JP4572603B2 - Image display device - Google Patents

Description

  The present invention relates to an image display device that records an image displayed on a display as a still image.

  In recent years, video technology has improved and HDTV (High Definition Television), which has higher image quality than NTSC (National Television System Committee standard) and PAL (Phase Alternating Line standard), which are terrestrial television signals, There is a video signal called EDTV (Enhanced Definition Tele Vision). A high-quality video signal has a larger number of pixels than a conventional video signal. In order to display a high-quality video signal and a conventional video signal on the same display, a device called a scan converter is provided that changes the scanning frequency in accordance with the resolution of the display. Some conventional scan converters display an image by converting various video signals into the number of scanning lines corresponding to the single frequency by signal processing while maintaining the single scanning frequency (for example, Patent Documents). 1).

  Some image display devices have a function of converting the frequency of an image signal and recording an image displayed on a display as a still image. Since the image displayed on the display is temporarily stored in the frame memory of the above-described scan converter, the recorded image is different from the image displayed on the display.

  An example of a conventional image display apparatus 200 will be described with reference to FIG. In the image display device 200, the video signal input via the input circuit 209 is output to the switching circuit 208. The video signal output from the switching circuit 208 is output to the scan converter 202 and the recording processing unit 206. The scan converter 202 stores the input video signal in the frame memory 203 and outputs it to the display 204. On the other hand, when the user instructs recording of the displayed image, the control microcomputer 205 outputs a command to the recording processing unit 206. The recording processing unit 206 causes the recording processing unit 206 to record the video signal input from the input circuit 209 as a still image. An image recorded as a still image by the recording processing unit 206 is a video that is advanced by several frames from the image displayed on the display 204 by the scan converter 202.

  In addition, the user normally instructs the remote controller 207 to record a still image, but the time until the control microcomputer 205 receives the signal output from the remote controller 207 and outputs a command to the recording processing unit 206 is determined. In short, when a command arrives at the recording processing unit 206, a different screen may be displayed on the display 204.

  When images are continuous, a difference of several frames is not a big difference, but when there is a scene change between these frames, the image displayed on the display and the recorded image are completely different. The image intended by the user may not be recorded.

JP-A-10-319932

  The present invention has been made in view of the above-described problems, and is an image displayed on a display when a user instructs recording in an image display apparatus having a function of recording an image to be displayed on a display as a still image. An object of the present invention is to provide an image display device that matches an image that is actually recorded as a still image.

In order to achieve the above-described object, an image display apparatus according to the present invention includes a video signal input unit that inputs a video signal, and a frequency conversion corresponding to the resolution of the predetermined display unit for the video signal . An image output means for supplying the image signal having been subjected to the display to the display means via the frame memory and displaying an image on the display means, and a video input by the video signal input means in response to an external still image recording instruction signal A storage means for storing the signal, a switching means for outputting at least one of the video signal input by the video signal input means or the video signal stored in the storage means to the image output means, and a still image recording instruction signal from the outside Te, and control means for outputting a control signal for controlling the storing operation of the storage means in the storage means, if the storage unit, which has received the control signal the control means outputs The storage means stores one frame of video signals input by the video signal input means upon receiving a control signal, switching means, a video signal for one frame stored in the storage means Output to the image output means, and the image output means performs frequency conversion on the video signal for one frame output from the switching means, and causes a predetermined display means to display a still image based on the video signal for one frame. .

The image display device of the present invention, when receiving the recording instruction for the image displayed on the Viewing means stores the video signal input in the storage means to output the video signal stored in the storage unit to the frequency converting means. Since the video signal output to the frequency conversion unit is displayed on the display unit, the user can actually visually confirm the image recorded by the recording control unit.

  In addition, by generating an image in which the video signal input by the input means and the video signal stored in the storage means are generated, the user can actually check the recorded image without missing the video being played back. can do.

  An image display device to which the present invention is applied has a function of displaying a video signal on a display and recording one frame of the displayed image as a still image. An image display device to which the present invention is applied outputs an image displayed on a display and an image recorded as a still image to the display. Thereby, the user can confirm the image recorded as a still image.

