JP2009027605A - Optical disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk device which makes it possible to easily view characters of a caption even if an original video image played back from an optical disk has any color. <P>SOLUTION: In the case of being set in a caption color switching mode, background color data (color data of a background 44, for example) and character color data (color data of characters ABC, for example) are extracted from an optical disk during playback, and caption contrast is extracted using these color data. If the background color data are determined as data indicating that the background color data are set within a predetermined range of transparency based on the extracted caption contrast, the background color data are modified. The credit is then displayed on a screen 46 with a background 45 of the color indicated by the modified background color data (color data of a background 45) and the characters ABC of the color indicated by the character color data. Therefore, the characters ABC of the caption can be easily viewed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an optical disc apparatus for reproducing or recording / reproducing information with respect to an optical disc, and more particularly to a function for displaying subtitles.

In recent years, a DVD (Digital Versatile Disc), which is an optical disc, has been developed and spread. In such a DVD, sub-picture data can be recorded in addition to video data and audio data corresponding to the video data. Then, subtitle data is recorded on the DVD as sub-picture data, so that in the optical disc apparatus, the subtitle is superimposed on the original video and displayed on the display device as necessary.
Japanese Patent Laid-Open No. 10-42219 Japanese Patent Application Laid-Open No. 2005-269677 Japanese Patent Laid-Open No. 7-30812

  However, in the conventional optical disc apparatus, subtitle data recorded on an optical disc such as a DVD is read. However, since the subtitle text color and background color are determined according to the color code included in the subtitle data, the subtitle background color is determined. When there is a scene where the character color of the subtitle is transparent and the color of the subtitle is the same or close to the color of the original video, the user has a problem that it is difficult to see the subtitle character.

  In the prior art of Patent Document 1, the program selection important information display area is displayed in a color different from the adjacent area in a state where the image of the electronic program guide can be seen through as a background image. Not disclosed.

  In the prior art of Patent Document 2, the transparency value of the background video is set to the background color so that the background video can be seen through, but this conventional technology also does not disclose subtitles.

  In the prior art disclosed in Patent Document 3, the background portion is replaced with a desired color during zoom-up display, and a subtitle display screen that makes subtitles easy to read is displayed at the bottom of the high-definition display screen. The processing for changing the color of the closed caption is not disclosed.

  The present invention has been made to solve the above-described problems, and provides an optical disc apparatus capable of making subtitle characters easy to see regardless of the color of the original video reproduced from the optical disc. The purpose is to do.

  In order to achieve the above object, the invention of claim 1 is a subtitle which is a mode for changing the background color data included in the subtitle data read from the optical disk and switching the background color of the subtitle displayed on the display device. When the color switching mode is set, color data extracting means for extracting background color data and character color data relating to subtitles from the optical disc during playback, and subtitle contrast is extracted based on the background color data and character color data Subtitle contrast extracting means, transparency determining means for determining whether or not the background color data is within a predetermined transparency range based on the extracted subtitle contrast, and the background color data A color data changing method for changing the background color data when it is determined that the data is within a predetermined transparency range. And a subtitle display processing unit for displaying subtitles on a display device using the background color of the changed background color data and the characters of the color indicated by the character color data. An optical disc apparatus is provided.

  According to this configuration, when the subtitle color switching mode is set, when the background color data related to the subtitle read from the optical disc at the time of reproduction is within a predetermined transparency range, the background color is set so that the subtitle characters are easy to see. In order to change the background color data, the background of the subtitle is displayed on the display device, so that it is easy to see the text of the subtitle regardless of the color of the original video reproduced from the optical disc. It is possible to reduce the stress of reading subtitle characters when the user is watching a movie or the like.

  According to a second aspect of the present invention, in the first aspect of the invention, the change of the background color data by the color data changing means is performed between the character color of the subtitle and the background color of the subtitle so that the character can be easily seen with respect to the subtitle background. Since the character color code indicating the relationship and the background color code are referred to in advance, the character color code corresponding to the character color data of the subtitle read from the optical disc is known. The background color code corresponding to the code can be searched, so that even if the background color data recorded in advance on the optical disc is read, it can be changed to the background color data indicating the background color opposite to the character color. become.

  In the invention of claim 3, in the invention of claim 1, whether or not the background color data is within a predetermined transparency range is determined by whether or not the caption contrast is lower than a predetermined value. Can be determined whether or not the background color data of the caption is within a predetermined transparency range.

