WO2001082285A1

WO2001082285A1 - Overlay display controller

Info

Publication number: WO2001082285A1
Application number: PCT/JP2001/003606
Authority: WO
Inventors: Hidehiko Watanabe; Shinichi Takarada
Original assignee: Matsushita Electric Industrial Co., Ltd.
Priority date: 2000-04-26
Filing date: 2001-04-26
Publication date: 2001-11-01
Also published as: TW505884B; JP2001309160A

Abstract

An overlay display controller for making overlays such as a mouse cursor, a text cursor, a window moving frame, a window size alteration frame, or a range selection frame, acting as the mark of an operation or the content thereof, distinguishable easily from the peripheral pixels when various operations are performed in the system of a work station, a personal computer, or a word processor. The overlay display controller comprises means for determining the shape of an overlay displayed on a screen, and means for determining the position on the screen of a relevant overlay, wherein a predetermined constant is added to the pixel value for the pixel displayed on the screen at a part superposed by the overlay.

Description

Description Overlay display controller Technical field

The present invention relates to an overlay display control device, and particularly to a mouse cursor, a text cursor, a window moving frame, a window size changing frame, and a range, which are used as markers for the operation position and the operation contents in the operation of a workstation, a computer, a word processor, and the like. The present invention relates to a display control device for an overlay such as a selection frame. Background art

Conventionally, in order to satisfactorily identify the overlay display such as a mouse cursor, a text cursor, a window moving frame, a window size change frame and a range selection frame which are displayed on a background image displayed on a screen from the background image, a background is used. 2. Description of the Related Art There is known a display control device that displays a color of an overlay display portion where an image and a foreground image overlap with each other with an inverted color of a background color.

FIG. 17 is a block diagram for explaining a conventional overlay display control device.

In FIG. 17, the conventional overlay display control device includes an input device 1701 such as a mouse for moving an associated overlay display on the monitor screen by moving the operator, and a moving amount of the mouse. A moving amount detecting unit 1702 for detecting a moving amount in order to correspond to the movement of the overlay display on the monitor screen, a display position storing unit 1704, and a display position storing unit 1704 Display position determination unit 1703, which outputs the position moved by the amount of movement of the movement amount detection unit 1702 from the position of the upper left corner, which is the current display position of the overlay display, and the shape data of the overlay display 175, a display control unit 176, an image memory 178 that stores the pixel values of the image output on the monitor screen, and erasing the overlay display And the display controller 1 7 0 6 to update O to the pixel operation section 1 7 0 7 for taking out the image memory 1 7 0 8 forces et pixel based on the input of overlaps a background image and foreground image And a pixel inversion unit 1709 for inverting the background color of the display area. ,

Next, the operation of the overlay display control device having the above configuration will be described.

First, the moving amount detection unit 1702 detects the moving amount of the mouse. The detected movement amount is output to the display position determination unit 1703.

If the movement amount is not 0, the following series of drawing operations are performed to erase the overlay at the currently displayed position to rewrite the overlay position on the monitor screen. The display controller 1706 controls the screen update after confirming that the mouse movement amount is not 0. In order to update the screen, the display control unit 1706 outputs a display position storage unit 1704 that stores the current display position of the overlay, and a shape determination unit 1705 that outputs the overlay data. Is output to the pixel operation unit 1707. Then, the horizontal pixel X vertical pixel of the overlay shape determined by the shape determining unit 1705 with the current display position stored in the display position storage unit 1704 of the image memory 1708 as the upper left corner In the minute area, the pixel value of each color channel of the pixel to be superimposed on the overlay display is read into the pixel operation unit 1707, and the pixel inversion unit 1709 inverts the pixel value of the color channel. The overlay display is erased from the monitor screen by writing the inverted pixel value to the image memory 1708. Then, the overlay is drawn at the destination position. The display position determining unit 1703 determines the display position of the movement destination based on the current display position of the overlay stored in the display position storage unit 1704. Next, the output of the display position determination unit 1703, which outputs the position of the overlay display destination by the display control unit 1706, and the output of the shape determination unit 1705, which outputs the overlay display shape data Are output to the pixel operation section 1707. Then, in the image memory 1708, a pixel to be superimposed on the overlay display in an area corresponding to the horizontal pixels and the vertical pixels of the overlay shape determined by the shape determining unit 1705 with the destination overlay display position being the upper left corner. The pixel value of each color channel is read into the pixel operation unit 1707, and the pixel value of the color channel is inverted by the pixel inversion unit 1709. By writing the inverted pixel value to the image memory 178, overlay display of the destination is performed. And, for the next move, Update as current position.

The overlay shape data is represented by an area corresponding to horizontal pixels and vertical pixels, and a pixel for displaying the overlay in the area is determined. For example, assuming that the shaded portion in FIG. 3 is a 5 × 5 overlay, the overlay shape data corresponding to this is represented by binary values as shown in FIG. When the overlay shape data is “1” like the pixel 401 in FIG. 4 corresponding to the pixel 301 in FIG. 3, the overlay is displayed, and the pixel 302 in FIG. 3 is displayed. When the overlay shape data is “0” as in the pixel 402 shown in FIG. 4 corresponding to, the overlay display is not performed.

FIG. 5 is a diagram showing output characteristics of an overlay pixel value in a conventional overlay display control device.

If the background pixel value of the overlay display position is X, the pixel value of the overlay display part is y, the color channel of the pixel is 1 channel, and the quantization bit is 8 bits, the overlay pixel value is the inverse of the background pixel value, so _y = 2 5 5—X, resulting in the rough shown in 501. In order to make the state of the overlay pixel value relative to the background pixel value easier to understand, the graph 502 shows the background pixel value as y = x. At this time, for example, when a uniform screen with a luminance of 63 is displayed, the luminance of the overlay display is a value of 192 shown at the 503 position, and the difference between the peripheral pixels and the luminance shown at 504 is displayed. (Value of 129), the overlay display can be easily recognized.

However, in the above-described conventional overlay control display device, as shown in FIG. 5, the Darraf 502 indicating the background pixel value and the Darraf 501 indicating the overlay pixel value intersect. The background pixel value near where these two graphs intersect is about half of the maximum value, and the inverted pixel value, the overlay pixel value, is also near half of the maximum value, and the two pixel values are very close. Will be.

