JP2014006318A - Image display device and image display method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress disturbance of display images on a display even when a plurality of images are input.SOLUTION: An image display device comprises: an image information measuring unit 11 for measuring image information that is information for each of frames of input images; a frame memory 16 for storing the input images; an image information comparing unit 13 for comparing a measurement result of the image information measuring unit 11 with an immediately preceding measurement result; a writing control unit 15 for, if comparison results obtained by the image information comparing unit 13 are different, writing an input image in a single memory area where the input image obtained immediately before the different results are generated is not stored, among memory areas in the frame memory 16; a reading control unit 18 for, if the comparison results obtained by the image information comparing unit 13 are different, reading from the frame memory 16 an input image obtained immediately before the different results are generated; and a display 20 for displaying an input image read by the reading control unit 18.

Description

  The present invention relates to an image display apparatus and an image display method that can handle a plurality of types of images.

  Currently, displays such as computer terminals have a wide variety of display positions and display sizes (resolutions) of images on the screen and input images (video signals). For this reason, a highly versatile multi-scan display capable of handling all images with a single display has come to be used. That is, when there is only one resolution of the video input to the display, the resolution conversion adjustment value can be fixed. On the other hand, when a plurality of videos having different resolutions are input, it is necessary to identify the resolution of the video and perform resolution conversion so as to match the resolution of the display device.

  Patent Document 1 discloses an automatic adjustment device for a multi-scan display. In this automatic adjustment apparatus, the horizontal / vertical period of the input video, the start position and the end position of the video display period are measured, and the display size and the display position are calculated from the measurement result so as to match the display timing of the display. This process eliminates the need for a device for adjusting the display size and display position information of the video in the memory and adjustment time, and eliminates the need for manual adjustment by the user even when an unknown video is input.

Japanese Patent Laid-Open No. 05-035240

  In the automatic adjustment device of Patent Document 1, an input image is measured, waits until information such as a horizontal / vertical display position is determined, and after the determination, calculation is performed so as to match the display timing of the display. As for the confirmation condition, information such as the horizontal / vertical display position is fetched at a predetermined interval, and the case where the fetched value is the same as the previous time is regarded as definite. For this reason, when the input video is switched, it takes time to determine and calculate the information of the video after the switching. As a result, a distorted video is displayed until the video after switching is normally displayed on the display.

  For example, as shown in FIG. 6, when a plurality of types of videos A, B, C, and D having different video information (horizontal / vertical synchronization signal period, etc.) are input, the fourth to seventh frames are displayed. Display image is disturbed. Specifically, as shown by a cross in the figure, the display image on the display starts to be disturbed from the fourth frame in which the input image changes from A to B. After the sixth frame, the video D is stable. However, after the input video matches the information of the previous video, the video information is determined and displayed on the display from the determined video. Also, the display image on the display is disturbed for the seventh frame.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a video display device and a video display method capable of suppressing disturbance of a display video on a display even when a plurality of types of video are input. Is to provide.

  In order to solve the above problems, a video display device according to an embodiment of the present invention includes a video information measurement unit that measures video information that is information of each frame of an input video, and a frame memory that stores the input video. And the video information comparison unit that compares the measurement result of the video information measurement unit with the previous measurement result, and the comparison result of the video information comparison unit is inconsistent in the memory area in the frame memory If the comparison result of the writing control unit that writes the input video in a single memory area in which no input video is stored and the video information comparison unit do not match, the input video immediately before the mismatch is read from the frame memory A readout control unit and a display unit for displaying an input video read out by the readout control unit are provided.

  The display unit continues to display the input video before switching until the calculation for properly displaying the input video after switching is completed, and displays the input video after the switching when the calculation is completed. May be.

  A write number determination unit that determines a write number of the frame memory using a comparison result of the video information comparison unit and a write number of one frame before; and the write control unit includes: The input video may be written to the determined writing number.

  A read number determining unit for determining a read number of the frame memory using a comparison result of the video information comparing unit, the number of mismatches of the video information, and a read number of one frame before; The input video may be read from the read number determined by the read number determining unit.