  As described above, according to the present invention, when the subtitle color switching mode is set, the subtitle characters are easy to see when the background color data related to the subtitle read from the optical disc at the time of reproduction is within a predetermined transparency range. In order to change the background color, the background color data is changed so that the background of the subtitle is displayed on the display device, so the subtitle text can be displayed regardless of the color of the original video reproduced from the optical disc. It is possible to reduce the stress of reading subtitle characters when the user views a movie or the like.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a block diagram showing a configuration of a DVD recorder as an optical disk apparatus according to an embodiment of the present invention. Here, a DVD recorder will be described as an optical disk device, but it goes without saying that the caption display processing unit, which is a feature of the present embodiment, can be applied even if the optical disk device is a DVD player.

  In FIG. 1, this DVD recorder includes a system controller 22 that controls the entire apparatus, a spindle motor 5 that rotates an optical disk 1 such as a DVD or a CD, and light that optically writes / reads information to / from the optical disk 1. The spindle motor 5 and the sled 3 are driven through the motor drive circuit 34 according to an instruction from the pickup 2, the sled 3 for moving the optical pick-up 2 in the radial direction of the optical disc 1, and the instruction of the system controller 22, and the light A servo control unit 4 that performs control to move the focal position of the laser beam in the vertical direction and the horizontal direction with respect to the recording surface of the optical disc 1 by moving an objective lens (not shown) built in the pickup 2; Yes.

  The DVD recorder also includes an RF amplifier 6 that amplifies an RF signal that is a read signal from the optical pickup 2 during reproduction of the optical disc 1, and an optical disc 1 that converts the RF signal output from the RF amplifier 6 into digital data. The digital signal processing unit 8 stores the data generated by performing the signal demodulation processing and error correction processing according to the data format in the RAM 7 serving as a buffer memory, and outputs from the digital signal processing unit 8 according to an instruction from the system controller 22 A stream separator 9 for separating audio data, sub-picture data, and video data from the data stream.

  The DVD recorder also receives audio data output from the stream separation unit 9 and performs a predetermined decoding process, and temporarily stores data for performing the decoding process by the audio decoder 11. The RAM 10, the sub-picture decoder 13 that inputs the sub-picture data output from the stream separation unit 9 and performs a predetermined decoding process, and temporarily stores the data to perform the decoding process by the sub-picture decoder 13 A RAM 12 that receives the video data output from the stream separation unit 9 and performs a decoding process using MPEG or the like, and a RAM 14 that temporarily stores the data for the decoding process in the video decoder 15. And.

  The DVD recorder also synthesizes the data output from the video decoder 15 and the data output from the sub-picture decoder 13 in response to an instruction from the system controller 22, and the video processor 17 outputs the video processor 17. For example, the video encoder 18 converts the synthesized data into a video signal for display and displays the image on the display device 20, and converts the data output from the audio decoder 11 into an analog audio signal, for example, via an audio circuit (not shown). And a D / A converter 16 to be supplied to the speaker 19.

  The DVD recorder also has various operation keys such as a recording key for giving a recording instruction to the system controller 22, a reproducing key for giving a reproducing instruction, and a stopping key for giving a recording / reproducing stop instruction. And a main body operation unit (not shown) having fewer operation keys than the operation keys of the remote control 21.

  The DVD recorder also performs arithmetic processing in accordance with the flash ROM 23 storing programs and data for controlling each component of the apparatus and controlling the entire apparatus, and the programs and data in the flash ROM 23. A CPU 24 that controls the system controller 22, a RAM 27 that temporarily stores data necessary for arithmetic processing of the CPU 24, and an OSD that performs OSD processing when displaying the contents of data stored in the flash ROM 23 on the display device 20. Circuit 35.

  Further, this DVD recorder is connected to an antenna 28 and has a tuner 29 having functions of a digital tuner and an analog tuner, a TV broadcast video / audio signal selected by the tuner 29, a television receiver (not shown), and other video. An A / D conversion circuit 30 that converts the video / audio signal from the audio output device into digital video / audio data so that the video / audio signal can be encoded, an encoder 31 that encodes the video / audio data by MPEG, and the encoded video / audio data ( RAM 32 serving as a buffer memory for temporarily storing a predetermined amount of encoded data), ATAPI (AT Attachment Packet Interface) 33 which is an interface connected to the recording data modulation circuit 25, and the ATAPI 33. Encode data to optical disc And a recording data modulation circuit 25 that modulates the recording data to record data 1 and a laser modulation signal for modulating the laser light emitted from the optical pickup 2 based on the modulation data modulated by the recording data modulation circuit 25. 2 is provided.

