EP0710925A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
System and method for scaling video
Assignee: International Business Machines Corp
•
Filing: 1995-10-20
•
Granted: —
•
Expires: 2015-10-20
Abstract
Abstract Scaling of video is performed using area weighted averaging of input pixels to calculate coefficients to multiply with luminescence and crominence of input pixels. Such coefficients are produced for both the vertical and horizontal scaling directions of the input video stream. When scaling down or scaling up, scaling is first performed in the vertical direction to produce partially scaled pixels, which are then utilized for scaling in the horizontal direction. When scaling up, a pre-interpolation or pre-replication process is utilized to double the inputted pixel grid which doubled pixel grid is then utilized to scale down to the desired pixel grid size, which is greater than the originally inputted pixel grid size.
Inventors
- 👤 William Lloyd Mcneil
- 👤 David Carl Frank
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 08:31
CPC Classifications
G; G06; G06T; G06T3/00; G06T3/40; G06T3/4007
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
241 words
A method for scaling a video image, comprising the steps of: generating coefficients in a vertical direction as a function of an area weighted
average of contributions of input pixels to output pixels in said vertical direction
and as a function of a scaling ratio of said input pixels to said output pixels in
said vertical direction; generating coefficients in a horizontal direction as a function of an area weighted
average of contributions of input pixels to output pixels in said horizontal
direction and as a function of a scaling ratio of said input pixels to said output
pixels in said horizontal direction; multiplying input pixels of said video image by said coefficients generated in
said vertical direction as a function of an area weighted average of contributions
of input pixels to output pixels in said vertical direction and as a function of said
scaling ratio of said input pixels to said output pixels in said vertical direction,
said multiplying of said input pixels of said video image by said coefficients
generated in said vertical direction resulting in vertically scaled pixels; multiplying said vertically scaled pixels by said coefficients generated in said
horizontal direction as a function of an area weighted average of contributions
of input pixels to output pixels in said horizontal direction and as a function of
said scaling ratio of said input pixels to said output pixels in said horizontal
direction resulting in vertically and horizontally scaled pixels.
Claim 2
Dependent Claim
28 words
The method of claim 1, wherein said coefficients generated in said vertical
direction are also a function of an interpolation of said input pixels in said
vertical direction.
Claim 3
Dependent Claim
28 words
The method of claim 1, wherein said coefficients generated in said vertical
direction are also a function of a duplication of said input pixels in said vertical
direction.
Claim 4
Dependent Claim
30 words
The method of claim 1 or 2, wherein said coefficients generated in said
horizontal direction are also a function of an interpolation of said input pixels in
said horizontal direction.
Claim 5
Dependent Claim
30 words
The method of claim 1 or 3, wherein said coefficients generated in said
horizontal direction are also a function of a duplication of said input pixels in
said horizontal direction.
Claim 6
Dependent Claim
29 words
The method of claim 1, wherein said step of generating coefficients in a vertical
direction further comprises the step of logically doubling said input pixels in said
vertical direction.
Claim 7
Dependent Claim
31 words
The method of claim 1 or 5, wherein said step of generating coefficients in a
horizontal direction further comprises the step of logically doubling said input
pixels in said horizontal direction.
Claim 8
Dependent Claim
50 words
The method of claim 1, wherein said step of generating coefficients in a
horizontal direction iterates for each pixel on a line of said video image, resetting
at horizontal retrace, said step for generating coefficients in a vertical direction
iterating for each line of a field, resetting at vertical retrace.
Claim 9
Independent Claim
23 words
A system for scaling a video image comprising means for carrying out the steps
of the method according to claims 1 to 8.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.