WO2005094069A1 - 画像処理装置および画像処理方法 - Google Patents
画像処理装置および画像処理方法 Download PDFInfo
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- WO2005094069A1 WO2005094069A1 PCT/JP2005/005160 JP2005005160W WO2005094069A1 WO 2005094069 A1 WO2005094069 A1 WO 2005094069A1 JP 2005005160 W JP2005005160 W JP 2005005160W WO 2005094069 A1 WO2005094069 A1 WO 2005094069A1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/445—Receiver circuitry for the reception of television signals according to analogue transmission standards for displaying additional information
- H04N5/45—Picture in picture, e.g. displaying simultaneously another television channel in a region of the screen
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
- H04N21/4307—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen
- H04N21/43072—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen of multiple content streams on the same device
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
- H04N21/4305—Synchronising client clock from received content stream, e.g. locking decoder clock with encoder clock, extraction of the PCR packets
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/431—Generation of visual interfaces for content selection or interaction; Content or additional data rendering
- H04N21/4312—Generation of visual interfaces for content selection or interaction; Content or additional data rendering involving specific graphical features, e.g. screen layout, special fonts or colors, blinking icons, highlights or animations
- H04N21/4316—Generation of visual interfaces for content selection or interaction; Content or additional data rendering involving specific graphical features, e.g. screen layout, special fonts or colors, blinking icons, highlights or animations for displaying supplemental content in a region of the screen, e.g. an advertisement in a separate window
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/04—Synchronising
Definitions
- the present invention relates to image display, and more particularly to an image processing device and an image processing method for displaying an image based on two image signals on a display device in two screens.
- a technique relating to a two-screen display processing device for generating a display screen is disclosed. That is, the conventional two-screen display processing device converts the two-screen display video signal from the first and second video signals based on the clock synchronized with the first video signal and the synchronization signal of the first video signal. Is generated.
- a graphic image signal such as a car navigation system is input as a first video signal (main image signal), and a second video signal (sub image signal) is input.
- the clock is a clock synchronized with the main image signal
- the display synchronization signal is a control signal generated from a synchronization signal (here, a vertical synchronization signal) of the main image signal
- the main synchronization signal is a main image signal.
- the main screen is the screen image when the main image signal is displayed
- the sub-sync signal is the synchronization signal for the sub-image signal
- the sub-screen displays the sub-image signal in the frame memory.
- the display screen is a two-screen display screen, that is, a screen image when a main screen and a sub-screen are simultaneously displayed (a superimposed video signal obtained by combining a main image signal and a sub-image signal is displayed). It is.
- the main synchronization signal is used as the display synchronization signal.
- the length of one frame of an image signal of a car navigation system and an image signal of a television, a video, a DVD or the like do not always match. For example, there may be a slight deviation due to variations in parts in the equipment. The deviation may be large due to differences in the input video signal system such as the NTSC (National Television Standards Committee) system or the PAL (Phase Alternating Line) system. For this reason, in FIG. 1, the display time of the main screen and the display time of the sub-screen are different.
- a main image signal is input in the order of main screens ml, m2, ..., ml8, and a sub image signal is input in the order of sub-screens sl, s2, ..., sl5.
- the sub image signal is written to the frame memory.
- a main screen m2 and a sub screen si are displayed.
- the main screen m3 and the sub screen s2 are displayed on the display screen.
- a superimposed image signal obtained by synthesizing the main image signal of the main screen m6 and the sub-image signal of the sub-screen s5 in the frame memory causes the main screen to be displayed on the display screen. m6 and the sub screen s5 are displayed.
- the sub image signal of the sub screen s6 sufficient to be synthesized with the main image signal is written in the frame memory. Accordingly, a superimposed image signal is generated by combining the main image signal of the main screen m8 and the sub image signal of the sub screen s6, and the main screen m8 and the sub screen s6 are displayed on the display screen.
- a moving image to be displayed in the order of sub-screen s5, sub-screen s6, and sub-screen s7 is displayed in the order of sub-screen s5, sub-screen s5, sub-screen s6, and sub-screen s7.
- frame overlap (the same image is displayed) occurs.
- FIG. 1 illustrates the case where the frame of the sub screen is longer than the frame of the main screen.
- the sub screen of the frame memory is displayed. Before that, the sub-screen to be displayed next is written, and a frame drop occurs in which a frame at a certain time is lost.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2000-270260
- the first video signal and the second video signal are combined based on the synchronization signal of the first video signal (main image signal). Therefore, if a graphic image signal such as a car navigation system is input as the first video signal and a moving image image signal such as a TV, video, or DVD is input as the second video signal, frame dropping occurs.
