JP2001103340A - Contour emphasis circuit for display device displaying a plurality of video images - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a border between video images from being unnatural by applying contour emphasis to each video image when a display devices display displaying a plurality of images whose counter is emphasized. SOLUTION: The display device that writes video data of a plurality of video images with no correlation to different areas in a memory, reads the video data written in one memory area and displays the data on a display section 44, is provided with a border control signal generating section 54, a contour detection section 12, a 1st adder section 14 and a 1st selector 56. The border control signal generating section 54 generates a control signal CS denoting whether or not a video image is border of a plurality of video images, the 1st selector 56 selects video data before receiving addition of any contour emphasis component by the 1st adder section 14 to the display section 44 when the control signal is at an H level so as not to apply the contour emphasis processing to the border or the 1st selector 56 selects video data after receiving addition of any contour emphasis component to the display section 44 when the control signal it at an L level so as to apply the contour emphasis processing to the border.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for writing video data of a plurality of uncorrelated images to different areas in a memory, and storing the plurality of video data written in the memory in one memory area. The present invention relates to an outline emphasizing circuit used in a multi-image display device that reads out written image data and displays a plurality of images on a display unit. For example,
A display device such as a multi-channel application that simultaneously displays a plurality of images (also referred to as a multi-screen display device)
The present invention relates to a contour emphasis circuit used in the above.

[0002]

2. Description of the Related Art As a thin and lightweight display device,
PDP using PDP (plasma display panel)
Attention has been focused on display devices and LCD display devices using LCD (liquid crystal display) panels. Such a display device is a direct drive system using digitized video signals (video data), and conventionally uses a contour emphasizing circuit 10 as shown in FIG. .

The contour emphasizing circuit 10 includes a contour detecting section 12 for detecting a contour emphasizing component based on input video data,
The detected contour emphasis component is added to the input video data, and the
Image data with contour enhancement on a display device (not shown) such as P
And a first adder 14 that outputs the data.
The contour detection unit 12 is a D-type flip-flop (hereinafter simply referred to as D-FF) 1 as an example of a delay unit that sequentially delays input video data by one pixel (for example, one dot).
6, 18, 20, 22; input video data and D-FF1
6, a selector 24 for switching and outputting the video data output from the D-FF 20;
A selector 26 for switching and outputting the video data output from the FF 22; and multipliers 28 and 30 for multiplying the video data output from the selectors 24 and 26 by a factor of ４.
And a multiplier 32 for multiplying the video data output from the D-FF 18 by a factor of 1/2, and a second adder for adding the operation values of the multipliers 28, 30, and 32 to calculate an outline emphasis component. 3
4 and an externally set enhancement amount selection signal K.
At S (H, L level signals), the selectors 24 and 26 are switched between a solid line connection state and a dotted line connection state to switch the emphasis amount.

[0004] Video data of a plurality of images having no correlation is written in different areas in a memory, and the plurality of video data written in the memory is used as video data written in one memory area. When a contour emphasizing circuit 10 as shown in FIG. 11 is used in a display device for reading and displaying a plurality of images P1 to P12 as shown in FIG. 12 on a PDP display unit, a circuit configuration as shown in FIG. That is, the input selection circuit 36, the write processing circuit 38, the memory 4
0, read processing circuit 42, contour emphasis circuit 10, and PDP
The video data V1 to V12 corresponding to the plurality of uncorrelated videos P1 to P12 are selected at a predetermined timing by the input selection circuit 36, and the video data selected by the writing processing circuit 38. −ta V1 to V12
Are written in different areas in the memory 40, the read processing circuit 42 reads the video data using the memory 40 as one memory area (memory space), and the video data read by the contour enhancement circuit 10. The contour enhancement process is performed on the data, and a plurality of images P1 to P12 as shown in FIG.

[0005]

However, FIG.
In the circuit shown in FIG. 7, since the contour enhancement processing by the contour enhancement circuit 10 is processing for the entire display image on the PDP display unit 44, a boundary BR (for example, P
1 and P2, P2 and P3, ..., boundary B between P11 and P12
R) is determined to be a contour, and a contour enhancement process is performed.
There was a problem that the border and the vicinity of the border seemed unnatural.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems. When an outline emphasis screen is displayed on a multi-image display device, predetermined outline emphasis can be performed on each of a plurality of images, and a correlation can be obtained. It is an object of the present invention to provide a contour emphasizing circuit which can prevent unnatural images from appearing unnaturally at boundaries between the images.

[0007]

SUMMARY OF THE INVENTION An outline emphasis circuit according to the present invention writes video data of a plurality of uncorrelated images in different areas in a memory, and writes the plurality of video data written in the memory. Is read as video data written in one memory area, and a plurality of videos are displayed on a display unit. In a multiple video display device, whether or not a boundary between a plurality of videos is determined based on a synchronization signal, a clock, and setting data. A boundary control signal generator for generating a control signal CS shown in FIG. 2, a contour detector for detecting a contour emphasis component from video data read from the memory, and a video for which the contour emphasis component detected by the contour detector is read from the memory. The first adder adds a contour emphasizing component according to the control signal CS generated by the first adder which outputs the video data which is added to the data and the edge is enhanced. Video data of - characterized in that it comprises a first selector for outputting to the display unit side by switching between the data - data and the first image data of after the edge enhancement component is added by the adding unit. In such a configuration, at the boundary between video images, the control signal CS becomes a signal (for example, H level) indicating that the video signal is a boundary, and the video data before the outline emphasis component is added by the first adding unit is obtained. Since the output is output to the display unit side by the first selector, the outline emphasis processing is not performed. Also,
For the video other than the boundary, the control signal CS becomes a signal indicating that it is not a boundary (for example, L level), and the video data after the outline emphasis component is added by the first adder is sent to the display by the first selector. Since the output is performed, a predetermined contour enhancement process is performed.

In order to prevent the boundary between the plurality of images and the vicinity of the boundary from appearing unnatural, a boundary control signal generation unit generates a control signal CS indicating whether or not the boundary exists and a control signal CSS indicating whether or not the boundary exists. In accordance with the control signal CS, the video data before the outline enhancement component is added by the first addition unit and the video data after the outline enhancement component is added by the first addition unit are output. A second selector is provided in the contour detection unit for switching to one selector and outputting the same to the display unit side, and for switching the contour emphasis component detected by the contour detection unit between weak and strong in response to the control signal CSS.

In order to enable horizontal and vertical contour emphasis processing and to prevent a boundary between horizontal and vertical images (or a boundary and the vicinity thereof) from appearing unnatural, a contour detection unit is provided. A horizontal contour detector for detecting a horizontal contour enhancement component from video data read from the memory, and a vertical contour detector for detecting a vertical contour enhancement component from the video data read from the memory. I do.