  The frame memory may have a memory area that can store the input video for four frames.

  Further, when comparing the measurement results for N frames, the frame memory may have a memory area capable of storing the input video for N + 2 frames.

  In order to solve the above-described problem, a video display method according to an embodiment of the present invention includes a video information measurement step of measuring video information that is information of each frame of an input video, and a measurement result of the video information measurement step immediately before When the comparison result of the video information comparison step and the comparison result of the video information comparison step does not match, the input video immediately before the mismatch is stored in the memory area in the frame memory for storing the input video. A write control step of writing the input video in a single memory area that is not, and a read control step of reading the input video immediately before the mismatch from the frame memory if the comparison result of the video information comparison step is mismatched, A display step for displaying the input video read by the read control step. And features.

  According to the present invention, it is possible to provide a video display device and a video display method capable of suppressing disturbance of a display video on a display even when a plurality of types of video are input.

It is a block diagram which shows the structural example of the video display apparatus which concerns on embodiment of this invention. It is a block diagram which shows the structural example of the frame memory which concerns on embodiment of this invention. It is a flowchart which shows the operation example of the writing control of the video display apparatus concerning embodiment of this invention. It is a flowchart which shows the operation example of read-out control of the video display apparatus concerning embodiment of this invention. It is a figure for demonstrating the operation example which concerns on embodiment of this invention, Comprising: (a) is an input image | video, (b) is the image | video of each bank of a frame memory, (c) is a display image | video of a display. It is a figure which shows the input image in a prior art, and the display image of a display.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

≪Configuration example≫
FIG. 1 is a configuration diagram illustrating a configuration example of a video display device according to an embodiment of the present invention. This video display device is a device that can handle a plurality of types of video, and as shown in FIG. 1, a video information measurement unit 11, a video information storage unit 12, a video information comparison unit 13, and a writing number determination. Unit 14, write control unit 15, frame memory 16, read number determination unit 17, read control unit 18, display timing deriving unit 19, and display 20. Multiple types of video are videos with different display timings. The display timing includes an image enlargement / reduction ratio, a display position, a horizontal / vertical synchronization signal cycle, and the like.

  The input video is supplied to the video information measuring unit 11 and the writing control unit 15.

  The video information measuring unit 11 measures video information that is information of each frame of the input video. The video information includes the horizontal / vertical synchronization signal, the position and size of the data enable signal, the cycle of the clock signal, and the like.

  The video information storage unit 12 stores the measurement result (video information) of the video information measurement unit 11 for each bank of the frame memory 16 in which the video to be measured is stored. The bank here means a memory area for storing one frame of video, and does not necessarily match the bank terminal of the frame memory 16.

  In the present embodiment, a frame memory 16 having a memory area capable of storing video for four frames is used. Specifically, as shown in FIG. 2, a frame memory 16 having four banks (1) to (4) is used, and one bank is used as a memory area for one frame. The number of banks of the frame memory 16 may be four or more, but the most preferable number is four. When the number of banks is four, the number of video information stored in the video information storage unit 12 may be only four frames.

  The video information comparison unit 13 compares the measurement result of the video information measurement unit 11 with the previous measurement result. That is, the video information of the input video and the previous video is compared to determine whether they match or do not match.

  The write number determination unit 14 determines the write number BW for writing the input video to the frame memory 16 using the comparison result of the video information comparison unit 13 and the write number BW of one frame before.

  The write control unit 15 writes the input video to the write number BW determined by the write number determination unit 14. For example, when the comparison result of the video information comparison unit 13 does not match, the input video is written into a single memory area in the memory area in the frame memory 16 where the input video immediately before the mismatch is not stored. Yes.

  The read number determination unit 17 determines the read number BR for reading the input video from the frame memory 16 using the comparison result of the video information comparison unit 13, the number of mismatches of the video information, and the read number BR one frame before.