- a graphic image signal such as a car navigation system
- a moving image image signal such as a TV, video, or DVD
- This problem can be improved by inputting a video signal of a moving image as the first video signal and inputting a video image signal as the second video signal.
- a video signal of a moving image as the first video signal
- a video image signal as the second video signal.
- the clock is generated based on the synchronization signal of the first video signal.
- the image signal of the television is weak and the synchronization signal cannot be detected.
- the operation is performed based on the synchronization signal of the first video signal and the synchronization signal of the first video signal, if the synchronization signal of the first video signal cannot be detected, Not only the image of the first video signal but also the image of the second video signal is affected, and during the period in which the synchronization signal of the first video signal cannot be detected, the images of the first and second video signals are affected.
- One example is the problem of not being able to display.
- the present invention has been made in view of the above, and when performing two-screen display, prevents frame skipping and frame superposition of a fast-moving image of two images, and provides a more stable two-screen display. It is an object to obtain an image processing apparatus and an image processing method for performing display.
- the invention according to claim 1 provides a superimposed image signal obtained by combining the first and second image signals in order to display an image on two screens.
- the invention according to claim 2 is the image processing apparatus according to claim 1, wherein the first and second image signals are combined to generate a superimposed image signal in order to display an image on two screens.
- Storage means for holding an image signal; and when the synchronization signal of the second image signal is input within a predetermined detection time, the synchronization signal of the second image signal is used as a reference synchronization signal. Output and the synchronization signal of the second image signal is not input within the detection time.
- the synchronization signal switching means for outputting the synchronization signal of the first image signal as the reference synchronization signal; a clock generated based on the synchronization signal of the first image signal; Storage control means for causing the storage means to hold a first image signal based on the synchronization signal of the image signal and the reference synchronization signal, and for controlling to read the first image signal from the storage means;
- a superimposed image signal generating means for generating a superimposed image signal for two-screen display based on the first image signal and the second image signal held in the storage means; and the clock and the second image signal.
- a superimposition control signal generating means for generating a superimposition control signal for controlling the superimposed image signal generating means based on synchronization of the image signal.
- the image of the first image signal and the image of the second image signal stored in the memory are superimposed.
- a clock generated based on a synchronization signal of the first image signal, a synchronization signal of the first image signal, and a synchronization signal of the second image signal.
- the image of the first image signal and the image of the second image signal stored in the memory are superimposed.
- the image processing method for generating an image signal when the synchronization signal of the second image signal is input within a predetermined detection time, the synchronization signal of the second image signal is used as a reference synchronization signal.
- a synchronization signal switching step of determining the synchronization signal of the first image signal as the reference synchronization signal;
- a first image signal is held in the memory based on a clock generated based on a synchronization signal of the first image signal, a synchronization signal of the first image signal, and the reference synchronization signal. And read the first image signal from the memory.
- FIG. 1 is a timing chart for explaining the operation of a conventional two-screen display device.
- FIG. 2 is a block diagram showing an example of a configuration of a two-screen display system to which the image display device according to the present invention is applied.
- FIG. 3 is a block diagram showing an example of a configuration of the image processing device shown in FIG. 2.
- FIG. 4 is a timing chart for explaining an operation of the image processing apparatus according to the first embodiment of the present invention.
- FIG. 5 is a timing chart for explaining the operation of the image processing apparatus according to the first embodiment of the present invention.
- FIG. 6 is a timing chart for explaining the operation of the image processing apparatus according to the first embodiment of the present invention.
- FIG. 7 is a block diagram showing an example of a configuration of the image processing device shown in FIG. 2.
- FIG. 8 is a block diagram showing an example of a configuration of the image processing device shown in FIG. 2.
- FIG. 9 is a block diagram illustrating an example of a configuration of an image processing apparatus according to a second embodiment of the present invention.
- FIG. 10 is a timing chart for explaining an operation of the image processing apparatus according to the second embodiment of the present invention.
- Composite images such as televisions, videos, and DVDs change faster than graphic images, such as car navigation system map images. For this reason, if dropped frames or overlapping frames occur in the composite image, the viewer feels more uncomfortable than if dropped frames or overlapping frames occurred in the graphic image. In other words, for example, when the TV image and the car navigation map information are displayed on two screens, the frame information is added to the car navigation map information rather than dropping frames or overlapping frames in the TV image. Viewers feel less uncomfortable when overlapping or dropped frames occur.
