Display Control Device

Abstract

To improve display quality when a part of an image is enlarged and displayed. [Solution] The display control device (14) includes an image acquisition unit (141) that acquires an image (I0), a display range acquisition unit (142) that acquires a display range (Av) that indicates the range to be displayed in the image, a magnification ratio acquisition unit (143) that acquires a magnification ratio (R) for enlarging a partial image (I0v) corresponding to the display range of the image, and an image quality adjustment unit (144) that adjusts the image quality of the image or partial image based on the magnification ratio.

Description

[Technical Field]

[0001] The present invention relates to a display control device that controls the display of video images. [Background technology]

[0002] A technology is known that prevents notification information included in a video from interfering with viewing of a main content (see Patent Document 1). In this technology, when a video content includes the main content and notification information superimposed along the outer edge of the main content, the notification information is detected, and the main content included in the video content from which the notification information was detected is enlarged and displayed according to the display size of a display unit. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-140596 Summary of the Invention [Problem to be solved by the invention]

[0004] However, as a result of investigations by the inventors, it has been found that the above-mentioned techniques tend to degrade the display quality of the enlarged image.

[0005] An object of one aspect of the present invention is to realize a display control device that improves display quality when a part of an image is enlarged and displayed. [Means for solving the problem]

[0006] In order to solve the above problem, a display control device according to one aspect of the present invention includes an image acquisition unit that acquires an image, a display range acquisition unit that acquires a display range indicating the range to be displayed in the image, a magnification ratio acquisition unit that acquires a magnification ratio for enlarging a partial image corresponding to the display range of the image, and an image quality adjustment unit that adjusts the image quality of the image or the partial image based on the magnification ratio. [Effects of the Invention]

[0007] According to one aspect of the present invention, it is possible to improve the display quality when a part of an image is enlarged and displayed. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a block diagram illustrating a display device according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a block diagram showing details of a control unit. [Figure 3] 1 is a flowchart showing the flow of a display method according to the first embodiment of the present invention. [Figure 4] 10A and 10B are diagrams illustrating an example of an image before and after enlargement processing. [Figure 5] FIG. 10 is a diagram illustrating an example of image quality adjustment based on a magnification ratio. [Figure 6] FIG. 10 is a block diagram illustrating details of a control unit according to a second embodiment of the present invention. [Figure 7] FIG. 10 is a diagram illustrating an example of a video for user operation. [Figure 8] FIG. 10 is a diagram showing an example of a selection image for allowing a user to select a position of the display range. [Figure 9] FIG. 10 is a diagram illustrating an example of an image including enlargement information indicating that the image is enlarged. [Figure 10] FIG. 10 is a diagram illustrating an example of an image including a part of a notification area. DETAILED DESCRIPTION OF THE INVENTION

[0009] [Embodiment 1] An embodiment of the present invention will be described in detail below. Fig. 1 is a block diagram showing a display device 10 according to the first embodiment of the present invention. As shown in Fig. 1, the display device 10 includes a tuner unit 11, a decoding unit 12, a recording / playback unit 13, a display control unit 14 (a control unit 14a, a signal processing unit 14bb), a display unit 15, and an input unit 16.

[0010] The tuner unit 11 receives broadcast programs broadcast by, for example, terrestrial digital broadcasting or satellite broadcasting. The tuner unit 11 may also receive data broadcasting including notification information (for example, breaking news of disasters, etc.) along with the broadcast programs.

[0011] The decoding unit 12 decodes the video content as a broadcast program received by the tuner unit 11 and the video content reproduced by the recording / reproducing unit 13, and outputs a video signal IS0.

[0012] The recording and playback unit 13 records video content received via the tuner unit 11, plays back the recorded video content, and outputs a playback signal to the decoding unit 12. The recording and playback unit 13 includes a storage device for recording video. The storage device may be, for example, a magnetic disk (e.g., a hard disk), an optical disk (e.g., a DVD or a Blu-ray disc), a RAM (random access memory), or a flash memory (e.g., an SSD: solid state drive). The recording and playback unit 13 may be located outside the display device 10. In this case, a playback signal related to the video content is supplied to the decoding unit 12 from outside the display device 10 via a cable terminal or the like.

[0013] The display control unit 14 controls the display of images on the display unit 15 and functions as a display control device. That is, a device (e.g., a display device, a television receiver, or a recording / playback device) having the display control unit 14 can generally function as a display control device. The display control unit 14 has a control unit 14a and a signal processing unit 14b.

[0014] The control unit 14a controls the signal processing unit 14b to control the display of images on the display unit 15. The control unit 14a includes, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), and a RAM. Details of the control unit 14a will be described later.

[0015] The signal processing unit 14b is controlled by the control unit 14a to process the video signal IS0 output from the decoding unit 12 to generate a video signal IS1. The signal processing unit 14b is controlled by the control unit 14a to perform image quality adjustment S14, enlargement processing S15, etc., which will be described later.

