WO2007034886A1

WO2007034886A1 - Image reproducing device and image reproducing method

Info

Publication number: WO2007034886A1
Application number: PCT/JP2006/318766
Authority: WO
Inventors: Masayuki Hasegawa
Original assignee: Matsushita Electric Industrial Co., Ltd.
Priority date: 2005-09-22
Filing date: 2006-09-21
Publication date: 2007-03-29
Also published as: JP2007088933A

Abstract

An image reproducing device which displays an image on a built-in display device, and at the same time, displays a beautiful image on a commercially available external display device connected to the image reproducing device. In the device, an image quality adjusting section (108) for internal performs image adjusting process for the built-in display device (102) to an image data inputted from a data input section (105), and displays the image on the built-in display device (102). When a connection detecting section (110) detects that the external image display device (301) is connected to the external connecting section (103), the image quality adjusting section (109) for external performs image quality adjusting process by following an external connection information table (113), and outputs an image signal to the external display device (301) through the external connecting section (103).

Description

Specification

Video playback apparatus and video playback method

Technical field

The present invention relates to a portable video playback apparatus and video playback method for displaying a video on a built-in video display device and simultaneously outputting a high-quality video to a commercially available video display device connected thereto.

Background art

[0002] Conventionally, the resolution of a mobile phone is QCIF (176 x 144 pixels) or QVGA (320

When video data is output from a small video playback device such as a mobile phone to a commercially available video display device with a VGA (640 x 480 pixels) resolution, it is played back for a mobile phone. The video data was enlarged and displayed. However, in recent years, commercially available video display devices have also become larger and high-definition high-definition televisions such as HDTV (High Definition TV) with a high resolution of 1920 x 1080 pixels have been distributed, and the aspect ratio of the display screen has been increased from 4: 3. 16: 9 also appears, and image quality degradation due to enlargement tends to increase. For this reason, there is an image playback device that executes image quality processing that is optimal for a video display device used as an external display device (see, for example, Patent Document 1 and Patent Document 2).

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[0003] The image reproduction apparatus of Patent Document 1 includes additional data in which shooting conditions of input image data are recorded, an output device selection means for selecting an output device based on the additional data, and a corresponding output device. Profile recording means for recording an image correction profile for correcting image characteristics of image data, profile selection means for selecting an image correction profile according to the output device, and image processing based on the image correction profile. Output control means for controlling to output to the output device, and automatically selects several image correction profiles and optimal output media that are pre-saved according to the additional data recorded for each image data. Select and play back the optimal corrected video.

[0004] The image reproduction device of Patent Document 2 includes a connector for connecting a detachable external display device; The transmission means for transmitting information to the detachable external display device attached to the connector, the detection means for detecting the characteristics of the detachable external display device, and the functions and characteristics of the detachable external display device detected by the detection means. And a control means for controlling the operation of the electronic device system accordingly. In the playback mode, the detachable external display device reads out the image data stored in the memory card of the image playback device main body, and stores the image data. It is converted into display image data according to the characteristics of the display screen on the detachable external display device (number of pixels, differences in display elements, etc.) and displayed on the display screen on the detachable external display device side.

Patent Document 1: Japanese Patent Laid-Open No. 2004-250109 (paragraphs [0061]-[0069], FIG. 2) Patent Document 2: Japanese Patent Laid-Open No. 2004-88396 (paragraph [0033], FIG. 16, FIG. 17)

Disclosure of the invention

Problems to be solved by the invention

[0005] However, the image reproduction apparatus of Patent Document 1 selects an output device from the additional data store that stores the shooting conditions of a digital camera or the like, applies an appropriate correction according to the output device, and performs a preview. Since it cannot be corrected if the shooting conditions are not recorded, it cannot be applied to general images.

[0006] The image reproduction device of Patent Document 2 reads image data stored in the memory card of the image reproduction device main body on the detachable external display device side, and responds to the characteristics of the display screen on the detachable external display device side. It can be realized that there is no strict bidirectional control, such as sequential and special data communication control is required between the image playback device main body and the removable external display device. It is an electronic device system, which is detachable, but cannot display a video by connecting a commercially available video display device.

[0007] In addition, since the usage of the external display device has been various, the external display device is not always installed in a place where the user can operate the video playback device, and is therefore displayed on the external display device. There is a demand for confirming the video to be recorded on the video playback device. There is only one image correction means that can be executed at the same time, and only one video display device is available.