- the image signal of a television changes depending on the reception state of radio waves. Power that does not move, such as a vehicle ⁇ Especially susceptible to radio wave reception. Therefore, the period of the synchronization signal in the image signal is not always constant. In contrast, the cycle of the synchronization signal in the image signal from a DVD or CD-ROM is stable, as in a car navigation system.
- the present invention provides
- the cycle of the synchronization signal in the image signal from the DVD or CD-ROM as in the car navigation system is the same as that of the synchronization signal in the image signal from the DVD or CD-ROM as in the car navigation system.
- the period is stable without being affected by the reception condition of radio waves
- a synchronizing signal of a composite image signal and a clock generated based on a synchronizing signal of a graphic image signal are used.
- FIG. 2 is a block diagram showing an example of a configuration of a two-screen display system to which the image display device according to the present invention is applied.
- the two-screen display system to which the image display device according to the present invention is applied includes a car navigation device 1, a TV receiving device 3, an image processing device 5, and a display device 7.
- the device for outputting an image signal to the image processing device 5 is not limited to the car navigation device 1 and the TV receiving device 3, and a device for outputting a graphic image signal is connected instead of the car navigation device 1.
- a DVD player or a video device may be connected instead of the TV receiver 3.
- the car navigation system 1 combines position information transmitted from a GPS (Global Positioning System) satellite with map information recorded on a CD-ROM or DVD software to convert the map information into an image signal (graphic). Is output to the image processing device 5.
- the TV receiver 3 is a television receiver, and outputs a received image signal (composite) to the image processor 5.
- the image processing device 5 receives input from the car navigation device 1 to display the image signal input from the car navigation device 1 and the image signal input from the TV receiver 3 on the display device 7 on two screens.
- a superimposed image signal is generated by combining the input image signal and the image signal input from the TV receiver 3.
- the display device 7 is configured by, for example, a liquid crystal display or the like, and a screen or a screen based on a superimposed image signal generated by the image processing device 5. That is, it is a display means for performing a two-screen display of a main screen 71 and a sub screen 72. In FIG. 2, it is assumed that the image of the car navigation device is displayed on the main screen 71, and the image of the television is displayed on the sub screen 72.
- the display positions of the main screen 71 and the sub screen 72 are not limited to this, and the main screen 71 and the sub screen 72 may be displayed on the screen of the display device 7.
- FIG. 3 is a block diagram showing an example of the configuration of the image processing device 5 shown in FIG.
- the image processing device 5 includes a synchronization separation unit 51 that detects a main synchronization signal MV from a main image signal (a first image signal in the claims), a sub-image signal (a claim in the claims).
- Synchronization separation unit 61 that detects sub-synchronization signal SV from second image signal
- clock generation unit 52 that generates clock CKM
- clock generation unit 62 that generates clock CKS
- analog that digitally converts the analog main image signal 'A digital conversion unit (hereinafter referred to as an A / D conversion unit) 53
- an AZD conversion unit 63 that converts an analog sub-image signal into a digital signal
- a frame memory 54 that temporarily holds the digitally converted main image signal 54 Storage means in the range
- a synchronization determination memory control section 55 for controlling the frame memory 54 (a storage control section in the claims)
- a signal weight for controlling the superposition section 56.
- the control unit 57 (a superimposition control signal generating means in the claims), and the superimposition unit 56 that combines the main image signal held in the frame memory 54 and the digitally converted sub image signal (claim) (Superimposed image signal generation means).
- the synchronization separation unit 51 detects a main synchronization signal MV, which is a vertical synchronization signal, from a graphic image signal (analog main image signal) input from the car navigation device 1, and clocks the detected main synchronization signal MV. Output to the generation unit 52 and the synchronization determination memory control unit 55.
- the clock generation unit 52 generates a clock CKM based on the main synchronization signal MV detected by the synchronization separation unit 51, and uses the generated clock CKM as a synchronization determination memory control unit 55 and a signal superposition control unit 57. Is output to the AZD converter 53.
- the AZD converter 53 converts an analog main image signal into a digital main image signal based on the clock CKM generated by the clock generator 52, and converts the converted digital main image signal into a frame memory 54.
- the synchronization separation section 61 detects a sub-synchronization signal SV as a vertical synchronization signal from a composite (analog sub-image signal) input from the TV receiver 3, and detects the detected sub-synchronization signal SV To the clock generation unit 62, the synchronization determination memory control unit 55, and the signal superposition control unit 57.
- the clock generation section 62 generates a clock CKS based on the sub-synchronization signal SV detected by the synchronization separation section 61, and outputs the generated clock CKS to the A / D conversion section 63.
- the AZD conversion unit 63 converts an analog sub image signal into a digital sub image signal based on the clock CKS generated by the clock generation unit 62, and outputs the converted digital sub image signal to the superposition unit 56. Output.