[0016] The display unit 15 is a display device, such as a liquid crystal display device or an EL display device, that displays an image based on the image signal IS1 output from the signal processing unit 14b.

[0017] The input unit 16 receives inputs (for example, operation instructions, setting instructions) from a user via a remote control (remote controller) 20, for example.

[0018] (Details of the control unit 14a) 2 is a block diagram showing details of the control unit 14a. As shown in FIG. 2, the control unit 14a has an image acquisition unit 141, a display range acquisition unit 142, a magnification ratio acquisition unit 143, an image quality adjustment unit 144, and an enlargement processing unit 145.

[0019] Fig. 3 is a flowchart showing an example of a video content display control method S10 by the control unit 14a, and Fig. 4 is a diagram showing an example of videos I0 and I1 before and after enlargement processing.

[0020] As shown in FIG. 3, the control unit 14a executes, as a display control method S10, acquisition of an image I0 S11, acquisition of a display range Av S12, acquisition of a magnification ratio R S13, adjustment of image quality S14, and magnification processing S15.

[0021] (1) Acquisition of video I0 S11 The video acquisition unit 141 acquires the video I0. More specifically, the video acquisition unit 141 sequentially acquires frame images included in the video signal IS0 output from the decoding unit 12, for example, via the signal processing unit 14b. The video I0 acquired by the video acquisition unit 141 may be a video received by the tuner unit 11 and output from the decoding unit 12, or a video recorded by the recording / playback unit 13 when played back.

[0022] As shown in Fig. 4, the video I0 may include a content area Ac that displays content and a notification area Ai that displays notification information. Fig. 4 shows an example in which the content area Ac and the notification area Ai are set to a display range Av and a non-display range An, respectively, as described below. As a result, the video I1 after the enlargement process S15, as shown in Fig. 4, is displayed with the video in the display range Av (partial video I0v corresponding to the display range Av of the video I0) enlarged.

[0023] The content area Ac is an area where, for example, content distributed as a broadcast program, such as images of plays, music, dramas, commentaries, discussions, news, etc., is displayed. The notification area Ai is an area where images of breaking news about disasters, etc. (for example, emergency earthquake alerts) and notification information that should be made known are displayed. The content area Ac is located near the center of the display unit 15, and the original content is displayed in a reduced size. The notification area Ai is, for example, an L-shaped area between the outer edge of the content area Ac and the periphery of the display unit 15. As a result, the user can view the original content and the notification information together.

[0024] As described above, the tuner unit 11 may receive broadcast information along with a broadcast program (content). In such a case, the decoding unit 12 combines the content data and the broadcast information to output a video signal IS0 representing a video I0 including a content area Ac and a broadcast area Ai.

[0025] (2) Acquisition of display range Av S12 The display range acquisition unit 142 acquires a display range Av that indicates the range to be displayed in the video I0.

[0026] The display range acquisition unit 142 may acquire the display range Av by acquiring the non-display range An. The non-display range An indicates the range that is not displayed in the video I0. By removing the non-display range An from the video I0, a partial video I0v corresponding to the display range Av of the video I0 can be obtained. The video of the non-display range An is also referred to as a second partial video I0n.

[0027] The data of the partial video I0v can be obtained, for example, by extracting data corresponding to the display range Av from the data of the video I0. Alternatively, it is also possible to maintain the data of the video I0 and treat a portion of that data as the data of the partial video I0v. For example, the data of the partial video I0v can be identified by combining the data of the video I0 with data indicating the coordinates of the display range Av of the video I0 (hereinafter referred to as "coordinate data"). In other words, both (1) the data of the extracted partial video 10v and (2) the combination of the data of the video I0 and the coordinate data can be transmitted and used within the display device 10 as the data of the partial video I0v.

[0028] The video I0 includes a notification area Ai that displays notification information, and a non-display area An in the video I0 that is not displayed may include at least a part of the notification area Ai. As described above, in the example of Fig. 4, the non-display area An coincides with the notification area Ai, and the display area Av coincides with the content area Ac.

[0029] The display range Av (or the non-display range An) can be acquired by various methods. For example, the display range acquisition unit 142 may acquire the display range Av by performing image processing on the video I0 (processing the video signal IS0). For example, the display range acquisition unit 142 can detect the notification area Ai from the video based on the shape, color, and arrangement pattern of the notification area Ai, and set the area of ​​the video I0 excluding this as the display range Av.

[0030] The notification area Ai may have an arrangement pattern such as non-display areas An1 to An4 of the respective images SA1 to SA4 shown in Fig. 8, which will be described later. That is, there may be, for example, four patterns depending on whether the notification area Ai is arranged on the upper or lower side, and on the left or right side of the image. The display range acquisition unit 142 detects such an arrangement pattern, sets a non-display area An, and can set the area of ​​the image I0 excluding this non-display area An as the display range Av.

