のことである。具体的には、パラメータは、第1の変換特性カーブC1に基づく第1の変換映像信号と、第2の変換特性カーブC2に基づく第2の変換映像信号とを合成する際の、両者の割合である。
αは重み付け係数であり、次の関係を満たす値である。0≦α≦1。αは、種々の実験、シミュレーションに基づき適切な値に設定されている。
以上のように構成されたチューナー部3について、その動作を以下に説明する。
以上のように、本実施の形態において、信号処理装置は、映像信号を表示部に出力する信号処理装置である。信号処理装置は、変換部と、選択部と、を備える。変換部は、入力映像信号を、高輝度表示装置よりも表示可能な輝度の範囲の上限値が小さい低輝度表示装置向けの出力映像信号に変換する。選択部は、入力映像信号と出力映像信号とが入力され、入力映像信号と出力映像信号との一方を選択して表示部に出力する。選択部は、高輝度表示装置向けの映像信号である旨を示す高輝度フラグが入力映像信号に付加されている場合には出力映像信号を選択し、高輝度フラグが入力映像信号に付加されていない場合には入力映像信号を選択する。
以下、図9~図15を用いて、実施の形態2を説明する。
図9は、実施の形態2における表示装置1Aの一構成例を模式的に示すブロック図である。
図9に示すように、実施の形態2におけるチューナー部3Aは、実施の形態1で説明したチューナー部3と実質的に同じ構成を備える。チューナー部3Aは、その構成に加えて、さらに、分析情報検出部41を備える。すなわち、本実施の形態の表示装置1Aに備わるチューナー部3Aは、受信部31Aと、分析情報検出部41と、変換部32Aと、選択部33と、を備える。
β1およびβ2は、重み付け係数であり、次の関係を満たす値である。0≦β1≦1、0≦β2≦1、β1+β2≦1。β1およびβ2は、種々の実験、シミュレーション等に基づき適切な値に設定されている。
δは重み付け係数であり、次の関係を満たす値である。0≦δ≦1。δは、種々の実験、シミュレーション等に基づき適切な値に設定されている。
γは重み付け係数であり、次の関係を満たす値である。0≦γ≦1。γは、種々の実験、シミュレーション等に基づき適切な値に設定されている。
以上のように構成されたチューナー部3Aについて、その動作を以下に説明する。
以上のように、本実施の形態において、信号処理装置は、入力映像信号を分析して分析情報を検出する分析情報検出部をさらに備える。そして、入力映像信号の輝度に関する値は、分析情報検出部において入力映像信号を分析して検出した分析情報に含まれる。
以上のように、本出願において開示する技術の例示として、実施の形態1、2を説明した。しかしながら、本開示における技術は、これに限定されず、変更、置き換え、付加、省略等を行った実施の形態にも適用できる。また、上記実施の形態1、2で説明した各構成要素を組み合わせて、新たな実施の形態とすることも可能である。
2 表示部
3,3A チューナー部
31,31A 受信部
32,32A 変換部
33 選択部
35,35A ゲイン算出部
36,36A 時定数処理部
37 第1階調変換部
38 第2階調変換部
39,42,417 合成部
41 分析情報検出部
43 動きベクトルゲイン算出部
321,321A HDR/SDR変換部
322,322A パラメータ算出部
411 平均輝度算出部
412 最大輝度算出部
413 輝度ヒストグラム算出部
414 第1ゲイン算出部
415 第2ゲイン算出部
416 第3ゲイン算出部
Claims (13)
- 映像信号を表示部に出力する信号処理装置であって、
入力映像信号を、高輝度表示装置よりも表示可能な輝度の範囲の上限値が小さい低輝度表示装置向けの出力映像信号に変換する変換部と、
前記入力映像信号と前記出力映像信号とが入力され、前記入力映像信号と前記出力映像信号との一方を選択して前記表示部に出力する選択部と、を備え、
前記選択部は、前記高輝度表示装置向けの映像信号である旨を示す高輝度フラグが前記入力映像信号に付加されている場合には前記出力映像信号を選択し、前記高輝度フラグが前記入力映像信号に付加されていない場合には前記入力映像信号を選択する、
信号処理装置。 - 前記変換部は、少なくとも2種類の変換特性カーブの少なくとも1つを用いて、前記入力映像信号を前記出力変換信号に変換する、
請求項1に記載の信号処理装置。 - 前記変換部は、前記少なくとも2種類の変換特性カーブのうちの少なくとも2つを用いて前記入力映像信号を前記出力変換信号に変換し、前記入力映像信号の輝度に関する値に基づいて、前記少なくとも2種類の変換特性カーブの使用割合を決定する、
請求項2に記載の信号処理装置。 - 前記少なくとも2種類の変換特性カーブのうち、第1の変換特性カーブは、前記入力映像信号のうち、前記表示部の表示可能な輝度の範囲の上限値を超える輝度となる信号を前記上限値近傍の輝度に変換させ、かつ前記入力映像信号のうち前記表示部の表示可能な輝度の範囲に収まる信号の輝度を所定の規格に基づくように変換させる変換特性カーブであり、
前記少なくとも2種類の変換特性カーブのうち、第2の変換特性カーブは、前記表示部の表示可能な輝度の範囲に収まるように前記入力映像信号の輝度を縮小させる変換特性カーブである、