  The configuration of the image display device 1 will be described with reference to FIG. Hereinafter, the configuration of the image display apparatus 1 will be described separately for a reproduction system, a recording system, and a control system. The reproduction system of the image display apparatus 1 includes a scan converter 2 and a frame memory 3. The scan converter 2 performs frequency conversion of the video signal according to the scanning order and resolution of the display 4. The scanning order of the display 4 includes “sequential scanning” and “interlaced scanning”. A method of “sequential scanning” is used for the display 4 for a personal computer, and “interlaced scanning” is used for a screen for a television. The display 4 for personal computers includes VGA (Video Graphics Array), SVGA (Super VGA), XGA (eXtended Graphics Array), and the like depending on the resolution. The scan converter 2 converts the scanning frequency according to the resolution of the display 4.

  Furthermore, conventional analog signals such as NTSC (National Television System Committee standard), PAL (Phase Alternating Line standard), SECAM, HDTV (High Definition Television), EDTV There are high quality video signals such as (Enhanced Definition Tele Vision). The scan converter 2 up-converts a conventional analog signal into a high-quality video signal or down-converts a high-quality video signal into a conventional analog signal.

  The scan converter 2 down-converts RGB signals (Red Green Blue code) for personal computers into television video signals, and up-converts television and video video signals into personal computer video signals. .

  The frame memory 3 is a storage area for a video signal displayed on the display 4. The number of frames stored in the frame memory 3 varies depending on the performance of the scan converter 2. The number of frames is at least two. If processing such as motion compensation is performed, it is necessary to store three or more frames. Here, three frames are stored in the frame memory 3.

  The control system includes a control microcomputer 5, a recording processing unit 6, a remote controller 7, and a switching circuit 8. Processing of the control system will be described with reference to FIG. The remote controller 7 is provided with a still image recording key 11 for recording a still image. When the still image recording key 11 is pressed, the control microcomputer 5 issues a control command to the recording processing unit 6 and the scan converter 2 (step S11).

  The scan converter 2 stops the input of the video signal in response to a command from the control microcomputer 5 and outputs the frame stored in the frame memory 3 to the display 4. The frame instructed to be recorded by the user is displayed on the display 4 and then erased from the frame memory 3 (step S12). On the other hand, the recording processing unit 6 stores the first frame of the video signal input from the input circuit 9 in the memory 10. This frame is several frames ahead of the frame designated by the user for recording (step S13). In other words, a difference of several frames is generated between the frame designated by the user for recording and the frame actually recorded in the semiconductor memory 15.

  Next, the recording processing unit 6 outputs the frame stored in the memory 10 to the switching circuit (step S14). As shown in FIG. 3A, the switching circuit 8 switches the input destination from input 1 to input 2, that is, from the input circuit 9 to the recording processing unit 6 (step S15).

  The image stored in the memory 10 is displayed on the display 4 by the process of step S15. FIG. 4 shows the relationship between the frame input by the scan converter 2 and the frame displayed on the display 4. Assume that frames are input to the scan converter 2 in the order of A, B, C, D, E, F, G, and H. In FIG. 4, the user instructs to record a still image at time t <b> 1, and the user's instruction arrives at the recording processing unit 6 from the control microcomputer 5 at time t <b> 2 and the input image signal is stored in the memory 10. Since the image signal displayed on the display 4 at time t1 is frame A, and the video signal stored in the memory 10 at time t2 is frame E, it is actually the frame when the user instructs recording of a still image. There is a difference of 4 frames from the frame recorded as a still image. If there is a screen change or the like between these differences, an image unexpected by the user may be recorded as a still image. The image display apparatus 1 to which the present invention is applied outputs an image stored in the memory 10 as a still image by the process of step S15 to the scan converter 2. Thereby, the user can actually confirm an image to be recorded as a still image.

  On the display 4 of the image display device 1, the data is continuously output to the scan converter 2 stored in the memory 10. The user presses the enter key 12 or the like of the remote controller 7 while viewing this image, and instructs the recording of the frame. The control microcomputer 5 outputs a command for causing the recording processing unit 6 to record a still image (step S16).

  The image display device 1 to which the present invention is applied is characterized in that an image stored in the memory 10, that is, an image recorded in the semiconductor memory 15 is displayed on the display 4. As described in step S12 and step S13, a difference of several frames is generated between the image displayed on the display 4 and the image recorded on the semiconductor memory 15 when the still image recording key 11 is pressed. A difference of about several frames is not a big difference as long as the images are continuous, but if there is a scene change between these several frames, the image displayed on the display 4 and the recorded image are completely different. In the case of the image display device 1 to which the present invention is applied, since the image after the scene change is displayed on the display 4, the difference between the operation of the machine and the user's feeling of use can be filled.