- the synchronization determination memory control unit 55 includes a clock CKM generated by the clock generation unit 52, a main synchronization signal MV detected by the synchronization separation unit 51, and a sub synchronization signal detected by the synchronization separation unit 61. Based on the SV, the digital main image signal converted by the AZD conversion unit 53 is written to the frame memory 54, and the main image signal written to the frame memory 54 is read and output to the superimposition unit 56. That is, the synchronization determination memory control unit 55 controls access to the frame memory 54 based on the clock CKM generated from the main image signal and the sub-synchronization signal SV detected from the sub-image signal.
- the signal superposition control unit 57 controls the synchronization determination memory control unit 55 based on the clock CKM generated by the clock generation unit 52 and the sub-synchronization signal SV detected by the synchronization separation unit 61, and controls the frame memory.
- a superimposition control signal for controlling a superimposition unit 56 that generates a superimposed image signal by synthesizing the main image signal read from 54 and the sub-image signal that has been digitally converted by the A / D converter 63 is generated.
- the signal superposition control section 57 outputs the superposition control signal to the superposition section 56, and the superposition section 56 generates a superimposed image signal based on the superposition control signal.
- the superimposing unit 56 performs the main image signal in the frame memory 54 and the sub image signal based on the clock CKM generated by the sub synchronization signal SV detected from the sub image signal and the main synchronization signal MV of the main image signal.
- the signal is combined with the signal to generate a superimposed image signal.
- the display synchronization signal is one of the superimposition control signals output from the signal superimposition control unit 57, and is used as a vertical synchronization signal of the superimposed image signal.
- the display synchronization signal is a signal synchronized with the sub synchronization signal SV.
- the sub synchronization signal SV is used as the display synchronization signal.
- the main screen is a screen image when the main image signal in the frame memory 54 is displayed, and the sub screen is a screen image when the sub image signal digitally converted by the AZD converter 63 is displayed.
- an analog main image signal is input in the order of the main screen ml, m2,..., Ml8 and stored in the frame memory 54, and the sub-screens si, s2, ⁇ -, and sl5 are sequentially displayed.
- the analog sub image signal is input, and the sub image signal digitally converted by the A / D conversion unit 63 is output to the superimposition unit 56.
- the superimposition unit 56 combines the main image signal of the main screen ml in the frame memory 54 and the sub image signal of the sub screen s2 to generate a superimposed image signal.
- the main screen ml of the display device 7 displays the main screen ml
- the sub screen 72 displays the sub screen s2.
- the superimposition unit 56 combines the image signal of the main screen m2 in the frame memory 54 and the sub-image signal of the sub-screen s3 to generate a superimposed image signal.
- the main screen m2 is displayed on the main screen 71 of the display device 7, and the sub screen s3 is displayed on the sub screen 72.
- the writing of the main image signal of the main screen m6 to the frame memory 54 is completed, and the writing of the main image signal of the main screen m7 is started. That is, since the time of the frame of the main image signal is shorter than the time of the frame of the sub image signal, from time t20 to time t24, the screen display is 5 frames, whereas the main screen is 6 frames. .
- the synchronization determination memory control unit 55 detects that an error of one screen has occurred between the main image signal and the sub image signal based on the main synchronization signal MV and the sub synchronization signal SV, and reads the main image signal read from the frame memory 54. Skip one screen.
- the synchronization determination memory control unit 55 reads the main image from the frame memory 54.
- the main image signal of the main screen m6, which is not the main image signal of the surface m5 is read and output to the superimposing unit 56.
- the superimposing unit 56 generates a superimposed image signal obtained by combining the main image signal of the main screen m6 and the sub image signal of the sub screen s6. Therefore, between time t24 and time t25, main screen m6 is displayed on main screen 71, and sub-screen s6 is displayed on sub-screen 72. That is, a frame drop of the main screen m5 occurs between the time t23 and the time t25.
- the main screen is a graphic display and moves slower than a moving image on a television, the discomfort of the viewer on the screen display is reduced as compared with a case where frames drop in a moving image.
- the display synchronization signal is one of the superimposition control signals output from the signal superimposition control unit 57, and is used as a vertical synchronization signal of the superimposed image signal.
- the display synchronization signal is a signal synchronized with the sub synchronization signal SV, and here, the sub synchronization signal SV is used as the display synchronization signal.
- the main screen is a screen image when the main image signal in the frame memory 54 is displayed, and the sub screen is a screen image when the sub image signal digitally converted by the A / D converter 63 is displayed. .
