JP2003099027A - Image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To actualize an image display device which can paint out and display an area even when part or the whole of the boundary line of the area to be painted out is outside a display area. SOLUTION: A raster scanning type image display device which scans and reads out the contents of a display memory and displays an image at display part while painting out the inner side of its boundary line is equipped with an image memory which stores image data of the image, a painting-out line drawing part which computes the coordinates of drawing pints forming the boundary line, and writes the image data to an image memory corresponding to coordinates when the coordinates are inside the display area or writes the image data to an image memory corresponding to the left end of the display area at the same y coordinate when the calculated x coordinate of the drawing point is on the left side of the display area, and a painting-out process part which stores the display data in a display memory according to the image data written to the image memory.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a raster scanning type image display device which scans and reads out the contents of a display memory, and fills and displays the boundary line of an image to be displayed on a display section.

[0002]

2. Description of the Related Art For example, in a map display device as an image display device mounted on an aircraft, map information that needs to be filled, such as a river or lake, is filled and displayed on a display screen. .

FIG. 4 is a block diagram of an image display device for performing a conventional filling process. In FIG. 4, 11 is a paint line drawing unit, 12 is an image memory, 13 is a paint processing unit, 14 is a display memory, and 15 is a display unit.

The filled-line drawing unit 11 draws a plurality of vectors forming the boundary line of the image to be displayed, calculates the drawing point which is the starting point of the vector and the coordinates of the drawing point in the vector, and calculates them. The attribute is determined and stored as image data in the image memory 12. This attribute data is data for identifying the drawing points at both ends in the scanning line and other drawing points.

Then, the fill processing unit 13 scans the image memory 12 to read out the image data, and displays the display data for identifying the on / off of each pixel of the display unit 15 consisting of a plurality of pixels based on the attribute thereof. It is stored in the memory 14 for use. Then, the display unit 15 turns on and off each image based on the display data stored in the display memory 14, and displays the image in a filled-in manner.

FIG. 5A is a diagram showing a state in which an image to be displayed is filled and displayed in the display area, and FIG. 5B illustrates the filled display of the image shown in FIG. 5A. FIG. 1 to 8 in FIG.
Is a starting drawing point of the first to eighth vectors (not shown) forming the boundary line, 1a and 1b are drawing points in the first vector, 2a is drawing points in the second vector, 4a,
4b is a drawing point in the fourth vector, 5a is a drawing point in the fifth vector, 7a is a drawing point in the seventh vector, and 8a.
8e are drawing points in the eighth vector.

The drawing order of drawing points is 1 → 1a →
1b → 2 → 2a → 3 → 4 → 4a → 4b → 5 → 5a → 6 →
7 → 7a → 8 → 8a → 8b → 8c → 8d → 8e.

FIG. 6 is a flow chart for explaining the operation of the fill line drawing section of the conventional image display device. In FIG. 6, first, in step (hereinafter, referred to as ST) 1, the filling line processing unit activates a drawing command, and FIG.
The coordinates (x, y) of the drawing point 1 which is the starting point of the first vector in are calculated.

Next, in ST2, it is judged whether the y coordinate of the drawing point 1 is inside or outside the display area.
In 3, it is determined whether the x coordinate of the drawing point 1 is inside or outside the display area.

Since x is in the display area, S
At T4, it is determined whether the first vector has a new y coordinate value. In this case, since the y coordinate of the drawing point 1 is new, the attribute "Single" is written in the corresponding image memory (x, y) in ST5a.

Next, in ST6, it is judged whether or not it is the end point of the drawing point in the first vector. Since it is not the end point, in ST7 the process moves to the next drawing point in the first vector, and in ST8 the The coordinates of the drawing point 1a in one vector are calculated, and the process returns to ST2.

Since both the x-coordinate and the y-coordinate of the drawing point 1a are within the display area, it is determined in ST4 whether the value is a new y-coordinate value in the first vector. In this case, since the drawing point 1a is a new y coordinate different from the drawing point 1, the attribute "Single" is written in the image memory corresponding to the drawing point 1a in ST5a.

Since the drawing point 1a is not the end point of the drawing point in the first vector, the drawing point 1a is moved to the drawing point next to the first vector in ST7, and the coordinates of the next drawing point 1b are calculated in ST8. Similar to the above, in ST4, it is determined whether the first vector is a new y coordinate value. in this case,
Since the drawing point 1b is the second drawing point having the same y coordinate as the drawing point 1a, the attribute "Do" is stored in the image memory in ST5b.
Write "uble".