A contour emphasizing circuit according to the present invention writes video data of a plurality of uncorrelated videos in different areas in a memory, and stores the plurality of video data written in the memory in one memory area. In a multiple video display device that reads out as written video data and displays a plurality of video images on a display unit, generates a control signal CS indicating whether or not a boundary between the plurality of video images based on a synchronization signal, a clock, and setting data. A boundary control signal generator, a contour detector for detecting a contour emphasis component from video data read from the memory, and a contour emphasis component detected by the contour detector are added to the video data read from the memory. A first adder for outputting image data with contour emphasis, wherein the contour detector multiplies the image data of the target pixel and the image data of the adjacent pixels on both sides thereof by a coefficient less than 1 and outputs the result. Horn A variable number type multiplier, a second adder for adding data output from these multipliers and outputting as a contour enhancement component, and three control signals CS generated by a boundary control signal generator. The multiplier coefficient is set to 0, K1 to K
3 (K1 to K3 are setting values other than 0). In such a configuration, at the boundary between the images, the control signal CS becomes a signal (for example, H level) indicating the boundary, and the multiplication coefficient switching unit switches the coefficients of the three multipliers in the contour detection unit to 0. Therefore, the contour enhancement component output from the contour detection unit becomes 0, and the contour enhancement processing is not performed.
In addition, for the video other than the boundary, the control signal CS becomes a signal indicating that it is not a boundary (for example, L level), and the multiplication coefficient switching means sets the coefficients of the three multipliers in the contour detection unit to K1 to K1.
Since the mode is switched to K3, the contour emphasis component detected by the contour detection unit is added to the video data from the memory, and a predetermined contour emphasis process is performed for each of the plurality of videos.

In order to enable horizontal and vertical contour emphasis processing and to prevent a boundary between horizontal and vertical images from looking unnatural, a multiplier is provided with a target pixel and both sides in the horizontal direction. And a horizontal multiplier for multiplying the video data of the pixel adjacent to the pixel by a coefficient less than 1 and outputting the result, and multiplying the video data of the pixel adjacent to the target pixel and both sides in the vertical direction by a coefficient of less than 1. A second adder for adding the data output from the horizontal multiplier and outputting the result as a horizontal edge enhancement component; and a vertical multiplier. And a vertical adder for adding data output from the adder and outputting the added data as a vertical contour enhancement component. The multiplication coefficient switching means is provided in accordance with the control signal CS generated by the boundary control signal generator. The coefficient of the horizontal multiplier is 0, K
1h to K3h (K1h to K3h are set values other than 0), and the coefficient of the vertical multiplier is set to 0, K1v
To K3v (K1v to K3v are setting values other than 0).

An outline emphasizing circuit according to the present invention writes video data of a plurality of uncorrelated images in different areas in a memory, and stores the plurality of video data written in the memory in one memory area. In a multiple video display device that reads out written video data and displays a plurality of videos on a display unit, a control signal CS indicating whether or not a boundary between the plurality of videos based on a synchronization signal, a clock, and setting data; A boundary control signal generation unit for generating a control signal CSS indicating whether or not the image is near a boundary between a plurality of images, an outline detection unit for detecting an outline emphasis component from image data read from a memory, and detection by the outline detection unit A first adder for adding the contour-enhanced component to the video data read from the memory and outputting contour-enhanced video data, wherein the contour detector comprises a target pixel and an image adjacent to both sides of the target pixel. A variable coefficient type multiplier for multiplying the video data by a coefficient less than 1 and outputting the multiplied data; a second adder for adding the data output from these multipliers and outputting as a contour emphasis component; According to the control signals CS and CSS generated by the boundary control signal generation unit, the coefficients of the three multipliers are set to 0,
L1 to L3 (L1 to L3 are set values other than 0), K1 to K
3 (K1 to K3 are set values other than 0, and the absolute value of K1> L
Multiplication coefficient switching means for switching to an absolute value of 1; an absolute value of K2> an absolute value of L2; an absolute value of K3> a value satisfying the absolute value of L3). In such a configuration, regarding a boundary between images, a signal that the control signals CS and CSS are boundaries (for example, both are H
Level), and the multiplication coefficient switching means is set to 3 in the contour detection unit.
Since the coefficients of the two multipliers are switched to 0, the contour emphasis component output from the contour detection unit becomes 0, and the contour emphasis processing is not performed. In addition, for images other than the boundary and the vicinity of the boundary, the control signals CS and CSS become signals indicating that they are not at the boundary and the vicinity of the boundary (for example, both are at L level), and the multiplication coefficient switching unit determines the coefficients of the three multipliers in the contour detection unit. K1-K
Since the mode is switched to 3, the contour emphasis component detected by the contour detection unit is added to the video data from the memory, and a predetermined contour emphasis process is performed for each of the plurality of videos. In addition, for the video near the boundary, the control signals CS, CSS
Is not at the boundary but is near the boundary (for example, C
S is at L level and CSS is at H level), and the multiplication coefficient switching means sets the coefficients of the three multipliers in the contour detection unit to L1 to L
3, the outline emphasis processing is performed. At this time, since the absolute values of the coefficients L1 to L3 are set to be smaller than the absolute values of the coefficients K1 to K3, the contour emphasis component detected by the contour detection unit becomes small, and the vicinity of the boundary looks unnatural due to the contour emphasis. Is prevented.

In order to enable horizontal and vertical contour emphasis processing and to prevent the boundary between the horizontal and vertical images and the vicinity of the image from appearing unnatural, the multiplier includes a target pixel and its corresponding pixel. A horizontal multiplier for multiplying video data of pixels adjacent on both sides in the horizontal direction by a coefficient less than 1 and outputting the result; and a coefficient less than 1 on video data of the target pixel and pixels adjacent on both sides in the vertical direction. A second adder for adding data output from the horizontal multiplier and outputting the result as a horizontal edge enhancement component; and A vertical adder for adding data output from the vertical multiplier and outputting the added data as a vertical contour enhancement component, wherein the multiplication coefficient switching means includes a control signal CS generated by a boundary control signal generator, The coefficient of the horizontal multiplier is set to 0 according to the CSS. L1h~L3h (L1h~L3h
Is a setting value other than 0), K1h to K3h, and the coefficient of the vertical multiplier is 0, L1v to L3v (L1v
(v to L3v are set values other than 0) and K1v to K3v are switched.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a first embodiment of an outline emphasizing circuit according to the present invention. The same parts as those in FIGS. 11 and 13 are denoted by the same reference numerals, and detailed description thereof will be omitted. In FIG. 1, 36 is an input selection circuit, 38 is a write processing circuit, 40
Is a memory, 42 is a read processing circuit, 44 is a PDP display unit, 50 is a group of registers, and 52 is a contour emphasis circuit.

The input selection circuit 36 includes input image data V1 to V1 corresponding to a plurality of uncorrelated images P1 to P12.
V12 is selected at a predetermined timing, the write processing circuit 38 writes the selected video data V1 to V12 to different areas in the memory 40, and the read processing circuit 42 Video data is read out as one memory area and output to the contour emphasizing circuit 52.

The register group 50 includes an enhancement amount selection signal KS for selecting the level of the outline enhancement amount, and HS and V as data for setting the position of a boundary between images.
S and WD are set as set values. The enhancement amount selection signal KS is composed of one of selectable H and L levels. When the enhancement level selection signal KS is an H level signal, the edge enhancement component is detected from the target pixel and the first dot adjacent to the target pixel (for example, a sharp pixel). In the case of detecting an edge enhancement amount of a video), when the signal is an L level signal, the target pixel and its adjacent two
This is a case where an outline emphasis component is detected from the pixel of the dot. The HS is the horizontal size (H-Si) of each image when a plurality of images are displayed on the PDP display unit 44.
ze), the VS represents a vertical size (V-Size) of each image, and the WD represents a boundary (Wide) of a plurality of displayed images.