For example, when a uniform screen with a luminance of 127 is displayed, the luminance of the overlay display is a value of 128 shown at the 505 position, and the luminance shown by the arrow 506 compared to the surrounding pixels. In this case, there is a problem that the overlay display melts into the background image and is difficult to distinguish. -The present invention has been made to solve the above-described problems, and the pixel value of the background image displayed on the screen is always the same, regardless of the pixel value. It is an object of the present invention to obtain an overlay display control device for displaying a foreground image having the following. Disclosure of the invention

In order to solve the above-mentioned problems, an overlay display control device according to claim 1 of the present invention provides an overlay display that performs overlay display by superimposing a foreground image on a background image displayed on a screen. In the display control device, a display position determining unit that determines a display position of the foreground image; a shape determining unit that determines a shape of the foreground image; an image storage unit that stores pixel values of the background image; A pixel operation unit for extracting a pixel included in an area having a shape determined by the shape determination unit at a position determined by the display position determination unit in the background image stored in the storage unit; A predetermined constant is added to the pixel value of the background image extracted by the pixel operation unit, the added pixel value is sent to the image storage unit, and the pixel to be displayed on the screen as an overlay is displayed. And an adder.

According to the present invention, since the pixel value of each color channel of the background image at the position where the overlay display is performed is different from the pixel value of the overlay display, it is possible to obtain an overlay display image which is easily distinguishable from the peripheral image. Can be.

The overlay display control device according to claim 2 of the present invention is the overlay display control device according to claim 1, wherein the pixel addition unit overflows the quantization bit by adding the predetermined constant. In this case, the number of pixel gradations is subtracted from the pixel value in the case of the above, and the number of pixel gradations is added to the pixel value in the case of an underflow.

According to the present invention, even when the overlay pixel value overflows or underflows, the difference between the background pixel value and the overlay pixel value can be made to be more than a certain value by adding the above-mentioned predetermined constants, This makes it possible to obtain an overlay display image that is easily distinguishable from the peripheral image.

The overlay display control device according to claim 3 of the present invention is the overlay display control device according to claim 2, wherein the predetermined constant is a half of the number of pixel gradations. It is assumed that.

According to the present invention, the image of each color channel of the background image at the position where the overlay display is performed is provided. Regardless of the elementary value, the overlay pixel value can have a constant difference of half the value of the number of pixel gradations and the maximum difference. A separate overlay can be obtained.

An overlay display control device according to claim 4 of the present invention, wherein the overlay display control device performs overlay display by superimposing a foreground image on a background image displayed on a screen, A display position determining unit for determining a display position of the image, a shape determining unit for determining a shape of the foreground image, an image storage unit for storing pixel values of the background image, and a background stored in the image storage unit A pixel operation unit that extracts pixels included in an area having a shape determined by the shape determination unit at a position determined by the display position determination unit in the image; A pixel adding unit that adds a predetermined constant to the pixel value when the pixel value of the output background image is within a predetermined value range; and when the pixel value is out of the predetermined value range. Is on It is characterized in that example Bei pixel inversion section subtracting the pixel value from the maximum value of the pixel gray scale pixel value.

According to the present invention, regardless of the pixel value of each color channel of the background image at the position where the overlay is displayed, the pixel value of the overlay display is different, so that the overlay display image which can be easily distinguished from the surrounding image Can be obtained.

An overlay display control apparatus according to claim 5 of the present invention, wherein the overlay display control apparatus performs overlay display by superimposing a foreground image on a background image displayed on a screen. A display position determining unit for determining a position, a shape determining unit for determining a shape of the foreground image, an image storage unit for storing pixel values of the background image, and a background image stored in the image storage unit. And a pixel operation unit for extracting a pixel included in an area having a shape determined by the shape determination unit at a position determined by the display position determination unit, and a pixel operation unit extracting the pixel. When the pixel value of the background image is less than a predetermined threshold, the maximum value of the pixel gradation is given to the pixel. When the pixel value is equal to or more than the predetermined threshold, the pixel gradation is given to the pixel. A pixel processor that gives the minimum value, Ru der those comprising the.

According to the present invention, the image of each color channel of the background image at the position where the overlay display is performed is provided. Regardless of the elementary value, the overlay display image can be easily distinguished from the peripheral image because the pixel value of the overlay display is different.

The overlay display control device according to claim 6 of the present invention is the overlay display control device according to claim 5, wherein the predetermined threshold value is a half of the maximum value of the pixel gradation. It is a feature.

According to the present invention, no matter what the pixel value of each color channel of the background image at the position where the overlay is displayed, the pixel value of the overlay display has a difference of at least half the number of pixel gradations. As a result, it is possible to obtain an overlay display image that is easily distinguishable from the peripheral image.

The overlay display control device according to claim 7 of the present invention is the overlay display control device according to any one of claims 1 to 6, wherein: Is characterized in that the shape of the mouse cursor is created as the shape of the overlay.

According to the present invention, no matter what the pixel value of the background image at the position where the mouse cursor is displayed, the pixel value of the mouse cursor is different. it can.

The overlay display control device according to claim 8 of the present invention is the overlay display control device according to any one of claims 1 to 6, wherein: Is characterized in that the shape of a text cursor indicating the position at which a character is edited during text editing is created as an overlay shape.

According to the present invention, it is possible to obtain a text cursor that is easy to distinguish from the surrounding image because the pixel value of the text cursor is different regardless of the pixel value of the background image at the position where the text cursor is displayed. it can.

The overlay display control device according to claim 9 of the present invention is the overlay display control device according to any one of claims 1 to 6, wherein: Is characterized in that the shape of the window moving frame indicating the destination when moving the window is created as the overlay shape. According to the present invention, the pixel value of the background image at the position where the window moving frame is displayed is Even with such a value, since the pixel value of the window moving frame is different, it is possible to obtain an identification moving frame for the peripheral image.

The overlay display control device according to claim 10 of the present invention is the overlay display control device according to any one of claims 1 to 6, wherein Resize the window? ), The shape of the window size change frame indicating the size of the window after the change is created as the shape of the overlay.

According to the present invention, no matter what the pixel value of the background image at the position where the window size change frame is displayed, the pixel value of the window size change frame is different, so that the window size discriminating the surrounding image is small. A change frame can be obtained.

The overlay display control device according to claim 11 of the present invention is the overlay display control device according to any one of claims 1 to 6; The section is characterized in that a shape of a range selection frame indicating a range to be edited on the screen is created as an overlay shape.

According to the present invention, no matter what value the pixel value of the background image at the position where the range selection frame is displayed, the pixel value of the range selection frame is different, so that the range selection frame that is discriminated against the peripheral image is determined. Obtainable. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a diagram for explaining output characteristics of overlay pixel values according to Embodiments 1 and 4 of the present invention.

FIG. 2 is a block diagram for explaining an overlay display control device according to the first embodiment of the present invention. ,

FIG. 3 is a diagram showing a state of an overlay display drawn on a screen.