  Furthermore, this DVD recorder is set to a subtitle color switching mode, which is a mode for changing the background color data included in the subtitle data read from the optical disc 1 and switching the background color of the subtitle displayed on the display device 20. A color data extracting means for extracting background color data and character color data relating to subtitles from the optical disc 1 during reproduction, and a subtitle contrast extracting means for extracting subtitle contrast based on the background color data and character color data. Transparency determining means for determining whether or not the background color data is within a predetermined transparency range based on the extracted subtitle contrast; and the background color data within a predetermined transparency range Color data changing means for changing the background color data when it is determined that the data is present; And a subtitle display processing unit 36 and a subtitle display means for displaying the subtitles on the display device 20 by the further color of characters indicating the background and the character color data of the color indicated by the background color data. Note that the caption display processing unit 36 may be provided as one of the functions of the system controller 22.

  FIG. 2 is a diagram showing a data structure recorded on a DVD of the DVD video standard as an optical disk in the present embodiment. In FIG. 2, the video object set (VOBS) includes a plurality of video objects (VOB), that is, (V0B_IDN1), (V0B_IDN2),..., (V0B_IDNi). IDN1, IDN2,..., IDNi indicate identification numbers. Each video object (VOB) is composed of a plurality of cells (Cells). For example, the video object (V0B_IDN1) includes a plurality of cells (C_IDN1), (C_IDN2), ..., (C_IDNj). IDN1, IDN2,..., IDNj indicate identification numbers.

  For example, the cell (C_IDN1) is composed of a plurality of video object units (VOBU). Each video object unit (VOBU) includes a navigation pack (NV_PCK), an audio pack (A_PCK), a video pack (V_PCK), and a sub-picture pack (SP_PCK).

  The sub-picture pack (SP_PCK) includes a sub-picture unit (SPU; Sub Picture Unit) (not shown), and the sub-picture unit has a background corresponding to background color data indicating the color of the background portion of the subtitle. A color code and a character color code corresponding to character color data indicating the color of the character portion of the caption are included. These color codes are the levels of Y signal (luminance signal), R signal (red video signal), G signal (green video signal), and B signal (blue video signal) that are the basis for displaying color video. Is shown. Therefore, in the contrast adjustment circuit (not shown) of the display device 20, the contrast is lowered when the amplitude of the Y signal is increased, and conversely, the contrast is increased when the amplitude of the Y signal is decreased. If the code indicating the level of is detected, the transparency of the background portion can be known.

  The navigation pack (NV_PCK) and the audio pack (A_PCK) are composed of, for example, 2048 bytes. For example, a 14-byte pack header, a 24-byte system header, and a 6-byte packet header ( Packet header), 1-byte sub-stream identifier (Sub_stream_id), 979-byte play control information data (PCI data), 6-byte packet header (Packet header), 1-byte sub-stream identifier (Sub_stream_id), and 1017-byte It consists of data search information data (DSI data).

  A play control packet (PCI_PKT) is composed of a 6-byte packet header (Packet header), a 1-byte substream identifier (Sub_stream_id), and 979-byte play control information data (PCI data). A 6-byte packet header (Packet header), a 1-byte substream identifier (Sub_stream_id), and 1017-byte data search information data (DSI data) constitute a data search information packet (DSI_PKT).

  Data search information data (DSI data) composed of 1017 bytes includes 32-byte data search information general information, 148-byte seamless playback information (SMI_PBI), 54-byte seamless angle information (SML_AGLI), and 168-byte video object. It consists of unit search information (VOBU_SRI), 144-byte synchronization information (SYNCI), and 471-byte reserved.

  The 168-byte video object unit search information (VOBU_SRI) is composed of 4-byte video forward information (FWDI Video), a 160-byte data area, and 4-byte video backward information (BWDI Video). . The video forward information (FWDI Video) indicates the start address of the next video object unit (VOBU) in the video stream (navigation pack start address). The video backward information (BWDI Video) indicates the start address of the previous video object unit (VOBU) in the video stream (start address of the navigation pack).

  FIG. 3 is a diagram showing an example of the contents of the color code table in the present embodiment. The color code table T is stored in advance in the flash ROM 23, and stores a character color code and a background color code indicating the relationship between the subtitle character color and the subtitle background color. In the color code table T, the character color black code corresponds to the background color white code, the character color white code corresponds to the background color black code, and the character color red code corresponds to the background color yellow code. ing. Note that the correspondence between the character color and the background color here is an example, and is not limited to this. In short, any correspondence relationship between the character color and the background color that makes it easy to recognize the subtitle character is acceptable.

