JP3118321B2 - Image enlargement display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an enlarged image display apparatus for enlarging an image signal input from an image source and dividing and displaying an enlarged image on a multi-screen composed of a plurality of monitors.

[0002]

2. Description of the Related Art A method of dividing and displaying an enlarged image on multiple screens includes a method of using a plurality of image sources having the same image format and switching or enlarging the image source to dynamically expand the screen. The method is broadly divided into a method of enlarging a video signal from a high-quality video source such as a high-definition video image while maintaining a high image quality and developing a static screen. In any of the methods, the format of the video source to be input is fixed, and format conversion processing is performed in advance for video sources having different formats. Therefore, an internal processing method and an output method suitable for a certain video format in the video enlarged display device are generally determined uniquely.

[0003]

However, in the case of an image such as computer graphics created by a computer, the video format differs depending on the created conditions, conditions, and the like. In the case where images having various video formats are input as video signals as described above, if all the horizontal and vertical interpolation processes are performed in consideration of the aspect ratio of the input image and the output image, the processing is enormous. There is a problem that it becomes complicated.

[0004] The present invention has been made in view of the above circumstances, and it is possible to determine the video format of a video source having a variety of video formats and select an optimal internal process, thereby providing an effective screen. It is an object of the present invention to provide a video enlarged display device that can be developed.

[0005]

According to a first aspect of the present invention, an enlarged image display apparatus displays an enlarged image corresponding to an image signal input from an image source on a multi-screen composed of a plurality of monitors. In the image enlargement display device, means for knowing the format information of the input source video source, means for determining the output method of the video signal from the monitor configuration when divided and displayed on multiple screens, and detectable from the format information of the video source The difference between the number of lines and the number of dots between the detectable input image and the defined output image is determined by comparing the configurations of the input image and the output image defined by the output method. A process of setting an effective range when the value is equal to or less than a predetermined value, and a process of compressing an input video signal when the number of input images is larger and the ratio of the difference is larger than a predetermined value. Ratio of the difference many people in the output image is characterized in that a means for performing a combination of a process for expanding a video signal is input is greater than a predetermined value.

According to a second aspect of the present invention, in the first aspect of the present invention, the means for knowing the format information includes a table holding format information of a plurality of video sources. The same video source is selected from the table based on the synchronization signal, and the format information of the video source to be input is known.

[0007]

According to the first aspect of the present invention, the format of the video source to be input is determined, and the input image configuration that can be known from this format and the output image defined based on the multi-screen monitor configuration. , The difference between the number of lines and the difference between the numbers of dots in the two image configurations are obtained, and the processing for the input video signal is selected according to the obtained differences. If the ratio of these differences is equal to or less than a predetermined value, the effective range is set without performing any special processing on the input video signal. When the number of lines and dots in the input image is large and the ratio of these differences exceeds a predetermined value, the input video signal is compressed at a predetermined compression ratio. On the other hand, if the number of lines and dots in the output image is large and the ratio of these differences exceeds a predetermined value,
The input video signal is subjected to interpolation processing using a filter. As described above, in the present invention, the optimal internal processing is selected according to the configuration comparison result of the input image and the output image.
Higher efficiency for video sources and multi-screen monitor configurations.

In the video enlargement display device of the second invention, the format information of the video source to be input is known by referring to a table holding format information of a plurality of video sources in advance. Therefore, the format information is determined in a short time.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be specifically described with reference to the drawings showing the embodiments.

FIG. 1 is a block diagram showing the configuration of an image enlargement display device according to the present invention. In FIG. 1, reference numeral 1 denotes an input video judging circuit to which a horizontal synchronizing signal and a vertical synchronizing signal generated according to an input video signal are inputted. The synchronization signal information is read from the video source table 2 which stores the format information (synchronization signal information, aspect ratio, number of dots, number of lines, etc.) of the video source, and the same video source as the input one is searched for. The format information of the searched video source is read, and the read format information is sent to the processing condition generating circuit 4. The processing condition generation circuit 4 compares the configuration of the input image based on the input format information with the configuration of the output image based on the output image information from the output image configuration table 3, and based on the comparison result, determines the input system. A control signal is output to a PLL 5, an output system PLL 6, a frequency conversion circuit 8, a reduction filter 9, and an expansion filter 10, and internal processing is performed on an input video signal. The reduction filter 9 includes a horizontal filter and a vertical filter that perform compression processing (thinning processing) in the horizontal direction and the vertical direction, respectively.
Is composed of a horizontal filter and a vertical filter that perform expansion processing (interpolation processing) in each of the horizontal direction and the vertical direction. A frequency conversion circuit 8, a reduction filter 9, and an expansion filter 10 are arranged in this order in series from the upstream side. An A / D converter for converting an input analog video signal into a digital signal is provided upstream of the frequency conversion circuit 8. 7 is the expansion filter 10
D / which converts the output of the enlargement filter 10 to analog
A converter 11 is provided, and the input video signal is subjected to horizontal and / or vertical compression processing if necessary.
Interpolation processing is performed. Reference numeral 12 denotes a sampling clock table having various sampling clocks read out to the processing condition generation circuit 4 as necessary.

