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EP0216501A2
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Digital image rotation
Assignee: Xerox Corp
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Filing: 1986-08-20
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Granted: —
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Expires: 2006-08-20
Abstract
Abstract A method of rotating a digital image during real time involves conveying bit map data into and out of a band buffer (12) and shift register (18) to an image output terminal to provide either portrait or landscape printing during print time. In particular, for portrait printing; an 8 to 1 multiplexer (16) selects one of 8 bits to send for each raster scan. For landscape printing, the 8 bits are sent to a shift register (18) and then all 8 bits are sent as part of the raster scan.
Inventors
- 👤 Anthony James Baroody, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 15:45
CPC Classifications
G; G06; G06T; G06T3/00; G06T3/60
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
148 words
A method of rotating a digital image in a system having a memory for storing a digital image, a band buffer connected to the memory for storing a portion of the digital image representing a given number of scan lines, a raster output scanning device, and a shift register connected between the band buffer and the raster output scanning device, the method including the steps of storing the digital image in the memory having a first scan direction; dividing the digital image into a plurality of sections; sequentially moving the sections from the memory; partially changing the scan direction of each section upon removal from the memory to the band buffer; conveying the sections from the band buffer to the shift register; and completely changing the scan direction of each section to a second scan direction upon shifting from the shift register to the raster ouput scanning device.
Claim 2
Independent Claim
148 words
A method of rotating a digital image in a system having a memory for storing a digital image, a band buffer connected to the memory for storing a portion of the digital image representing a given number of scan lines, a raster output scanning device, and a shift register connected between the band buffer and the raster output scanning device, the method including the steps of storing the digital image in the memory having a first scan direction; dividing the digital image into a plurality of sections; sequentially moving the sections from the memory; partially changing the scan direction of each section upon removal from the memory to the band buffer; conveying the sections from the band buffer to the shift register; and completely changing the scan direction of each section to a second scan direction upon shifting from the shift register to the raster ouput scanning device.
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein the second scanning direction is 90° removed from the first scan direction.
Claim 4
Dependent Claim
134 words
A digital image rotation system comprising a memory for storing a digital image in a first scan direction, the digital image being divided into a plurality of sections, a band buffer connected to the memory for storing a portion of the digital image representing a given number of scan lines and for sequentially receiving the sections from the memory, the scan direction of each section being partially changed upon removal to the band buffer, a raster output scanning device, and a shift register connected between the band buffer and the raster output scanning device, means for conveying the sections from the band buffer to the shift register, and means for completely changing the direction of each section to a second scan direction upon shifting from the shift register to the raster output scanning device.
Claim 5
Dependent Claim
134 words
A digital image rotation system comprising a memory for storing a digital image in a first scan direction, the digital image being divided into a plurality of sections, a band buffer connected to the memory for storing a portion of the digital image representing a given number of scan lines and for sequentially receiving the sections from the memory, the scan direction of each section being partially changed upon removal to the band buffer, a raster output scanning device, and a shift register connected between the band buffer and the raster output scanning device, means for conveying the sections from the band buffer to the shift register, and means for completely changing the direction of each section to a second scan direction upon shifting from the shift register to the raster output scanning device.
Claim 6
Dependent Claim
18 words
The system of claim 3 wherein the second scanning direction is 90° removed from the first scan direction.
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