[0008] In the video playback device, contour enhancement processing is performed to sharpen the video. In particular, in a small video playback device such as a mobile phone, it is easy to distinguish small parts in a small display screen. As described above, stronger edge enhancement processing is performed. For that reason If the video reproduced for a small video playback device such as a mobile phone is output to the external display device as it is, after the strong contour enhancement processing for the small video playback device is performed, the video is further enlarged to enhance the contour enhancement. Therefore, there is a problem that the noise is further emphasized by the edge enhancement that is performed only by the deterioration of the image quality due to the enlargement, and the image looks bad.

An object of the present invention is to provide a video playback apparatus and a video playback method capable of displaying a video on a built-in display device and simultaneously displaying a beautiful image on a connected external display device. is there.

Means for solving the problem

[0010] In the video reproduction apparatus of the present invention, an input means for inputting video data, an internal image quality adjustment means for performing an image quality adjustment process on the video data, and the internal image quality adjustment means perform the image quality adjustment process. Internal display means for displaying the performed video data; an external connection interface for connecting an external video display device; a connection detection means for electrically detecting that an external video display device is connected to the external connection interface; External image quality adjustment means for performing image quality adjustment processing on video data input by the input means according to the external connection interface detected by the connection detection means; and the external image quality adjustment means performs image quality adjustment processing. Output means for outputting the received video data to the external video display device connected by the external connection interface.

[0011] The video playback method of the present invention includes an internal display step of performing internal image quality adjustment processing on input video data and displaying the video data on the internal display means, and the connection detecting means on the external connection interface. An external device that detects that a display device is connected, performs external image quality adjustment processing on the video data according to the external connection interface, and outputs the image data to the external video display device connected by the external connection interface. The part output step is executed simultaneously in parallel.

The invention's effect

[0012] According to the present invention, it is possible to display a beautiful image on a connected external display device at the same time as displaying an image on a built-in display device.

Brief Description of Drawings

[0013] [FIG. 1A] A mobile phone before connecting a commercially available external display device according to Embodiment 1 of the present invention. External view of the machine

[Fig. IB] External view of mobile phone connected to a commercially available external display device according to Embodiment 1 of the present invention

FIG. 2 is a block diagram showing the configuration of the mobile phone according to Embodiment 1 of the present invention.

FIG. 3 shows an example of an external connection information table according to Embodiment 1 of the present invention.

FIG. 4 is a flowchart for explaining the operation of the mobile phone according to Embodiment 1 of the present invention.

FIG. 5A is an external view of a mobile phone before an external display device according to Embodiment 2 of the present invention is connected.

FIG. 5B is an external view of a mobile phone in a state where the external display device according to Embodiment 2 of the present invention is connected.

FIG. 6 is a block diagram showing a configuration of a mobile phone according to Embodiment 2 of the present invention.

FIG. 7 shows an example of an external connection information table according to Embodiment 2 of the present invention.

FIG. 8 is a flowchart for explaining the operation of the mobile phone according to the second embodiment of the present invention.

FIG. 9 is a flowchart for explaining the operation of external image quality adjustment processing according to the second embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, Embodiment 1 and Embodiment 2 of the present invention will be described in detail with reference to the drawings, taking a mobile phone as an example of a video playback device. Embodiment 1 is an example of a mobile phone in which a single external display device is connected to the mobile phone and an image is simultaneously displayed on the single external display device and the built-in display device of the mobile phone. This is an example of a mobile phone in which a plurality of external display devices are connected to a mobile phone and images are simultaneously displayed on the plurality of external display devices and the mobile phone's built-in display device.

[0015] (Embodiment 1)

FIG. 1A is an external view of a mobile phone before a commercially available external display device is connected, and FIG. 1B is an external view of the mobile phone with a commercially available external display device connected thereto. As shown in FIGS. 1A and 1B, the mobile phone 101 includes a built-in display device 102 for displaying reproduced video, peripheral devices such as commercially available TVs, HDTVs, recorders, personal computer displays, and DVI-compliant monitors. And an external connection unit 103 for connecting an external display device 301 such as a cable 302 or a communication adapter capable of wireless communication. [0016] The external connection unit 103 is provided with one insertion port 104 for electrically connecting the mobile phone 101 and a commercially available external display device 301, and the video terminal on one side of the cable 302 is connected to the external display device. If the connection terminal on the opposite side connected to 301 or a commercially available external display device 301 has a wireless communication function, a wireless communication adapter for performing wireless communication is inserted into the insertion port 104 and the mobile phone 101 is externally connected. The display device 301 is connected.