- an analog main image signal is input in the order of main screen ml, m2,..., Ml8 and held in the frame memory 54, and the sub-screens si, s2,.
- the analog sub image signal is input, and the sub image signal digitally converted by the A / D conversion unit 63 is output to the superimposition unit 56.
- the superimposition unit 56 combines the main image signal of the main screen ml in the frame memory 54 with the sub image signal of the sub screen s2, and generates a superimposed image signal. With the superimposed image signal, the main screen 71 of the display device 7 displays the main screen 0, and the sub screen 72 displays the sub screen s2.
- the superimposition unit 56 combines the image signal of the main screen m2 in the frame memory 54 and the sub-image signal of the sub-screen s3 to generate a superimposed image signal.
- the main screen ml of the display device 7 is displayed on the main screen 71, and the sub screen s3 is displayed on the sub screen 72.
- the writing of the main image signal of the main screen mlO started from time t33 to frame memory 54 is continued, and the synthesis of the main image signal and the sub image signal in the frame memory is started. .
- the main screen mlO and the sub screen si 2 should be displayed on the display device.
- the main image signal of the main screen mlO has not been written to the frame memory 54. Therefore, the main image signal of the main image mlO cannot be read from the main frame memory 54. This is because since the frame time of the main image signal is longer than the frame time of the sub-image signal, between the time t30 and the time t34, there are 11 screen displays, but the frame memory 54 stores the frame data. This is because all the written main image signals have only 9 frames.
- the synchronization determination memory control unit 55 detects that an error has occurred between the main image signal and the sub image signal based on the main synchronization signal MV and the sub synchronization signal SV, and reads out from the frame memory 54 one screen before. Read the main screen again.
- the synchronization determination memory control unit 73 reads the main image signal of the main screen m9 from the frame memory 54 and outputs it to the superimposition unit 56. Thereby, the superimposing unit 56 generates a superimposed image signal obtained by synthesizing the main image signal of the main screen m9 and the image signal of the sub screen si2. Therefore, between time t34 and time t35, main screen m9 is displayed on main screen 71, and sub-screen s12 is displayed on sub-screen 72. That is, a frame overlap of the main screen m9 occurs between the time t33 and the time t35.
- the main screen is a graphic display and moves slower than the moving image on the television, the discomfort of the viewer on the screen display is reduced as compared with the case where frame overlapping occurs in the moving image.
- the image processing apparatus 5 receives the graphic image signal as the main image signal, the television image signal as the sub image signal, and performs the vertical synchronization of the main image signal.
- the two image signals are synthesized using the clock CKM synchronized with the main synchronization signal MV, which is a signal, and the display synchronization signal controlled by the vertical synchronization signal of the sub-image signal.
- the display synchronization signal is one of the superimposition control signals output from the signal superimposition control unit 57, and is used as a vertical synchronization signal of the superimposed image signal.
- the display synchronization signal is a signal synchronized with the sub synchronization signal SV.
- the sub synchronization signal SV is used as the display synchronization signal.
- the main screen is a screen image when the main image signal in the frame memory 54 is displayed, and the sub screen is a screen image when the sub image signal digitally converted by the A / D converter 63 is displayed. .
- an analog main image signal is input in the order of the main screen ml, m2,..., Ml8 and stored in the frame memory 54, and the sub-screens si, s2, ⁇ -, sl8 are sequentially displayed.
- the analog sub image signal is input, and the sub image signal digitally converted by the A / D conversion unit 63 is output to the superimposition unit 56.
- the sub-image signal of the main screen ml in the frame memory 54 and the sub-image signal of the sub-screen s2 are combined by the superimposition unit 56 to generate a superimposed image signal.
- the main screen ml of the display device 7 displays the main screen ml
- the sub screen 72 displays the sub screen s2.
- the sub-image signal of sub-screen s2 ends, but until time t43, the sub-synchronization signal SV is not detected due to switching of the sub-image signal. That is, at time t42, the sub-image signal of the sub-screen s2 in the PAL system ends, and at time t43, the sub-image signal of the sub-screen s3 in the NTSC system is input. The signal SV is not detected, and the display time of the main screen ml and the sub screen s2 becomes longer than the original display time of the sub screen si.
- the superimposition unit 56 combines the main image signal of the main screen m2 held in the frame memory 54 and the sub image signal of the sub screen s3. And a superimposed image signal is generated.
- the superimposed image signal the main screen m2 is displayed on the main screen 71 of the display device 7, and the sub-screen s3 is displayed on the sub-screen 72.