[0031] In this case, the display range acquisition unit 142 identifies which of a plurality of patterns the notification area Ai corresponds to, but does not need to identify the top, bottom, left, and right widths of the notification area Ai. As will be described later, the user may set the top, bottom, left, and right widths of the notification area Ai based on the pattern of the notification area Ai detected by the display range acquisition unit 142.

[0032] On the other hand, the display range acquisition unit 142 may identify which of a plurality of patterns the notification area Ai corresponds to, and the vertical and horizontal widths of the notification area Ai.

[0033] Furthermore, the display range acquisition unit 142 may identify the vertical and horizontal widths of the notification area Ai without identifying which of the multiple patterns the notification area Ai corresponds to.

[0034] Here, the display range acquisition unit 142 sets the content area Ac as the display range Av. However, as described above, the display range acquisition unit 142 may set a part of the notification area Ai as the display range Av in addition to the content area Ac.

[0035] (3) Obtaining the magnification ratio R S13 The magnification ratio acquisition section 143 acquires a magnification ratio R for enlarging the partial image I0v corresponding to the display range Av of the image I0. The magnification ratio acquisition section 143 may determine the magnification ratio R based on, for example, the original size G0 of the image I0 and the size Gv of the partial image I0v.

[0036] For example, the following (1) and (2) can be used as the sizes G0 and Gv. (1) The sizes G0 and Gv are the sizes (areas) on the screen of the display unit 15. (2) The sizes G0 and Gv are expressed as the number of pixel dots. For example, if the image I0 is expressed as 1000*1000 dots and the partial image I0v is expressed as 800*800 dots, the sizes G0 and Gv may be set to 1000*1000 and 800*800, respectively.

[0037] In either of (1) and (2), the magnification ratio R can be calculated as "R=S0 / Sv." Alternatively, "R=[(S0 / Sv)-1]*100" may be used.

[0038] (4) Adjusting the image quality S14 The image quality adjustment unit 144 adjusts the image quality of the video I0 or the partial video I0v based on the magnification ratio R. This means that the image quality adjustment unit 144 may (1) adjust the image quality of the partial video I0v itself, or (2) adjust the image quality of the video I0 that includes the partial video I0v, thereby adjusting the image quality of the partial video I0v.

[0039] The image quality adjustment may be at least one of the following (1) and (2). (1) Clarifying the boundaries between light and dark areas in an image: When a light area and a dark area are adjacent to each other in an image, this is a process for clarifying these boundaries. For example, this includes sharpness, contrast, etc. (2) Reduction of noise in images: Processing to reduce noise when the image contains noise, such as noise reduction and false contour correction. The false contour correction is a process for reducing false contours that may occur due to noise or the like.

[0040] FIG. 5 is a diagram showing an example of image quality adjustment based on the magnification ratio. Here, sharpness and noise reduction are given as examples of image quality adjustment. In FIG. 5, sharpness refers to a parameter that indicates the degree of clarity of the boundaries between light and dark in the image. Noise reduction refers to a parameter that indicates the degree of noise reduction in the image. The magnification ratio R is calculated using "R=[(S0 / Sv)-1]*100".

[0041] In this example, under normal circumstances, that is, when the image is displayed as is without any cuts (no enlargement, enlargement rate R=0%), the sharpness is 0 and the noise reduction is weak. In contrast, as the enlargement rate R increases from 3 to 10%, the sharpness increases from 1 to 4 and the noise reduction increases from weak+ to strong.

[0042] The reason for this can be explained as follows: In enlarged display, a partial image I0v of the image I0 is enlarged and displayed. For this reason, compared to normal display, in enlarged display, as the screen magnification ratio increases, it is thought that blurring and noise in the image become more noticeable to the user. For this reason, by increasing sharpness and noise reduction according to the image magnification ratio, it is possible to make blurring and noise in the image less noticeable. In this way, by adjusting the image quality of the partial image I0v based on the magnification ratio R, it is possible to improve the image quality of the enlarged image I1.

[0043] Here, the image quality adjustment unit 144 may adjust the image quality of the partial image I0v. That is, the image quality adjustment unit 144 may adjust the image quality not of the entire image I0 but of only the partial image I0v. This means that the image data of the non-display area An is ignored when adjusting the image quality.

[0044] If the image of the entire video I0 acquired by the video acquisition unit 141 is adjusted, the processing result of the video in the display range Av may be affected by the video in the non-display range An, which may result in insufficient image quality adjustment. For example, consider combining the video in the content area Ac and the video in the notification area Ai to clarify the boundaries between light and dark in the video (sharpness) and reduce noise in the video (noise reduction). In this case, the boundaries in the displayed video may become unclear, areas that are not actual boundaries may be emphasized, or noise in the video may be emphasized.

[0045] In this way, adjusting the image quality of areas that are not actually displayed makes it difficult to effectively improve the image quality. By ignoring the image data of the non-display area An when processing the image of the display area Av, it is possible to effectively adjust the image quality of the image of the display area Av (partial image I0v).