Since the drawing point 1b is the end point of the drawing point in the first vector in ST6, the process proceeds to ST9, and it is determined whether or not the vector start drawing point 1 is the end point of the vector start drawing point. Since the vector start drawing point 1 is not the end point, in ST10, it moves to the drawing point which becomes the starting point of the next second vector, and in ST1, the coordinates of the drawing point 2 which becomes the starting point of the second vector are calculated. To do.

In the above-mentioned operations from ST1 to ST10, the drawing points are 1 → 1a → 1b → 2 → 2a → 3 → 4 → 4a → 4b.
→ 5 → 5a → 6 → 7 → 7a → 8 → 8a → 8b → 8c → 8
The attribute is stored in the image memory corresponding to the drawing points (drawing points in the same vector as the starting point of the vector) forming all the boundaries by repeating the sequence of moving from d to 8e.

In this case, the attributes stored in the drawing points are the drawing points 1, 1a, 2, 3, 4, 5, 6, 7, 7a, 8, and 8.
a, 8c become "Single", and drawing points 1b, 2
a, 4a, 4b, 5a, 8b, 8d, 8e are "Doub
le ", that is," S "is drawn at the drawing points at both ends in the scanning line.
"ingle" attribute is given, and other drawing points are "
"Double" is given, and the attribute data is stored so that the drawing points at both ends in the scanning line and other drawing points can be distinguished from each other.

Although all the drawing points are within the display area in FIG. 5B, when it is determined in ST2 of FIG. 6 that the y-coordinates of the drawing points are outside the display area, FIG.
If it is determined in ST3 that the x coordinate of the drawing point is outside the display area, the attribute is not written in the image memory.

FIG. 7 is a flow chart for explaining the operation of the fill processing section of the conventional image display device. The fill processing unit sequentially scans the image memory from the upper left corner of FIG. 5B in the right direction to read the contents, and when one scan line is completed, moves to the left corner of the scan line below and moves its operation. By repeatedly scanning the image memories on all the scanning lines from the top to the bottom in the display area, the image data is read.

In FIG. 7, first, in ST21, the fill processing section reads the image data stored in the image memory at the scanning start point (upper left corner of the display area), and in ST22, determines the type of the attribute. And the attribute is "Double
In the case of "e" and "Single", the display data "ON" is written in the display memory of the same coordinates in ST23.

If the attribute is blank (coordinates not on the boundary line), it is judged in ST24 whether the position of the image memory is inside or outside the boundary line. If it is inside, an image on the same scanning line (same y coordinate) is calculated in ST25. Data "Single"
It is determined whether the number of attributes of is an odd number or an even number.

If it is an odd number, it is determined in ST26a that it is within the filled area, so "ON" is written as display data in the display memory, and if it is an even number, it is determined in ST26b that it is outside the filled area. Write "off" because it will be done.

Next, in ST27, the scanning line end point (x end point,
If it is not the end point, it is determined in ST28 whether the display area is at the right end of the display area. In ST28, the image is moved to the next (right adjacent) image memory next to the same y-coordinate (same scan line), and (x + 1) or less is displayed for the end point of the scan line Write to the memory.

If it is determined in ST27 that the scanning line is the end point, it is determined in ST29 whether the y end point (the bottom of the display area) is, and if it is not the end point, ST30 is set.
At, move to the next y coordinate (next scan line) (y +
1), and then move the x and y coordinates to ST21 to ST
The operation of 30 is repeated to write the display data to all the display memories in the display area.

In the case of FIG. 6 (b), the image memory in the third scanning line from the top and the drawing point 8c in the fourth scanning line from the top are all "Blank" and the boundary line Since they are outside, the contents of the display memory corresponding to them are "off".

The attribute of the drawing point 8c is "Single."
Since it is "e", it is "on", and the attributes of the drawing points 8d and 8e are "Do"
Since it is “double”, it is “on”, and since the attribute of the image memory on the right of the drawing point 8e is “Blank” within the boundary line, the image data on the same scanning line (same y coordinate) in ST25 of FIG. The number of "Single" s in the above is odd or even. In this case, "Single" is determined.
Since e ″ is one point (odd number) of the drawing point 8c, the drawing point 8c
"ON" is stored in the display memory on the right of e, and "ON" is similarly stored up to the drawing point 1.

By repeating the same operation,
The attributes "Single" and "Double" are stored in the image memory to form a boundary line, and the attributes are not written in the image memory within all the boundary lines and "Blan"("Blan").
“On” is written in all the display memories of k ”), and“ off ”is written in all the display memories outside the boundary line.

After the above-described operation, the display memory is scanned by the field programmable gate array (not shown) to read the display data, and the drawing points and the drawing points forming the boundary line based on the content of the read display data. The pixels within the boundary line are turned on (lighted) and the other pixels are turned off (lighted off), and the image is displayed in black as shown in FIG. 6A.