The contour emphasizing circuit 52 includes a contour detecting section 1
2, the first adder 14, the boundary control signal generator 54 and the first
A selector 56 is provided. The contour detector 12
Are D-FFs 16, 18, 2 as in the conventional example of FIG.
0, 22; a selector 24 for switching and outputting input video data and video data output from the D-FF 16;
A selector 2 for switching and outputting the video data output from the D-FF 20 and the video data output from the D-FF 22
6 and the video data output from the selectors 24 and 26-
The multipliers 28 and 30 for multiplying by a factor of 1/4 (K1 =-／, an example of K3 =-／) and the video data output from the D-FF 18 by 1/2 (K2 = 1 / 2) and a second adder 3 that adds the operation values of the multipliers 28, 30, and 32 to calculate an outline emphasis component.
4. The selectors 24 and 26 are switched between a solid line connection state and a dotted line connection state by the H and L level signals of the enhancement amount selection signal KS.

The boundary control signal generator 54 includes a horizontal synchronizing signal Hsy and a vertical synchronizing signal Vsy corresponding to one of the input video data V1 to V12, and the register group 50.
Data HS, VS and WD set to
Based on K, a control signal CS indicating whether or not the boundary is between the images P1 to P12 corresponding to the input image data V1 to V12 is output. The first selector 56 is switched between a solid line connection state and a dotted line connection state according to a control signal CS (for example, an H or L level signal) output from the boundary control signal generation unit 54. The PDP display section 44 is based on the display video data output from the contour emphasizing circuit 52,
A plurality of images P1 to P12 as shown in FIG. 12 are displayed simultaneously on one display screen.

Next, the operation of FIG. 1 will be described with reference to FIGS. (1) A plurality of video data V1 to V12 are input selection circuit 3
6, the video data V1 to V12 are selected at a predetermined timing by the input selection circuit 36, and the selected video data V1 to V12 are stored in different memory areas in the memory 40 by the write processing circuit 38. And the written video data V1 to V12 are written in a read processing circuit 42.
Is read as one memory area, and the contour emphasis circuit 5
The operation up to the input of 2 is the same as in the conventional example. At this time, with respect to video data (for example, V1 and V4) corresponding to a moving image, the video data in the corresponding memory area in the memory 40 is also updated at a predetermined timing by the write processing circuit 38 in the related art. Same as the example.

(2) The contour detector 12 of the contour emphasizing circuit 52
Depends on whether the enhancement amount selection signal KS set in the register group 50 is an H level signal or an L level signal, and
1) As described in (2-2), an outline emphasis component is detected from video data read and input from the memory 40. (2-1) When the emphasis amount selection signal KS is an H level signal, the selectors 24 and 26 are connected to the solid line by this signal, and the D-FF which sequentially delays the input video data by one pixel.
D-FFs 16, 1 of 16, 18, 20, 22
For the video data output from each of 8 and 20,
Multipliers 28, 32, 30 use coefficients ／, 、, −1
/ 4 are multiplied, and the data obtained by this multiplication is added by the second adder 34. The value obtained by this addition is input to the first adder 14 as a horizontal edge enhancement component detected from the target pixel and the first dot adjacent to the target pixel. (2-2) When the enhancement amount selection signal KS is an L level signal, this signal causes the selectors 24 and 26 to be in a dotted line connection state, and the input video data, the video data output from the D-FF 18 and the D-FF 22 For video data output from
Multipliers 28, 32, 30 use coefficients ／, 、, −1
/ 4 are multiplied, and the data obtained by this multiplication is added by the second adder 34. The value obtained by this addition is input to the first adder 14 as a horizontal edge enhancement component detected from the target pixel and the second dot pixel on both sides thereof.

(3) The boundary control signal generator 54 of the contour emphasizing circuit 52 includes a horizontal synchronizing signal Hsy and a vertical synchronizing signal Vsy, and position data HS set by the register group 50, as shown in FIG. Based on VS and WD and a clock CK (not shown), a control signal C indicating whether or not a boundary between the images P1 to P12 corresponding to the input image data V1 to V12.
S is generated, and switching of the first selector 56 is controlled.
The first selector 56 is controlled to a solid line connection state when the control signal CS is at the H level, and to a dotted line connection state when the control signal CS is at the L level signal. In FIG. 2, the setting value WD representing the width of the boundary is, for example, a length of four pixels, and is exaggerated for convenience of illustration.

(4) The video data output from the D-FF 18 in the contour detector 12 is added by the first adder 14 to the contour emphasis component detected by the contour detector 12.
The video data before the edge enhancement component is added by the first adder 14 (that is, the video data output from the D-FF 18).
) And the video data after the outline emphasis component has been added by the first adder 14 are switched by the first selector 56 and input to the PDP display unit 44. For this reason, when the corresponding images P1 to P12 as shown in FIG. 10 are displayed on the PDP display unit 44, no outline enhancement is performed at the boundary BR between the images (the outline enhancement is OFF), and the respective images P1 are displayed. In P12 (images other than boundaries), contour enhancement is performed (contour enhancement is turned ON).

In the embodiment shown in FIG. 1, the switching of the first selector is controlled by the control signal CS generated by the boundary control signal generator, and the switching of the selectors (24, 26) is controlled by the enhancement amount selection signal KS. Was explained,
The present invention is not limited to this. The switching of the first selector is controlled by a control signal CS indicating whether or not it is at a boundary, and the switching of the selectors (24, 26) is controlled by a control signal CSS indicating whether or not it is near a boundary. It can also be used when doing so. For example, as shown in FIG. 3 (second embodiment),
Instead of the boundary control signal generator 54 in FIG.
A boundary control signal generation unit 54a for generating S and CSS is provided to control switching of the first selector 56 according to the control signal CS and to control switching of the selectors 24 and 26 according to the control signal CSS. It can also be used in some cases.

Next, the operation of FIG. 3 will be described with reference to FIG. For convenience of explanation, an image P as shown in FIG.
The boundary between P1 and P2 will be described. One pixel on one line of the image P1 will be described as ○, and one pixel on one line of the image P2 will be described as ◎ as shown in FIG.

(1) The boundary control signal generator 54a converts the horizontal synchronizing signal Hsy and the vertical synchronizing signal Vsy, the data HS, VS and WD set by the register group 50, and the clock CK (not shown). Based on FIG. 4 (c), (d)
And a control signal CSS indicating whether or not it is near the boundary between the images P1 to P12 corresponding to the input image data V1 to V12 and a control signal CSS indicating whether or not it is near the boundary.

(2) At the boundary between the images, the control signals CS and CSS become signals indicating that they are boundaries (for example, both are at H level).
Are controlled to be in the solid line connection state, so that the video data (D-FF 18) before the outline enhancement component is added by the first adder 14
The video data output from) is output. Therefore, the pixels G11, G12, G2 located at the boundary between the images P1 and P2
1 and G22, the outline emphasis component becomes 0 as shown in FIG. 4E, and no outline emphasis is performed.