  The display timing deriving unit 19 displays the display timing (video enlargement / reduction ratio, display position, horizontal / horizontal) displayed on the display 20 from the video information stored in the readout number BR determined by the readout number determination unit 17. (Vertical synchronization signal cycle) is calculated. When the video information of the video read immediately before and the video information read from now on are the same, the previous display timing may be set as the current display timing without calculation.

  The read control unit 18 reads the video of the read number BR determined by the read number determination unit 17 at the display timing derived by the display timing deriving unit 19 and outputs it to the display 20. For example, when the comparison result of the video information comparison unit 13 does not match, the input video immediately before the mismatch is read from the frame memory 16.

  The display 20 displays the input video read by the read control unit 18. Until the calculation for properly displaying the input video after the switching is completed, the input video before the switching is continuously displayed, and when the calculation is completed, the input video after the switching is displayed.

≪Operation example≫
FIG. 3 is a flowchart showing an example of write control operation of the video display apparatus according to the embodiment of the present invention. FIG. 4 is a flowchart showing an operation example of readout control of the video display apparatus according to the embodiment of the present invention. Examples of these operations will be described with reference to FIG. FIG. 5A shows a case where a plurality of types of input images A, B, C, and D are input. Input videos B and C are distorted videos during switching when switching from input video A to D. FIG. 5B shows an image of each bank of the frame memory. A thick frame in FIG. 5B means that the same input video is displayed. FIG. 5C shows a display image on the display 20.

  The operation of the display 20 after the power is turned on (step 01) is as follows.

(A) When video of the first frame is input (a) Write control First, measurement of video information of the input video (first frame) is started (step 02). Specifically, the video information includes a horizontal / vertical synchronization signal, a clock signal cycle, and a position and size of a data enable signal.

  Next, the write number BW of the frame memory 16 is incremented, for example, in the order of BW = (1) → (2) → (3) → (4) → (1) →... (Step 03). After (4), return to (1). (1) to (4) are banks (1) to (4). Here, since it is the first frame, the write number BW = (1).

  Next, the input video is written to the write number BW of the frame memory 16 (step 04). Here, since the write number BW = (1), the input video is written into the bank (1) of the frame memory 16.

  Next, it is determined whether the input video and the previous video have the same measurement result or there is no previous measurement result (step 05). Here, since it is the first frame, it is determined that there is no previous measurement result.

  The process proceeds to the next frame (second frame) below.

(B) Reading control It is determined whether or not video of two frames or more has been stored in the frame memory 16 (step 11). Here, since the input of the first frame of video is started, the video of more than two frames is not yet stored in the frame memory 16, and therefore the read control is not executed.

(B) When video of second frame is input (a) Write control Measurement of video information of input video (second frame) is started (step 02). The write number BW of the frame memory 16 is (1) +1 and BW = (2) (step 03). The input video is written into the bank (2) of the frame memory 16 (step 04). It is determined that the measurement results of the present (second frame) and the previous one (first frame) are the same (step 05). The process proceeds to the following next frame (third frame).

(B) Read Control At the time when the input of the second frame video is started, the video is not stored in the frame memory 16 yet, so the read control is not executed (step 11).

(C) When video of third frame is input (a) Write control Measurement of video information of input video (third frame) is started (step 02). The write number BW of the frame memory 16 is (2) +1 and BW = (3) (step 03). The input video is written into the bank (3) of the frame memory 16 (step 04). It is determined that the measurement results of the present (third frame) and the previous (second frame) are the same (step 05). The process proceeds to the following next frame (fourth frame).

(B) Read control First, the read number BR of the frame memory 16 is incremented in the order of, for example, BR = (1) → (2) → (3) → (4) → (1) →. After (4), return to (1). Here, since it is the first reading, the reading number BR = (1) (step 12).

  Next, the display timing of the display 20 is calculated based on the video information of the video having the readout number BR (step 13). Here, the display timing of the display 20 is calculated based on the measurement result of the first frame (video enlargement / reduction ratio, display position, horizontal / vertical synchronization signal cycle). If the measurement result of the video of the immediately preceding read number BR and the video of the current read number BR are the same, the immediately preceding display timing may be set as the current display timing without calculation.