[0046] (5) Enlargement process S15 The enlargement processing unit 145 may enlarge the partial video I0v to the size of the video I0. For example, the enlargement processing unit 145 enlarges and displays the partial video I0v on the display unit 15. In detail, the enlargement processing unit 145 controls the signal processing unit 14b to process the video signal IS0, thereby generating a video signal IS1 corresponding to the enlarged partial video I0v, for example, the video I1 in FIG. 4.

[0047] For ease of understanding, the image quality adjustment S14 and the enlargement process S15 have been described in this order. This order may be reversed, or the two processes may be performed simultaneously. Either of these forms is within the scope of this embodiment.

[0048] The display control unit (display control device) 14 according to this embodiment includes an image acquisition unit 141 that acquires an image I0, a display range acquisition unit 142 that acquires a display range Av that indicates the range to be displayed in the image I0, a magnification ratio acquisition unit 143 that acquires a magnification ratio R for enlarging a partial image I0v that corresponds to the display range Av of the image I0, and an image quality adjustment unit 144 that adjusts the image quality of the image I0 or the partial image I0v based on the magnification ratio R. Adjusting the image quality of the image I0 or the partial image I0v based on the magnification ratio R makes it possible to improve the image quality when the image is enlarged.

[0049] [Embodiment 2] Other embodiments of the present invention will be described below. For ease of explanation, the same reference numerals will be used to designate components having the same functions as those described in the above embodiment, and the description thereof will not be repeated.

[0050] 6 is a block diagram showing a control unit 14a of a display device 10 according to embodiment 2 of the present invention. As shown in FIG. 6, the control unit 14a has a cancellation processing unit 146, a guidance unit 147, a selection processing unit 148, and a change processing unit 149 in addition to an image acquisition unit 141, a display range acquisition unit 142, a magnification ratio acquisition unit 143, an image quality adjustment unit 144, and an enlargement processing unit 145.

[0051] Here, the input unit 16 functions as an input unit that accepts user input for setting the display range Av. Specifically, the input unit 16 accepts user input of keys Ka, Kb, Ku, Kd, ​​Kr, and Kl on the remote control 20. The key Ka is, for example, a "yellow" button. The key Kb is, for example, a "determine" button. The keys Ku, Kd, ​​Kr, and Kl are up (↑), down (↓), left (←), and right (→) arrow buttons, respectively.

[0052] FIG. 7 shows images I11 to I13 for user operations.

[0053] Image I11 is a screen for enlarging and displaying the image by enlargement processing unit 145. The user operates keys Ku and Kd (up and down arrow buttons) to select "enlarged display" and presses key Kb ("decide" button), whereby enlargement and display of the image by enlargement processing unit 145 is executed.

[0054] Image I12 is an image for canceling the enlargement of the image by enlargement processing unit 145. Cancellation processing unit 146 displays image I12 as an image for canceling the enlargement of the image by enlargement processing unit 145. The user can cancel the enlarged display of the image by enlargement processing unit 145 by operating keys Ku and Kd (up and down arrow buttons) to select "Cancel enlarged display" and pressing key Kb ("OK" button). The image enlarged by enlargement processing unit 145 (e.g., image I1 in FIG. 4) returns to the image before enlargement (e.g., image I0 in FIG. 4).

[0055] Image I13 is an example of a guidance image including guidance G for assisting the user in setting the display range Av. Guidance unit 147 displays image I13 as a guidance image including guidance G for assisting the user in setting the display range Av.

[0056] The guidance video I13 includes a content area Ac that displays content and a guidance area Ag that displays guidance G. The guidance G indicates the relationship between the keys Ka, Kb, Ku, Kd, ​​Kr, and Kl of the remote control 20 and the selected process (changing the position, size, or enlarging the display area Av (or non-display area An)).

[0057] The guidance area Ag and the content area Ac may have at least one of the following relationships (1) and (2) as shown in image I13. In image I13 shown in FIG. 7, both of these relationships (1) and (2) are present. (1) At least a portion of the guidance region Ag overlaps at least a portion of the content region Ac, which makes it easy to clarify the content region A without reducing the size of the content region Ac. (2) The guidance area Ag and the content area Ac have different colors, which makes it easy to distinguish between the guidance area Ag and the content area Ac.

[0058] 8 shows an example of selection images SA1-SA4 for allowing the user to select the position of display range Av. Selection processing unit 148 displays selection images SA1-SA4 for allowing the user to select the position of display range Av together with at least a part of image I0. This allows the user to easily select the position of display range Av based on selection images SA1-SA4.

[0059] Images SA1 to SA4 have non-display areas An1 to An4, respectively. Non-display areas An1 to An4 are arranged at the upper and left, upper and right, lower and right, and lower and left sides of the images, respectively. The areas of images SA1 to SA excluding non-display areas An1 to An4 are display areas Av1 to Av4.