(3) For images other than the boundary and the vicinity of the boundary, the control signals CS and CSS become signals indicating that they are not at the boundary and the vicinity of the boundary (for example, both are at L level), and the control signal CS sets the first selector 56 to the dotted connection state. And the selectors 24 and 26 are controlled by the control signal CSS so as to be connected in a dotted line, so that the video data output from each of the D-FFs 16, 18 and 20 is multiplied by the multiplier 2
The coefficients are multiplied by 8, 32, and 30 with the coefficients-、, 、, and-／, and the data obtained by the multiplication is added by the second adder 34. The value obtained by this addition is input to the first adder 14 as a horizontal edge enhancement component detected from the target pixel and the first dot adjacent to the target pixel. Therefore, for the pixels G16, G17,..., G26, G27,... Located at the boundaries between the images P1 and P2 and near the boundaries, the outline emphasis component becomes strong as shown in FIG. A predetermined contour enhancement is performed.

(4) With respect to the video near the boundary, the control signals CS and CSS are not boundaries but are signals indicating that they are near the boundary (for example, CS is at L level and CSS is at H level). The selector 56 is controlled to a dotted line connection state, and the selector 24 is controlled by the control signal CSS.
26 is controlled to a solid line connection state, so that the input video data
Data, video data output from the D-FF 18, D-FF2
The multipliers 28, 3
The coefficients are multiplied by coefficients − ／, 、, and −−１ at 2 and 30, and the data obtained by the multiplication is added by the second adder 34. The value obtained by this addition is input to the first adder 14 as a horizontal edge enhancement component detected from the target pixel and the second dot pixel on both sides thereof. Therefore, the image P
Pixels G13 to G15, G located near the boundary between P1 and P2
The outline emphasis is performed on 23 to G25. In this outline emphasis, since the outline emphasis component becomes weak as shown in FIG. 4E, it is possible to prevent the vicinity of the boundary from looking unnatural due to the outline emphasis.

FIG. 5 shows a third embodiment of the contour emphasizing circuit according to the present invention. The same parts as those in FIG. In FIG. 5, reference numeral 12a denotes a contour detection unit, and 58 denotes a ROM (read only memory) as an example of a multiplication coefficient switching unit.

The ROM 58 forms an LUT (Look Up Table), and uses a control signal CS (H, L level signal) output from the boundary control signal generator 54 as an address to store a group of coefficients 0, 0, 0 stored in advance. And coefficient group-1 /
4, − ／, 1/2 (K1 = − ／, K2 = −1 /
4, K3 = １ ／) and outputs.

The contour detector 12a includes D-FFs 16, 18, 20, 22, a selector 24,
26 and a first adder 34, as well as variable coefficient multipliers 60, 62 and 64. The multiplier 60 applies a coefficient 0 or -1/0 output from the ROM 58 to the video data selected by the selector 24.
Multiply by 4 and output. The multiplier 62 applies the video data selected by the selector 26 to the ROM 5.
8 is multiplied by the coefficient 0 or-／ outputted from the signal 8 and outputted. The multiplier 64 multiplies the video data output from the D-FF 18 by the coefficient 0 or 1/2 output from the ROM 58 and outputs the result.

Next, the operation of the embodiment of FIG. 5 will be described. (1) The selectors 24 and 26 in the contour detection unit 12a are controlled by the emphasis amount selection signal KS as in the case of FIG. That is, when the emphasis amount selection signal KS is an H level signal, the selectors 24 and 26 are connected to the solid lines by this signal, and the video data output from each of the D-FFs 16, 18, and 20 is multiplied by the multipliers 60, 64, Input to 62.
When the emphasis amount selection signal KS is an L level signal, this signal causes the selectors 24 and 26 to be in a dotted line connection state, so that the input video data, the video data output from the D-FF 18 and the D-FF
Video data output from the FF 22 is output to multipliers 60 and 6.
4 and 62 are input.

(2) When the control signal CS output from the boundary control signal generator 54 is at the H level, the coefficient groups output from the ROM 58 to the multipliers 60, 64, 62 are 0, 0, 0
Therefore, the outputs of the multipliers 60, 64, and 62 become 0, and the contour emphasis component output from the contour detector 12a to the first adder 14 becomes 0. For this reason, when the images P1 to P12 as shown in FIG. 10 are displayed on the PDP display unit 44, the edge enhancement is not performed at the boundary BR between the images.

(3) When the control signal CS output from the boundary control signal generator 54 is at L level, the coefficient group output from the ROM 58 to the multipliers 60, 64, 62 is-／,
1/2, -−１. Therefore, the multipliers 60 and 6
4/62 with respect to the video data input by
The multiplication of 4, 1/2 and-／ is performed, and the second addition unit 34
Is added. The value obtained by this addition is output from the contour detector 12a to the first adder 14 as a contour emphasis component. Therefore, when the images P1 to P12 shown in FIG. 10 are displayed on the PDP display unit 44, the outline enhancement is performed on each of the images P1 to P12 (images other than boundaries).

In the embodiment shown in FIG. 5, two kinds of coefficient groups (0, 0, 0 and -−１,-／, 1) are stored in the ROM.
/ 2) is stored in advance, and the coefficient group of the variable coefficient multiplier is controlled to be switched in two stages by the control signal CS generated by the boundary control signal generation unit. However, the present invention is not limited to this. Instead, three kinds of coefficient groups are stored in the ROM in advance, and the coefficient group of the variable coefficient multiplier is controlled in three stages by the control signals CSS and CS generated by the boundary control signal generation unit. Can be used.

For example, as shown in FIG. 6 (fourth embodiment), instead of the boundary control signal generator 54, the ROM 58, and the multipliers 60, 62, 64 shown in FIG.
4a, a ROM 58a, and multipliers 60a, 62a, 64a are provided, and 0, 0, 0 and-、, -1
/ 8, 1/4 (L1 = − ／, L2 = − ／, L3
= 1/4) and-1/4,-1/4, 1/2 (K
1 =-／, K2 =-／, K3 = １ ／) are stored in advance, and the boundary control signal generation unit 54a controls whether the boundary is a boundary or not. A signal CS and a control signal CSS indicating whether it is near the boundary are generated. When both control signals CS and CSS are at the H level, a coefficient group 0,
When the control signal CS is at the L level and the control signal CSS is at the H level, the coefficient groups ／, ／, １ ／
When the control signals CS and CSS are both at the L level, the coefficient groups-／,-、, and
It is configured to output from 58a to multipliers 60a, 62a, 64a.

Next, the operation of FIG. 6 will be described. (1) Control signals CS, C
SS becomes H level, and the coefficient group output from the ROM 58a to the multipliers 60a, 64a, 62a is 0, 0, 0.
Therefore, the outputs of the multipliers 60a, 64a and 62a become 0
And the contour emphasis component output from the contour detection unit 12b to the first addition unit 14 is 0. Therefore, the PDP display unit 4
4, when the images P1 to P12 as shown in FIG. 10 are displayed, no outline enhancement is performed at the boundary BR between the images.

(2) For the image other than the boundary and the vicinity of the boundary, both the control signals CS and CSS are at the L level,
Since the coefficient groups output from the ROM 58a to the multipliers 60a, 62a, and 64a are-／,-／, and 、,
The multipliers 60a, 62a, 64a respectively output -−１,-／, and に 対 す る of the input video data.
Are multiplied by a second adder 34, and the sum is input to the first adder 14 as a contour emphasis component. For this reason, the PDP display unit 44 displays an image P as shown in FIG.
When 1 to P12 are displayed, normal set contour enhancement is performed on pixels except for the boundary BR between the images and the vicinity of the boundary. For example, as shown in the operation of the embodiment of FIG. 3, pixels G16, G17,..., G26 located at the boundaries between the images P1 and P2 and near the boundaries.
With respect to G27,...
It becomes strong as shown in FIG.