- the sub-image signal according to the NTSC method is input, so that the frame of the main image signal is longer than the frame of the sub-image signal. Therefore, at time t44, writing of the main image signal of the main screen mil to the frame memory 54 is started. At the same time, the process of synthesizing the main image signal and the sub image signal in the frame memory 54 is started. However, the main image signal of the main screen mil is only activated when the writing to the frame memory 54 is started, and the main image signal of the main screen mil cannot be read from the frame memory 54.
- the synchronization determination memory control unit 55 holds the main image signal to be read next in the frame memory 54 based on the main synchronization signal MV and the sub synchronization signal SV (in this case, the main screen ml 1
- the main image signal of the newest main screen mlO stored in the frame memory 54 is read out again and output to the superimposing unit 56.
- the superimposing unit 56 generates a superimposed image signal by combining the main image signal of the main screen mlO and the sub image signal of the sub screen sl2. Therefore, from time t44, main screen mlO is displayed on main screen 71, and sub-screen sl2 is displayed on sub-screen 72.
- a frame overlap of the main screen mlO occurs between time t44 and time t46. Since the main screen is a graphic display and moves slower than the moving image on the TV, the viewer's discomfort with the screen display is reduced compared to the case where frames overlap in the moving image. It is.
- the sub-image signal of sub-screen si2 ends, but until time t46, the sub-synchronization signal SV is not detected due to the switching of the sub-image signal. That is, at time t45, the sub-image signal of sub-screen si2 in the NTSC system ends, and at time t46, the sub-image signal of sub-screen sl3 in the PAL system is input at time t46.
- the synchronization signal SV is not detected, and the display time of the main screen mlO and the sub screen sl2 is longer than the original display time of the sub screen si2.
- the main image signal of main screen mi l held in frame memory 54 and the sub image signal of sub screen sl 3 are superimposed.
- the combined image signal is generated by the unit 56.
- the main screen mi l is displayed on the main screen 71 of the display device 7 and the sub screen si 3 is displayed on the sub screen 72 by the superimposed image signal.
- the image processing device 5 of the first embodiment switches the sub-image signal to the display screen until the next sub-synchronization signal SV is detected.
- the previously displayed image remains displayed and is longer than the original display time, but the image on the main screen is not disturbed.
- the image processing device 5 of the first embodiment inputs a graphic image signal as a main image signal, inputs a television image signal as a sub image signal, Since two image signals are synthesized using a clock CKM synchronized with the main synchronization signal MV, which is a vertical synchronization signal, and a display synchronization signal controlled by the vertical synchronization signal of the sub-image signal, car navigation is performed.
- MV main synchronization signal
- a display synchronization signal controlled by the vertical synchronization signal of the sub-image signal car navigation is performed.
- the configuration of the image processing apparatus according to the first embodiment is not limited to the image processing apparatus 5 shown in FIG. 3, but may be, for example, an image processing apparatus 5a as shown in FIG. Such an image processing device 5b may be used.
- the components having the same functions as those of the image processing device 5 shown in FIG. 3 are denoted by the same reference numerals, and overlapping description will be omitted.
- the image processing device 5a shown in FIG. 7 includes a clock phase control unit 64 instead of the clock generation unit 62 of the image processing device 5 shown in FIG.
- the clock phase control unit 64 generates a clock CKS1 in which the phase of the clock CKM generated by the clock generation unit 52 is adjusted so as to be synchronized with the sub-synchronization signal SV detected by the synchronization separation unit 61. That is, the image processing device 5a generates a clock CKS1 by adjusting the phase of the generated clock CKM based on the main synchronization signal MV so as to be synchronized with the sub synchronization signal SV, and generates the clock CKS1 by using the generated clock CKS1. Since the sub-image signal is converted to digital, a one-clock system can be realized.
- a graphic image signal is input as a main image signal
- a television image signal is input as a sub image signal
- the image signal is synchronized with a main synchronization signal MV which is a vertical synchronization signal of the main image signal.
- the two image signals are synthesized using the clock CKM and the display synchronization signal controlled by the sub-synchronization signal SV, which is the vertical synchronization signal of the sub-image signal, the graphic display of the car navigation system and the TV image
- the 8 includes a frame memory 65 for temporarily storing a sub-image signal between the A / D conversion unit 63 and the superimposition unit 56 of the image processing device 5 shown in FIG. Has been added.
- the image processing device 5b also holds the sub-image signal in the frame memory 65, and the synchronization determination memory control unit 55 controls access to the frame memory 65.
- a graphic image signal is input as a main image signal
- a television image signal is input as a sub image signal
- the main image signal is synchronized with a main synchronization signal MV which is a vertical synchronization signal of the main image signal.