  Next, from the read number BR of the frame memory 16, step. The video is read at the display timing of 13 (step 14). Here, the video of the first frame is read from the bank (1).

  Next, the read video is displayed on the display 20 (step 15). Here, the first frame image is displayed.

  Next, it is determined whether the input video and the previous video have the same measurement result or there is no previous measurement result (step 05). This step is a step of writing control step. This is the same as 05. Here, it is determined that the measurement results of the present (third frame) and the previous (second frame) are the same.

  Next, it is determined whether or not the measurement results of the previous video and the previous video are the same (step 217). Here, it is determined that the measurement results of the video immediately before (second frame) and two previous (first frame) are the same.

  The process proceeds to the following next frame (fourth frame).

(D) When the fourth frame video is input (a) Write control Measurement of video information of the input video (fourth frame) is started (step 02). The write number BW of the frame memory 16 is (3) +1 and BW = (4) (step 03). The input video is written into the bank (4) of the frame memory 16 (step 04). It is determined that the measurement results of the present (fourth frame) and the previous one (third frame) are different (step 05). In this case, the write number BW of the frame memory 16 is returned to the previous one (step 206). Here, the write number BW is (4) -1 and BW = (3). The process proceeds to the following next frame (fifth frame).

(B) Read Control The read number BR of the frame memory 16 is (1) +1 and BR = (2) (step 12). The display timing of the display 20 is calculated based on the measurement result of the second frame (step 13). Since the second frame has the same measurement result as the first frame, the display timing of the first frame may be used without calculation. The video of the second frame is read from the bank (2) of the frame memory 16 (step 14). The second frame image is displayed on the display 20 (step 15). It is determined that the measurement results of the present (fourth frame) and the previous one (third frame) are different (step 05). Here, if the number of mismatches is one, the read number BR is left as it is, and if the number of mismatches is two or more, the read number BR is returned to the previous one (step 216). The number of mismatches is the number of times that the video information is determined to be mismatched, that is, the number of times that the measurement results are determined to be different. If the mismatch is interrupted (matched), the number of mismatches is reset to zero. Here, since the number of mismatches is one, the read number BR of the frame memory 16 becomes BR = (2) as it is. The process proceeds to the following next frame (fifth frame).

(E) When video of the fifth frame is input (a) Write control Measurement of video information of the input video (fifth frame) is started (step 02). The write number BW of the frame memory 16 is (3) +1 and BW = (4) (step 03). The input video is written into the bank (4) of the frame memory 16 (step 04). By these operations, the video is overwritten in the bank (4) of the frame memory 16 while the video information of the input video and the previous video does not match. It is determined that the measurement results of the present (5th frame) and the previous (4th frame) are different (step 05). The write number BW of the frame memory 16 is (4) -1 and BW = (3) (step 206). The process proceeds to the following next frame (sixth frame).

(B) Read Control The read number BR of the frame memory 16 is (2) +1 and BR = (3) (step 12). The display timing of the display 20 is calculated based on the measurement result of the third frame (step 13). The video of the third frame is read from the bank (3) of the frame memory 16 (step 14). The third frame image is displayed on the display 20 (step 15). It is determined that the measurement results of the present (5th frame) and the previous (4th frame) are different (step 05). Since the number of mismatches is 2, the read number BR of the frame memory 16 is (3) -1 and BR = (2) (step 216). The process proceeds to the following next frame (sixth frame).

(F) When video of 6th frame is input (a) Write control Measurement of video information of input video (6th frame) is started (step 02). The write number BW of the frame memory 16 is (3) +1 and BW = (4) (step 03). The input video is written into the bank (4) of the frame memory 16 (step 04). It is determined that the measurement result of the present (sixth frame) and the previous one (fifth frame) are different (step 05). The write number BW of the frame memory 16 is (4) -1 and BW = (3) (step 206). The process proceeds to the following next frame (seventh frame).