[0017] A cable 302 on the side connected to the external display device 301 outputs a composite video terminal that outputs a video signal as an analog signal, a separate video terminal, a component video terminal, a D terminal, and a video signal as a digital signal. DVI terminal etc. are provided

[0018] Information on the external display device 301 that can be connected to the mobile phone 101 is registered in advance, but the user registers information on the resolution of the external display device 301 to be connected and the video terminal to be connected to the external display device 301. Or you may enable it to change.

FIG. 2 is a block diagram showing a configuration of the mobile phone according to Embodiment 1 of the present invention.

As shown in FIG. 2, the mobile phone 101 is connected to a data input unit 105, a demultiplexer 106 connected to the data input unit 105, a video decoder 107 connected to the demultiplexer 106, and a video decoder 107. The internal image quality adjustment unit 108, the internal display device 102 that displays the video signal reproduced by the internal image quality adjustment unit 108, the external image quality adjustment unit 109 that is also connected to the video decoder 107, and the external image quality adjustment Unit 109 and external display device 301 are connected, and external connection unit 103 is connected, and connection detection unit 110 that electrically detects that external display device 301 is connected to insertion port 104 of external connection unit 103. .

[0020] The data input unit 105 reads and inputs a multiplexed stream including video data from a file stored in a memory or the like. The file may store image data captured by the mobile phone 101 and recorded video data, or may store video data downloaded via the network using the mobile phone 101.

[0021] The demultiplexer 106 separates the video stream from the multiplexed stream. The video decoder 107 decodes the video stream separated by the demultiplexer 106 into a video signal according to the compression codec. [0022] The internal image quality adjustment unit 108 sets the resolution of a file input in accordance with a small liquid crystal screen such as the built-in display device 102 of the mobile phone 101 to QCIF (176 X 144 pixels) or QVGA (320 X 240). A resolution adjustment unit 111 that performs processing for conversion to pixels), and an image filter unit 112 that performs strong and contour enhancement processing in accordance with the low-resolution conversion performed by the resolution adjustment unit 111. The converted video signal is converted to match the built-in display device 102 and the post-filtered video signal is displayed on the built-in display device 102.

[0023] The external image quality adjustment unit 109 includes an external connection information table 113 in which the resolution of the external display device 301 that can be connected to the mobile phone 101 and the output format of the video terminal of the cable 302 or the output format of the wireless communication adapter are registered. The resolution conversion processing is performed by calculating the enlargement ratio of the decoded video signal according to the resolution of the input file and the resolution of the external display device 301 registered in the external connection information table 113 and performing the enlargement or reduction processing. When high-resolution conversion is performed by the resolution adjustment unit 114 and the resolution adjustment unit 114, outline enhancement processing optimal for high-resolution resolution conversion is performed, and the low-resolution conversion is performed by the resolution adjustment unit 114. In some cases, the video filter unit 115 performs edge enhancement processing that is optimal for low-resolution conversion, and the video signal is converted to a general-purpose interface according to the output format of the video terminal registered in the external connection information table 113. And a interface adjuster 116 outputs to the external display device 301 is converted into over scan signal. Generally, it is desirable to perform weak edge enhancement processing when high resolution conversion is performed by the resolution adjustment unit 114, and to perform strong edge enhancement processing when low resolution conversion is performed by the resolution adjustment unit 114. U ,.

[0024] The connection terminal of the cable connecting the external display device 301 is inserted into the insertion port 104 of the external connection unit 103, and the connection detection unit 110 detects that the external display device 301 is electrically connected. Then, the external image quality adjustment unit 109 adjusts the image quality according to the external connection information table 113 and transmits the video signal from the interface adjustment unit 116 to the external display device 301 via the external connection unit 103.