[0028]

However, in the above-described image display device, when a part of drawing points forming a boundary line is outside the display area, the starting point (left end) and the end point (left end) of the filling at the time of scanning. There was a problem that the (right end) could not be found and the filling was not executed normally. In particular, when the starting point (left end) is outside the display area, the filling is not started, and the filling starts from the original filling end point (right end), which poses a problem that there are restrictions on the image that can be drawn.

The present invention has been made in order to solve the above-mentioned problems, and even if a part or all of the boundary line of the fill is outside the display area, the fill display can be performed, and there is no restriction on the image to be drawn. It is an object of the present invention to realize an image display device capable of

[0030]

According to a first aspect of the present invention, the contents of the display memory corresponding to the display area are scanned by storing display data for identifying ON / OFF of a plurality of pixels forming the display section. In a raster scanning type image display device that reads out and displays the boundary line of an image to be displayed on the display unit by filling in the boundary line, an image memory that stores image data of the image and a drawing point that forms the boundary line. If the coordinate is calculated, and the coordinate is within the display area, the image data is written in the image memory corresponding to the coordinate, and if the calculated x coordinate of the drawing point is off the left side of the display area, the same y coordinate is used. A fill line drawing unit that writes image data to the image memory corresponding to the left end of the display area, and a display device that displays data in the display memory based on the image data written in the image memory. Painting processing unit for storing the data, an image display apparatus characterized by comprising.

According to a second aspect of the present invention, in the image display device according to the first aspect, the filled-line drawing unit draws a drawing point which is a starting point of a plurality of vectors forming the boundary line and a drawing within the vector. The image display device is characterized in that the coordinates of points are calculated, and the image data includes attribute data for identifying drawing points at both ends in a scanning line and other drawing points.

[0032]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of an image display device according to the present invention. In the following drawings, FIGS.
The same parts as 6 are given the same numbers and their explanations are omitted as appropriate. In FIG. 1, 16 is a filled line drawing unit,
Reference numeral 17 is a filling processing unit.

The filled-line drawing unit 16 calculates the coordinates of the drawing point that is the starting point of a plurality of vectors that form the boundary line of the image to be displayed and the coordinates of the drawing point within the vector, and the calculated coordinates are the display area. If it is within the range, the attribute data is written as image data in the image memory 12 corresponding to the coordinates,
If the calculated x-coordinate of the drawing point is off the left side of the display area, the attribute data is written in the image memory 12 corresponding to the left end of the display area having the same y-coordinate. The attribute data is data for identifying the drawing points at both ends in the scanning line and other drawing points.

FIG. 2A is a diagram showing a state in which a part of the image shown in FIG. 5A is displaced from the display area to the left side of the display area, and FIG. 2B is shown in FIG. 2A. FIG. 6 is a diagram for explaining a filled display of the image shown in FIG.

In FIG. 2B, the drawing points 6, 7, 7
a, 8, 8a, 8b, 8c, 8d and 8e are off the left side of the display area, the drawing point 6+ is the point to which the drawing point 6 has been moved, the drawing point 7+ is the point to which the drawing point 7 has been moved, and the drawing Point 7+
+ Is the point to which the drawing point 7a has been moved, drawing point 8+ is the drawing point 8
Is moved, the drawing points 8 ++ are drawn points 8a and 8b, and the drawing points 8 ++ are drawn points 8c, 8d and 8e.
Is the point that was moved. These are moved to the image memory at the left end of the display area having the same y coordinate.

The drawing order of the drawing points is 1 → 1a →
1b → 2 → 2a → 3 → 4 → 4a → 4b → 5 → 5a → 6 +
→ 7 + → 7 ++ → 8 + → 8 ++ → 8 ++++.

FIG. 3 is a flow chart for explaining the operation of the fill line drawing unit of the image display device according to the present invention.
ST11 to ST13 are added to the flowchart shown in FIG. Then, the drawing points 6, 7, 7a, 8, 8a, 8b, 8c, 8 which are off the left side of the display area
Since the drawing points other than d and 8e are the same as the description of the conventional example performed using FIG. 6, the description thereof will be omitted.

In FIG. 3, the coordinates of the drawing point 6, which is the start point of the sixth vector, are calculated in ST1, the x coordinate is determined to be outside the display area in ST3, and it is determined in ST11 whether it is on the left side of the display area. to decide.

Since the drawing point 6 is off the left side of the display area, the process proceeds to the next step ST12, and it is determined whether or not the value is the new y coordinate value of the sixth vector. Since the drawing point 6 is the start point of the sixth vector and has a new y coordinate value, ST13
In, the position of the image memory is moved to the image memory (0, y) at the drawing point 6+ at the left end of the display area, and the attribute "sin
gle ”is written.

