JP2019114890A - Display apparatus and control method of the same - Google Patents

Abstract

A display device for displaying a waveform monitor in a display format corresponding to an input signal and a control method for the display device are provided. An input unit (101) for inputting a signal including an image signal, a decoder unit (102) for extracting an image signal and additional information from the input signal, an image processing unit (103) for generating an output signal from the image signal, and an image signal. A range calculation unit 104 that calculates range information indicating the effective range of the image signal, a waveform generation unit 105 that generates a waveform screen that clearly shows the correspondence relationship between the effective range of the image signal and the signal level and the luminance, and the output signal and the waveform screen and a display unit 106 that displays . [Selection drawing] Fig. 1

Description

  The present invention relates to a display device capable of displaying a waveform monitor and a control method thereof.

  In video production, video signals of various standards are used. As a standard of broadcasting, ITU (International Telecommunication Union) -R (Radiocommunications Sector) BT. There are 709. Also, as a digital cinema standard, there is DCI (Digital Cinema Initiatives).

  Conventionally, in all of these standards used in video production, the signal range is fixed (0 to 100%). Therefore, the scale of the signal level (0 to 100%) is always displayed on the waveform monitor regardless of the input signal.

  On the other hand, proposals have also been made to dynamically change the display mode of the waveform monitor. Specifically, there has been a method of displaying a waveform monitor by partially enlarging according to the image quality setting (see Patent Document 1).

JP, 2014-107799, A

  In recent years, a new standard corresponding to HDR (High Dynamic Range) has come out. As a representative example, there is SMPTE ST 2084 (hereinafter, ST 2084) proposed by SMPTE (Society of Motion Picture and Television Engineers). Furthermore, HDMI (registered trademark) (High-Definition Multimedia Interface) 2.0a is standardized as a communication interface for transmitting an HDR signal such as ST2084.

  When transmitting the video signal of ST2084 standard by HDMI 2.0a, the transmission side designates the maximum / minimum luminance of the video, and the reproduction side displays the video according to the designated maximum / minimum luminance. In ST2084, the maximum luminance can be specified up to 10000 nit. Also, in HDMI 2.0a, InfoFrame can be used to transmit maximum / minimum luminance of video.

  When the input signal is a 12-bit signal (0 to 4095) of ST2084 standard and the maximum luminance is 2000 nit, the luminance of the 4095 signal is 10000 nit and the luminance of the 3389 signal is about 2000 nit. In this case, the upper limit of the waveform displayed on the waveform monitor is 3389/4095 ≒ 83%.

  As described above, when the input signal is the ST2084 standard, the upper limit of the waveform displayed on the waveform monitor changes with the maximum luminance. Therefore, it is desirable to be able to read the relationship between luminance and waveform from the waveform monitor.

  However, in the above-described prior art, since the display form of the waveform monitor is not changed according to the input signal, the relationship between the luminance and the waveform can not be read from the waveform monitor when the input signal is ST2048 standard.

  Then, an object of this invention is to provide the control method of a display apparatus and a display apparatus which displays a waveform monitor by the display form according to an input signal.

In order to achieve the above object, a display device according to the present invention is:
Signal input means for inputting a signal including additional information of an image signal and an image signal, decoding means for extracting an image signal and additional information from the signal inputted by the signal input means, and image processing means for generating an output signal from the image signal And range calculation means for calculating range information indicating the effective range of the image signal from the additional information, and the waveform clearly indicating the correspondence between the effective range of the image signal and the signal level and the luminance based on the image signal and the range information. It is characterized by having a waveform generation means for generating a screen, and a display means for displaying an output signal and a waveform screen.

  According to the display device according to the present invention, since the display form of the waveform monitor is changed according to the input signal, even when the signal range changes according to the maximum luminance as in ST 2084, the relationship between the luminance and the waveform. Can be accurately grasped.