  When the recording processing unit 6 inputs a control command in step S16, the recording processing unit 6 starts frame recording processing in accordance with the control command. The recording system of the image display device 1 includes a JPEG encoding unit 13 and a memory driver 14. The recording processing unit 6 first outputs the video signal stored in the memory 10 to the JPEG encoding unit 13. The JPEG encoding unit 13 performs JPEG compression on the input video signal, adds a header to the compressed image data, and generates a JPEG format file. The JPEG encoding unit 13 outputs the generated JPEG file to the memory driver 14. The memory driver 14 records the file in an appropriate folder while communicating with the semiconductor memory 15 (step S17).

  The recording processing unit 6 outputs a message indicating that the recording of the still image has ended to the control microcomputer 5 (step S18). When receiving the message, the control microcomputer 5 outputs a command to the switching circuit 8 (step S19). In response to this command, the switching circuit 8 switches the input destination from the input 2 to the input 1, that is, from the recording processing unit 6 to the input circuit 9 as shown in FIG. 3B (step S20). As a result, the scan converter 2 receives the video signal output from the input circuit 9 and displays it on the display 4. This is a normal image display state (step S21).

  Next, the operation of the above-described image display apparatus 1 will be described with reference to the flowchart of FIG. The image display device 1 waits for an input from the remote controller 7 (step S31). When the still image recording key 11 of the remote controller 7 is pressed, the image display device 1 outputs a command to the switching circuit 8 and the recording processing unit 6. The recording control unit of the image display apparatus 1 captures one frame of the video signal output from the switching circuit 8. The captured video signal is stored in the memory 10 (step S32).

  The recording control unit outputs the frame stored in the memory 10 to the switching circuit 8 (step S33). This frame is output to the scan converter 2 via the switching circuit 8. The scan converter 2 displays the input frame on the display 4.

  When the user instructs recording on the image displayed on the display 4 (step S34; YES), the recording control unit starts recording processing. On the other hand, when the user gives an instruction to stop recording (step S34; NO), the image display process proceeds to step S31, and again waits for an instruction input from the user.

  In the recording process, the recording processing unit 6 first takes in the frame stored in the memory 10 into the processing area (step S35). Then, the recording processing unit 6 instructs the JPEG encoding unit 13 to compress the frame (step S36). The JPEG encoding unit 13 performs JPEG compression on the input frame to generate a JPEG format file (step S37). Next, the recording processing unit 6 outputs a control signal to the memory driver 14 and records the file output from the JPEG encoding unit 13 in the semiconductor memory 15 (step S38).

  As described above, the image display device 1 to which the present invention is applied displays the recording frame stored in the memory 10 on the display 4 so that the user can visually check and record the actually recorded image. Can be instructed.

When the image display device 1 is instructed to record a still image, the image display device 1 stops displaying the image being reproduced and displays the still image on the display. Next, in the image display apparatus 100 shown below , the user is viewing the image being reproduced while the still image is being recorded by simultaneously displaying the image being reproduced and the recorded still image. To prevent important scenes from being overlooked on television .

  FIG. 6 shows a configuration of the image display apparatus 100 that simultaneously displays an image being reproduced and a still image. In the image display device 100, the input and output of the switching circuit 20 are each in two systems. The input of the switching circuit 20 is the input circuit 9 and the recording processing unit 6, and the output includes an output to the scan converter 21 and the recording processing unit 6 and an output to the scan converter 21. The output to the scan converter 21 and the recording processing unit 6 is used for displaying the above-described still image, and the output of only the scan converter 21 is used for continuous output of the reproduced image. Note that portions having no difference in configuration between the image display device 100 and the image display device 100 described above are denoted by the same reference numerals.

  The operation of the image display apparatus 100 will be described with reference to the flowchart of FIG. The image display apparatus 100 waits for an input from the remote controller 7 while reproducing an image. At this time, the output 1 and the output 2 of the switching circuit 20 are connected to the input 1 as shown in FIG. When the still image recording key 11 of the remote controller 7 is pressed, the control microcomputer 5 of the image display device 100 outputs a command to the switching circuit 20 and the recording processing unit 6 (step S41). In response to this command, the recording processing unit 6 stores one frame of the video signal output from the switching circuit 20 in the memory 10 (step S42).