[0025] The resolution adjustment unit 114 has an aspect ratio of 4: 3 when outputting to a TV. Therefore, the VGA series video is enlarged while maintaining the aspect ratio, and the CIF series video is displayed. When outputting to TV or VGA'CIF series video to HDTV, the aspect ratio is different. Therefore, the top and bottom cropping or blow-up processing is used to cut the top and bottom of the played video and display it on the external display device 301. In the case of the center arrangement, the video played back with the left and right sides painted. The enlargement process is performed by any method of displaying the entire area on the external display device 301 without fixing the aspect ratio by the force for displaying the image on the external display device 301, full-size conversion, or anamorphic that stretches left and right. The enlargement method may be set by the user or automatically selected.

[0026] Also, in the case of TV, 10% to 20% of the image displayed by the video signal may not be displayed depending on the concept of the safety area, so the enlargement ratio of the resolution adjustment unit 114 is combined with the image. Decide that the characters are not too close to the corners, and that the information displayed at the edge of the image is not interrupted, and that there is no problem even if it is interrupted.

The video filter unit 115 selects an optimum one from the preset contour emphasis value according to the enlargement ratio of the resolution adjustment unit 114, and performs the contour emphasis process.

FIG. 3 is a diagram showing an example of the external connection information table according to Embodiment 1 of the present invention. As shown in FIG. 3, the external connection information table 113 includes, for example, the resolution 121 of the external display device and the output format 122 of the video terminal representing the output format of the video terminal of the cable 302 or the output format of the wireless communication adapter. It is configured, and the resolution of the external display device 121 and the output format 122 of the video terminal are registered in advance, but the user should register or change them.

[0029] As shown in FIG. 3, for example, the conversion process for component output by the component video terminal is registered in the output format 122 of VGA (640 X 480 pixels) TV in the resolution 121 of the external display device and the output format of the video terminal. In other words, the resolution adjustment unit 114 performs VGA (640 x 480 pixels) resolution conversion processing! The video filter unit 115 performs weak edge enhancement processing according to the high resolution, and the interface adjustment unit 116 The video signal is converted to analog luminance (Y) · color difference signals (Cb, Cr) according to the component video terminals and output.

The operation of the mobile phone 101 configured as described above will be described. FIG. 4 is a flowchart for explaining the operation of the mobile phone according to Embodiment 1 of the present invention. As shown in Figure 4 When the user selects a file from the memory (ST101) and inputs “playback” (ST10 2; YES), until “end of playback” is input (ST103; NO), the data input unit 105 The multiplexed stream of the selected file is input (ST104), the demultiplexer 106 separates the video stream from the input multiplexed stream (ST105), and the video decoder 107 decodes the video stream into a video signal. (ST106).

[0031] If the connection detection unit 110 has not detected an external connection (ST107; NO), the resolution adjustment unit 111 of the internal image quality adjustment unit 108 decodes the video signal in accordance with the built-in display device 102. QCIF (176 x 144 pixels) or QVGA (320 x 240 pixels) resolution conversion processing (ST108), and the video filter unit 112 is capable of enhancing high-concentration contours that are optimal for low resolutions and low resolutions. Perform processing (outline enhancement processing optimal for reduction ratio) (ST109), output video to the built-in display device 102 (ST110), return to ST103, and until “end of playback” is input (ST103; NO ), Repeat the process from ST104 to ST110.

[0032] In ST107, if the connection detection unit 110 detects an external connection (ST107; YES), the video decoded by the video decoder 107 in the external image quality adjustment unit 109 in parallel with the processing of ST108 to ST110 The following processing is performed on the signal.

The resolution adjustment unit 114 performs VGA (640 × 480 pixel) resolution conversion processing according to the resolution 121 of the external display device registered in the external connection information table 113 shown in FIG. 3 (ST111), and the video filter unit 115 performs contour enhancement processing that is optimal for high resolution in accordance with high resolution (ST112), and the interface adjustment unit 116 performs conversion for component output registered in the video terminal output format 122 of the external connection information table 113. In accordance with the process, the video signal is converted into a general-purpose interface signal of analog luminance (Y) 'color difference signals (Cb, Cr) (ST113) and output to the external display device 301 (ST114). Returning to 103, the processing from ST104 to ST114 is repeated until “end of reproduction” is input (ST103; NO). Generally, it is desirable that the video filter unit 115 performs weak contour enhancement processing in accordance with high resolution.