It is a block diagram which shows schematic structure of the display apparatus which concerns on Example 1 of this invention. It is a flowchart for demonstrating the range calculation process in the range calculation part of the display apparatus which concerns on Example 1 of this invention. It is an example of the imaging | video input into the display apparatus which concerns on Example 1 of this invention. It is an example of a display of the waveform screen displayed with the display apparatus which concerns on Example 1 of this invention. It is a block diagram which shows schematic structure of the imaging device which concerns on Example 2 of this invention, and a display apparatus. It is a flowchart for demonstrating the range calculation process in the range calculation part of the display apparatus which concerns on Example 2 of this invention. It is an example of a display of the waveform screen displayed with the display apparatus which concerns on Example 2 of this invention. It is an example of a display of the waveform screen displayed with the display apparatus which concerns on Example 3 of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the following examples.

  The configuration of the display 100 will be described with reference to FIG.

  The input unit 101 inputs a signal including an image from the outside.

  The decoder unit 102 decodes the signal input by the input unit 101 and extracts a video signal and metadata. The video signal is sent to an image processing unit 103 and a waveform generation unit 105 described later, and the metadata is sent to a range calculation unit 104 described later.

  In the case of HDMI 2.0a, the decoder unit 102 includes a Transition Minimized Differential Signaling (TMDS) decoder. The TMDS decoder separates input signals into video signals, audio, and auxiliary data packets. The packet is assigned a packet type, and a packet of packet type 0x87 indicates an InfoFrame for dynamic range. The decoder unit 102 extracts this InfoFrame as metadata.

  The image processing unit 103 corrects the video signal input from the decoder unit 102 based on the image quality adjustment value specified by the user or the image quality adjustment value included in the metadata extracted by the decoder unit 102.

  The range calculation unit 104 calculates the maximum luminance and the effective range of the video signal from the metadata extracted by the decoder unit 102. When the metadata is not extracted by the decoder unit 102, the maximum luminance of the video signal is the luminance value designated by the user, and the effective range of the video signal is 0 to 100%. The details of the range calculation process in the range calculation unit 104 will be described later with reference to the flowchart of FIG.

  The waveform generation unit 105 extracts the luminance signal from the video signal input from the decoder unit 102, and extracts the waveform of the luminance signal. Furthermore, the waveform screen is generated by clearly indicating the maximum luminance and the effective range of the video signal in the waveform of the luminance signal. The maximum luminance and the effective range of the video signal are acquired from the range calculation unit 104. Details of the waveform screen generated by the waveform generation unit 105 will be described later with reference to FIGS. 3 and 4.

  The display unit 106 superimposes and displays the waveform screen input from the waveform generation unit 105 on the video signal input from the image processing unit 103.

  Details of the range calculation process in the range calculation unit 104 will be described with reference to the flowchart in FIG. In addition, in FIG. 2, the case where a signal is input by HDMI2.0a by S11-S15 is demonstrated.

  First, when the InfoFrame is extracted by the decoder unit 102 (S11), the range calculation unit 104 acquires the InfoFrame extracted from the decoder unit 102 (S12). Further, from the acquired InfoFrame, an EOTF (Electro-Optical Transfer Function) of the video signal is acquired (S13). In EOTF, gradation conversion of a video signal in the display 100 is defined.

  After acquiring the EOTF, the range calculation unit 104 determines the maximum luminance of the video signal based on the EOTF (S14). Specifically, when the EOTF is SDR (Standard Dynamic Range), the maximum luminance of the video signal is set to 100 nit. When the EOTF is HDR, the maximum luminance of the video signal is the maximum luminance of the display 100. When the EOTF is ST2084, the maximum luminance is acquired from the InfoFrame, and is set as the maximum luminance of the video signal.

  Further, the range calculation unit 104 determines the effective range of the video signal based on the EOTF (S15). In the case of the video signal of ST2084 standard, the effective range of the signal differs depending on the maximum luminance. In the case of a 12 bit signal (0 to 4095) of ST2084 standard and the maximum luminance is 2000 nit, 4095 is 10000 nit and 3389 is about 2000 nit. Accordingly, when the maximum luminance is 2000 nit, the upper limit value of the signal level is 3389/4095 ≒ 83%, so the effective range of the signal is 0 to 83%. In the case of a video signal other than the ST2084 standard, the effective range of the signal is always 0 to 100%.

  When InfoFrame is not extracted by the decoder unit 102 (S11), the maximum luminance of the video signal is set to the luminance value designated by the user (S16). Further, the effective range of the video signal is set to 0 to 100% (S17).