[0060] The user can switch between the displayed selection images SA1 to SA4 by pressing the key Ka (yellow button). Each time the key Ka is pressed, the selection images SA1 to SA4 are switched in order. The selection images SA1 to SA4 form a loop, with selection image SA1 appearing after selection image SA4.

[0061] The user can select the images SA1 to SA4 and press the key Kb ("OK" button) to determine the display range Av1 to Av4, that is, the position of the display range Av.

[0062] The change processing unit 149 displays a change screen for accepting a change of the size of the display range Av by the user. Here, the selection images SA1 to SA4 also serve as the change screen, and the user can change the size of the display range Av using the selection images SA1 to SA4.

[0063] The display ranges Av1 to Av4 (non-display ranges An1 to An4) are defined by either the upper boundary line Lu or the lower boundary line Ld, and either the left boundary line Ll or the right boundary line Lr. In the selection images SA1 to SA4, the user operates the keys Ku, Kd, ​​Kr, and Kl to change the size of the display range Av as follows: As shown below, the user can easily change the size of the display range Av based on the direction of the arrows of the keys Ku, Kd, ​​Kr, and Kl.

[0064] The key Ku (↑) moves the upper boundary line Lu and the lower boundary line Ld upward. As a result, the display ranges Av1 and Av2 become wider in the images SA1 and SA2, and the display ranges Av3 and Av4 become wider in the images SA3 and SA4.

[0065] The key Kd (↓) moves the upper boundary line Lu and the lower boundary line Ld downward. As a result, the display ranges Av1 and Av2 become narrower in the images SA1 and SA2, and the display ranges Av3 and Av4 become wider in the images SA3 and SA4.

[0066] The key Kl (←) moves the left boundary line Ll and the right boundary line Lr to the left. As a result, the display ranges Av1 and Av4 become wider in the images SA1 and SA4, and the display ranges Av2 and Av3 become narrower in the images SA2 and SA3.

[0067] The key Kr (→) moves the left boundary line Ll and the right boundary line Lr to the right. As a result, the display ranges Av1 and Av4 become narrower in the images SA1 and SA4, and the display ranges Av2 and Av3 become wider in the images SA2 and SA3.

[0068] [Embodiment 3] Other embodiments of the present invention will be described below. For ease of explanation, the same reference numerals will be used to designate components having the same functions as those described in the above embodiment, and the description thereof will not be repeated.

[0069] In the third embodiment, the partial image I0v (image I1) enlarged by the enlargement processing unit 145 includes at least one of characters, symbols, and figures indicating that the image is enlarged. This allows the user to easily recognize that the image I1 has been enlarged, and therefore that the original image I0 includes notification information.

[0070] 9 is a diagram showing an example of an image including enlargement information indicating that the image has been enlarged. In this example, the enlarged image includes a caution P for "enlarged display" as text indicating that the image has been enlarged. The text indicating that the image has been enlarged is not limited to text, and may be a symbol or a graphic.

[0071] When an image is displayed with the notification area Ai cut out, it becomes difficult for the user to determine whether the original image includes the notification area Ai (notification information). By including text or the like indicating that the image is enlarged in the image, the user can easily determine that the original image includes notification information. Note that instead of the text, symbol, or graphic indicating that the image is enlarged, any of text, symbol, or graphic indicating that the original image 10 includes notification information, such as "Earthquake Early Warning," may be displayed.

[0072] [Embodiment 4] Other embodiments of the present invention will be described below. For ease of explanation, the same reference numerals will be used to designate components having the same functions as those described in the above embodiment, and the description thereof will not be repeated.

[0073] In the fourth embodiment, the video I0 includes a notification area Ai that displays notification information, and the partial video I0v (video I1) enlarged by the enlargement processing unit 145 includes a portion Ai1 (second portion) of the notification area Ai. FIG. 10 is a diagram showing an example of a video including a portion of the notification area Ai. Here, the enlarged video includes the portion Ai1 of the notification area Ai. That is, the content area Ac and the portion Ai1 of the notification area Ai are included in the display range Av, and the other portion Ai2 of the notification area Ai is included in the non-display range An. The portion Ai1 of the notification area Ai allows the user to easily determine that the original video I0 includes notification information.

[0074] Here, the partial image I0v (image I1) enlarged by the enlargement processing unit 145 may display a portion Ai1 of the notification area Ai lighter than the original image of the notification area Ai. As a result, for example, the characters in the notification area Ai can be made less noticeable, and the visibility of the content area Ac can be improved. This can be achieved, for example, by (1) differentiating the sharpness intensity between the content area and the notification area Ai in the display area, and (2) lowering the sharpness intensity in the enlargement processing S15.

[0075] The partial image I0v (image I1) enlarged by the enlargement processing unit 145 includes the second portion of the notification area Ai and the content area Ac that displays the content, and the image quality adjustment unit 144 may adjust the image quality of the second portion of the notification area Ai to a different degree than that of the content area Ac. This makes it possible to make the text in the second portion of the notification area Ai less noticeable, for example, and improve the visibility of the content area Ac.