Thus, according to Embodiment 1 of the present invention, the internal image quality adjustment unit 108 that performs image quality adjustment for the built-in display device 102, and the external connection unit 103 that connects the external video display device 301 are provided. , A connection that detects that the external video display device 301 is connected to the external connection unit 103. Since it has a connection detection unit 110 and an external image quality adjustment unit 109 that adjusts the image quality according to the external connection information table 1 13 when the connection detection unit 110 detects an external connection, the image is displayed on the built-in display device 102 at the same time. A beautiful image could be displayed on the connected external display 301.

[0035] Since it was possible to simultaneously display images on the built-in display device 102 of the mobile phone 101 and the external display device 301, a large conference room equipped with a plurality of external display devices 301 as monitors, a conference, etc. Now, even if the user is away from the external display device 301, the mobile phone 101 can start and stop playback while checking the video displayed on the external display device 301. The convenience of the device could be improved. In addition, mini-broadcasting can be performed to multiple viewers at remote locations while checking the displayed video.

[0036] In addition, the video filter unit 112 of the internal image quality adjustment unit 108 that performs optimum edge enhancement processing for a small display screen, and the resolution adjustment unit 114 in accordance with the resolution of the external display device 301, High when resolution conversion is performed, optimal edge enhancement processing for resolution conversion is performed.Low when resolution conversion is performed by the resolution adjustment unit 114! Since the image filter unit 115 of the image quality adjustment unit 109 is provided separately, it is possible to simultaneously provide high-quality images that are optimal for the built-in display device 102 and the external display device 301, respectively.

[0037] Since the image filter unit 115 performs optimum contour emphasis as the enlargement factor increases, the image quality deterioration due to noise is not noticeable in the external display device 301 having a large enlargement factor.

[0038] Since the resolution conversion is performed by the resolution adjustment unit 114 and the image is also subjected to the edge enhancement processing by the video filter unit 115 !, image quality degradation due to noise can be minimized.

Note that image data input by the camera function of the mobile phone 101 can also be input as input video data. If the input video data is not multiplexed, the demultiplexer 106 is omitted, and if the input video data is not decoded, the video decoder 107 is omitted.

Note that the resolution adjustment unit 111 and the resolution adjustment unit 114 are the resolution of the built-in display device 102 of the mobile phone 101, the resolution of the external display device 301, and the resolution of the input file. Depending on the degree, the reduction or the same size (no conversion) processing may be performed just by the enlargement processing.

[0041] (Embodiment 2)

FIG. 5A is an external view of the mobile phone before the external display device is connected, and FIG. 5B is an external view of the mobile phone with the external display device connected thereto. 5A and 5B, the same parts as those of mobile phone 101 according to Embodiment 1 shown in FIGS. 1A and 1B are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIGS. 5A and 5B, the mobile phone 201 according to Embodiment 2 includes, for example, “a”, “b”, “c”, “d”, “e” in the external connection unit 203. ”Or the like, a plurality of insertion openings 204 are provided, and a plurality of commercially available external display devices 301 can be connected simultaneously.

[0043] “a” may be a composite video terminal, “b” a separate video terminal, “c” a component video terminal, “d” a D terminal, “e” a DVI terminal, etc. , “A”, “b”, “c”, “d”, and “e” may be all component ports 204 as component video terminals.

FIG. 6 is a block diagram showing a configuration of the mobile phone according to Embodiment 2 of the present invention.

In FIG. 6, the same components as those of mobile phone 101 according to Embodiment 1 shown in FIG. As shown in FIG. 6, the cellular phone 201 according to the second embodiment is different from the connection of the external display device 301 by the connection detection unit 210 in that the external connection unit 203 is provided with a plurality of insertion ports 204. Detecting the slot 204, for example, “a”, “b”, “c”, “d”, “e”, and the external image quality adjustment unit 209, the slot 204, for example, “a”, The external connection information table 213 corresponding to “b”, “c”, “d”, and “e” is provided, and the connection 204 detects the connection, for example, “a”, “b”. , “C”, “d”, and “e”, each of which includes a resolution adjustment unit 114, a video filter unit 115, and an interface adjustment unit 116, and executes a plurality of different image quality adjustment processes simultaneously.

