JPS6057891A - Bold-faced display system for line drawing display - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of displaying thick lines to prevent flickering when displaying line drawings, and a thick line display in line drawing display that is particularly effective when displaying using an interlaced method. It is related to the method.

Prior Art and Problems Displaying line drawings on a cathode ray tube (CRT), projector, etc. is necessary for electronic blackboards, handwriting communication devices, and the like.

FIG. 1 shows an example of the configuration of a system for displaying line drawings. The figure shows a case where handwriting is displayed, and the handwriting input device 1
Characters written on the input surface in .

A line drawing such as a figure is scanned to generate an image signal, and the controller 2
The signal is then input to a display device 3 consisting of a CET or the like. At this time, the control device 2 controls the handwriting input device 1 and the display 3,
The scanning on the handwriting input device 1 and the scanning i on the display 3 are performed synchronously, so that the characters and figures written on the input surface of the handwriting input device 1 are displayed on the display surface of the display 3. will be displayed. In the handwriting input device 1, instead of displaying characters and graphics written on the input surface, information on characters and graphics stored in the memory may be read out in response to scanning. For salt scanning in such line drawing display devices, an interlace method is generally used in which even and odd fields are scanned alternately.

FIG. 2 schematically shows a line drawing displayed on a conventional line drawing display device, and αtAt'
Square divisions such as +'... each represent one pixel, scanning lines with hatching represent odd fields, and scanning lines without hatching represent even fields. When displaying characters, figures, etc. on a conventional line drawing display device, the light emitting time of one point (a, h, 6, etc.) on the screen is shorter than the afterimage time of the eye, so it may be blinking. However, since the light emitting point is shifted by one scanning line,
The lines that make up the line drawing flicker and are not only difficult to see, but also cause the viewer to feel extremely fatigued when viewed for a long time. Such flickering is particularly noticeable when a line drawing is displayed as a still image.

On the other hand, conventional display devices are mainly made for moving images, and no consideration is given to still images. Therefore, in order to prevent flickering in the case of still images, it is necessary to first When creating the image, I had to take measures such as making the lines thicker to reduce the effect of flickering.

OBJECT OF THE INVENTION The present invention attempts to solve the problems of the prior art, and its purpose is to display thicker lines than the original images on a line image display device, thereby improving the performance of still images. Another object of the present invention is to provide a method that can reduce line flickering.

Structure of the Invention The display method of the present invention doubles the lines by overlapping the data of odd and even fields generated by scanning an original image by shifting -scanning lines, thereby making the lines thicker than the original image and displaying it statically. This is designed to reduce flickering even in the case of pictures.

Embodiment of the Invention FIG. 3 shows the structure of an embodiment of the bold line display method of the invention. In the figure, 11 is an image memory, 12 is an OR circuit, 13 is a gray line, and 14 is a disk memory.

The handwritten information from the handwriting input device 1 is temporarily stored in the disk memory 1.
4 and then written to the image memory 11.

Odd field and even field image signals are alternately read out from the image memory 11, passed through an OR circuit 12, and applied to a display device 3 using an interlaced scanning method for display.

On the other hand, the image signal read from the image memory 11 is delayed through a delay line 13 consisting of a shift register or the like so that it reaches the same position on the next adjacent scanning line on the screen. The output signal of the delay line 16 is added to the previous signal via the OR circuit 12 and displayed on the display device 6.

FIG. 4 schematically shows the display of line drawings using the display method shown in FIG. 6. In the figure, pixels α+'+'+... are images read out from the image memory 11 and displayed by signals input directly, and pixels α+"+"+... are read out from the image memory 11 and displayed by signals input directly. This is an image displayed by a signal input via the delay line 16. Thus, according to that method,
Since all the pixels are always displayed at different positions, it becomes impossible to see the pixels blinking. However, the pixels move up and down, but this is hardly noticeable to the human eye, so there is no particular problem.

The above explanation took the interlaced method as an example, but even in the non-interlaced method, the scanning position of 11 images is
This method can be applied to any method that shifts the scanning line.

As described in detail, according to the line thickening display method in line drawing display of the present invention, the input signal is delayed so that it is at the same position on the next adjacent scanning line on the screen, and the delayed input signal is Since the display is performed on the display device using the added signal, it is possible to reliably thicken the lines forming the line drawing and prevent flickering.
Moreover, the structure is simple and the increase in circuit scale is minimal.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of the configuration of a system for displaying line drawings, FIG. 2 is a diagram illustrating line drawings displayed on a conventional line drawing display device, and FIG. 5 is a display of thicker lines in the line drawing display of the present invention. FIG. 4, which is a diagram showing the configuration of an embodiment of the method, is a diagram illustrating a line drawing displayed by the display method of the present invention. DESCRIPTION OF SYMBOLS 1... Handwriting input device, 2... Control device, 6... Display device, 11... Image memory, 12... OR circuit, 1
3...Delay line, 14...Disk memory patent applicant Fujitsu Limited agent Patent attorney Kugobe Tamamushi (1 other person)

Claims (1)

[Claims] In a line drawing display device that displays a line drawing on a screen using an image signal ri corresponding to a scanning line, there is provided a delay means for delaying an input signal to the same position on the next adjacent scanning line on the screen, and an input signal and the delay. 1. A thick line display method for displaying line drawings, comprising an adding means for adding the output of the adding means, and displaying on a display device based on the output of the adding means.