(3) For an image near the boundary, the control signal CS goes low and the control signal CSS goes high.
Since the coefficient groups output from the ROM 58a to the multipliers 60a, 62a, 64a are −１, ／, １ ／,
The multipliers 60a, 62a and 64a respectively use -−１,-／, and ４ of the input video data.
Are multiplied by a second adder 34, and the sum is input to the first adder 14 as a contour emphasis component. For this reason, the PDP display unit 44 displays an image P as shown in FIG.
When 1 to P12 are displayed, the pixels near the boundary between the images (excluding the boundary) are edge-enhanced.
Is weaker than in the case of. For example, as shown by the operation of the embodiment of FIG. 3, the pixels G13 to G15 and G23 to G25 located near the boundary between the images P1 and P2 have the edge enhancement components as shown in FIG. To prevent the area near the border from looking unnatural due to contour emphasis.

In the above embodiment, twelve video data V having no correlation are stored in different memory areas of one memory space.
1 to V12 are written, and the images P1 to P12 corresponding to the image data V1 to V12 read from the memory space are displayed on the display section with substantially the same area. However, the present invention is not limited to this. Rather, writing a plurality of uncorrelated video data to different memory areas of at least one of the plurality of memory spaces,
The present invention can also be applied to a case where a part or the whole of an image corresponding to a plurality of image data read from the memory space is displayed on the display unit as different areas.

For example, FIGS. 7 and 8 (fifth embodiment)
, Circuits 72 and 74 for processing the two memory spaces 1 and 2, a multi-screen processing circuit 76, and a selector 78
And the case where the contour emphasis circuit 52 is provided. The processing circuit 72 in the memory space 1
It has a memory, a write processing circuit, a read processing circuit, and a register group (not shown), writes video data V1 for a moving image in a memory (memory space 1), reads out the video data at a predetermined timing, and selects a selector. 78 to one input side. The processing circuit 74 in the memory space 2 includes an input selection circuit, a memory, a write processing circuit, a read processing circuit, a register group, and an outline emphasis circuit (for example, the input selection circuit 36, the memory 40, and the write processing similar to the configuration shown in FIG. 1). Circuit 38,
Read processing circuit 42, register group 50, contour emphasis circuit 5
2), moving image data V2 and still image data V3 are stored in different areas of the memory (memory space 2).
To V6 are written, and a plurality of video data V2 to V6 written in this memory are set at predetermined timings as video data written in one memory area (apparently as video data for one screen). And outputs it to the other input side of the selector 78. The selector 78 converts the video data output from the processing circuit 72 in the memory space 1 and the video data output from the processing circuit 74 in the memory space 2 based on the switching control signal from the multi-screen processing circuit 76. Switching and outputting to a display unit (for example, a PDP display unit) as video data for display. For this reason, a display image as shown in the lower part of FIG. 8 is displayed on the display unit. At this time, since the contour emphasizing circuit (for example, the contour emphasizing circuit 52 shown in FIG. 1) in the processing circuit 74 in the memory space 2 has the same configuration as that shown in FIG. 1, the images P2, P3, and P4 , P5,
No outline enhancement is performed on the boundary BR at P6, and predetermined outline enhancement is performed on images other than the boundary.

In the above-described embodiment, the case where the edge enhancement component is detected from the target pixel and the first dot pixel on both sides thereof or the case where the edge enhancement component is detected from the target pixel and the second dot pixel on both sides thereof has been described. However, the present invention is not limited to this, and can be used in other cases (for example, when an edge enhancement component is detected from the target pixel and the third dot pixel on both sides of the target pixel).

In the above embodiment, the coefficients K1, K2, and K3 by which the three multipliers in the contour detection unit are multiplied by-、,
In the case of −１ ／, １ ／, or when the coefficients K1, K2, K3 by which the three multipliers are multiplied are −−１, − ／, １ ／
And the coefficients L1, L2, L3 are -−１,-／,
Although the case of 1/4 has been described, the present invention is not limited to this. For example, if the coefficients to be multiplied by the three multipliers are switchable 0, K1 to K3, and L1 to L3, the absolute value of K1> the absolute value of L1, the absolute value of K2> the absolute value of L2, It can be used when the condition of absolute value of K3> absolute value of L3 is satisfied.

In the above-described embodiment, a case has been described in which the horizontal edge enhancement component is detected to enhance the horizontal edge. However, the present invention is not limited to this, and the vertical edge enhancement component is detected. To enhance the vertical contour, to enhance the diagonal contour by detecting the diagonal contour enhancement component, or to enhance the horizontal, vertical, or diagonal arbitrary two or three directions. The present invention can also be used in a case where components are detected to emphasize the contours in those directions. For example, the multiplier in the contour detection unit is configured by a horizontal multiplier and a vertical multiplier, and the second adder in the contour detection unit is configured by a horizontal adder and a vertical adder,
The multiplication coefficient switching means switches the coefficients of the horizontal multiplier to 0, L1h to L3h, and K1h to K3h according to the control signals CS and CSS generated by the boundary control signal generation unit, and sets the coefficient of the vertical multiplier to 0, L1v to L3v, K1
It can also be used in the case where the configuration is switched from v to K3v. In this case, it is possible to perform the horizontal and vertical direction edge enhancement processing, and to prevent the boundary between the horizontal and vertical images and the vicinity of the image from looking unnatural.

Next, an example of a circuit which enables such horizontal and vertical contour enhancement processing will be described with reference to FIG. In FIG. 9, reference numeral 11a denotes a circuit for enhancing the contour in the horizontal direction, and 13a denotes a circuit for enhancing the contour in the vertical direction. The horizontal contour emphasizing circuit 11a is formed in the same manner as the circuit shown in FIG.
A vertical edge enhancement circuit 13a for detecting an edge enhancement component in a vertical direction based on video data input from the horizontal edge enhancement circuit 11a;
A first-a adder 17 which adds the vertical edge enhancement component detected by the edge detection unit 15a to the input video data and outputs the input video data to a display device such as a PDP (not shown) as edge-enhanced video data. And consisted of

The contour detecting section 15a is a line memory (hereinafter simply referred to as LM) 19, 21, 2 as an example of a delay unit for sequentially delaying input video data by one line.
A selector 27 for switching and outputting the input video data and the video data output from the LM 19;
A selector 29 for switching and outputting the video data output from the LM 25 and the video data output from the LM 25; variable coefficient multipliers 31 and 33 coupled to respective output sides of the selectors 27 and 29; It comprises a variable coefficient multiplier 35 coupled to the output side of the LM 21 and a 2a adder 37 for calculating the vertical edge enhancement component by adding the calculated values of 31, 33 and 35. . The multiplier 31
Multiplies the video data selected by the selector 27 by the coefficient 0 or-／ output from the ROM 58 and outputs the result. The multiplier 33 is connected to the selector 2
The video data selected at step 9 is multiplied by the coefficient 0 or-／ output from the ROM 58 and output. The multiplier 35 applies a coefficient 0 or 1/1 output from the ROM 58 to the video data output from the LM 21.
Multiply by 2 and output.