  FIG. 4 is a diagram for explaining a processing procedure when the background color of the caption is changed in the present embodiment. In FIG. 4, reference numeral 41 denotes a screen before the subtitle background color is changed. The screen 41 displays a video 42 and subtitle characters (ABC) 43. Since the subtitle background 44 is transparent, the entire video 42 is displayed except for the character (ABC) portion. However, when the color of the character (ABC) is, for example, black and the color of the image 42 is also dark, the character (ABC) becomes difficult for the user to see.

  Therefore, since it is necessary to change the color of the subtitle background 44, the background color change processing is performed. That is, the transparent background 44 is changed to, for example, white. Reference numeral 45 denotes a background when the background color is changed to white. Therefore, as shown in the screen 46, since the color of the subtitle background 45 is, for example, white, a part of the video 42 is invisible, but the subtitle character (ABC) 43 is easily visible.

  FIG. 5 is a flowchart for explaining subtitle display processing in the present embodiment. The caption display processing will be described with reference to this flowchart and FIGS.

  After the optical disk (DVD) 1 is inserted into the DVD recorder and the optical disk 1 is started up, for example, the system controller 22 indicates that the playback key of the remote controller 21 has been pressed for the title selected by the operation of the remote controller 21. When detected (step S1), the system controller 22 starts playback on the optical disc 1 (step S2). When reproduction starts, the system controller 22 determines whether or not the subtitle color switching mode is set (step S3).

  That is, the user operates the remote controller 21 to display the setting menu screen on the display device 20, and the subtitle color switching mode is set by selecting and determining the setting item of the subtitle color switching mode. Therefore, the system controller 22 determines that the subtitle color switching mode is set (step S3), and when the subtitle color switching mode is set, the color data extracting means of the subtitle display processing unit 36 uses the sub-picture pack. When (SP_PCK) is read out (step S5), that is, when reproduction is performed on the optical disc 1, the sub picture decoder 13 outputs a sub picture unit (SPU). The sub picture unit (SPU) from the picture decoder 13 is analyzed to extract background color data and character color data related to the caption (step S6).

  Next, the subtitle contrast extraction unit of the subtitle display processing unit 36 extracts the subtitle contrast based on the background color data and the character color data (step S7). In other words, the subtitle contrast extraction means includes a code indicating the Y signal (luminance signal) level indicated by the background color data (background color code) and a code indicating the Y signal (luminance signal) level indicated by the character color data (character color code). The subtitle contrast is extracted based on the difference.

  Thereafter, the transparency determination means of the caption display processing unit 36 determines whether or not the background color data is data indicating that the background color data is within a predetermined transparency range based on the extracted caption contrast (step S8). ). The predetermined transparency range means that when the subtitle background is overlaid on the original video, the original video is completely transparent and can be seen as it is. This is a range up to and a predetermined transparency range. Therefore, the determination as to whether the background color data is within the predetermined transparency range is performed by determining whether the contrast included in the background color data is within the contrast range corresponding to the predetermined transparency range. It becomes possible.

  When it is determined that the background color data is data indicating that the background color data is within a predetermined transparency range, the color data changing means of the caption display processing unit 36 changes the background color data according to the color code table T (step S9). For example, if the background color data related to the caption recorded on the optical disc 1 is data indicating a transparent color and the character color data is data indicating black, it is difficult to see the characters of the caption in the original video. If the background color is white, it will be easier to see. For this reason, the color data changing means refers to the color code table T, reads the white code of the background color code corresponding to the black code of the character color code from the color code table T, and indicates the background color data as white. Change to background color data.

  Then, the subtitle display means of the subtitle display processing unit 36 causes the display device 20 to display subtitles by using the color background indicated by the changed background color data and the characters indicated by the character color data (step S10). ). That is, when the subtitle display means is set to the subtitle color switching mode, the subtitle data from the sub-picture decoder 13 is not superimposed on the video data from the video decoder 15 and is changed from the subtitle display processing unit 36. The video processor 17 is controlled to superimpose the subtitle data thus superimposed on the video data from the video decoder 15.