[0076] The image quality adjustment unit 144 may vary the degree of image quality adjustment depending on whether the partial image I0v (image I1) enlarged by the enlargement processing unit 145 includes the notification area Ai or not. This makes it possible, for example, to make the text in the notification area Ai less noticeable when the partial image I0v (image I1) includes the notification area Ai, thereby improving the visibility of the content area Ac.

[0077] [Modification] Other embodiments of the present invention will be described below. For ease of explanation, the same reference numerals will be used to designate components having the same functions as those described in the above embodiment, and the description thereof will not be repeated.

[0078] The display control unit 14 may perform at least one of (1) adding an interpolation frame between adjacent video frames and (2) changing a gamma curve to adjust the luminance distribution of the video, based on the partial video I0v.

[0079] The video signal IS0 generally includes multiple video frames in a time series. For example, a moving image is displayed on the display unit 15 by displaying 60 video frames per second. Here, interpolation frames may be added between adjacent video frames to increase the number of frames per unit time. Adding interpolation frames makes it possible to generate moving images with smoother motion. An example of the process of adding interpolation frames is MEMC (Motion Estimation Motion Compensation).

[0080] When adding an interpolation frame in this way, it is preferable to add the interpolation frame to the partial video I0v (video corresponding to the display range Av of the video I0). If an interpolation frame is added to the video I0 including the non-display range An (particularly the notification area Ai), the added interpolation frame may not be consistent with the previous and next video frames.

[0081] This is because the generation of interpolated frames is based on motion vectors that represent movement between video frames. That is, the video of the content area Ac and the notification area Ai is unrelated, and the movement in the content area Ac does not correspond to the movement in the notification area Ai, so the generated motion vector may not correspond well to the movement of the entire video. In this case, adding an interpolated frame would actually result in a decrease in the display quality of the video. For example, it would be difficult to see the text scrolling in the notification area Ai. In response to this, the display quality of the video can be improved by removing the notification area Ai from the video as a non-display area An and then adding an interpolated frame.

[0082] The gamma curve may be changed to adjust the brightness distribution of the image. The gamma curve is a table that shows the relationship between the grayscale values ​​of the video signal IS0 and the brightness on the display unit 15. By changing the gamma curve, the brightness distribution of the image can be adjusted, reducing unevenness in the brightness distribution and making the image easier to view. Active contrast processing is one example of such adjustment of the brightness distribution of the image.

[0083] When adjusting the brightness distribution of the image in this way, it is preferable to adjust the brightness distribution of the image in the partial image I0v. Adjusting the brightness distribution of the image I0 including the non-display area An (particularly the notification area Ai) may cause a bias in the brightness distribution of the image after adjustment, which may make the image more difficult to see.

[0084] This is because the adjustment of the image's luminance distribution (change of the gamma curve) is performed based on the image's gradation histogram. A gradation histogram is data that represents the distribution of image gradations, and a gradation histogram generated including the non-display area An that is not ultimately displayed will contain noise compared to the gradation histogram of the image in the display area Av (partial image I0v). In response to this, adjusting the image's luminance distribution in the partial image I0v that corresponds to the display area Av of the image I0 can improve the image display quality.

[0085] [Software implementation example] The functions of the control unit 14a (hereinafter referred to as the "device") can be realized by a program for causing a computer to function as the device, and by a program for causing a computer to function as each control block of the device (in particular, the image acquisition unit 141, the display range acquisition unit 142, the magnification ratio acquisition unit 143, the image quality adjustment unit 144, the magnification processing unit 145, the release processing unit 146, the guidance unit 147, the selection processing unit 148, and the change processing unit 149).

[0086] In this case, the device includes a computer having at least one control device (e.g., a processor) and at least one storage device (e.g., a memory) as hardware for executing the program. The control device and storage device execute the program, thereby realizing the functions described in each of the above embodiments.

[0087] The program may be non-transitory and may be recorded on one or more computer-readable recording media. The recording media may or may not be included in the device. In the latter case, the program may be supplied to the device via any wired or wireless transmission medium.

[0088] Furthermore, some or all of the functions of the control blocks can be realized by logic circuits. For example, an integrated circuit in which a logic circuit that functions as each of the control blocks is formed is also included in the scope of the present invention. In addition, the functions of the control blocks can also be realized by, for example, a quantum computer.

[0089] 〔summary〕 A display control device according to aspect 1 of the present invention includes an image acquisition unit that acquires an image, a display range acquisition unit that acquires a display range indicating the range to be displayed in the image, a magnification ratio acquisition unit that acquires a magnification ratio for enlarging a partial image corresponding to the display range of the image, and an image quality adjustment unit that adjusts the image quality of the image or the partial image based on the magnification ratio.

[0090] According to the above configuration, the image quality of the image is adjusted based on the enlargement ratio of the image, thereby improving the image quality of the image after enlargement processing.

