CA2109681A1 - Method and Apparatus for the Coding and Display of Overlapping Windows with Transparency - Google Patents

Method and Apparatus for the Coding and Display of Overlapping Windows with Transparency

Info

Publication number
CA2109681A1
CA2109681A1 CA2109681A CA2109681A CA2109681A1 CA 2109681 A1 CA2109681 A1 CA 2109681A1 CA 2109681 A CA2109681 A CA 2109681A CA 2109681 A CA2109681 A CA 2109681A CA 2109681 A1 CA2109681 A1 CA 2109681A1
Authority
CA
Canada
Prior art keywords
pixel
transparent
coded
displayed
windows
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2109681A
Other languages
French (fr)
Other versions
CA2109681C (en
Inventor
Donald Edgar Blahut
Edward Stanley Szurkowski
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Corp
Original Assignee
American Telephone and Telegraph Co Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by American Telephone and Telegraph Co Inc filed Critical American Telephone and Telegraph Co Inc
Publication of CA2109681A1 publication Critical patent/CA2109681A1/en
Application granted granted Critical
Publication of CA2109681C publication Critical patent/CA2109681C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/222—Studio circuitry; Studio devices; Studio equipment
    • H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/14—Display of multiple viewports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/222—Studio circuitry; Studio devices; Studio equipment
    • H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
    • H04N5/272—Means for inserting a foreground image in a background image, i.e. inlay, outlay
    • H04N5/275—Generation of keying signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/445—Receiver circuitry for the reception of television signals according to analogue transmission standards for displaying additional information
    • H04N5/45—Picture in picture, e.g. displaying simultaneously another television channel in a region of the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/10—Mixing of images, i.e. displayed pixel being the result of an operation, e.g. adding, on the corresponding input pixels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/12—Overlay of images, i.e. displayed pixel being the result of switching between the corresponding input pixels

Abstract

A method and apparatus for the coding and efficient display of overlapping windows with transparency is disclosed. Each pixel within a window which is not to be displayed may be coded as a "transparent" pixel. The disclosed method identifies those pixels which have been coded as transparent and displaysnon-transparent pixels contained in windows of lower, display priority in place of the transparent pixels contained in windows of higher display priority. A pixel coded as transparent may have associated with it an integer representative of the number of successive pixels in the window which are also transparent. A pixel may be coded as transparent by assigning to it a preselected data value which is distinct from values otherwise used to indicate, e.g., the color and/or intensity for each displayed pixel.
The disclosed method and apparatus may include one or more windows which contain full motion video (i.e., television) images, each of which may also contain transparent pixels. A pixel also may be coded as a "translucent" pixel, whereby a combination of the translucent pixel and a non-translucent pixel contained in a window of lower display priority is displayed. The disclosed method may be used to efficiently recognize various conditions in the displayed image, including the collision of objects and the pointing of a displayed cursor to identified "hot spots."
CA002109681A 1993-03-10 1993-11-22 Method and apparatus for the coding and display of overlapping windows with transparency Expired - Lifetime CA2109681C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US2920593A 1993-03-10 1993-03-10
US029,205 1993-03-10

Publications (2)

Publication Number Publication Date
CA2109681A1 true CA2109681A1 (en) 1994-09-11
CA2109681C CA2109681C (en) 1998-08-25

Family

ID=21847787

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002109681A Expired - Lifetime CA2109681C (en) 1993-03-10 1993-11-22 Method and apparatus for the coding and display of overlapping windows with transparency

Country Status (6)

Country Link
US (1) US5463728A (en)
EP (1) EP0615223B1 (en)
JP (1) JP3320889B2 (en)
KR (1) KR940023189A (en)
CA (1) CA2109681C (en)
DE (1) DE69403515T2 (en)

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Also Published As

Publication number Publication date
JP3320889B2 (en) 2002-09-03
US5463728A (en) 1995-10-31
DE69403515T2 (en) 1997-12-18
CA2109681C (en) 1998-08-25
KR940023189A (en) 1994-10-22
JPH06348246A (en) 1994-12-22
EP0615223A1 (en) 1994-09-14
DE69403515D1 (en) 1997-07-10
EP0615223B1 (en) 1997-06-04

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Legal Events

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MKEX Expiry

Effective date: 20131122

MKEX Expiry

Effective date: 20131122