Image expansion apparatus
First Claim
1. An image expansion apparatus for expanding an image two-dimensionally, comprising:
- an image memory for temporarily storing image data inclusive of an area to be expanded;
reading means for successively reading image data, which has been written in said image memory, out of said image memory at a speed different from that at which the image data was written in said image memory;
delay means for delaying, by a predetermined period of time, the image data read out of said image memory; and
selecting means for alternately selecting, at a predetermined time interval, image data which has and has not passed through said delay means.
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Accused Products
Abstract
An image expansion apparatus includes a FIFO-type image memory, writing and reading circuits for the image memory, and a plurality of cascade-connected delay circuits for sequentially delaying image data read out of the FIFO image memory. Image expansion in the main scanning direction is achieved by applying a delay to make the speed at which image data is read out of the FIFO image memory slower than that at which the image data is written in the FIFO image memory. Image expansion in the feed scanning direction is achieved by successively selecting and delivering outputs from delay circuits the number of which is equal to the magnification of the image.
32 Citations
21 Claims
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1. An image expansion apparatus for expanding an image two-dimensionally, comprising:
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an image memory for temporarily storing image data inclusive of an area to be expanded; reading means for successively reading image data, which has been written in said image memory, out of said image memory at a speed different from that at which the image data was written in said image memory; delay means for delaying, by a predetermined period of time, the image data read out of said image memory; and selecting means for alternately selecting, at a predetermined time interval, image data which has and has not passed through said delay means. - View Dependent Claims (2, 3, 4)
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5. An image expansion apparatus for expanding an image two-dimensionally, comprising:
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a FIFO-type image memory for storing, in first-in, first-out fashion, image data inclusive of an area to be expanded; a writing circuit for writing the image data in said FIFO-type image memory at a predetermined writing speed; a reading circuit for successively reading the image data, which has been written in said FIFO-type image memory, out of said FIFO-type image memory at a reading speed different from that which the image data was written in said FIFO-type image memory; a delay circuit for delaying, by a predetermined period of time, the image data read out of said FIFO-type image memory; and a selecting circuit for alternately selecting, at a predetermined time interval, image data which has and has not passed through said delay circuit. - View Dependent Claims (6, 7, 8, 9, 10)
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11. An image expansion apparatus for expanding an image, comprising:
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a FIFO-type image memory for storing, in first-in, first-out fashion, image data inclusive of an area to be expanded; a writing circuit for writing the image data in said FIFO-type image memory at a predetermined writing speed; a reading circuit for successively reading the image data, which has been written in said FIFO-type image memory, out of said FIFO-type image memory at a predetermined reading speed; a two-input selecting circuit for alternately switching between and outputting its two inputs in response to a predetermined control signal, said selecting circuit being connected to said FIFO-type image memory and having data read out of said FIFO-type image memory as one of its inputs; and a delay circuit connected to an output side of said selecting circuit for delaying, by a predetermined period of time, input data applied thereto, an output of said delay circuit being connected to the other one of the inputs of said selecting circuit. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. An image expanding apparatus for expanding an image, comprising:
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a two-input selecting circuit for alternately switching between and outputting its two inputs in response to a predetermined control signal, one of the inputs of said selecting circuit being image data which includes an area to be expanded; a delay circuit for delaying an output of said selecting circuit by a predetermined period of time, an output of said delay circuit being the other input of said selecting circuit; a FIFO-type image memory for storing, in first-in, first-out fashion, the output of said delay circuit; a writing circuit for writing the image data in said FIFO-type image memory at a predetermined writing speed; and a reading circuit for successively reading the image data, which has been written in said FIFO-type image memory, out of said FIFO-type image memory at a predetermined reading speed. - View Dependent Claims (19, 20, 21)
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Specification