(B) Read Control The read number BR of the frame memory 16 is (2) +1 and BR = (3) (step 12). The display timing of the display 20 is calculated based on the measurement result of the third frame (step 13). The video of the third frame is read from the bank (3) of the frame memory 16 (step 14). The third frame image is displayed on the display 20 (step 15). By these operations, while the video information of the input video and the previous video does not match, the video immediately before the mismatch (third frame) is continuously displayed on the display 20. It is determined that the measurement result of the present (sixth frame) and the previous one (fifth frame) are different (step 05). Since the number of mismatches is 3, the read number BR of the frame memory 16 is (3) -1 and BR = (2) (step 216). The process proceeds to the following next frame (seventh frame).

(G) When video of seventh frame is input (a) Write control Measurement of video information of input video (seventh frame) is started (step 02). The write number BW of the frame memory 16 is (3) +1 and BW = (4) (step 03). The input video is written into the bank (4) of the frame memory 16 (step 04). It is determined that the measurement results of the present (seventh frame) and the previous one (sixth frame) are the same (step 05). The process proceeds to the next frame (eighth frame) described below.

(B) Read Control The read number BR of the frame memory 16 is (2) +1 and BR = (3) (step 12). The display timing of the display 20 is calculated based on the measurement result of the third frame (step 13). The video of the third frame is read from the bank (3) of the frame memory 16 (step 14). The third frame image is displayed on the display 20 (step 15). It is determined that the measurement results of the present (seventh frame) and the previous one (sixth frame) are the same (step 05). It is determined that the measurement results of the previous one (sixth frame) and the second previous (fifth frame) video are different (step 217). In this case, the read number BR of the frame memory 16 is returned to the previous one (step 218). Here, the read number BR is (3) -1 and BR = (2). The process proceeds to the next frame (eighth frame) described below.

(H) When video of 8th frame is input (a) Write control Measurement of video information of input video (8th frame) is started (step 02). The write number BW of the frame memory 16 returns to (1) when 1 is added to (4), so BW = (1) (step 03). The input video is written into the bank (1) of the frame memory 16 (step 04). It is determined that the measurement results of the present (8th frame) and the previous (7th frame) are the same (step 05). The process proceeds to the following next frame (9th frame).

(B) Read Control The read number BR of the frame memory 16 is (2) +1 and BR = (3) (step 12). The display timing of the display 20 is calculated based on the measurement result of the third frame (step 13). The video of the third frame is read from the bank (3) of the frame memory 16 (step 14). The third frame image is displayed on the display 20 (step 15). It is determined that the measurement results of the present (8th frame) and the previous (7th frame) are the same (step 05). It is determined that the measurement results of the previous one (seventh frame) and the second previous (sixth frame) are the same (step 217). The process proceeds to the following next frame (9th frame).

(I) When the 9th frame video is input (a) Write control Measurement of video information of the input video (9th frame) is started (step 02). The write number BW of the frame memory 16 is (1) +1 and BW = (2) (step 03). The input video is written into the bank (2) of the frame memory 16 (step 04). It is determined that the measurement results of the present (9th frame) and the previous (eighth frame) are the same (step 05). Move on to processing of the next frame.

(B) Read Control The read number BR of the frame memory 16 is (3) +1 and BR = (4) (step 12). Since the video of the seventh frame is stored in the bank (4), the display timing of the display 20 is calculated based on the measurement result of the seventh frame (step 13). The video of the seventh frame is read from the bank (4) of the frame memory 16 (step 14). The seventh frame image is displayed on the display 20 (step 15). As a result of these operations, when the input video matches the previous video, the state immediately before the mismatched video is repeatedly displayed on the display 20 returns to a state where a new video is displayed. It is determined that the measurement results of the present (9th frame) and the previous (eighth frame) are the same (step 05). It is determined that the measurement results of the previous one (8th frame) and the second previous (7th frame) video are the same (step 217). Move on to processing of the next frame.

  As described above, in the video display device according to the embodiment of the present invention, when the measurement result of the input video does not match the previous measurement result, the input video A immediately before the mismatch is displayed on the display 20. . Thereby, the disturbed images B and C in the middle of switching when switching from the input image A to D are not displayed on the display 20, so that the disturbance of the display image on the display 20 can be suppressed.