  Therefore, when the subtitle color switching mode is set, the video processor 17 superimposes the changed subtitle data from the subtitle display processing B36 on the video data from the video processor 15, that is, the subtitle data and the video data are superposed. The synthesized data is input to the video encoder 18. As a result, the video encoder 18 converts the input composite data into a display video signal and causes the display device 20 to display a video with captions. In this case, since the background color of the subtitle has been changed, for example, as shown in the screen 46 in FIG. 4, the subtitle background 45 has been changed from a transparent color to white. (ABC) becomes easy to see.

  On the other hand, when it is determined in step S3 that the subtitle color switching mode has not been set, that is, when the subtitle color switching mode has not been set in advance by a user operation, the sub-picture pack (SP_PVK) is When read (step S4), the caption is displayed on the display device 20 (step S10). That is, the subtitle display means of the subtitle display processing unit 36 sets the video processor 17 to superimpose the subtitle data from the sub-picture decoder 13 on the video data from the video decoder 15 when the subtitle color switching mode is not set. Control.

  Therefore, when the subtitle color switching mode is not set, the video processor 17 superimposes the subtitle data from the sub-picture decoder 13 on the video data from the video processor 15, that is, combines the subtitle data and the video data. The synthesized data is input to the video encoder 18. As a result, the video encoder 18 converts the input composite data into a display video signal and causes the display device 20 to display a video with captions. In this case, since the background color of the caption is the color indicated by the background color data (background color code) recorded in advance on the optical disc 1, for example, the caption background 44 is transparent as shown in the screen 41 of FIG. It becomes a color and it is difficult for the user to see the subtitle characters (ABC).

  After the subtitle with the background color changed or the subtitle without changing the background color is displayed, the subtitle display processing unit 36, during playback, displays the sub picture unit (SPU) in one sub picture pack (SP_PVK). The subtitles based on the subtitle data read from are displayed on the display device 20 for a predetermined time (step S10). Then, the process from step S3 to step S10 is repeated until the reproduction for the title is completed (step S11). When the reproduction for the title is completed, the caption display process is terminated.

  As described above, according to the present embodiment, when the subtitle color switching mode is set, when the background color data related to the subtitle read from the optical disc at the time of reproduction is within a predetermined transparency range, the subtitle character In order to change the background color so that it is easy to see, the background color data is changed so that the background of the subtitle is displayed on the display device, so that the subtitle can be displayed regardless of the color of the original video reproduced from the optical disc. Can be easily seen, and the stress of reading subtitle characters can be reduced when the user views a movie or the like.

  INDUSTRIAL APPLICABILITY The present invention can be used for a caption display function of an optical disc apparatus such as a DVD recorder or a DVD player, and can be displayed by changing the background color of the caption.

It is a block diagram which shows the structure of the DVD recorder as an optical disk apparatus based on one Embodiment of this invention. It is a figure which shows the structure of the data currently recorded on DVD of the DVD video specification as an optical disk in the said embodiment. It is a figure which shows an example of the content of the color code table in the said embodiment. It is a figure for demonstrating the procedure of a process in case the background color of a subtitle is changed in the said embodiment. It is a flowchart for demonstrating a caption display process in the said embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical disk 20 Display apparatus 36 Subtitle display processing part (Color data extraction means, Subtitle contrast extraction means, Transparency determination means, Color data change means, Subtitle display means)
T color code table

Claims (3)

In an optical disc apparatus for reproducing or recording / reproducing information on an optical disc,
When the background color data included in the subtitle data read from the optical disc is changed and the subtitle color switching mode, which is a mode for switching the background color of the subtitle displayed on the display device, is set,
Color data extraction means for extracting background color data and character color data relating to subtitles from the optical disc during reproduction;
Subtitle contrast extraction means for extracting subtitle contrast based on the background color data and the character color data;
Transparency determining means for determining whether or not the background color data is within a predetermined transparency range based on the extracted subtitle contrast;
Color data changing means for changing the background color data when it is determined that the background color data is data indicating that the background color data is within a predetermined transparency range;
A subtitle display processing unit having a subtitle display means for displaying a subtitle on a display device by using the background of the color indicated by the changed background color data and the character of the color indicated by the character color data is provided. Optical disk device.   When the background color data is changed by the color data changing means, a character color code and a background color code indicating the relationship between the subtitle character color and the subtitle background color are stored in advance so that the character can be easily seen with respect to the subtitle background. 2. The optical disk apparatus according to claim 1, wherein the optical disk apparatus is performed with reference to the color code table.   2. The optical disc apparatus according to claim 1, wherein whether or not the background color data is within a predetermined transparency range is determined by whether or not the subtitle contrast is lower than a predetermined value.

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