  FIG. 4A is a display example of the waveform screen generated by the waveform generation unit 105 when the video signal of ST2084 standard shown in FIG. 3 is input to the display 100. In the example of FIG. 4A, the maximum luminance of the video signal is 2000 nit, and a marker is displayed at a signal level (83%) corresponding to 2000 nit, that is, the upper limit of the signal level. Furthermore, in the vicinity of the marker, the maximum luminance (2000 nit) and the upper limit (83%) of the signal level are clearly indicated.

  FIG. 4B is a display example of a waveform screen generated by the waveform generation unit 105 when a video signal other than the ST2084 standard shown in FIG. 3 is input to the display 100. In the example of FIG. 4B, for the input video signal, the effective range of the video signal is not determined by the maximum luminance. That is, the effective range of the video signal is always 0 to 100%. In this case, the maximum brightness (white brightness) is determined by the user setting, and is 100 nit in the example of FIG. 4 (B).

  As described above, in the first embodiment, the scale display of the waveform monitor is changed according to the input signal. Thereby, when displaying the waveform of the video signal of ST2084 specification, the relationship between the luminance and the waveform can be accurately grasped.

  If the signal range changes dynamically, it is not limited to the ST 2084 standard. Also, the factor that changes the signal range is not limited to the maximum luminance. Further, on the waveform monitor, a scale of luminance and a scale of signal level may be displayed together, or any one of them may be displayed.

  In the second embodiment, the case of changing the scale display of the waveform monitor according to the setting of the camera will be described. In the second embodiment, as shown in FIG. 5, the camera 200 and the display 100 are connected. A video signal is output from the camera 200 to the display 100.

  The configuration of the camera 200 will be described with reference to FIG.

  The storage unit 201 stores setting values of the camera 200 such as ISO (International Organization for Standerdization) sensitivity and OETF (Optical-Electro Transfer Function). The ISO sensitivity represents the sensitivity of the imaging sensor. In OETF, gradation conversion of a video signal in the camera 200 is defined.

  In the imaging unit 202, the imaging sensor converts light into an electrical signal. Furthermore, the imaging unit 202 amplifies or corrects the imaged signal based on the set values such as the ISO sensitivity and the OETF stored in the storage unit 201, and outputs the amplified signal to the output 203.

  The output unit 203 outputs the signal input from the imaging unit 202 to the display 100. Further, the output unit 203 outputs signal information to the display 100 using, for example, an ancillary area of a serial digital interface (SDI) signal. The content of the signal information is determined according to the setting of the OETF stored in the storage unit 201.

  When the OETF is Log, the signal information includes the OETF and the dynamic range (up to 3200%). Here, the dynamic range is up to 3200%, but it differs depending on the OETF. The dynamic range is determined according to the setting of the ISO sensitivity of the camera 200. When the ISO sensitivity is 100, the dynamic range is 100%, and when the ISO sensitivity is 800, the dynamic range is 1600%. However, the relationship between ISO sensitivity and dynamic range is not limited to these. For example, when the ISO sensitivity is 100, the dynamic range may be 200%. In addition to the ISO sensitivity, the dynamic range may be determined in consideration of other factors such as the performance of the lens and the imaging sensor. For example, when the lens is bright or the sensitivity of the imaging sensor is high, a higher dynamic range may be set.

  When the OETF is ST2084, the signal information includes the OETF and the maximum luminance of the signal (up to 10000 nit). The maximum brightness is determined according to the brightness setting of the camera 200. When the luminance setting is 2000 nit, the maximum luminance is also 2000 nit.

  When the OETF has two characteristics (hereinafter referred to as a hybrid), the signal information includes the OETF and the boundary values of the two OETFs. In the hybrid OETF, different OETFs are assigned to the dark side and the bright side. When the OETF is a hybrid, the signal level of the boundary value between the two OETFs is 60%.

  The configuration of the display 100 will be described with reference to FIG. The difference from FIG. 1 will be described below.

  The decoder unit 102 decodes the signal input by the input unit 101 to extract a video signal and signal information. The extracted signal information is sent to the range calculation unit 104 described later.

  The range calculation unit 104 calculates the effective range of the video signal based on the signal information extracted by the decoder unit 102. Further, the range calculation unit 104 sends the signal information of the video signal and the effective range to the waveform generation unit 105. Details of the range calculation process in the range calculation unit 104 will be described later with reference to the flowchart of FIG.