  The recording processing unit 6 outputs the frame stored in the memory 10 to the switching circuit 20 (step S43). At this time, the input 2 is connected to the output 2 as shown in FIG. The scan converter 21 inputs the video signal from the input circuit 9 and the frame stored in the memory 10 (step S44). The scan converter 21 superimposes the video being reproduced input from the input circuit 9 and the still image stored in the memory 10 on the display 4 (step S45). When the user instructs recording on the still image displayed on the display 4 (step S46; YES), the recording control unit starts recording processing. On the other hand, when the user gives an instruction to stop recording (step S46: NO), the image display apparatus 100 shifts the process to step S41, and again waits for an instruction input from the user.

  In the recording process, the recording processing unit 6 first takes a frame stored in the memory 10 into a processing area (step S47). Then, the recording processing unit 6 instructs the JPEG encoding unit 13 to start frame compression (step S48). The JPEG encoding unit 13 performs JPEG compression on the input frame to generate a JPEG format file (step S49). Next, the recording processing unit 6 outputs a control signal to the memory driver 14 and records the file output from the JPEG encoding unit 13 in the semiconductor memory 15 (step S50).

  As described above, since the image display apparatus 100 displays the image being reproduced and the still image to be recorded at the same time, what image is recorded in the semiconductor memory 15 without the user overlooking the image being reproduced. It can be confirmed.

It is a block diagram which shows the structure of an image display apparatus. It is a block diagram which shows the process of a control system. It is a figure which shows the connection relation of a switching circuit. It is a figure which shows the relationship between the flame | frame which a scan converter inputs, and the flame | frame displayed on a display. It is a flowchart explaining operation | movement of an image display apparatus. It is a block diagram which shows the structure of the image display apparatus which reproduces | regenerates the image and still image currently reproduced | regenerated simultaneously. It is a flowchart explaining operation | movement of the image display apparatus shown in FIG. It is a figure which shows the connection relation of a switching circuit. It is a figure which shows the structure of the conventional image display apparatus.

Explanation of symbols

1 image display device, 2 scan converter, 3 frame memory, 4 display, 5 control microcomputer, 6 recording processing unit, 7 remote controller, 8 switching circuit, 9 input circuit, 10 memory, 11 still image recording key, 12 determination key , 13 JPEG encoding unit, 14 memory driver, 15 semiconductor memory

Claims (6)

Video signal input means for inputting a video signal;
An image for performing frequency conversion on the video signal in accordance with the resolution of a predetermined display unit, supplying the video signal subjected to the frequency conversion to the display unit via a frame memory, and displaying an image on the display unit Output means;
Storage means for storing the video signal input by the video signal input means in response to an external still image recording instruction signal ;
Switching means for outputting at least one of the video signal input by the video signal input means or the video signal stored in the storage means to the image output means;
Depending on the still image recording instruction signal from the external, a control signal for controlling the storing operation of the memory means and control means for outputting to the storage means,
When the storage means has received the control signal which the control means has output
The storage means stores a video signal for one frame input by the video signal input means when the control signal is received ,
The switching means outputs the video signal for the one frame stored in the storage means to the image output means,
The image output means performs the frequency conversion on the video signal for one frame output from the switching means, and causes the predetermined display means to display a still image based on the video signal for the one frame. Display device. When the switching means simultaneously outputs the video signal input by the video input means and the video signal for the one frame stored in the storage means to the image output means, the image output means switching means image display apparatus according to claim 1, wherein Ru is displayed simultaneously said display means an image based on both the video signal output to the image output unit. The image output means includes a frequency conversion unit that generates an image in which both video signals output from the switching means having different frames are superimposed,
The image output means, an image display apparatus according to claim 2, wherein the image the frequency converter is generated Ru is displayed on the display means. Said control means, an image of claim 1, wherein that having a recording control unit that controls to convert the one frame of video signal stored in the storage means into a predetermined format is recorded on the recording medium Display device. Still image recording instruction signal from the external includes an instruction signal for recording an image displayed on the display means a video signal of the one frame stored in the storage means to the Symbol recording medium ,
When said control means receives the instruction signal, the recording control unit according to claim 4 wherein said one frame of the video signal stored in the storage means that controls to record into the recording medium Image display device. When the recording control unit finishes the control for recording the video signal for one frame stored in the storage unit on the recording medium, the switching unit inputs the video signal to be output to the image output unit. the original from the storage means switching to the video signal input means, said image output means, the image display apparatus of a video signal inputted from the video signal input unit according to claim 5, wherein you output to the display means.

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