[0091] A display control device according to a second aspect of the present invention may be the display control device according to the first aspect, further including an enlargement processing unit that enlarges the partial video to the size of the video.

[0092] According to the above configuration, the partial video can be enlarged to the size of the video.

[0093] A display control device according to aspect 3 of the present invention may be such that, in aspect 1 or 2 above, the image includes a notification area for displaying notification information, and a non-display area indicating an area in the image that is not to be displayed includes at least a portion of the notification area.

[0094] According to the above configuration, the non-display range includes at least a part of the notification area, thereby limiting the notification area included in the partial image, thereby improving the image quality of the image after enlargement processing.

[0095] A display control device according to a fourth aspect of the present invention is any one of the first to third aspects, wherein the image quality adjustment unit adjusts the image quality of the partial video.

[0096] According to the above configuration, the image quality of the partial image is adjusted, thereby making it possible to further improve the image quality of the image after enlargement processing.

[0097] A display control device according to a fifth aspect of the present invention is any one of the first to fourth aspects, wherein the display range acquisition unit acquires the display range by performing image processing on the video.

[0098] According to the above configuration, by performing image processing on the video, for example, it is possible to detect a notification area and obtain a non-display area corresponding to the notification area.

[0099] The display control device according to a sixth aspect of the present invention is based on any one of the first to fifth aspects and may further include an input unit that accepts an input from a user for setting the display range.

[0100] According to the above configuration, the user can set the display range as appropriate.

[0101] A display control device according to aspect 7 of the present invention may, in any of aspects 1 to 6 above, include a selection processing unit that displays a selection image for allowing a user to select a position of the display range together with at least a portion of the image.

[0102] According to the above configuration, the user can select the position of the display range using the selection video while watching the video.

[0103] The display control device according to an eighth aspect of the present invention is the display control device according to any one of the first to seventh aspects, and may further include a change processing unit that displays a change screen for accepting a change of the size of the display range by the user.

[0104] According to the above configuration, the user can change the size of the display range using the change screen.

[0105] A display control device according to aspect 9 of the present invention, in any of aspects 1 to 8 above, includes a guidance unit that displays a guidance video including guidance to assist a user in setting the display range, wherein the guidance video includes a content area that displays content and a guidance area that displays the guidance, and the guidance area and the content area may have at least one of the following relationships (1) and (2). (1) At least a portion of the guidance area overlaps with at least a portion of the content area. (2) The guidance area and the content area have different colors.

[0106] According to the above configuration, either of the following (1) or (2) becomes possible. (1) At least a portion of the guidance area overlaps at least a portion of the content area, so that it is easy to clarify the content area A without reducing the content area Ac. (2) The guidance area and the content area have different colors, which makes it easy to distinguish between the guidance area Ag and the content area Ac.

[0107] The display control device according to a tenth aspect of the present invention may be the display control device according to the second aspect, further including a cancellation processing unit that displays an image for canceling the enlargement of the image by the enlargement processing unit.

[0108] According to the above configuration, the user can cancel the enlargement of the image by using this image.

[0109] A display control device according to aspect 11 of the present invention may be such that, in aspect 2 or 10 above, the partial image enlarged by the enlargement processing unit includes at least one of characters, symbols, and figures indicating that the image has been enlarged.

[0110] According to the above configuration, the user can recognize that the notification area is not being displayed by the characters or the like indicating that the image is enlarged.

[0111] A display control device according to aspect 12 of the present invention is any of aspects 2, 10, and 11 above, wherein the image includes a notification area that displays notification information, and the partial image enlarged by the enlargement processing unit may include a second portion of the notification area.

[0112] According to the above configuration, the user can recognize the existence of the notification area because the video includes part of the notification area.

[0113] A display control device according to aspect 13 of the present invention may be such that, in aspect 12 above, the partial image enlarged by the enlargement processing unit displays the second part of the notification area lighter than the original image of the notification area.

[0114] According to the above configuration, the second portion of the notification area is displayed lighter than the original image of the notification area, thereby improving the visibility of the content.

[0115] A display control device according to aspect 14 of the present invention is such that, in aspect 12 above, the partial image enlarged by the enlargement processing unit includes a second part of the notification area and a content area for displaying content, and the image quality adjustment unit may vary the degree of image quality adjustment between the second part of the notification area and the content area.

[0116] According to the above configuration, by varying the degree of image quality adjustment between the second portion of the notification area and the content area, it is possible to improve the ease of viewing the content.

[0117] A display control device according to aspect 15 of the present invention may be such that, in aspect 12 above, the image quality adjustment unit varies the degree of image quality adjustment depending on whether the partial image enlarged by the enlargement processing unit includes the notification area or not.

[0118] According to the above configuration, the degree of image quality adjustment is varied depending on whether the enlarged partial video includes the notification area or not, thereby making it possible to improve the ease of viewing the content.