  The waveform generation unit 105 extracts the luminance signal from the video signal input from the decoder unit 102, and extracts the waveform of the luminance signal. Further, the waveform generation unit 105 generates a waveform screen based on the waveform of the luminance signal and the signal information and effective range of the video signal acquired from the range calculation unit 104. Details of the waveform screen generated by the waveform generation unit 105 will be described later with reference to FIG.

  Details of the range calculation process in the range calculation unit 104 will be described with reference to the flowchart in FIG.

  First, the range calculation unit 104 acquires signal information of the video signal from the decoder unit 102. Further, the range calculation unit 104 acquires the OETF included in the signal information (S21).

  When the OETF is Log (S22), the range calculation unit 104 acquires the dynamic range of the video signal from the decoder unit 102 (S23), and determines the effective range of the video signal according to the dynamic range (S24). Here, when the OETF is Log, the dynamic range is up to 3200%. If the dynamic range is 3200%, the effective range of the signal is 0 to 100%, and if the dynamic range is 1600%, the effective range of the signal is 0 to 70%. The relationship between the dynamic range and the effective range of the signal is not limited to these. Also, instead of uniquely determining the effective range of the signal according to the dynamic range, the effective range of the signal is calculated taking into consideration the characteristics of the camera 200 (such as the performance of the lens and the imaging sensor) and other setting values. It is also good.

  When the OETF is ST2084 (S25), the range calculation unit 104 acquires the maximum luminance of the video signal from the decoder unit 102 (S26), and determines the effective range of the video signal according to the maximum luminance (S27). In the case of a 12 bit signal (0 to 4095) of ST2084 standard and the maximum luminance is 2000 nit, 4095 is 10000 nit and 3389 is about 2000 nit. Accordingly, when the maximum luminance is 2000 nit, the upper limit value of the signal level is 3389/4095 ≒ 83%, so the effective range of the signal is 0 to 83%.

  If the OETF is a hybrid (S28), the boundary value of the two OETFs is acquired from the decoder unit 102 (S29), and the effective range of the signal having the dark side OETF is determined according to the boundary value (S30). When the OETF is a hybrid, the signal level of the boundary value is 60%. Therefore, the effective range of the signal having the OETF on the dark side is 0 to 60%.

  If the OETF is neither Log, ST2084, nor hybrid, the effective range of the signal is set to 0 to 100% (S31).

  As described above, the effective range of the signal is set according to the OETF, but the present invention is also applicable to OETFs other than Log, ST2084, and hybrid.

  FIG. 7A is a display example of the waveform screen generated by the waveform generation unit 105 when the video signal with OETF of Log (FIG. 3) is input to the display 100. In the example of FIG. 7A, since the dynamic range of the video signal is 1600% and the effective range of the signal is 0 to 70%, a marker is displayed at the upper limit (70%) of the signal level. Furthermore, in the vicinity of the marker, the dynamic range (1600%) and the upper limit (70%) of the signal level are clearly indicated.

  FIG. 7B is a display example of the waveform screen generated by the waveform generation unit 105 when the video signal (FIG. 3) in which the OETF is ST2084 is input to the display 100. In the example of FIG. 7B, the maximum luminance of the video signal is 2000 nit, and a marker is displayed at a signal level (83%) corresponding to 2000 nit, that is, the upper limit of the signal level. Furthermore, in the vicinity of the marker, the maximum luminance (2000 nit) and the upper limit (83%) of the signal level are clearly indicated.

  FIG. 7C is a display example of the waveform screen generated by the waveform generation unit 105 when the video signal of the OETF hybrid (FIG. 3) is input to the display 100. In FIG. 7C, the waveform of the video signal having the OETF on the dark portion side is displayed in the region 1 and the waveform of the video signal having the OETF on the bright portion side is displayed in the region 2. As shown in FIG. 7C, when the OETF is a hybrid, a marker is displayed on the signal level (60%) of the boundary value of the two OETFs. Although not shown, the differences in the OETF can be easily recognized by color-coding the waveforms in the area 1 and the area 2. If the waveforms of the area 1 and the area 2 can be distinguished, the invention is not limited to the color coding.

