Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
1998-11-04
2001-05-22
Luu, Matthew (Department: 2672)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S182000
Reexamination Certificate
active
06236387
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a page display system, a method of displaying pages, and a recording medium containing a program for displaying pages, and particularly relates to a page display system, a method therefor, and a recording medium containing a program for indicating pages, utilizing after-images.
This application is based on Patent Application No. Hei.9-302896 filed in Japan, the content of which is incorporated herein by reference.
2. Background Art
Four million years have passed since the birth of human beings. The invention of paper brought a great progress in accumulation of information. The invention of the typography by Gutenberg in the fifteenth century has further produced remarkable progress in the transmission and accumulation of information. Until recent years, paper has been widely used as a recording medium due to its fine visibility. Paper is thin, supple, and elastic. These characteristics of paper enable reading of printed papers by handling papers and turning pages such that parcels of necessary information are extracted by identifying letters as a pattern from many pages in a bundle of papers within a short time.
Recently, as computerization advances with the progress of electronics, called the second industrial revolution, information is often displayed by display devices such as cathode-ray tubes and LCDs (Liquid Crystal Display). However, since such devices are self-luminous and inferior in resolution, letters or lines of letters as patterns displayed in such display devices are inferior in high speed and intuitive visibility than those on paper. This constitutes a basic reason for obstruction of the spread of electronic apparatuses for displaying lengthy documents such as, for example, electronic books, and obstruction of the arrival of the paperless age.
Japanese Patent Application, First Publication No. Sho 62-18595 discloses a display device which is capable of improving visibility by utilizing after-images. This device displays a sum of both multiplication products, one of which is a multiplication product of an output of a first frame buffer by an output from a display control circuit and another is a multiplication product of an output of a second frame buffer by a compliment of an output of a display control circuit.
The first problem of the hereinabove described conventional device is in that it is not possible for the device to control the timing of the displayed after-image at any time on request of a user. The problem is due to the fact that the time to display the after-image is not alterable, since an output from the display control circuit is constantly being generated.
The second problem is that the conventional device cannot perform processing of structured text. This is because the device is not provided with means to convert the structured text into picture images.
The third problem is that the device cannnot send or scroll pages in the opposite direction (that is, return to the previous images). This is because the device is not provided with a means to send pages in the opposite direction.
It is therefore the object of the present invention to provide a system which is capable of improving the visibility of letters or lines of letters as patterns by increasing an information content displayed at a time point by composing the after-image of the previous page on the presently displayed page as well as by increasing the total time for displaying one page.
SUMMARY OF THE INVENTION
A page display system according to the first embodiment of the present invention is provided for inspecting a plurality of pages of a structured text, which can not be displayed on one page, by scrolling pages either in forward or backward directions, in order to improve the intuitive visibility of letters and lines of letters as image patterns. This system is provided with a means to determine a waiting time for replacing a page by a user's direction, and a means for increasing an information content of the display and for automatically increasing a total time of displaying a page by composing the previous image as an after-image on the present page being displayed on a display, while controlling a brightness of the after-image by comparing the display start time of the previous page with that of the present image.
A page display system according to the second embodiment of the present invention is provided with,
(a) a formatter for interpreting a structured text, arranging the structured text into a page unit, and for preparing the form of the page;
(b) a rasterizer for expanding letters into fonts to transform them into a pattern, and for generating a page image as a unit page with an attached data image, when the attached data is directed by the structured text so as to be incorporated into the page;
(c) an image buffer for storing unit page images corresponding to two pages generated by said rasterizer;
(d) an image composer for synthesizing said unit page images corresponding to two pages stored in said image buffer;
(e) a display device for displaying said composed image formed by said image composer;
(f) a page scroll controller having a slider to be controlled by a user for scrolling pages in the backward direction when a cursor is moved to a left side region from the center of the slider, for scrolling pages in the forward direction when the cursor is moved to the right side region of the slider, and the page scrolling speed is proportional to an angular displacement of the cursor from the center;
(g) a timer for generating a time;
(h) a composition controller for controlling a degree of composition based on both input from said page scroll controller and a time from said timer.
A page display system according to the third embodiment of the present invention is the same system as the system according to the second embodiment and the image composer outputs a brightness value of each pixel of the composed image by calculating a sum of both multiplication products, one is a multiplication product of a brightness value of each pixel of the previous page image stored in said image buffer by f (t), and another is a multiplication product of a brightness values of each pixel of the present image by 1-f(t).
A first method of displaying pages for inspecting a plurality of pages of structured text, which can not be displayed in one page, by scrolling pages in either forward or backward directions, comprising the steps of:
determining a waiting time for replacing pages by a user's direction;
increasing an amount of displayed information and automatically increasing a time of displaying a page by superposing the previous image as an after-image on the present displayed page, after controlling a brightness of the after-image by comparison with that of the present image, which results in improving the intuitive visibility of letters and lines of letters as pattern images.
The second method of displaying pages comprises:
(a) a first step to make a formatter interpret a structured text, arrange the structured text into unit pages, and prepare a form of page;
(b) a second step to make a rasterizer expand letters into fonts to transform them into a pattern, and generate a page image as a unit page with an attached data, when the attached data is directed by the structured text so as to be incorporated in the page;
(c) a third step to make an image buffer store unit page images corresponding to two pages generated by said rasterizer;
(d) a fourth step to make an image composer compose said unit page images corresponding to two pages stored in said image buffer;
(e) a fifth step to make a display device display said composed image formed by said image composer;
(f) a sixth step to make a page scroll controller having a slider to be controlled by a user send pages in the backward direction when a cursor is moved to a left side region from the center of the slider, send pages in the forward direction when the cursor is moved to the right side region of the slider, and the page scroll speed is proportiona
Cunningham G. F.
Luu Matthew
NEC Corporation
Sughrue Mion Zinn Macpeak & Seas, PLLC
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