- the two image signals are synthesized using the clock CKM and the display synchronization signal controlled by the sub-synchronization signal SV, which is the vertical synchronization signal of the sub-image signal, the graphic display of the car navigation system and the TV image
- the sub image signal is also stored in the frame memory 65, image processing such as compression and expansion can be performed on the sub image signal of the sub screen.
- FIG. 9 is a block diagram illustrating an example of a configuration of an image processing device 5c according to the second embodiment of the present invention.
- a synchronization signal switching unit 58 is added to the image processing device 5 of the first embodiment shown in FIG.
- Components having the same functions as those of the image processing device 5 of the first embodiment are denoted by the same reference numerals, and redundant description will be omitted.
- the synchronization signal switching unit 58 determines whether or not the sub-synchronization signal SV is input within a predetermined detection time, and when the sub-synchronization signal SV is input within the detection time, The sub synchronization signal SV is output to the synchronization determination memory control unit 55 and the signal superimposition control unit 57 as the reference synchronization signal V. If the sub-synchronization signal SV is not input within the detection time, the synchronization signal switching unit 58 generates a pseudo-synchronization signal instead of the sub-synchronization signal SV, and uses the generated pseudo-synchronization signal as the reference synchronization signal V To the synchronization determination memory control unit 55 and the signal overlap control unit 57.
- the synchronization signal switching unit 58 uses the main synchronization signal MV as the reference synchronization signal V and generates the synchronization determination memory control unit 55 and the signal superimposition control until the sub-synchronization signal SV is input after the pseudo-synchronization signal is generated. Output to section 57. That is, for example, when the sub-signal signal cannot be received due to poor radio wave conditions and the sub-synchronization signal SV cannot be detected, the synchronization signal switching unit 58 uses the pseudo-synchronization signal simulating the sub-synchronization signal SV as a reference.
- the main image is output as the synchronization signal V to the synchronization determination memory control unit 55 for a fixed time and the signal superposition control unit 57.
- the main synchronization signal MV of the signal is output to the synchronization determination memory control unit 55 and the signal superimposition control unit 57 as the reference synchronization signal V instead of the sub synchronization signal SV.
- the display synchronization signal is one of the superposition control signals output from the signal superposition control unit 57, and is used as a vertical synchronization signal of the superimposed image signal.
- the display synchronization signal is a signal synchronized with the reference synchronization signal V.
- the reference synchronization signal V is used as the display synchronization signal.
- the main screen is a screen image when the main image signal in the frame memory 54 is displayed, and the sub screen is a screen image when the sub image signal digitally converted by the A / D converter 63 is displayed. is there.
- an analog main image signal is input in the order of main screen ml, m2, ..., ml8 and held in frame memory 54, and sub-screens si, s2, ..., sl5 are sequentially displayed.
- the analog sub image signal is input, and the sub image signal digitally converted by the A / D conversion unit 63 is output to the superimposition unit 56.
- the main image signal of the main screen ml in the frame memory 54 and the sub image signal of the sub screen s2 are combined by the superimposition unit 56, and a superimposed image signal is generated.
- the superimposed image signal the main screen ml of the display device 7 displays the main screen ml, and the sub screen 72 displays the sub screen s2.
- the synchronization signal switching unit 58 synchronizes the pseudo synchronization signal with the reference synchronization signal.
- the signal V is output to the synchronization determination memory control unit 55 and the signal superimposition control unit 57.
- the memory control unit 55 controls access to the frame memory 54 based on the reference synchronization signal V, the main synchronization signal MV, and the clock CKM, and reads the main image signal of the main screen m3 in the frame memory 54. And outputs it to the superimposition unit 56. Further, the signal superimposition control section 57 generates a superimposition control signal based on the reference synchronization signal V and the clock CKM and outputs the generated superimposition control signal to the superimposition section 56.
- the image signal and are synthesized to generate a superimposed image signal. That is, at time t53, the pseudo-sync signal generated by the sync signal switching unit 58 is used as a display sync signal to generate a superimposed image signal.
- the sub-image signal cannot be displayed because the reception state is badly disturbed, but the main screen 71 displays the main screen m3.
- main synchronization signal MV is input to synchronization signal switching section 58. Since the sub-synchronization signal SV is not detected between the time t54 and the time t55 when the pseudo synchronization signal is generated, the synchronization signal switching unit 58 sets the main synchronization signal MV as the reference synchronization signal V to the synchronization determination memory control unit 55. The signal is output to the signal superposition control unit 57. As a result, the superimposed image signal is generated using the main synchronization signal MV as the display synchronization signal. At time t55, the writing of the main image signal of the main screen m5 to the frame memory 54 is completed, and the writing of the main image signal of the main screen m6 is started.