  As described above, in the second embodiment, the scale display of the waveform monitor is changed in conjunction with the setting of the camera. As a result, when HDR shooting is performed, it is possible to shoot while adjusting the settings of the camera so as to obtain the intended dynamic range and luminance.

  Although the scale display of the waveform monitor is changed in accordance with the setting of the camera, it may be other than the camera as long as a video signal can be output to the display.

  In the third embodiment, when the effective range of the video signal is not 0 to 100%, the case where the waveform is scaled and displayed will be described.

  The configuration of the display 100 is the same as that shown in FIG.

  The waveform generation unit 105 generates a waveform of the luminance signal based on the video signal input from the decoder unit 102, the maximum luminance of the video signal input from the range calculation unit 104, and the effective range. Here, when the maximum luminance of the video signal is 2000 nit and the effective range is 0 to 83%, as shown in FIG. 8A, no waveform is displayed in the 84 to 100% area, and the display area is wasted. Become. When the maximum luminance of the video signal is lower, the area where the waveform is not displayed, that is, the margin is larger.

  The waveform generation unit 105 scales and adjusts the waveform of the luminance signal so that the maximum value of the effective range is at the upper end of the waveform screen and the minimum value of the effective range is at the lower end of the waveform screen so that such a margin does not occur. . Further, the maximum luminance of the video signal and the maximum value of the effective range are displayed on the upper end of the waveform screen. Specifically, when the maximum luminance of the video signal is 2000 nit and the effective range is 0 to 83%, the signal level of the upper end of the waveform screen is 83% as shown in FIG. 8B. Display the waveform. At the top of the waveform screen, the maximum luminance (2000 nit) and the maximum value (83%) of the effective range are displayed.

  As described above, in the third embodiment, when the effective range of the video signal is not 0 to 100%, the waveform is scaled and displayed. Thereby, when displaying the waveform of the signal of ST2084 specification, the waste of the display area of a waveform monitor can be eliminated.

  When the waveform is scaled and displayed, the waveform may be scaled according to the characteristics of the video signal. Specifically, in the case of the ST2084 standard signal, the higher the luminance, the smaller the gradation allocation, and the higher the luminance, the waveform is compressed and displayed. Therefore, the waveform is scaled so that the gradation allocation becomes even. It is also good.

100 display, 101 input section, 102 decoder section,
103 image processing unit, 104 range calculation unit, 105 waveform generation unit,
106 Display

Claims (5)

Signal input means for inputting a signal including additional information of an image signal and the image signal;
A decoding unit that extracts an image signal and additional information from a signal input by the signal input unit;
Image processing means for generating an output signal from the image signal;
Range calculation means for calculating range information indicating an effective range of the image signal from the additional information;
Waveform generation means for generating a waveform screen clearly showing the correspondence between the effective range of the image signal and the signal level and the luminance based on the image signal and the range information;
Display means for displaying an output signal and a waveform screen;
A display device characterized by having. Signal input means for inputting a signal including additional information of an image signal and the image signal;
A decoding unit that extracts an image signal and additional information from a signal input by the signal input unit;
Image processing means for generating an output signal from the image signal;
Range calculation means for calculating range information indicating an effective range of the image signal from the additional information;
Waveform generation means for generating a waveform screen clearly showing the correspondence between the effective range of the image signal and the signal level and the dynamic range based on the image signal and the range information;
Display means for displaying an output signal and a waveform screen;
A display device characterized by having. Signal input means for inputting an image signal having two gradation characteristics and a signal including additional information of the image signal;
A decoding unit that extracts an image signal and additional information from a signal input by the signal input unit;
Image processing means for generating an output signal from the image signal;
Range calculation means for calculating the effective range of the image signal having one of the gradation characteristics from the additional information;
Waveform generation means for generating a waveform screen clearly showing the effective range of the image signal having one of the gradation characteristics based on the image signal and the range information;
Display means for displaying an output signal and a waveform screen;
A display device characterized by having. The said waveform generation means displays the waveform of the image signal in an effective range, and the waveform of the image signal out of an effective range in a different display form, It is described in any one of the Claims 1 thru | or 3 characterized by the above-mentioned. Display device. The display device according to any one of claims 1 to 4, wherein the waveform generation unit scales and displays the waveform displayed on the waveform screen based on the range information.