FIG. 4 is a diagram obtained by converting the overlay shape data shown in FIG. FIG. 5 is a diagram for explaining a conventional output characteristic of an overlay pixel value.

FIG. 6 is a flowchart showing a processing procedure of the overlay display control device according to the first embodiment of the present invention. FIG. 5 is a block diagram for explaining an overlay display control device according to Embodiment 2 of the present invention. ':

FIG. 8 is a flowchart showing a processing procedure of the overlay display control device according to the second embodiment of the present invention. -FIG. 9 is a diagram for explaining output characteristics of an overlay pixel value according to the second embodiment of the present invention.

FIG. 10 is a diagram for explaining a window moving frame displayed on a monitor screen according to Embodiment 3 of the present invention.

FIG. 11 is a block diagram for explaining an overlay display control device according to Embodiment 3 of the present invention.

FIG. 12 is a flowchart showing a processing procedure of the overlay display control device according to the third embodiment of the present invention.

FIG. 13 is a diagram for explaining output characteristics of an overlay pixel value according to the third embodiment of the present invention.

FIG. 14 is a diagram for explaining a window moving frame displayed on the monitor screen according to the fourth embodiment of the present invention.

FIG. 15 is a block diagram for explaining an overlay display control device according to Embodiment 4 of the present invention.

FIG. 16 is a flowchart showing a processing procedure of the overlay display control device according to the fourth embodiment of the present invention.

FIG. 17 is a block diagram for explaining a conventional overlay display control device. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described.

(Embodiment 1)

FIG. 2 is a block diagram for explaining an overlay display control device according to the first embodiment of the present invention. In the present embodiment, the shape of the overlay display is a mouse cursor. In FIG. 2, an overlay display control device according to Embodiment 1 of the present invention includes an input device 201 such as a mouse for moving an associated overlay display on a monitor screen by moving an operator, and a mouse movement. The movement amount detector 202 detects the movement amount in order to associate the amount with the movement of the overlay display on the monitor screen, the display position storage unit 204, and the display position storage unit 204 stores the movement amount. Display position determination unit 203 that outputs the position moved by the amount of movement of the movement amount detection unit 202 from the position of the upper left corner, which is the current display position of the overlay display, and the shape data of the overlay display , A display control unit 206, an image memory 208 storing the pixel values of the image output on the monitor screen, and erasing and updating the overlay display Display control unit for 2 A pixel operation unit 207 for extracting the image memory pixel 208 based on the input from the input unit 06, and a constant pixel previously given to the pixel value of the foreground image extracted by the pixel operation unit 207. And a pixel adder 209 for adding a value.

Next, the operation timing of the overlay display control device of the first embodiment will be described with reference to the flowchart of FIG.

FIG. 6 is a flowchart showing a processing procedure of the overlay display control device according to the first embodiment of the present invention.

In FIG. 6, first, in step S601, the amount of mouse movement is detected. Next, in step S602, if the movement amount detected in step S601 is 0, the operation returns to step S601 and the operation of movement amount detection is performed again. Therefore, if the mouse does not move, the operations of step S601 and step S602 are repeated. At this time, in FIG. 2, the movement amount detection unit 202 outputs to the display control unit 206 that the movement amount of the mouse is 0. The display control unit 206 does not output anything to the pixel operation unit 207 because the amount of mouse movement is 0 and there is no need to update the screen. Therefore, since the pixel operation unit 207 does not operate the pixels of the image memory 208, the screen remains as it is.

Next, in step S603 of FIG. 6, if the movement amount detected in step S601 is not 0, a Φ overlay display is displayed on the monitor screen in step S604 (in the first embodiment, the mouse To redraw the position of the (cursor) Performs a drawing operation to delete the mouse cursor at the position where the mouse cursor is located. At this time, in FIG. 2, the movement amount detection unit 202 outputs to the display control unit 206 that the movement amount of the mouse is not 0. Further, the movement amount detection unit 202 outputs the movement amount of the mouse to the display position determination unit 203. The display position determining unit 203 outputs the display position of the movement destination based on the current display position of the display position storage unit 204. The display control unit 206 controls the screen update because the mouse movement amount is not 0. In order to update the screen, the display control unit 206 outputs a display position storage unit 204 that stores the current display position of the mouse cursor, and a shape determination unit 205 that outputs mouse cursor shape data. Is output to the pixel operation unit 207.

Here, for example, it is assumed that the color channel of the pixel is one channel and the quantization bit is eight bits. Since one channel is 8 bits, the number of pixel gradations is 256, the minimum value of pixel gradation is 0, and the maximum value of pixel gradation is 255. The constant given in advance is 1 2 8. In the pixel operation unit 207, an area corresponding to the horizontal pixels and the vertical pixels of the overlay display determined by the shape determination unit 205 with the current display position stored in the display position storage unit 204 as the upper left corner. In, the pixel value of each color channel of the pixel to be superimposed on the mouse cursor is read into the pixel operation unit 207, and the pixel value obtained by adding the constant 128 given in advance by the pixel addition unit 209 is stored in the image memory 208. By writing the mouse cursor, the mouse cursor can be deleted from the monitor screen.

Next, in step S604 of FIG. 6, the mouse cursor is drawn at the destination position. At this time, the display control unit 206 in FIG. 2 includes an output of the display position determination unit 203 that outputs the position of the destination of the mouse cursor, and a shape determination unit 205 that outputs the shape data of the mouse cursor. Is output to the pixel operation unit 207. In the pixel operation unit 207, the image memory 208 was determined by the shape determination unit 205 with the display position determined by the display position determination unit 203 as the upper left corner. In the area of horizontal pixels X vertical pixels, the pixel value of each color channel of the pixel to be superimposed on the shape data where the mouse cursor exists is read into the pixel operation unit 207, and given in advance by the pixel addition unit 209. By writing the pixel value obtained by adding the constant 128 to the image memory 208, the mouse cursor at the destination can be displayed. If the pixel value exceeds 255 by the addition, the pixel gradation number of 256 is subtracted and 0 is interrupted. In case of underflow, add the pixel gradation number of 256.

For example, if the background pixel value to be superimposed on the mouse cursor is 1 2 9 and a given constant 1 2 8 is added, the overflow is 1 2 9 + 1 2 8 = 2 5 7, so that 2 5 6 2 5 7-2 5 6 = 1 obtained by subtracting is the pixel value of the mouse cursor.

Next, in step S605 of FIG. 6, the position to which the mouse cursor is moved is updated as the current position for the next movement. At this time, the display position control unit 206 in FIG. 2 outputs the output of the display position determination unit 203 that outputs the position of the mouse cursor to the display position storage unit 2 that stores the current position of the mouse cursor. 0 Write to 4. Next, after updating the current position in step S605 of FIG. 6, the process returns to before the detection of the movement amount in step S601, and detects the movement amount of the mouse again.