Next, the operation of the embodiment shown in FIG. 9 will be described. The process until the video data to which the horizontal edge enhancement component is added is output from the first adder 14 of the horizontal edge enhancement circuit 11a is the same as that of the embodiment of FIG. (1) The selectors 27 and 29 in the contour detection unit 15a are controlled by the emphasis amount selection signal KS as in the case of FIG. That is, when the enhancement amount selection signal KS is an H level signal, the selectors 27 and 29 are connected to the solid lines by this signal, and the video data output from each of the LMs 19, 21 and 23 is supplied to the multipliers 31, 35 and 33. input. When the enhancement amount selection signal KS is an L level signal, this signal causes the selectors 27 and 29 to be in a dotted line connection state, and the input video data, the video data output from the LM21, and the video data output from the LM25 are: Input to 31, 35 and 33.

(2) When the control signal CS output from the boundary control signal generator 54 is at the H level, the coefficient groups output from the ROM 58 to the multipliers 31, 35, 33 are 0, 0, 0
Therefore, the outputs of the multipliers 31, 35, and 33 become 0, and the vertical edge enhancement component output from the edge detector 15a to the first adder 17 becomes 0. For this reason, PDP
When the images P1 to P12 as shown in FIG. 10 are displayed on the display unit 44, the horizontal and vertical contour enhancement is not performed at the boundary BR between the images.

(3) When the control signal CS output from the boundary control signal generator 54 is at L level, the coefficient group output from the ROM 58 to the multipliers 31, 35, 33 is -−１,
1/2, -−１. Therefore, the multipliers 31, 3
5/33 with respect to the video data input by
The multiplication of 4, 1/2, and-1/4 is performed, and the 2a-th adder 3
7 is added. The value obtained by this addition is output from the contour detector 15 to the 1a-th adder 17 as a contour emphasis component. Therefore, when the images P1 to P12 as shown in FIG. 12 are displayed on the PDP display unit 44, the horizontal and vertical contour enhancement is performed on each of the images P1 to P12 (images other than boundaries).

Next, another example of the circuit which enables the horizontal and vertical contour enhancement processing will be described with reference to FIG. In FIG. 10, reference numeral 11b denotes a circuit for enhancing the contour in the horizontal direction, and 13b denotes a circuit for enhancing the contour in the vertical direction. The horizontal direction edge enhancement circuit 11b is formed in the same manner as the circuit shown in FIG. The vertical edge enhancement circuit 13b detects an edge enhancement component in the vertical direction based on video data input from the horizontal edge enhancement circuit 11b, and the edge detector 15b detects the vertical edge enhancement component. 1a which adds a vertical edge enhancement component to the input video data and outputs it to a display device such as a PDP (not shown) as edge-enhanced video data.
And an adder 17.

The contour detecting section 15b sequentially delays the inputted video data by one line by LM19, 21, 2
A selector 27 for switching and outputting the input video data and the video data output from the LM 19;
A selector 29 for switching and outputting the video data output from the LM 25 and the video data output from the LM 25; variable coefficient multipliers 31a and 33a coupled to the respective output sides of the selectors 27 and 29; A variable coefficient multiplier 35a coupled to the output side of the LM 21;
a and a 2a adder 37 for calculating the vertical edge enhancement component by adding the calculated values of 35a. The multiplier 31a applies a coefficient 0 output from the ROM 58a to the video data selected by the selector 27,
Multiply by １ ／ or ／ and output. The multiplier 33a outputs a coefficient 0- ／ output from the ROM 58a to the video data selected by the selector 29.
Or, multiply by -−１ and output. The multiplier 35a
Represents the coefficient 0, 1/4 or 1/2 output from the ROM 58a with respect to the video data output from the LM 21.
And output.

Next, the operation of the embodiment shown in FIG. 10 will be described. The process until the video data to which the horizontal edge enhancement component is added is output from the first adder 14 of the horizontal edge enhancement circuit 11b is the same as that of the embodiment of FIG. (1) Since the selectors 27 and 29 in the contour detection unit 15b are controlled by the enhancement amount selection signal KS as in the case of FIG. 9, the description is omitted.

(2) The control signals CS, CS output from the boundary control signal generation unit 54a
S both attain an H level, and the multiplier 3
Since the coefficient groups output to 1a, 35a, and 33a are 0, 0, and 0, the outputs of multipliers 31a, 35a, and 33a are 0, and the vertical contour output from contour detector 15b to first adder 17 is provided. The emphasis component becomes 0. Therefore, PD
When images P1 to P12 as shown in FIG. 12 are displayed on the P display unit 44, horizontal and vertical contour enhancement is not performed at a boundary BR between the images.

(3) For the image other than the boundary and the vicinity of the boundary, the control signals CS and CSS are both at the L level,
Since the coefficient groups output from the ROM 58a to the multipliers 31a, 35a, and 33a are ／, １ ／, and ／,
Multipliers 31a, 35a and 33a output -−１, 、, and に 対 す る of the input video data.
Is multiplied by the second adder 37, and the added value is used as a vertical edge enhancement component by the first adder 17a.
To enter. For this reason, when the images P1 to P12 as shown in FIG. 12 are displayed on the PDP display unit 44, the pixels except for the boundary BR between the images and the vicinity of the boundary are set in the normal horizontal and vertical directions. Edge enhancement is performed.

(4) For an image near the boundary, the control signal CS goes low and the control signal CSS goes high.
Since the coefficient groups output from the ROM 58a to the multipliers 31a, 35a, and 33a are ８, １ ／, and −１,
Multipliers 31a, 35a and 33a respectively use -−１, ４, and ／ of the video data input thereto.
Is multiplied by the second adder 37, and the added value is used as a vertical edge enhancement component by the first adder 17a.
To enter. For this reason, when the images P1 to P12 as shown in FIG. 12 are displayed on the PDP display unit 44, the pixels in the vicinity of the boundary between the images (excluding the boundary) are emphasized in the horizontal and vertical contours. In this case, the outline is weaker than in the case of the above (3), and the vicinity of the boundary is prevented from appearing unnatural due to the outline enhancement.

In the embodiment shown in FIGS. 9 and 10, the same coefficient group as the coefficient group output to the variable coefficient multiplier of the horizontal contour emphasizing circuit is used as the variable coefficient multiplier of the vertical contour emphasizing circuit. However, the present invention is not limited to this. The coefficient group output to the coefficient variable type multiplier of the horizontal contour emphasis circuit and the coefficient group output to the coefficient variable type multiplier of the vertical contour emphasis circuit are output. It can also be used when the coefficient group is different from the coefficient group.

[0057]

The outline emphasizing circuit according to the present invention includes a boundary control signal generation section, an outline detection section, a first addition section and a first selector in a multi-image display apparatus, and a control signal generated by the boundary control signal generation section. In accordance with the CS, video data before the contour enhancement component is added and video data after the contour enhancement component are added are switched and output to the display unit side. For this reason, at the boundary between the images, the image data before the addition of the outline emphasis component is output to the display unit side and the outline emphasis processing is not performed, so that the boundary looks unnatural due to the outline emphasis. Can be prevented. In addition, since the image other than the boundary is output to the image data display side after the outline emphasis component is added, a predetermined outline emphasis process can be performed.