Similarly, the drawing point 7 becomes the drawing point 7+, the drawing point 7a becomes the drawing point 7 ++, the drawing point 8 becomes the drawing point 8+,
Drawing point 8a is drawing point 8 ++, drawing point 8c is drawing point 8 ++
The attribute is moved to +, and the attribute "Single" is written in the image memory (0, y) at the left end of each display area.

Since the drawing points 8b, 8d, and 8e are not judged to be the new value of y in ST12, the image data is not written. The attributes finally stored in the drawing points are the drawing points 1, 1a, 2, 3, 4,
5,6 +, 7 +, 7 +++, 8 +, 8 ++, 8 +++
Becomes "Single" and the drawing points 1b, 2a, 4a,
4b and 5a become "Double". That is, the drawing points at both ends in the scanning line are given the attribute of "Single", the other drawing points are given the attribute of "Double", and the drawing points at the both ends in the scanning line and the other drawing points are given. The mutually distinguishable attribute data is stored in the corresponding image memory.

The operation of the painting processing section 17 is the same as in the conventional case described with reference to the flowchart of FIG. That is, according to the flowchart shown in FIG.
"On" is written as display data in the display memory corresponding to the image memory in which the attributes of "Single" and "Double" are stored, and "On" is displayed in the display memory corresponding to the image memory inside the boundary line when the image data is "Blank". Write "

That is, a boundary line is formed and its attribute is "Sin
Drawing points 1, 1 that are gle "or" Double "
a, 1b, 2, 2a, 3, 4, 4a, 4b, 5, 5a,
Display data "on" is written in the display memory corresponding to 6+, 7+, 7 ++++, 8+, 8 ++, 8 ++, and all the display memories inside the boundary line, and the display data "off" in all the display memory outside the boundary line. "Is written.

Then, the display memory 14 is scanned by a field programmable gate array (not shown) to read the display data, and based on the contents of the read display data, the drawing points forming the boundary line and the pixels within the boundary line are formed. Is turned on (lit) and the other pixels are turned off (dark), and the image is filled and displayed.

In this case, since the drawing point protruding to the left from the display area is moved to the left end of the same y in the display area, the starting point (left end) of the filling can be reliably detected when scanning the display memory. , The fill is executed normally. Therefore, there are no restrictions on the image that can be drawn.

[0046]

As described above, according to the present invention, the drawing point protruding leftward from the display area is moved to the left end of the same y in the display area. Even if is outside the display area, it is possible to display it in a filled manner, and it is possible to remove the restriction on the image to be drawn.

[Brief description of drawings]

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

FIG. 2 is a diagram for explaining the operation of a filled-line drawing unit.

FIG. 3 is a flowchart for explaining the operation of a filled line drawing unit.

FIG. 4 is a configuration diagram of a conventional image display device that performs a filling process.

FIG. 5 is a diagram for explaining an operation of a filled-line drawing unit of the conventional image display device.

FIG. 6 is a flowchart illustrating an operation of a filled-line drawing unit of the conventional image display device.

FIG. 7 is a flowchart illustrating an operation of a filling processing unit of the image display device.

[Explanation of symbols]

1,1a, 1b Drawing point 2,2a Drawing point 3 drawing points 4,4a, 4b Drawing points 5,5a Drawing point 6,6+ drawing points 7,7 +, 7 +++ drawing points 8, 8+, 8 ++, 8 +++ drawing points 12 image memory 14 Display memory 15 Display 16 Fill line drawing part 17 Fill processing section

Claims (2)

[Claims] 1. A boundary of an image to be displayed on the display unit by scanning and reading the contents of a display memory which stores display data for identifying ON / OFF of a plurality of pixels forming the display unit and which corresponds to a display area. In a raster scanning type image display device for filling and displaying the inside of a line, an image memory for storing image data of the image, and coordinates of a drawing point forming the boundary line are calculated, and the coordinates are within the display area. In the case, the image data is written in the image memory corresponding to the coordinate, and when the calculated x-coordinate of the drawing point deviates to the left side of the display area, the image data is written in the image memory corresponding to the left end of the display area of the same y-coordinate. A fill line drawing unit for writing, and a fill processing unit for storing display data in the display memory based on the image data written in the image memory,
An image display device comprising: 2. The image display device according to claim 1, wherein the filled-line drawing unit calculates coordinates of a drawing point that is a starting point of a plurality of vectors that form the boundary line and a drawing point within the vector, The image display device is characterized in that the image data includes attribute data for identifying drawing points at both ends in a scanning line and other drawing points.