The operation of the pixel adder 209 which is a feature of the present invention will be described with reference to FIG. FIG. 1 is a diagram for explaining output characteristics of overlay prime values according to Embodiment 1 of the present invention.

In Fig. 1, the pixel value of the background image at the position where the mouse cursor is displayed is χ, the pixel value of the mouse cursor is y, the color channel of the pixel is 1 channel, the quantization bit is 8 bits, and the constant given in advance is the pixel value. When the value of half tone is 1 2 8, the mouse cursor pixel value becomes y = x + 1 2 8 which is obtained by adding a constant given in advance to the background pixel value, and the graph shown in 102 is obtained. . Graph 101 shows y = X where the background pixel value is directly used as the mouse cursor pixel value to make it easier to understand the state of the mouse cursor pixel value relative to the background pixel value. At this time, for example, when a uniform screen with a brightness of 127 is displayed, the brightness of the mouse cursor display is 255, which is shown at the 1 ° 3 position, and the ray value, and the background pixel and the 104 The mouse cursor can be easily recognized with respect to the surrounding pixels because of the difference in luminance (value of 128) shown in (1). In FIG. 1, since the constant given in advance is 128, the difference in luminance is constant at 128, which is half the number of pixel gradations.

As described above, in the overlay display control device according to the first embodiment, the pixel value of the overlay display (mouse cursor) is a value obtained by adding the constant 128 given in advance to the pixel value of the background image. However, no matter what the pixel value of the background image at the position where the mouse cursor is displayed, the pixel value of the mouse cursor is almost different. It is possible to obtain a mouse cursor that is easy to determine for the peripheral image.

When the constant given in advance is 1 28, which is half the value of the number of pixel gradations, the pixel value of the mouse force is always the same as the pixel value of each color channel of the background image. Can have a constant difference of 1 2 8 which is half the value of.

In the first embodiment, the color channel of the pixel is 1 channel, the quantization bit is 8 bits, and the predetermined constant is 128, but the color channel, the quantization bit, and the predetermined constant are arbitrary. The same can be performed with the value of.

Also, in the first embodiment, the case where the overlay display control using the mouse cursor is performed by a method of adding a predetermined constant to the pixel value of the portion where the overlay display is superimposed has been described. The embodiment shown by is only an example, and is not necessarily limited to this.

(Embodiment 2)

FIG. 7 is a block diagram for explaining an overlay display control device according to a second embodiment of the present invention. In this embodiment, the shape of the overlay display is a text cursor.

In FIG. 7, an overlay display control device according to the second embodiment includes an input device 711, such as a keyboard key, which is moved by a text cursor associated with the operator on a monitor screen, and a keyboard key. The movement amount detection unit 702 that detects the movement amount in order to associate the movement amount of the text cursor with the movement of the text cursor on the monitor screen, the display position storage unit 704, and the display position storage unit 704 A display position determination unit 703 that outputs a position moved by the movement amount detected by the movement amount detection unit 702 from the upper left corner position, which is the current display position of the remembered text cursor, and a horizontal pixel A shape determining unit 705 that outputs shape data of a text cursor represented by an area corresponding to X vertical pixels, a display position determining unit 703, a display position storage unit 704, a shape determining unit 705, and the like.入 Input of pixel operation section 707 Display control unit 706 for controlling the force, an image memory 708 for storing the pixel values of the image output on the monitor screen, and a display control unit 7 for erasing and updating the overlay display. A pixel operation unit 707 for extracting a pixel from the image memory 708 based on the input from the input unit 06, and the extracted pixel value is predetermined. A pixel adding unit 710 that adds a predetermined constant when the pixel value is within the range of the predetermined value, and a pixel gradation of the pixel value when the extracted pixel value is out of the predetermined value range. The pixel inverting unit 711 that subtracts the above pixel value from the maximum value of the image, and the image storage buffer 709 that stores the pixel value of the background image originally displayed at the position where the text cursor is currently displayed. It is constituted by.

Next, the operation timing of the overlay display control device having the above configuration will be described with reference to the flowchart of FIG.

FIG. 8 is a flowchart showing a processing procedure of the overlay display control device according to the second embodiment of the present invention.

In FIG. 8, first, in step S801, a predetermined amount of movement by keyboard typing is detected. At this time, the amount of movement of the text cursor placed between the texts or on the text varies depending on the editing device, so here the text cursor moves between characters arranged at regular intervals by typing the up, down, left, and right keys of the keyboard. Move by a fixed amount in the direction corresponding to the keys. This movement amount is output as the movement amount of the text cursor on the monitor screen. Next, in step S802, if the movement amount detected in step S801 is 0, the process returns to step S801 to perform the movement amount detection operation again. Therefore, when there is no keyboard tiling, the operations of step S801 and step S802 are repeated. At this time, in FIG. 7, the movement amount detection unit 702 outputs to the display control unit 706 that the detected movement amount is 0. The display control unit 706 does not output anything to the pixel operation unit 707 because the movement amount is 0 and there is no need to update the screen. Accordingly, the pixel operation unit 707 does not operate the pixels of the image memory 708, so that the screen remains unchanged. ','

Next, in step S802 of FIG. 8, if the movement amount detected in step S801 is not 0, in order to redraw the position of the text cursor on the monitor screen in step S803, First, a drawing operation is performed to delete the text cursor of the currently displayed level. At this time, in FIG. 7, the movement amount detection unit 702 outputs to the display control unit 706 that the detected movement amount is not 0. In addition, the movement amount detection unit 702 outputs the detected movement amount to the display position determination unit 703. Display position determination unit Reference numeral 703 outputs a destination display position based on the current display position of the display position storage unit 704. The display controller 706 controls the rain surface update because the movement amount is not 0. In order to update the screen, the display control unit 706 outputs the text cursor current output position from the display position storage unit 704 that stores the current display position, and the output of the text cursor shape data output unit 705 that outputs the shape data. Is output to the pixel operation unit 707. The image storage buffer 709 has a background image for the horizontal pixels and the vertical pixels of the shape determined by the shape determination unit 705 with the overlay display position stored in the display position storage unit 704 as the upper left corner. Is stored. The pixel operation unit 707 reads the background image stored in the image storage buffer 709 and stores it in the image memory 708 with the overlay display position stored in the display position storage unit 704 as the upper left corner. by ^writing: the text cursor can be erased from the monitor screen. · ·.