The boundary control signal generating section generates a control signal CS indicating whether or not a boundary is present and a control signal CSS indicating whether or not the boundary is present. The image before the contour emphasis component is added in accordance with the control signal CS. A first selector for switching between the data and the video data after the contour emphasis component has been added and outputting the data to the display unit, and a weak contour emphasis component detected by the contour detection unit in response to the control signal CSS. In the case where the second selector for switching to the strong output is provided, it is possible to prevent the boundary between the uncorrelated plural images and the vicinity of the boundary from looking unnatural.

In the case where the contour detecting section is composed of a horizontal contour detecting section for detecting a horizontal contour emphasizing component and a vertical contour detecting section for detecting a vertical contour emphasizing component, the horizontal and vertical contours are obtained. The emphasis processing can be performed, and the boundary between the images in the horizontal and vertical directions (or the boundary and the vicinity of the boundary) can be prevented from looking unnatural.

The contour emphasizing circuit according to the present invention includes a boundary control signal generating section, a contour detecting section, and a first adding section in a multiple video display apparatus, wherein the contour detecting section is a multiplier, a second adding section, and a multiplication coefficient switching means. The multiplication coefficient switching means switches the coefficients of the three multipliers in the contour detection unit to 0 and K1 to K3 according to the control signal CS generated by the boundary control signal generation unit. For this reason, at the boundary between the images, the control signal CS becomes a signal (for example, H level) that is the boundary, and the multiplication coefficient switching means switches the coefficients of the three multipliers in the outline detection unit to 0. The contour emphasis component output from the detection unit becomes 0, the contour emphasis processing is not performed, and the boundary can be prevented from looking unnatural. For the video other than the boundary, the control signal CS becomes a signal (for example, L level) that is not the boundary, and the multiplication coefficient switching means sets the coefficients of the three multipliers in the contour detection unit to K1 to K.
Since the mode is switched to 3, the contour emphasizing component detected by the contour detecting unit is added to the video data from the memory, and a predetermined contour emphasizing process can be performed for each of the plurality of videos.

The multiplier is composed of a horizontal multiplier and a vertical multiplier, the second adder is composed of a horizontal adder and a vertical adder, and the multiplication coefficient switching means is provided with a boundary control signal. In a case where the coefficient of the horizontal multiplier is switched to 0 and K1h to K3h in accordance with the control signal CS generated by the generation unit, and the coefficient of the vertical multiplier is switched to 0 and K1v to K3v, In addition to enabling horizontal and vertical contour enhancement, it is possible to prevent the boundary between horizontal and vertical images from looking unnatural.

A contour emphasizing circuit according to the present invention includes a boundary control signal generating section, a contour detecting section, and a first adding section in a multiple video display apparatus, wherein the contour detecting section includes a multiplier, a second adding section, and a multiplication coefficient switching means. And the multiplication coefficient switching means sets the coefficients of the three multipliers in the contour detection unit to 0, L1 to L1 according to the control signals CS and CSS generated by the boundary control signal generation unit.
3. In the case of switching from K1 to K3,
It has the following effects. As for the boundary between the images, the control signals CS and CSS become signals indicating that they are boundaries (for example, both are at H level), and the multiplication coefficient switching means switches the coefficients of the three multipliers in the contour detection unit to 0.
The contour emphasis component output from the contour detection unit becomes 0, the contour emphasis processing is not performed, and the boundary can be prevented from looking unnatural. Also, for images other than at the border and near the border,
The control signals CS and CSS become signals indicating that they are not at the boundary or near the boundary (for example, both are at L level), and the multiplication coefficient switching means switches the coefficients of the three multipliers in the outline detection unit to K1 to K3. The obtained contour emphasis component is added to the video data from the memory, and a predetermined contour emphasis process is performed for each of the plurality of videos. In addition, for an image near the boundary, a signal indicating that the control signals CS and CSS are not at the boundary but are near the boundary (for example, when CS is L
Level and CSS become H level), and the multiplication coefficient switching means switches the coefficients of the three multipliers in the contour detection unit to L1 to L3, so that the contour emphasis processing is performed. At this time, since the absolute values of the coefficients L1 to L3 are set to be smaller than the absolute values of the coefficients K1 to K3, the contour emphasis component detected by the contour detection unit becomes small, and the border vicinity becomes unnatural due to the contour emphasis. Can be prevented.

The multiplier is composed of a horizontal multiplier and a vertical multiplier, the second adder is composed of a horizontal adder and a vertical adder, and the multiplication coefficient switching means is a boundary control signal. The coefficients of the horizontal multiplier are switched to 0, L1h to L3h, and K1h to K3h in accordance with the control signals CS and CSS generated by the generation unit, and the coefficients of the vertical multiplier are set to 0 and L1v to L1.
In the case of switching to 3v and K1v to K3v, horizontal and vertical contour emphasis processing is enabled, and the boundary between horizontal and vertical images and the vicinity of the image are prevented from looking unnatural. be able to.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of a contour emphasizing circuit of a multi-image display device according to the present invention.

FIG. 2 is an explanatory diagram showing a control signal CS generated by a boundary control signal generator 54 in FIG.

FIG. 3 is a block diagram showing a main part of a second embodiment of the contour emphasizing circuit of the multi-image display device according to the present invention.

FIG. 4 is an explanatory diagram showing the operation of FIG. 3;

FIG. 5 is a block diagram showing a main part of a third embodiment of an outline emphasizing circuit of a multi-image display device according to the present invention.

FIG. 6 is a block diagram showing a main part of a fourth embodiment of the contour emphasizing circuit of the multi-image display device according to the present invention.

FIG. 7 is a block diagram showing an outline of a fifth embodiment of an outline emphasizing circuit of a multiple image display device according to the present invention.

FIG. 8 is an explanatory diagram showing the operation of FIG. 7;

FIG. 9 is a block diagram showing an example of a circuit that enables horizontal and vertical contour emphasis processing.

FIG. 10 is a block diagram showing another example of a circuit that enables horizontal and vertical contour enhancement processing.

FIG. 11 is a block diagram showing a conventional outline emphasis circuit.

FIG. 12 shows a plurality of images (P1 to P12) on one display screen.
FIG. 7 is a display screen diagram showing a state in which are displayed simultaneously.

FIG. 13 is a block diagram showing a circuit configuration when an outline emphasis circuit is used for a display device that displays the display screen of FIG.

[Explanation of symbols]

12: contour detection unit, 14: first adder (an example of a first addition unit), 16, 18, 20, 22 ... delay unit, 24,
26: second selector, 28, 30, 32 ... multiplier,
34: a second adder (an example of a second adder), 36: an input selection circuit, 38: a write processing circuit, 40: a memory,
Reference numeral 42: a read processing circuit 44: a PDP display unit (an example of a display unit) 50: a register group 52: an outline emphasis circuit 54, 54a: a boundary control signal generation unit 56: a first selector 58, 58a ROM (Example of multiplication coefficient switching means) 60, 60a, 62, 62a, 64, 6
4a: Variable coefficient multiplier 72: Processing circuit in memory space 1 74: Processing circuit in memory space 2 76: Multi-screen processing circuit 78: Selector BR: Boundary,
CK: clock, CS: control signal indicating a boundary, C
SS: a control signal indicating the vicinity of the boundary; HS: a set value indicating the size in the horizontal direction; Hsy: a horizontal synchronization signal;
K3, K1h to K3h, K1v to K3v, L1 to L3,
L1h to L3h, L1v to L3v... Multiplier coefficients, K
S: enhancement amount selection signal, P1 to P12: video, V1 to
V12: Image data of the images P1 to P12, VS: A set value representing the size in the vertical direction.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Junichi Onodera 1116 Suenaga, Takatsu-ku, Kawasaki, Kanagawa Prefecture Inside Fujitsu General Co., Ltd. 72) Inventor Tohru Aida 1116, Suenaga, Takatsu-ku, Kawasaki City, Kanagawa Prefecture F-term in Fujitsu General Limited (Reference) 5B057 AA20 CA08 CA12 CA16 CB08 CB12 CB16 CE03 CE10 DA16 DB02 DB09 DC16 5C021 PA17 PA42 PA57 PA58 PA66 PA67 RA02 RA06 RA12 SA08 SA22 SA25 XB03 5C082 BA20 BA41 CA11 CA62 CA82 CB01 DA51 MM10

