JPS5985535A - Picture display device - Google Patents

Abstract

PURPOSE:To display an easy-to-see pattern by obtaining the ratio of area occupied by the character and pattern parts in (m) units of segments from the output of a picture input device having the image resolution fractionized a picture element on a monitor screen into 1/n, then delivering the level information having the gradation proportional to said ratio of area. CONSTITUTION:The output of a digitizer 10 of a picture display device is written to an X-Y memory 11, and the image resolution fractionized to 1/n having the vertical length equal to a space L between horizontal scanning lines and the horizontal length approximately equal to L is set for the size of a picture element which is displayed on a monitor TV screen. The picture elements of 1/n image resolution which is supplied from the memory 11 is applied to a converter 12 corresponding to an output. The converter 12 obtains the ratio of area occupied by the character and pattern parts in (m) units of segments corresponding to a picture element from the picture input information and converted into the gradation level information porportional to said ratio for each element S. The level information is stored in a picture memory 13 and converted into the analog information by D/A converter 14. Thus an easy-to-see pattern having a smooth contour line is displayed on a monitor TV.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an image display device that processes an image signal inputted by an image input device manually or the like and displays the processed image signal on an ORT.

Conventional technology and its problems Drawing figures etc. on the board of an image input device such as a digitizer, storing the output X-Y position information in one memory,
The readout output of this memory is converted into a video signal (JR
2. Description of the Related Art An image display device that displays an image on a T is conventionally known. In this device, X-Y position information is stored in each cell in the memory as "'1" or 0" information (1 bit), so the horizontal fixed line of the image shown on the CRT is On the other hand, there is a drawback that the diagonal contour line is 6 jagged.

OBJECTS OF THE INVENTION The object of the present invention is to eliminate the above-mentioned drawbacks and to obtain an image having smooth contour lines without any jagged edges.

Embodiment FIG. 1 is a plan view of a well-known digitizer showing an example of an image input device used in an embodiment of the present invention. This sliding body (1a%l) that can slide in the UX direction of the digitizer
b) and a sliding body (2) held by these sliding bodies and capable of sliding in the Y direction. Then, use the cursor (3) attached to the sliding body (2) to move any figure onto the board (
4) Wire (5) drawn above and connected to the sliding body (1a)
) and the wire (6) connected to the sliding body (2) drive the rotary encoders (7) (8), and the image input signal indicating the X-Y coordinates of the point on the figure is transferred to the encoder (force (8) In addition to the digitizer shown in Figure 1, there are also Rand tablets that use capacitance electrodes in an X-Y matrix, and photoelectric conversion tablets that use a hologram code plate for coordinate conversion. , a Grafpen tablet using a spark pen and X, Y microphones, etc. can be used.

FIG. 2 is a block diagram showing an embodiment of an image input device according to the present invention. Digitizer (10) shown in Figure 1
The output is first written into the XY memory α. The size of the minimum unit (picture element) of a figure displayed on the monitor 17 screen is defined as the distance between vertical and horizontal scanning lines, as shown in Figure 6.
Assuming that the horizontal length is equal to y, the number of picture elements on the screen is 496 (effective scanning line a) x 657 (495
XT). Assume that the digitizer (10) Ic has, for example, 4×4-16 times the resolution in the vertical and horizontal directions for one picture element (S) on the TV screen, as shown in FIG. Therefore, (X-Y memory cell) is (493x4
)X (657x4) memory cells, each cell (1
The image input signal (X-Y position information) is “1” in
Written as 0.

The output of the X-Y memory cell is given to the converter α,
Here, one piece of information for one pixel is converted for each 4x4 memory cell. This converter α is composed of a microcomputer and counts the number N of 61" in one picture search area that can be read in each 4 segments, and calculates the ratio N/16 to the brightness of one picture element on the monitor screen. Convert to level information.For example, 4th
Since the Tl-E ratio of the 4x4 area Sij as shown in the figure is 13/16, the information representing the brightness level of the picture element corresponding to the area Sij is 15/l 6 +. Is this 4-pit binary information 1? "1101"' (= 13
) tc phase i sle.

The image is written to a 493x657x4 bit video memory with a capacity of 4 bits with 1 pixel l attached to the output of the converter (14).
The input figure is converted into an analog signal and then sent to a monitor TV), where the input figure is displayed.

According to this display method, the brightness level of the picture element located on the contour line of the figure on the monitor screen is changed as before.
The luminance changes smoothly from one figure part to the ground color part without creating a step-like outline due to a sudden change from (black) to 1″' (white), and the integral effect of the eye Together with this, a display figure with smooth outlines can be obtained.

Note that in the above explanation, the resolution of the digitizer α0) is 1
Although it is assumed that the number of picture elements is 16 times (4x4), in reality, it is possible to obtain an accuracy of 36 (6x6) to 64 (8x8) times, and therefore, the converter (one picture element per For example, converting to 64 level (8 bit) information,
A graphical display is performed on the screen using 8-bit level information.

Furthermore, the converter α may be provided with a function of changing the line thickness of the line drawing drawn by the digitizer 001 or a function of filling in the loop drawn by the line drawing. 1 picture element above /
The area ratio occupied by characters and figures in m segments is determined from the output of an image input device having a resolution divided into m segments, and the information is converted into gradation level information proportional to this ratio and displayed. .

Therefore, step-like jaggedness does not occur in the outline of the displayed figure, and it is possible to obtain an easy-to-read display figure with a smooth outline.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a conventionally known digitizer showing an example of an image input device used in the embodiment of the present invention, and FIG. 2 is a plan view of an image display device according to the present invention. FIG. 6 is a block diagram showing one embodiment; FIG. 6 is a plan view showing the relationship between the picture elements on the monitor screen and the graphic input segment of the digitizer;
The figure is a partial plan view of a friend figure drawn with a digitizer. In addition, in the symbols used in the drawing, (1a) (1b)...Sliding body (2)...Sliding body (3)...
・・・・・・・・・Cursor (4)・・・・・・・・・・・・
...Board (5X6) ...Wire (7
X8)... Encoder α0)...
・・・・・・Digitizer (11)・・・・・・・・・
...X-Y memory Q21...
・Converter 0th floor・・・・・・・・・Video memory 0
4)・・・・・・・・・D/A converter (S)...
・・・・・・・・・It is a picture element. Ihiki Wang ￥ Hisa Tsune Bao Yoshi Rikitsutsu 1 a Fig. 2

Claims (1)

[Claims] An image input device capable of forming image input information having a resolution of 17 m subdivided into 1 picture element, which is the smallest unit of characters and figures displayed on a monitor screen, and corresponding to the above 1 picture element. a converter that calculates the area ratio occupied by characters and figures in the m segments from the image input information and converts it into gradation level information proportional to this ratio for each tani-e, An image display device characterized in that characters and figures are displayed based on the output f of a device.