[0119] A display control device according to a sixteenth aspect of the present invention is any one of the above-mentioned aspects 1 to 15, and the image quality adjustment may be at least one of the following (1) and (2). (1) Clarifying the boundaries between light and dark in the image (2) Reducing noise in the video

[0120] According to the above configuration, it is possible to clarify the boundaries between light and dark in the image.

[0121] A display control device according to aspect 17 of the present invention may, in any of aspects 1 to 16 above, perform at least one of (1) adding an interpolated frame between adjacent image frames and (2) changing a gamma curve to adjust the brightness distribution of the image based on the partial image.

[0122] According to the above configuration, it is possible to improve the visibility of the video by adding an interpolation frame or by changing the gamma curve.

[0123] A display control device according to an eighteenth aspect of the present invention is any one of the first to seventeenth aspects, wherein the video is a video obtained by playing back a recorded video.

[0124] According to the above configuration, it is possible to improve the image quality of the reproduced video after enlargement processing.

[0125] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. Furthermore, new technical features can be formed by combining the technical means disclosed in each embodiment. [Explanation of symbols]

[0126] 10 Display device 11 Tuner section 12 Decoding section 13 Recording and playback section 14 Display control unit 14a Control section 14b Signal processing section 141 Video acquisition unit 142 Display range acquisition unit 143 Magnification ratio acquisition unit 144 Image quality adjustment section 145 Enlargement processing section 146 Release processing unit 147 Guidance Department 148 Selection processing section 149 Change Processing Section 15 Display section 16 Input section 20 Remote Control I0 Video I0v Partial video Ac Content Area Ai notification area An, An1~An3 hidden range Av display area Lu upper border Ld lower border Ll left border Lr right border S10 display control method S11 Video Acquisition S12 Get display range S13 Get magnification ratio S14 Picture Quality Adjustment S15 Enlargement processing

Claims

1. An image acquisition unit that acquires a plurality of images represented by a plurality of image frames in time series; a display range acquisition unit that acquires a display range indicating a range to be displayed on a display unit in the plurality of images; an interpolation frame adding unit that adds an interpolation frame between a plurality of video frames corresponding to a first plurality of partial videos that are the plurality of videos within the display range; a magnification ratio acquisition unit that acquires magnification ratios for enlarging a second plurality of partial images represented by the plurality of image frames to which the interpolated frame has been added; an image quality adjustment unit that adjusts image quality of the second plurality of partial images based on the enlargement ratio; an enlargement processing unit that enlarges the second plurality of partial images to the size of the plurality of images; A display control device comprising:

2. the plurality of images include a notification area for displaying notification information; The display control device according to claim 1 , wherein a non-display area indicating an area not to be displayed in the plurality of videos includes at least a part of the notification area.

3. The display control device according to claim 1 , wherein the display range acquisition unit acquires the display range by performing image processing on the plurality of videos.

4. The display control device according to claim 1 , further comprising an input unit that accepts an input from a user for setting the display range.

5. The display control device according to claim 1 , further comprising a selection processing unit that displays a selection image for allowing a user to select a position of the display range together with at least some of the plurality of images.

6. The display control device according to claim 1 , further comprising a change processing unit that displays a change screen for accepting a change in the size of the display range by a user.

7. a guidance unit that displays a guidance video including guidance for assisting a user in setting the display range, the guidance video includes a content area for displaying content and a guidance area for displaying the guidance; The display control device according to claim 1 , wherein the guidance area and the content area have at least one of the following relationships (1) and (2): (1) At least a portion of the guidance area overlaps with at least a portion of the content area. (2) The guidance area and the content area have different colors.

8. The display control device according to claim 1 , further comprising a cancellation processing unit that displays an image for canceling the image enlargement performed by the enlargement processing unit.

9. The display control device according to claim 1 , wherein the second plurality of partial images enlarged by the enlargement processing unit include at least one of a character, a symbol, and a graphic that indicates that the image is enlarged.

10. The display control device according to claim 2 , wherein the second plurality of partial images enlarged by the enlargement processing unit include another part of the notification area.

11. The display control device according to claim 10 , wherein the second plurality of partial images enlarged by the enlargement processing unit display the other part of the notification area lighter than the original image of the notification area.

12. the second plurality of partial images enlarged by the enlargement processing unit include the other part of the notification area and a content area displaying content, The display control device according to claim 10 , wherein the image quality adjustment unit adjusts the image quality of the other part of the notification area and the content area to different degrees.

13. The display control device according to claim 10, wherein the image quality adjustment unit varies the degree of image quality adjustment depending on whether the second plurality of partial images enlarged by the enlargement processing unit include the notification area or not.

14. 3. The display control device according to claim 1, wherein the image quality adjustment is at least one of the following (1) and (2). (1) Clarifying the boundaries between light and dark in the image (2) Reducing noise in the image

15. The display control device according to claim 1 , further comprising: a gamma curve for adjusting a luminance distribution of an image, the gamma curve being changed based on the second plurality of partial images.

16. The display control device according to claim 1 , wherein the plurality of images are images obtained by playing back recorded images.

Images