JPS60121887A - Writing system of still picture - Google Patents

Abstract

PURPOSE:To improve the picture quality without depending on the display system of a display by writing data in a monitor display picture memory while the adjoining lines of still picture information are averaged sequentially. CONSTITUTION:Digital still picture data by one line from an input terminal 1 are stored once in a buffer memory 2, and are also inputted to an averaging device 3. The data which are inputted by the real time, and the data which are one line before stored in the buffer memory 2 are averaged sequentially, and the data are written in a monitor display picture memory 4 by the control of a buffer controller 5. The data stored in the memory 4 are read by matching with the input condition of the display by the control of the controller 5, and outputted to the display through a D/A converter 6. Thus, the picture quality can be improved without depending on the display system of the display.

Description

TECHNICAL FIELD The present invention relates to a method for improving image quality when displaying a still image on an interlaced scanning display device.

Conventional technology When converting a still image into a video signal and displaying it on an interlaced scanning display device equivalent to a standard television (e.g. television of the NTSC system, PAL system, etc., Video Gronector), the male frequency When displaying an image in which the correlation between adjacent lines is low because a (field frequency) is low, there is a problem of deterioration in image quality called 7-bit filtering.

Conventionally, as a method to improve this flicker without increasing the vertical frequency, when reading out a still image written to the image memory for display on a monitor for display, adjacent lines are added (averaged) to calculate the difference between adjacent lines. A method was proposed to provide a correlation between Add 3 to the readout circuit side for
In order to add the TliEITt valley, the display method (NTSC
, PAL, etc.), it was also necessary to adjust the adder circuit on the readout circuit side.

OBJECT OF THE INVENTION Accordingly, an object of the present invention is to provide a system that can improve image quality without depending on the display system (NTSC, PAL, etc.) of the optical display device O11.

Structure of the Invention The present invention focuses on the fact that the acquisition timing of still image information, that is, the timing of writing still image information into an image memory for display on a monitor, is slower than the readout timing for display. Flicker is improved by easily averaging adjacent lines one after another to create a correlation.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of one embodiment of the present invention. One line of digital still image data obtained by an analog/digital converter or the like is input from an input terminal 1 .

This one line worth of digital still image data is temporarily stored in the buffer memory 2, and at the same time is manually input to the averager 3. The averager 3 sequentially averages the data input in real time and the data of the previous line stored in the buffer memory 2, and writes the data into the image memory 4 for monitor display in response to a control signal from the controller 50. The data stored in the image memory 4 for monitor display is read out according to the input conditions of the display device by a control signal from the controller 50, converted into a video signal by the digital/analog converter 6, and displayed from the output terminal 7. Output to the device.

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, since the still image for one screen stored in the image memory for monitor display has data of adjacent lines averaged and correlated,
It is possible to overcome the flickering of display images in the interlaced scanning method, and to display still images of sufficient image quality on a standard television display device without the need for a dedicated high-frequency display device. Further, since the adder circuit is provided on the display writing circuit side, the adder circuit A is not required, and the image quality can be improved without depending on the display method of the display device.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one embodiment of the present invention. 1... Input terminal 2... Buffer memory 3... Averager 4... Image memory for monitor display 5... Controller 6... Digital/analog converter 7... Output terminal.

Claims (1)

[Claims] The present invention is characterized in that adjacent lines of still image information are written into an image memory for monitor display while being averaged. Still image writing method.