FIG. 7 shows an example of the external connection information table according to Embodiment 2 of the present invention. As shown in FIG. 7, for example, the external connection information table 213 is composed of an insertion port 221, a resolution 222 of an external display device, an output format 223 of a video terminal, and the like. ”,“ B ”,“ c ”,“ d ”,“ e ”, the power outlet 221 in which the resolution 222 of the external display device and the output format 223 of the video terminal are registered in advance, for example,“ a ” , “B”, “c”, “d”, “e” corresponding to the resolution 222 of the external display device to be connected and the output format of the video terminal 223 Let the user register or change.

As shown in FIG. 7, if HDTV (1920 × 1080 pixels) is registered in the resolution 222 of the external display device, for example, “c” and “d” of the insertion port 221 The resolution adjustment unit 114 performs HDTV (1920 × 1080 pixel) resolution conversion processing, and the video filter unit 115 performs optimum edge emphasis processing according to high and resolution.

[0047] If a PC monitor (1600 x 1200 pixels) is registered in the resolution 222 of the external display device as indicated by “e” in the outlet 221, the resolution adjustment unit 114 uses a PC monitor (1600 x 1200 pixels). ) Resolution conversion processing, and the image filter unit 115 performs optimum edge enhancement processing in accordance with the high resolution.

[0048] When the composite output conversion process using the composite video terminal is registered in the output format 222 of the video terminal as indicated by “a” in the insertion port 221, the interface adjustment unit 116 displays the composite video terminal. The video signal is converted into a YZC composite analog luminance signal (Y) and color signal (C) for output.

[0049] When the conversion process for separate output by the separate video terminal is registered in the output format 222 of the video terminal as shown in “b” of the insertion port 221, the interface adjustment unit 116 is connected to the separate video terminal. At the same time, the video signal is converted into YZC-separated analog luminance signal (Y) and color signal (C) and output.

[0050] When the conversion process for D terminal output by the D terminal video terminal is registered in the output format 222 of the video terminal as indicated by “d” in the insertion port 221, the interface adjustment unit 116 displays the D video. Video signals are converted to analog luminance (Y) and color difference signals (Cb, Cr) according to the terminal and output.

[0051] When the DVI conversion process in the digital output format DVI (Digital Video Interface) is registered in the output format 222 of the video terminal as indicated by “e” in the insertion port 221, the interface adjustment unit 116 Video signals are digitally converted and output according to the DVI standard. In the DVI standard, in the case of force digital transmission in which image data and control signals are digitally transmitted and output, control is required between the external display device 301 and the external display device 301 conforms to the standard. It is limited to.

[0052] The operation of the mobile phone 201 configured as described above will be described. FIG. 8 shows the present invention. FIG. 10 is a flowchart for explaining the operation of the mobile phone according to the second embodiment. In FIG. 8, the same steps as those in the flowchart for explaining the operation of mobile phone 101 according to Embodiment 1 shown in FIG. As shown in FIG. 8, if the connection detection unit 210 detects an external connection! / NO (ST201; NO), the processing of ST108 to ST110 is performed.

In ST201, if connection detection section 210 detects an external connection (ST201; YES), external image quality adjustment section 209 performs external image quality adjustment processing in parallel with the processing of ST108 to ST110 (ST202). .

FIG. 9 is a flowchart for explaining the operation of the external image quality adjustment processing according to Embodiment 2 of the present invention. As shown in FIG. 9, when the connection of the external display device 301 is detected at one insertion port 204 (ST301; YES), the resolution adjustment unit 114 inserts the connection detected in the external connection information table 213. Resolution conversion processing is performed according to the resolution 222 of the external display device registered in the port 221 (ST111), and the video filter unit 115 is optimal for high resolution conversion when the resolution adjustment unit 114 performs high resolution conversion. Contour enhancement processing is performed, and when the low resolution conversion is performed by the resolution adjustment unit 114, low! The optimum contour emphasis processing for resolution conversion is performed (ST112), and the interface adjustment unit 116 reads the external connection information table. The video signal is converted into a general-purpose interface signal in accordance with the output format 223 of the video terminal registered in 213 (ST113), output to the external display device 301 (ST114), and the process returns to ST103. In general, it is desirable to perform weak edge enhancement processing when high resolution conversion is performed by the resolution adjustment unit 114, and to perform strong edge enhancement processing when low resolution conversion is performed by the resolution adjustment unit 114.ヽ.