Next, the operation will be described.

When a video signal from a video source and its synchronizing signal are input, a horizontal synchronizing signal and a vertical synchronizing signal are generated by the synchronizing separation, and these generated synchronizing signals are input to an input video judging circuit 1. Is done. In the input video judging circuit 1, these synchronizing signals and the video source table 2
, The same video source as the input one is searched for, and the format information of the searched video source is read out from the video source table 2 and sent to the processing condition generating circuit 4. . Output image information from the output image configuration table 3 is input to the processing condition generation circuit 4. Then, the processing condition generating circuit 4
In the configuration of input image and output image (aspect ratio,
The number of dots, the number of lines, etc.) are compared, and based on the comparison result, the effective line range. The effective dot range is determined,
It is determined whether horizontal filtering processing or vertical filtering processing is necessary. The processing operation in the processing condition generation circuit 4 will be described later in detail. And input system
A control signal corresponding to the processing operation result of the processing condition generation circuit 4 is output to the PLL 5, the output system PLL 6, the frequency conversion circuit 8, the reduction filter 9, and the expansion filter 10.

Next, the processing operation of the processing condition generating circuit 4 which is a feature of the present invention will be described.

FIGS. 2 and 3 are flowcharts showing the procedure of one processing operation of the processing condition generation circuit 4. FIG. Figures 2 and 3
In the processing operation shown in (1), first, the number of effective output lines or the number of effective output dots is assumed by comparing the aspect ratios of the input image and the output image, then the effective line range is determined, and the vertical interpolation coefficient is determined. The range and the horizontal interpolation coefficient are determined.

First, the number of input lines and aspect ratio of an input image and the number of output lines and aspect ratio of an output image are input (step S1), and the aspect ratios of both images are compared (step S2). If the output image is longer than the input image, the number of effective output lines is determined (step S3),
If the output image is wider than the input image, the number of effective output dots is determined (step S4). Next, the number of input lines is compared with the number of valid output lines (step S5). If the number of input lines is smaller than the number of valid output lines, it is determined whether or not the difference in the number of lines is within 10%. (Step S6). If it is within 10%, the effective output line range is determined (step S7), and the process proceeds to step S8. If the difference in the number of lines exceeds 10%, the filter coefficient of the vertical filter for performing the interpolation process in the vertical direction is calculated (the number of input lines is changed) (step S9), and the calculation is performed based on the calculated filter coefficient. A valid output line range or a valid input line range is determined (step S10), and the process proceeds to step S8. If the number of input lines is equal to or greater than the number of valid output lines in step S5, it is determined whether or not the difference in the number of lines is within 10% (step S11). If it is within 10%, determine the valid input line range (step
S12), and proceed to step S8. If the line number difference exceeds 10%, the number of input lines is reduced to 1/2 or 1/3 (step S13), and the process returns to step S5.

In step S8, the number of input dots of the input image is input. Next, the number of input dots is compared with the number of valid output dots (step S14). If the number of input dots is smaller than the number of valid output dots, it is determined whether or not the difference in the number of dots is within 10%. (Step S15). If it is within 10%, the effective output dot range is determined (step S1).
6), end the process. If the difference in the number of dots exceeds 10%, the filter coefficient of the horizontal filter for performing the interpolation process in the horizontal direction is calculated (the number of input dots is changed) (step S17), and based on the calculated filter coefficient. The valid output dot range or the valid input dot range is determined (step S18), and the process ends. In step S14,
If the number of input dots is greater than or equal to the number of effective output dots,
It is determined whether or not the dot number difference is within 10% (step S19). If it is within 10%, the valid input dot range is determined (step S20), and the process ends. If the difference in the number of dots exceeds 10%, the number of input dots is compressed to 1/2 or 1/3 (step S21), and the process returns to step S14.

FIGS. 4 and 5 are flowcharts showing the procedure of another processing operation of the processing condition generating circuit 4. In the processing operation shown in FIGS. 4 and 5, first, the number of lines is determined, an output sampling clock is calculated according to the aspect ratio of the input image, and a clock which is the same as or close to the calculated one is sampled. , And the effective dot range and the horizontal interpolation coefficient are determined accordingly.