Next, in step S804 of FIG. 8, the back image at the destination position is stored in the image storage buffer 709. At this time, in FIG. 7, the display control section 706 outputs the output of the position of the text cursor to the display position determining section 703 and the shape determining section 770 which outputs the shape data of the text cursor. The output of 5 is output to the pixel operation unit 707. In the pixel operation unit 707, the shape determination unit 705 sets the display position of the moving destination determined by the display position determination unit 703 stored in the image memory 708 as the upper left corner, and is determined by the shape determination unit 705. By reading the background image for the horizontal pixels and vertical pixels of the shape and writing it to the image storage buffer 709, the background image at the position where the text cursor is displayed at the next update can be stored.

Next, in step S805 of FIG. 8, the text cursor is drawn at the position of the movement destination. At this time, in FIG. 7, in the image memory 708, the horizontal position of the shape determined by the shape determining unit 705 with the display position of the movement destination determined by the display position determining unit 703 as the upper left corner. From the area corresponding to the pixel X vertical pixels, the pixel value of each color channel of the pixel to be superimposed on the shape data of the text cursor is read into the pixel operation unit 707. If the read pixel value is within the predetermined value range, the value obtained by adding the constant given in advance by the pixel adder 7110 is written to the image memory 7108, and if the value is outside the above-mentioned predetermined value range. By writing the value obtained by subtracting the read pixel value from the maximum value of the pixel gradation by the pixel inverting unit 7111 into the image memory 708, the destination text cursor can be displayed. it can. If the pixel value overflows due to the addition, the pixel gradation number is subtracted. If the pixel value overflows, the pixel gradation number is added.

Next, in step S806 of FIG. 8, the position to which the text cursor is moved is updated as the current position for the next movement. At this time, in FIG. 7, the display position control unit 706 outputs the output of the display position determination unit 703 that outputs the position of the destination of the text cursor to the display position storage unit 70 that stores the current position of the text cursor. Write to 4.

Next, after the current position is updated in step S806 of FIG. 8, the process returns to before the movement amount detection in step S810, and the movement amount due to keyboard tying is detected again.

The operation of the pixel adder 710 and the pixel inverting unit 711 which is a feature of the present invention will be described with reference to FIG.

FIG. 9 is a diagram for explaining output characteristics of an overlay image value according to Embodiment 2 of the present invention.

In Fig. 9, the pixel value of the background image at the position where the text cursor is displayed is x, the pixel value of the text cursor is y, the color channel of the pixel is 1 channel, the quantization bit is 8 bits, and the constant given in advance is 1 2 8, The range of the predetermined value is 6 3 <X <19 2. The text cursor pixel value is the value obtained by subtracting the background pixel value from the maximum value of the pixel gradation when O x ≤ 63 or 19 2 x ≤ 255, where the background pixel value is out of the predetermined range. Therefore, y 2 25 5—X, and when the background pixel value is within the predetermined range, 6 4 ≤ x ≤ 1 91, 1 2 8 is added to the background pixel value, so y = x + 1 2 It becomes 8, which is a graph shown in 102. Text cursor with respect to background pixel value In order to make the state of the pixel value easier to understand, y = x where the background pixel value is the text cursor pixel value as it is is shown in graph 901. At this time, for example, when a uniform screen with a luminance of 31 is displayed, the luminance of the text cursor display is a value of 2 24 shown in the 90 3 position, and the luminance of the background pixel and the luminance of the 90 4 Since there is a difference (value of 193), the text cursor can be easily recognized with respect to surrounding pixels. As described above, in the overlay display control device according to the second embodiment, when the pixel value of the text cursor is within the range of the predetermined value, The pixel value of the text cursor is the value obtained by adding a predetermined constant to the pixel value of the background image.If the pixel value of the background image is out of the range of the predetermined value, the pixel value of the background image is calculated from the maximum value of the pixel gradation. Since the value obtained by subtracting is the pixel value of the text cursor, the pixel value of the background image at the position where the text cursor is displayed is significantly different from the pixel value of the text cursor. It is possible to obtain a text cursor that is easy to distinguish from the surrounding image.

In the second embodiment, the overlay display control using the text cursor is performed by adding a predetermined constant to the pixel value of the portion where the overlay is superimposed, the pixel value from the maximum value of the gradation, and the pixel value of the background image. Has been described, but the embodiment shown here is merely an example, and the present invention is not necessarily limited to this.

(Embodiment 3)

FIG. 10 is a diagram for explaining a window moving frame displayed on a monitor screen according to Embodiment 3 of the present invention. ''

In FIG. 10, reference numeral 1001 denotes a window, and a rectangular frame 1002 denotes a destination window moving frame. The window moving frame is represented by a rectangular frame that includes the upper left corner position 1003 and the lower right corner position 1004 as diagonal vertices. Window ゥ The movement frame appears when you click the window movement start portion 106 of the window with the mouse cursor 1005 and move it while dragging, indicating the destination of the window.

FIG. 11 is a block diagram for explaining an overlay display control device according to a third embodiment of the present invention.

In FIG. 11, an overlay display control apparatus for a window moving frame according to the third embodiment monitors an associated window moving frame by an operator clicking a window moving start portion and moving while dragging. The input depth of the mouse or the like to be moved on the screen 1 1 0 1 and the movement amount of the mouse on the monitor screen are detected. The movement amount of the mouse is detected to correspond to the movement of the window moving frame, and this value is displayed on the monitor screen. Movement amount detection unit 1 1 0 2 that outputs as the movement amount of the window movement frame of A display position storage unit 1104, and a position moved by the movement amount detected by the transfer amount detection unit 1102 from the position of the upper left corner which is the current display position of the window movement frame stored in the display position storage unit 1104 Display position determining unit 1103, which outputs the shape data of a window moving frame represented by an area of horizontal pixels and vertical pixels having the same size as the window ゥ size, and a shape determining unit 1105 for outputting the data, and a display position determining unit A display control unit 1106 for controlling input / output of a unit 1103, a display position storage unit 1104, a shape determination unit 1105, and a pixel operation unit 1107; an image memory 1108 for storing pixel values of an image output on a monitor screen; A pixel operation unit 1107 for extracting pixels from the image memory 1108 based on the input from the display control unit 1106 to erase and update the window moving frame, and a window moving frame among the pixels displayed on the screen But A pixel processing unit 1111 that gives the pixel of the maximum or minimum pixel gradation based on the pixel value to the pixel of the portion to be folded, and the pixel processing unit 1111 that is originally displayed at the position where the window moving frame is currently displayed. The image storage buffer 1109 that stores the background image and the upper left corner that is the current display position of the window held by the system of the entire device are output to the display position storage unit 1104, and the window size is output. And a system information output unit 1110 that outputs the information to the shape determination unit 1105.