When the connection of the external display device 301 is detected at the two insertion ports 204 (ST302; YES), the same processing of ST111 to ST114 is similarly performed in parallel with the processing of ST11 to ST114.

[0056] When connection of the external display device 301 is detected at the three insertion ports 204 (ST303; YES), another ST111 to ST114 process is performed in parallel with the two ST111 to ST114 processes. .

[0057] In the external image quality adjustment process, when the connection of the external display device 301 is detected by a plurality of insertion ports 204, the number of the insertion ports 204 in which the connection of the external display device 301 is detected is determined. According to ST11 Processes 1 to ST114 are executed in parallel, and video is simultaneously output to a plurality of connected external display devices 301.

Thus, according to Embodiment 2 of the present invention, since a plurality of insertion ports 204 and connection detection unit 210 are provided in external connection unit 203, a plurality of commercially available external display devices are provided in mobile phone 201. 30

You can connect 1 and display beautiful images at the same time.

Note that the cellular phone 201 may be connected to a plurality of external display devices 301 by a communication means such as a power network that is directly connected by wired or wireless communication such as the cable 302.

[0060] Based on Japanese Patent Application 2005-276534 filed on September 22, 2005. This content [all included here.

Industrial applicability

[0061] The video playback apparatus according to the present invention has the effect of displaying a video on a built-in display device and simultaneously displaying a beautiful image on a commercially available external display device connected to the mobile phone or portable player. This is effective for small and portable video playback devices and video playback methods.

Claims

The scope of the claims

[1] An input means for inputting video data;

Internal image quality adjusting means for performing image quality adjustment processing on the video data; internal display means for displaying video data on which the internal image quality adjusting means has performed image quality adjustment processing;

An external connection interface for connecting an external video display device;

Connection detecting means for electrically detecting that an external video display device is connected to the external connection interface;

An external image quality adjustment means for performing image quality adjustment processing on video data input by the input means according to the external connection interface detected by the connection detection means;

An image reproduction apparatus comprising: output means for outputting the image data subjected to image quality adjustment processing by the external image quality adjustment means to the external image display device connected by the external connection interface.

[2] The external image quality adjustment means includes an external connection information registration table for registering a resolution of an external video display device connected by the external connection interface and a format for outputting a video signal to the external video display device. 1. The video playback device according to 1.

[3] The external image quality adjusting means performs an interface enhancement process for adjusting a format for outputting a video signal by performing an edge enhancement process after performing a resolution conversion process on the video data input by the input means. The video reproduction device according to claim 2, further comprising image quality adjusting means for performing the operation.

[4] When the connection detection unit detects that a plurality of the external video display devices are connected to the external connection interface, the external image quality adjustment unit uses the image quality adjustment unit according to the external connection interface. The video reproduction device according to claim 3, comprising a plurality.

[5] In the edge enhancement process, when an extension process with a large enlargement ratio is performed in the resolution conversion process, an edge enhancement process optimal for the enlargement ratio is executed, and the resolution conversion process is performed. In the case of expansion processing or reduction processing with a small enlargement ratio, 4. The video reproduction apparatus according to claim 3, wherein contour enhancement processing optimal for the reduction ratio is performed.

6. The video reproduction device according to claim 3, wherein the interface adjustment processing adjusts a format of outputting the video signal in accordance with a format of outputting the video signal to the external video display device registered in the external connection information registration table. .

7. The video reproduction device according to claim 5, wherein the enlargement ratio is calculated according to the resolution of the video data input by the input means and the resolution of the external video display device registered in the external connection information registration table. .

[8] An internal display step for performing internal image quality adjustment processing on the input video data and displaying it on the internal display means;

The connection detecting means detects that an external video display device is connected to the external connection interface, performs external image quality adjustment processing on the video data according to the external connection interface, and is connected by the external connection interface. A video playback method in which an external output step for outputting to an external video display device is simultaneously executed in parallel.

[9] The external image quality adjustment process is performed by an image quality adjustment process in which an edge adjustment process is performed after a resolution conversion process is performed on the video data, and an interface adjustment process is performed to adjust the format for outputting the video signal. The video playback method according to claim 8.

[10] When the connection detecting unit detects that a plurality of the external video display devices are connected to the external connection interface, the external image quality adjustment processing is performed according to the external connection interface. The video playback method according to claim 9, wherein a plurality of processes are executed simultaneously.