Claims (7)

[Claims] 1. A plurality of video data having no correlation are written in different areas in a memory, and the plurality of video data written in the memory is written in a single memory area. A boundary control signal generation unit for generating a control signal CS indicating whether or not the boundary is between a plurality of images based on a synchronization signal, a clock, and setting data in a multi-image display device which reads out as a data and displays a plurality of images on a display unit. A contour detector for detecting a contour emphasis component from the video data read from the memory, and a contour emphasis component added by the contour emphasis component detected by the contour detector to the video data read from the memory. A first adder for outputting video data, and a video data before the edge enhancement component is added by the first adder in accordance with the control signal CS generated by the boundary control signal generator.
And a first selector for switching between the image data after the outline emphasis component is added by the first adder and outputting the data to the display unit. 2. The video data of a plurality of images having no correlation are written in different areas in a memory, and the plurality of video data written in the memory is written in a single memory area. In a multi-image display device which reads out as a data and displays a plurality of images on a display unit, a control signal CS indicating whether or not the image is a boundary between the plurality of images based on a synchronization signal, a clock and setting data, and Control signal CS shown
A boundary control signal generator for generating S, a contour detector for detecting a contour emphasis component from the video data read from the memory, and a video read from the memory for the contour emphasis component detected by the contour detector. A first adder for adding image data to output edge-enhanced video data; and a first adder for controlling the first control signal generated by the boundary control signal generator.
The video data before the contour enhancement component is added by the addition unit and the video data after the contour enhancement component is added by the first addition unit.
And a first selector that switches the data to the display unit side and outputs the signal to the display unit side, wherein the contour detection unit weakens the detected contour emphasis component in accordance with the control signal CSS generated by the boundary control signal generation unit, A contour emphasizing circuit comprising a second selector for switching to a strong output. 3. A contour detection section for detecting a horizontal contour enhancement component from video data read from a memory, and a vertical contour enhancement component from a video data read from the memory. 3. A contour emphasizing circuit according to claim 1, further comprising a vertical contour detecting section for detecting the following. 4. A plurality of video data having no correlation are written in different areas in a memory, and the plurality of video data written in the memory is written in one memory area. A boundary control signal generation unit for generating a control signal CS indicating whether or not the boundary is between a plurality of images based on a synchronization signal, a clock, and setting data in a multi-image display device which reads out as a data and displays a plurality of images on a display unit. A contour detector for detecting a contour emphasis component from the video data read from the memory, and a contour emphasis component added by the contour emphasis component detected by the contour detector to the video data read from the memory. A first adder for outputting video data, wherein the contour detection unit varies three coefficients by multiplying video data of a target pixel and pixels adjacent to both sides of the target pixel by a coefficient less than 1; Type multiplication A second adder for adding data output from these multipliers and outputting the added data as a contour emphasis component; and a coefficient of the three multipliers according to a control signal CS generated by the boundary control signal generator. To 0, K1 to K3 (K
(1 to K3 are setting values other than 0). 5. A plurality of video data having no correlation are written in different areas in a memory, and the plurality of video data written in the memory is written in a single memory area. In a multi-image display device that reads as a data and displays a plurality of images on a display unit, a control signal CS indicating whether or not the image is a boundary between the plurality of images based on a synchronization signal, a clock, and setting data; A boundary control signal generating unit for generating a control signal CSS indicating whether or not the edge is detected, a contour detecting unit for detecting a contour emphasizing component from the video data read from the memory, and a contour emphasizing component detected by the contour detecting unit. A first adder for adding image data read from the memory and outputting image data with contour emphasis, wherein the outline detector detects the image data of a target pixel and pixels adjacent to both sides of the target pixel. - Three coefficient-variable multipliers for multiplying and outputting a coefficient less than, a second adder for adding data output from these multipliers and outputting as a contour enhancement component, and a boundary control signal generator. The generated control signal CS,
According to CSS, the coefficients of the three multipliers are set to 0, L1 to L1.
L3 (L1 to L3 are set values other than 0), K1 to K3 (K
1 to K3 are set values other than 0, and the absolute value of K1> the absolute value of L1, the absolute value of K2> the absolute value of L2, the absolute value of K3> L
A multiplication coefficient switching means for switching to a value satisfying the absolute value of 3). 6. A horizontal multiplier for multiplying video data of a target pixel and image data of a pixel adjacent on both sides in the horizontal direction by a coefficient less than 1 and outputting the result. A vertical multiplier for multiplying video data of adjacent pixels by a coefficient less than 1 and outputting the multiplied data; a second adder for adding data output from the horizontal multiplier and adding the data in the horizontal direction The multiplication coefficient switching means comprises a horizontal adder for outputting as a contour emphasis component, and a vertical adder for adding data outputted from the vertical multiplier and outputting the result as a vertical contour emphasis component. According to the control signal CS generated by the boundary control signal generation unit, the coefficient of the horizontal multiplier is set to 0, K1h to
K3h (K1h to K3h are set values other than 0), and the coefficient of the vertical multiplier is set to 0, K1v to
5. The contour emphasizing circuit according to claim 4, wherein the circuit is switched to K3v (K1v to K3v are set values other than 0). 7. A horizontal multiplier for multiplying video data of a target pixel and image data of a pixel adjacent on both sides in the horizontal direction by a coefficient of less than 1 and outputting the result. A vertical multiplier for multiplying video data of adjacent pixels by a coefficient less than 1 and outputting the multiplied data; a second adder for adding data output from the horizontal multiplier and adding the data in the horizontal direction The multiplication coefficient switching means comprises a horizontal adder for outputting as a contour emphasis component, and a vertical adder for adding data outputted from the vertical multiplier and outputting the result as a vertical contour emphasis component. According to the control signals CS and CSS generated by the boundary control signal generation unit, the coefficient of the horizontal multiplier is set to 0,
L1h to L3h (L1h to L3h are setting values other than 0),
K1h to K3h (K1h to K3h are set values other than 0,
Absolute value of K1h> absolute value of L1h, absolute value of K2h> L
2h, the absolute value of K3h> the value that satisfies the absolute value of L3h), and the coefficients of the vertical multiplier are set to 0, L1v to L3v (L1v to Lnv are set values other than 0), and K1v to K3v. (K1v to K3v are set values other than 0, and are switched to values satisfying the absolute value of K1v> the absolute value of L1v, the absolute value of K2v> the absolute value of L2v, the absolute value of K3v> the absolute value of L3v). Item 6. An outline emphasizing circuit according to Item 5.