  When the measurement result of the input video does not match the previous measurement result, the memory area in the frame memory 16 is stored in a single memory area in which the input video immediately before the mismatch is not stored, for example, the bank (4). The input video is written (overwritten). Thereby, it is possible to suppress disturbance of the display image on the display 20 with simple control.

  Further, until the calculation for properly displaying the input video D after switching is completed, the input video A before switching is continuously displayed on the display 20, and when the calculation is completed, the input video D after switching is displayed. 20 is displayed. Thereby, the input video D after switching can be displayed on the display 20 at an appropriate timing.

  Note that step. Of the flowchart shown in FIG. 05, step. Of the flowchart shown in FIG. In 217, the video information of two frames is compared to determine whether or not the video information is the same, but the present invention is not limited to this. That is, three or more frames of video information may be compared to determine whether all the video information is the same. However, when comparing video information of three or more frames, since the determination of whether the video information is the same is delayed by the number of added frames, the number of banks of the frame memory 16 is increased by the number of added frames. increase. That is, when comparing video information (measurement results) for N frames, the number of banks in the frame memory 16 is set to N + 2. In this case, the basic idea is the same. The write number BW and the read number BR are in the order of (1) → (2) → (3) → (4) →... → (N) → (N + 1) → (N + 2) → (1) →. Just increment it.

  In addition, the present invention can be realized not only as a video display device, but also as a video display method that uses a characteristic processing unit included in such a video display device as a step, or executes these steps in a computer. It can also be realized as a program to be executed. It goes without saying that such a program can be distributed via a recording medium such as a CD-ROM or a transmission medium such as the Internet.

DESCRIPTION OF SYMBOLS 11 ... Video information measurement part 12 ... Video information storage part 13 ... Video information comparison part 14 ... Write number determination part 15 ... Write control part 16 ... Frame memory 17 ... Read number determination part 18 ... Read control part 19 ... Display timing derivation part 20 ... Display (display part)
(1) to (4) ... Bank BW ... Write number BR ... Read number

Claims (7)

A video information measuring unit that measures video information that is information of each frame of the input video;
A frame memory for storing the input video;
A video information comparison unit that compares the measurement result of the video information measurement unit with the previous measurement result;
If the comparison result of the video information comparison unit does not match, a write control unit that writes the input video to a single memory area in which the input video immediately before the mismatch is not stored among the memory areas in the frame memory;
When the comparison result of the video information comparison unit does not match, a read control unit that reads the input video immediately before the mismatch from the frame memory,
And a display unit that displays the input video read by the readout control unit.   The display unit continues to display the input video before switching until the calculation for appropriately displaying the input video after switching is completed, and displays the input video after the switching when the calculation is completed. The video display device according to claim 1. Using a comparison result of the video information comparison unit and a write number of the previous frame, a write number determination unit that determines a write number of the frame memory;
The video display device according to claim 2, wherein the write control unit writes the input video to a write number determined by the write number determination unit. Using a comparison result of the video information comparison unit, the number of mismatches of the video information, and a read number of the previous frame, and a read number determination unit that determines a read number of the frame memory;
The video display device according to claim 2, wherein the read control unit reads the input video from a read number determined by the read number determination unit.   5. The video display device according to claim 1, wherein the frame memory has a memory area capable of storing the input video for four frames. 6.   6. The video display device according to claim 5, wherein, when the measurement results are compared for N frames, the frame memory has a memory area capable of storing the input video for N + 2 frames. . A video information measuring step for measuring video information that is information of each frame of the input video;
A video information comparison step for comparing the measurement result of the video information measurement step with the previous measurement result;
If the comparison result of the video information comparison step does not match, the input video is stored in a single memory area in which the input video immediately before the mismatch is not stored among the memory areas in the frame memory for storing the input video. Write control step to write,
If the comparison result of the video information comparison step does not match, the read control step of reading the input video immediately before the mismatch from the frame memory,
And a display step for displaying the input video read out in the readout control step.

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