Next, the operation timing of the overlay display control device of the third embodiment having the above configuration will be described with reference to the flowchart of FIG.

FIG. 12 is a flowchart showing a processing procedure of the overlay display control device according to the third embodiment of the present invention. '. _f

In FIG. 12, first, in step S1201, when the window movement start portion is clicked with the mouse, system information on the window is acquired from the system of the entire apparatus. At this time, in FIG. 11, the system information output unit 1110 outputs the position of the upper left corner, which is the current display position of the window held by the system, to the display position storage unit 1104, and determines the size of the window. Output to section 1105. The shape determining unit 1105 creates shape data of a window frame in a region corresponding to the vertical pixels and the horizontal pixels of the window size acquired from the system information output unit 1110, and outputs it to the display control unit 1106. . Next, in step S1202 in FIG. 12, the movement amount of the mouse is detected. In step S1203, if the movement amount detected in step S1202 is 0, the operation returns to step S1202 to perform the movement amount detection operation again. Therefore, if there is no movement of the mouse, the operations of step S1202 and step S1203 are repeated. At this time, in FIG. 11, the movement amount detection unit 1102 outputs to the display control unit 1106 that the movement amount of the mouse is 0. The display control unit 1106 does not output anything to the pixel operation unit 1107 because the movement amount of the mouse is 0 and there is no need to update the screen. Therefore, since the pixel operation unit 1107 does not operate the pixels of the image memory 1.108, the screen remains unchanged.

Next, in step S1204 in FIG. 12, if the movement amount detected in step S1203 is not 0, firstly, the position currently displayed is displayed in order to redraw the position of the window moving frame on the monitor screen. Performs a drawing operation to delete the window moving frame. At this time, in FIG. 11, the movement amount detection unit 1102 outputs to the display control unit 1106 that the movement amount of the mouse is not 0. Also, the movement amount detection unit 1102 outputs the movement amount of the mouse to the display position determination unit 1103. The display position determining unit 1103 outputs the display position of the movement destination based on the current display position of the display position storage unit 1104. The display control unit 1106 controls the screen update because the mouse movement amount is not 0. In order to update the screen, the display control unit 1106 outputs the output of the display position storage unit 1104 that stores the current display position of the win: do moving frame, and the output of the shape determining unit 1105 that outputs the shape data of the window moving frame. Is output to the pixel operation unit 1107. In the image storage buffer 1109, the display position stored in the display position storage unit 1104 of the image memory 1108 is set as the upper left corner, and the size of the shape data of the shape determination unit 1105 is added to the position of the upper left corner. A background image for horizontal pixels and vertical pixels surrounded by a rectangle whose diagonal vertex is the lower right corner is stored. The pixel operation unit 1107 reads the background image stored in the image storage buffer 1109, and writes the background image in the area of the image memory li08 with the display position of the display position storage unit 1104 at the upper left corner, thereby moving the window moving frame. Can be deleted from the monitor screen. Next, in step S1205 in FIG. 12, the background image at the destination position is stored in the buffer. At this time, the display control unit 1106 in FIG. The output of the display position determining unit 1103, which outputs the position of the destination of the moving frame, and the output of the shape determining unit 1105, which outputs the shape data of the window moving frame, are output to the pixel operation unit 1107. I do. In the pixel operation unit 1107, the display position stored in the image memory 1108 and the display position determined by the display position determination unit 1103 is set to the upper left corner of the destination window. Reads the background image of horizontal pixels X vertical pixels surrounded by a rectangle that is the diagonal vertex of the lower right corner at the position where the vertical and horizontal sizes of the shape data of the shape determiner 1 1 0 5 are added, and saves the image By writing to the buffer 1109, the background image at the position where the window moving frame required for the next update is displayed can be saved.

Next, in step S122 of FIG. 12, a window moving frame is drawn at the destination position. At this time, in FIG. 11, the pixel operation unit 1107 is located next to the shape determination unit 1105 in the image memory 111, where the display position of the display position determination unit 1103 is the upper left corner. In the area corresponding to the pixel X vertical pixels, the pixel value of each color channel of the pixel to be superimposed on the shape data existing in the window moving frame is read into the pixel operation unit 1: 107, and if the pixel value is smaller than the predetermined threshold value, Then, the pixel processing unit 1 1 1 1 writes the maximum value of the pixel gradation into the above-mentioned pixel into the plane image memory 1 1 108, and if the pixel value is equal to or larger than the preset threshold value, the pixel processing unit 1 1 1 1 By writing the minimum value of the pixel gradation in the pixel into the image memory 1 108, the window movement frame of the movement destination can be displayed. Next, in step S127 of FIG. 12, the position of the destination of the window moving frame is updated as the current position for the next movement. At this time, the display position control unit 1106 in FIG. 11 uses the output of the display position determination unit 1103, which controls the destination position of the window moving frame, to determine the current position of the window moving frame. Write to the display position storage unit 1104. ::

Next, after the current position is updated in step S1207 in FIG. 12, the process returns to before the movement amount detection in step S1221, and the movement amount of the mouse is detected again.

The operation of the pixel processing unit 111, which is a feature of the present invention, will be described with reference to FIG.

FIG. 13 is a diagram for explaining output characteristics of an overlay pixel value according to the third embodiment of the present invention. , In Fig. 13, the pixel value of the background image at the position where the window moving frame is displayed is X, the pixel value of the window moving frame is y, the color channel of the pixel is 1 channel, and the quantization bit is 8 bits. Let the given threshold be 17.5. When the background pixel value is 0 ^ x ^ 1 27, the pixel processing unit 1 1 1 1 1 gives the maximum value of the pixel gradation 255 and the background pixel value is 1 28 In the case of ≤ 5≤2 255, the minimum value 0 of the pixel gradation is given. Then, the graph shown in 1302 is obtained. In order to make it easier to understand the state of the window moving frame pixel value with respect to the background pixel value, graph 1301 shows y = x where the background pixel value is used as the window moving frame pixel value. 'At this time, for example, if a uniform screen with a brightness of 127 is displayed, the brightness of the window moving frame will be a value of 255 shown at the 1303 position, and the background pixel and 1,3 Since there is a luminance difference (value of 128) shown in 04, it is possible to easily recognize the window movement frame with respect to peripheral pixels. In addition, in FIG. 13, the threshold value is 1 / 27.5 which is half of the maximum value of the pixel gradation, so that the difference in luminance is at least 1/28 which is half the number of pixel gradations.

As described above, in the overlay display control device according to the third embodiment, when the pixel value of the window moving frame is smaller than the threshold value given in advance, the maximum value of the pixel gradation is changed to the window moving frame. If the pixel value of the background image is equal to or greater than a predetermined threshold value, the minimum value of the pixel gradation is set to be the pixel value of the window moving frame. Whatever the pixel value is, it is different from the pixel value of the window moving frame, so that a window moving frame that can be easily distinguished from the peripheral image can be obtained.