請求項3に記載の信号処理装置。 - 前記変換部は、前記入力映像信号の輝度に関する値が第1の閾値以下の場合、前記第1の変換特性カーブの前記使用割合を100%とし、前記入力映像信号の輝度に関する値が第1の閾値よりも大きい場合、前記第2の変換特性カーブの前記使用割合を100%とする、
請求項4に記載の信号処理装置。 - 前記変換部は、
前記入力映像信号の輝度に関する値が第1の閾値以下の場合、前記第1の変換特性カーブの前記使用割合を100%とし、
前記入力映像信号の輝度に関する値が、第1の閾値よりも大きい第2の閾値以上である場合、前記第2の変換特性カーブの前記使用割合を100%とし、
前記入力映像信号の輝度に関する値が、前記第1の閾値と前記第2の閾値との間にある場合、前記第1の変換特性カーブと前記第2の変換特性カーブとの前記使用割合を所定の比率とする、
請求項4に記載の信号処理装置。 - 前記変換部は、現在算出する前記使用割合に対して、直前に用いた前記使用割合を反映させる、
請求項3に記載の信号処理装置。 - 前記入力映像信号の輝度に関する値は、前記入力映像信号にあらかじめ付加された付加情報に含まれる、
請求項3に記載の信号処理装置。 - 前記入力映像信号を分析して分析情報を検出する分析情報検出部をさらに備え、
前記入力映像信号の輝度に関する値は、前記分析情報検出部において前記入力映像信号を分析して検出した前記分析情報に含まれる、
請求項3に記載の信号処理装置。 - 前記入力映像信号の輝度に関する値は、前記入力映像信号の1フレーム内での最大輝度と、前記入力映像信号の1フレーム内での平均輝度と、前記入力映像信号の所定フレーム数内での最大輝度から算出した1フレームあたりの平均最大輝度と、前記入力映像信号の1フレーム内での輝度ヒストグラムと、前記入力映像信号に含まれる単位画素ブロックあたりの動きベクトルと、の少なくとも1つである、
請求項3に記載の信号処理装置。 - 請求項1に記載の信号処理装置と、
表示部と、を備える、
表示装置。 - 映像信号を表示部に出力する信号処理方法であって、
入力映像信号が、高輝度表示装置よりも表示可能な輝度の範囲の上限値が小さい低輝度表示装置向けの出力映像信号に変換されるステップと、
前記入力映像信号と前記出力映像信号との一方が選択されて前記表示部に出力されるステップと、を含み、
前記高輝度表示装置向けの映像信号である旨を示す高輝度フラグが前記入力映像信号に付加されている場合には前記出力映像信号が選択され、前記高輝度フラグが前記入力映像信号に付加されていない場合には前記入力映像信号が選択される、
信号処理方法。 - 映像信号を表示部に出力するためのプログラムであって、
入力映像信号を、高輝度表示装置よりも表示可能な輝度の範囲の上限値が小さい低輝度表示装置向けの出力映像信号に変換し、
前記高輝度表示装置向けの映像信号である旨を示す高輝度フラグが前記入力映像信号に付加されている場合には前記出力映像信号を選択して前記表示部に出力し、前記高輝度フラグが前記入力映像信号に付加されていない場合には前記入力映像信号を選択して前記表示部に出力する、
ことをコンピュータに実行させるプログラム。
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JP2019213119A (ja) * | 2018-06-07 | 2019-12-12 | 日本電気株式会社 | 映像スイッチャおよび切替方法 |
JP7110740B2 (ja) | 2018-06-07 | 2022-08-02 | 日本電気株式会社 | 映像スイッチャおよび切替方法 |
JP7498586B2 (ja) | 2020-04-01 | 2024-06-12 | シャープ株式会社 | 映像処理装置、テレビ受信機、及びプログラム |
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JPWO2016157839A1 (ja) | 2018-03-01 |
CN107409191B (zh) | 2020-03-27 |
EP3276948A4 (en) | 2018-04-25 |
JP6757890B2 (ja) | 2020-09-23 |
CN107409191A (zh) | 2017-11-28 |
EP3276949A1 (en) | 2018-01-31 |
US10057104B2 (en) | 2018-08-21 |
US20180041801A1 (en) | 2018-02-08 |
JPWO2016157838A1 (ja) | 2018-01-18 |
EP3276949A4 (en) | 2018-04-25 |
CN107409190A (zh) | 2017-11-28 |
EP3276948A1 (en) | 2018-01-31 |
CN107409190B (zh) | 2020-04-03 |
US10097886B2 (en) | 2018-10-09 |
WO2016157839A1 (ja) | 2016-10-06 |
US20180041373A1 (en) | 2018-02-08 |
JP6767629B2 (ja) | 2020-10-14 |
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