- the synchronization determination memory control unit 55 Since the synchronization determination memory control unit 55 has read the main image signal of the main screen m3 immediately before, it detects that an error of one screen has occurred, and converts the main image signal read from the frame memory 54 into one. Skip screens. That is, the synchronization determination memory control unit 55 reads the main image signal of the main screen m5 from the frame memory 54. Therefore, the main screen m5 is displayed on the main screen 71, and a frame drop of the main screen m4 occurs.
- the synchronization signal switching unit 58 Since the sub-synchronization signal SV is not detected until time t57, the synchronization signal switching unit 58 outputs the main synchronization signal MV as the reference synchronization signal V. Therefore, the display synchronization signal has the same timing as the main synchronization signal MV. That is, a superimposed image signal is generated based on the main synchronization signal MV, and the main screens m6 and m7 are displayed on the main screen 71.
- the reception state of the television image signal by the TV receiver 3 is recovered, and the sub-synchronization signal SV is detected.
- the synchronization signal switching unit 5 8 outputs the main synchronization signal MV as the reference synchronization signal V.
- the synchronization signal switching unit 58 does not output the sub synchronization signal SV as the reference synchronization signal V. Since the sub-image signal of the sub-screen s7 is input to the superposition unit 56, the main screen m7 is displayed on the main screen 71 and the sub-screen s7 is displayed on the sub-screen 72 from time t57.
- main synchronization signal MV is detected.
- the synchronization signal switching unit 58 does not output the main synchronization signal MV as the reference synchronization signal V. Therefore, the time during which the main screen m7 is displayed on the display device 7 is longer than the time during which the main screen m6 is displayed.
- sync signal switching section 58 outputs sub-sync signal SV as reference sync signal V. Accordingly, the display synchronization signal has the same timing as the sub synchronization signal SV, and the main screen m8 is displayed on the main screen 71, and the sub screen s8 is displayed on the sub screen 72. Thereafter, a superimposed image signal is generated by the sub-sync signal SV until the sub-sync signal SV is no longer detected within the detection time.
- the synchronization signal switching unit 58 generates the superimposed image signal when the sub-synchronization signal SV is not detected by the synchronization separation unit 61 within a predetermined detection time.
- the reference synchronization signal V for synchronization to the sub-synchronization signal SV and the pseudo-synchronization signal or the main synchronization signal MV, even if the sub-synchronization signal SV cannot be detected due to poor reception of the TV video image signal, car navigation can be performed.
- the system graphics screen can be displayed stably.
- the synchronization signal switching unit 58 switches between the sub-synchronization signal SV and the main synchronization signal MV.
- the signal switching unit 58 should be set externally so that the mode in which only the sub-synchronous signal SV is output as the reference synchronous signal V without switching the synchronous signal can be fixed. Is desirable.
- the sub image signal may be any video signal.
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Cited By (2)
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JP2012156615A (ja) * | 2011-01-24 | 2012-08-16 | Seiko Epson Corp | 画像表示装置および画像表示方法 |
JP2017079363A (ja) * | 2015-10-19 | 2017-04-27 | 株式会社デンソー | 半導体集積回路装置及び車両周辺撮影システム |
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JPH0622236A (ja) * | 1992-06-30 | 1994-01-28 | Nec Ic Microcomput Syst Ltd | 複数画像表示装置 |
JPH0918800A (ja) * | 1995-06-30 | 1997-01-17 | Sony Corp | 画像表示装置 |
JP2003134414A (ja) * | 2001-10-22 | 2003-05-09 | Pioneer Electronic Corp | 映像処理装置及び映像処理方法並びに映像処理用プログラム |
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JPH0622236A (ja) * | 1992-06-30 | 1994-01-28 | Nec Ic Microcomput Syst Ltd | 複数画像表示装置 |
JPH0918800A (ja) * | 1995-06-30 | 1997-01-17 | Sony Corp | 画像表示装置 |
JP2003134414A (ja) * | 2001-10-22 | 2003-05-09 | Pioneer Electronic Corp | 映像処理装置及び映像処理方法並びに映像処理用プログラム |
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Publication number | Priority date | Publication date | Assignee | Title |
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JP2012156615A (ja) * | 2011-01-24 | 2012-08-16 | Seiko Epson Corp | 画像表示装置および画像表示方法 |
JP2017079363A (ja) * | 2015-10-19 | 2017-04-27 | 株式会社デンソー | 半導体集積回路装置及び車両周辺撮影システム |
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