First, the number of input lines of an input image and the number of output lines of an output image are input (step S31). Next, the number of input lines and the number of output lines are compared (step S32),
If the number of input lines is smaller than the number of output lines, it is determined whether or not the difference in the number of lines is within 10% (step S33). If it is within 10%, the effective output line range is determined (step S34), and the process proceeds to step S35. If the difference in the number of lines exceeds 10%, the filter coefficient of the vertical filter for performing the interpolation process in the vertical direction is calculated (the number of input lines is changed) (step S36), and based on the calculated filter coefficient. The valid output line range or the valid input line range is determined (step S37), and step S35
Proceed to. If the number of input lines is equal to or greater than the number of output lines in step S32, it is determined whether or not the difference in the number of lines is within 10% (step S38). If it is within 10%, determine the valid input line range (step
S39), and proceed to step S35. If the difference between the numbers of lines exceeds 10%, the number of input lines is reduced to 1/2 or 1/3 (step S40), and the process returns to step S32.

In step S35, the aspect ratio of the input image and the number of output dots of the output image are input. Next, a horizontal sampling clock that matches the input aspect ratio is calculated (step S41), and it is determined whether the calculated clock can be created (step S42). If it can be created, the process ends. If the clock cannot be created, a clock that can be created near the clock calculated by selecting a number of dots smaller than the number of output dots is selected (step S43). As a result, the number of input dots of the input image is determined. 10% difference between the number of input dots and the number of output dots
It is determined whether it is within the range (step S44). If it is within 10%, the effective output dot range is determined (step S45), and the process ends. If the difference in the number of dots exceeds 10%, the filter coefficient of the horizontal filter for performing the horizontal interpolation processing is calculated (the number of input dots is changed) (step S46), and based on the calculated filter coefficient. The valid output dot range or the valid input dot range is determined (step S47), and the process ends.

[0020]

As described above, in the video enlarged display device of the first invention, the format of the input image which can be detected from various input video sources having different formats, the format of the input image which can be detected from the format, and the multi-screen can be detected. By comparing with the configuration of the output image defined from the monitor configuration and selecting the optimal internal processing according to the comparison result, it is possible to achieve more effective screen development of the enlarged image. is there.

Further, in the second invention, when the video source to be input is determined, a table holding format information of a plurality of video sources is referred to in advance, so that the format of the video source can be easily changed in a short time. Can be determined.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a video enlarged display device according to the present invention.

FIG. 2 is a flowchart illustrating an example of a processing operation in the processing condition generation circuit of FIG. 1;

FIG. 3 is a flowchart illustrating an example of a processing operation in the processing condition generation circuit of FIG. 1;

FIG. 4 is a flowchart illustrating another example of the processing operation in the processing condition generation circuit of FIG. 1;

FIG. 5 is a flowchart illustrating another example of the processing operation in the processing condition generation circuit of FIG. 1;

[Explanation of symbols]

 Reference Signs List 1 input video judgment circuit 2 video source table 3 output image configuration table 4 processing condition generation circuit 8 frequency conversion circuit 9 reduction filter 10 expansion filter

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-181773 (JP, A) JP-A-3-174187 (JP, A) JP-A-3-280084 (JP, A) 26192 (JP, A) JP-A-5-145866 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G09G 5/00 G09G 5/377 H04N 5/66 H04N 5/68

Claims (2)

(57) [Claims] 1. A video magnifying display device for displaying an enlarged video according to a video signal input from a video source on a multi-screen composed of a plurality of monitors, wherein the format information of the input source video source is known. And a means for determining a video signal output method based on a monitor configuration when divided and displayed on multiple screens, and a configuration of an input image detectable from format information of a video source and an output image defined by an output method. Then, a line number difference and a dot number difference between the detectable input image and the defined output image are obtained, and when the ratio of the difference is equal to or less than a predetermined value, processing for setting an effective range is performed. A process of compressing an input video signal when the number of images is larger and the ratio of the difference is larger than a predetermined value; and a process of compressing the input video signal when the number of images is larger and the ratio of the difference is larger than a predetermined value. Image enlargement display device characterized by comprising a means for performing a combination of a process for expanding a video signal is input. The means for knowing the format information has a table holding format information of a plurality of video sources, and selects the same video source from the table based on a synchronization signal of an input video signal. 2. The enlarged video display device according to claim 1, wherein the format information of the input source video source is known.