When the threshold value given in advance is set to half of the maximum value of the pixel gradation, the pixel value of the window moving frame is always equal to or more than half of the pixel gradation number with respect to the pixel value of each color channel of the background image. You can make a difference.

In the third embodiment, the overlay display control using the window moving frame is performed by giving a maximum pixel gradation value or a minimum pixel gradation value to a pixel value of a portion where the overlay display is superimposed. Although the embodiment has been described above, the embodiment shown here is merely an example, and is not necessarily limited to this. (Embodiment 4)

FIG. 14 is a diagram for explaining a window size change frame displayed on the monitor screen according to the fourth embodiment of the present invention.

In FIG. 14, reference numeral 1401 denotes a window, and a rectangular frame 1402 denotes a window size change frame. The window size change frame 1402 is represented by a square frame including the end point position 144 which forms a diagonal vertex with the start point position 1403. Window ゥ The resizing frame 1 4 0 2 is as follows. While moving, the end point 1444 moves, and accordingly, a rectangular frame containing two points as diagonal vertices appears, and the size of the rectangular frame indicates the window size after the change.

FIG. 15 is a block diagram for explaining an overlay display control device according to the fourth embodiment of the present invention.

In FIG. 15, the overlay display control device according to the fourth embodiment displays an associated window movement frame on the monitor screen by an operator clicking a window size change start portion and moving the window while dragging. Input device such as a mouse to be enlarged or reduced by 1501 and movement of the mouse movement to the end point position on the monitor screen. The movement amount is detected to correspond to the movement, and this value is used as the end point on the monitor screen. Movement amount detection unit 1502 that outputs as the movement amount of the position, end point position storage unit 1504, and current end point position of the window size change frame stored in the end point position storage unit 1504 And an end point position determination unit 1503 that outputs the position moved by the movement amount detected by the movement amount detection unit 1502, and the shape data of the window size change frame is created and output. 0 5 and end position Display that controls the input / output of the position determination unit 1503, the end point position storage unit 1504, the shape determination unit 1505, the pixel operation unit 15007, and the system information output unit 15009. A control unit 1506 and a pixel operation unit that extracts pixel values from the image memory 1508 based on input from the display control unit 1506 to delete and update the window size change frame 1507, a pixel addition section 1505 for adding a predetermined constant pixel value to the pixel value of the foreground image extracted by the pixel operation section 1507, and a pixel addition section 1505 for the image output on the monitor screen. An image memory 1508 that stores pixel values, A system information output unit 1509 for outputting information held by the system.

Next, the operation timing of the overlay display control device of the fourth embodiment having the above configuration will be described with reference to the flowchart of FIG.

FIG. 16 is a flowchart showing a processing procedure of an overlay display control device according to the fourth embodiment of the present invention.

In FIG. 16, first, in step S 1601, when the window size change start part is clicked with the mouse, the system information output unit 1509 outputs two pieces of information held by the system. . If the part clicked by the mouse is the window resizing start part located in the lower right corner of the window, the position of the upper left corner of the currently displayed position of the window is output to the shape determination unit 1505 as the starting point. Then, the position of the lower right corner of the currently displayed position of the window is output to the end point position storage unit 1504 as the end point position. , ', ；

Next, in step S1602 of FIG. 16, the amount of movement of the mouse is detected. In step S1603, if the movement amount detected in step S1662 is 0, the operation returns to step S1662 to perform the operation of the reproduction movement amount detection. Therefore, if there is no movement of the mouse, the operations of step S1662 and step S1663 are repeated. At this time, in FIG. 15, the movement amount detection unit 1502 outputs to the display control unit 1506 that the movement amount of the mouse is 0. The display control unit 1506 does not output anything to the pixel operation unit 1507 because the mouse movement amount is 0 and the screen does not need to be updated. Therefore, the pixel operation unit 1507 is the image memory 150? The screen remains as it is because no pixel is operated. '

Next, in step S1664 of FIG. 16, if the movement amount detected in step S1663 is not 0, first, in order to redraw the window size change frame on the monitor screen, Performs a drawing operation to delete the currently displayed window size change frame. At this time, in FIG. 15, the movement amount detection unit 1502 outputs to the display control unit 1506 that the movement amount of the mouse is not 0. Further, the movement amount detection unit 1502 outputs the movement amount of the mouse to the end point position determination unit 1503. The end point position determining unit 1503 outputs the destination end position based on the current end point position in the end point storage unit 1504. Power. The display control unit 1506 controls the screen update because the mouse movement amount is 0. First, in the display control unit 1506, the end point position is determined by moving the mouse, so that the output of the end point position determination unit 1503 is output to the shape determination unit in order to create the shape data of the window size change frame. Output to 1505. The shape determining unit 1505 diagonally sets two points, the start point position obtained from the system information output unit and the end point position of the end point position storage unit 1504, stored in the image memory 1508. In the area of vertical pixels X horizontal pixels included as vertices, shape data of the window size change frame is created and output to the display control unit 1506. Next, the display control unit 1506 updates the screen by updating the start point position obtained from the system information output unit 1509 and the end point position storage unit storing the current end point position of the window size change frame. The output of 1504 and the output of the shape determination unit i505 that outputs the shape data of the window size change frame are output to the pixel operation unit 1507. The pixel operation unit 1507 pairs the two points stored in the image memory 1508, the start point position acquired by the display control unit 1506 and the end point position of the end point position storage unit 1504. The pixel value of each color channel of the pixel to be superimposed on the shape data in which the window size change frame exists is read in the area of horizontal pixels X vertical pixels of the window size change frame shape data included as corner vertices, and the pixel addition unit 15 The window size change frame can be deleted from the monitor screen by writing the pixel value obtained by adding the constant given by 10 in advance to the image memory 1508. If the pixel value overflows due to the addition, the number of pixel gradations is subtracted. If the pixel value underflows, the number of pixel gradations is added. '·':;

Next, in step S165 of FIG. 16, a window size change frame is drawn at the destination position. At this time, in FIG. 15, the display control unit 1506 includes an end point position determining unit that outputs the start point position obtained from the system information output unit 1509 and the end point position after the window size change frame is changed. The output of 1503 and the output of the shape determination unit 1505 that outputs the shape data of the window size change frame are output to the pixel operation unit 1507. In the pixel operation unit 1507, two points, the start point position and the end point position of the end point position determination unit 1503, which are stored in the image memory 1508 and acquired by the display control unit 1506, are used. In the area of horizontal pixels X vertical pixels of the window size change frame shape data included as diagonal vertices, overlap with the shape data where the window size change frame exists The pixel value of each color channel of the pixel is read into the pixel operation unit 1507. By drawing the pixel value obtained by adding the above given constant in the pixel adding section 15010 into the image memory 1508, the window size change frame after the change can be displayed. If the pixel value overflows due to the addition, the number of pixel gradations is subtracted. If the pixel value underflows, the number of pixel gradations is added. -Next, in step S166 of FIG. 16, the end point position after the window size change frame is changed is updated as the current end point position for the next enlargement or reduction. At this time, in FIG. 15, the display control unit 1506 outputs the output of the end point position determination unit 1503 that outputs the end point position after the window size change frame is changed to the current end point of the window size change frame. The current end point position can be updated by writing to the end point position storage section 1504 for storing the position.

Next, after updating the current end point position in step S166 of FIG. 16, the process returns to the detection of the movement amount in step S1661, and detects the movement amount of the mouse again. . The operation of the pixel adder 1510, which is a feature of the present invention, will be described with reference to FIG. The pixel value of the background image at the position where the window moving frame is displayed is x, the window 画素 The pixel value of the moving frame is y, the color channel of the pixel is 1 channel, the quantization bit is 8 bits, and the constant given in advance is 1 2 8 In this case, the window moving frame pixel value becomes y == x + 1 28 obtained by adding a constant given in advance to the background image and the prime value, and the graph shown in 102 is obtained. In order to make it easy to understand the state of the window moving frame pixel value for the background pixel Shari, the background pixel value is shown as y = x in the graph 101 as the window moving frame pixel value. At this time, for example, if a uniform screen with a luminance of 127 is displayed, the luminance of the window moving frame display is a value of 255 shown at the 103 position, and the background pixel and 104 Since there is a difference in luminance (value of 128), the window movement frame can be easily recognized with respect to peripheral pixels. Further, in FIG. 1, the constant given in advance is set to 128, which is half the value of the number of pixel gradations, so that the difference in luminance is constant at 128, which is half the value of the number of pixel gradations.

As described above, in the overlay display control device according to the fourth embodiment, the pixel value of the window size change frame is set to a value obtained by adding a constant given in advance to the pixel value of the background image. The pixel value of the background image at the position where the frame is displayed However, since the pixel value of the window size change frame is different even if the value is as described above, it is possible to obtain a window size change frame that is easily distinguishable from the peripheral image. If the constant given in advance is half the value of the number of pixel gradations, the pixel value of the window size change frame is always half the value of the number of pixel gradations for the pixel value of each color channel of the background image. Can be given a certain difference.

In the fourth embodiment, the case has been described where overlay display control using the window size change frame is performed by a method of adding a predetermined constant to the pixel value of the portion where the overlay display is superimposed. However, the embodiment shown here is merely an example, and is not necessarily limited to this.

Further, in the fourth embodiment, only the display control of the window size change frame displayed on the monitor screen has been described. However, this can be similarly performed for the display control of the range selection frame displayed on the monitor screen. . Industrial applicability

As described above, the overlay display control device according to the present invention is suitable for the overlay display device that makes the overlay display distinct from the background image.

Claims

The scope of the claims

1. An overlay display control device that performs overlay display by superimposing a foreground image on a background image displayed on a screen,

A display position determining unit that determines a display position of the foreground image;

A shape determination unit that determines the shape of the foreground image;

An image storage unit that stores a pixel value of the background image,

A pixel for extracting a pixel included in an area having a shape determined by the shape determining unit at a position determined by the display position determining unit in the background image stored in the image storage unit. An operation unit,

A pixel adding unit that adds a predetermined constant to the pixel value of the background image extracted by the pixel operation unit, sends the added pixel value to the image storage unit, and displays an overlay on the screen. Was

An overlay display control device, characterized in that: ―

2. In the overlay display control device according to claim 1,

The pixel addition unit subtracts the number of pixel gradations from the pixel value when the quantization bit overflows by the addition of the previously given constant, and the pixel gradation number when the underflow occurs. Add,

An overlay display control device, characterized in that:

3. The overlay display control device according to claim 2,

The above given constant is a half value of the number of pixel gradations,

An overlay display control device, characterized in that:

4. In an overlay display control device that performs overlay display by superimposing a foreground image on a background image displayed on a screen,

A display position determining unit that determines a display position of the foreground image;-a shape determining unit that determines a shape of the foreground image;

An image storage unit that stores a pixel value of the background image,

In the background image stored in the image storage unit, the position determined by the display position determination unit is included in an area having a shape determined by the shape determination unit. A pixel operation unit for extracting a pixel

A pixel addition unit that adds a predetermined constant to the pixel value when the pixel value of the background image extracted by the pixel operation unit is within a predetermined value range;

A pixel inverting unit that subtracts the pixel value from the maximum value of the pixel gradation of the pixel value when the pixel value is out of the predetermined value range,

An overlay display control device, characterized in that: .

5. In an overlay display control device that performs overlay display by superimposing a foreground image on a background image displayed on a screen,

A shape determination unit that determines the shape of the foreground image;

An image storage unit that stores a pixel value of the background image,

When the pixel value of the background image extracted by the pixel operation unit is less than a predetermined threshold value, the maximum value of the pixel gradation is given to the pixel, and when the pixel value is equal to or more than the predetermined threshold value, And a pixel processing unit for giving a minimum value of a pixel gradation to the pixel.

6. The overlay display control device according to claim 5,

The threshold given in advance is half the maximum value of the pixel gradation,

An overlay display control device, characterized in that:

7. The overlay display control device according to any one of claims 1 to 6, wherein:

The overlay display control device, wherein the shape determining unit creates a mouse cursor shape as an overlay shape.

8. The overlay display control device according to any one of claims 1 to 6, wherein:

The shape determination unit creates a shape of a text cursor indicating a position at which a character is edited at the time of text editing as an overlay shape, An overlay display control device, characterized in that:

9. The opaque display control device according to any one of claims 1 to 6, wherein:

The shape determining unit creates a shape of a window moving frame indicating a destination when moving the window as an overlay shape.

An overlay display control device, characterized in that:

10. The overlay display control device according to any one of claims 1 to 6, wherein:

The above-mentioned shape determination unit, when changing the size of the window, creates, as an overlay shape, the shape of a window size change frame indicating the size of the window 変更 after the change. .

11. The overlay display control device according to any one of claims 1 to 6, wherein:

The shape determination unit creates a shape of a range selection frame indicating a range to be edited on the screen as an overlay shape,

An overlay display control device, characterized in that: