Image processing apparatus including horizontal and vertical scaling for a computer display
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 11, 2000
Grant Date -
N/A
app pub date -
Dec 8, 1994
filing date -
Dec 8, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A scaling apparatus is disclosed for horizontally and vertically scaling scan line information stored in a video memory prior to providing the scan line information to a computer display. Horizontal scaling apparatus is provided in which a first clock signal is provided for graphics portions of scan lines and a second clock signal is provided for video portions of scan lines. The second clock signal is enabled in a manner such that the second clock signal exhibits a predetermined phase relationship with respect to the first clock signal from scan line to scan line. The frequency of the second clock signal is selected to determine the scaling of the video portion of the scan line. Vertical scaling apparatus is provided in which scan line information corresponding to first and second scan lines is retrieved from a video memory. A digital differential analyzer, external to the central processing unit, then determines respective weights for the first and second scan lines dependent on the amount of vertical scaling desired. The weights for the first and second scan lines are then provided to a weighted adder which adds the first and second scan lines according to these weights.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully