Image processing apparatus

• US 4,734,786 A
• Filed: 10/15/1984
• Issued: 03/29/1988
• Est. Priority Date: 10/17/1983
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Ishizawa, Yasuhisa, Minakawa, Takashi
• Primary Examiner(s): Coles, Sr., Edward L.
• Application Number:
  US06/660,924
• Time in Patent Office: 1,261 Days
• Field of Search: 358/283, 358/287, 382/47
• US Class Current: 358/451
• CPC Class Codes: G06T 3/40 Scaling of whole images or parts thereof, e.g. expanding or contracting
• CPC Class Codes: H04N 1/3935 with modification of image resolution, i.e. determining the values of picture elements at new relative positions
• CPC Class Codes: H04N 1/40075 Descreening, i.e. converting a halftone signal into a corresponding continuous-tone signal; Rescreening, i.e. combined descreening and halftoning

Abstract

An image processing apparatus comprises image data input means and processing means for processing the image data inputted from the input means. The processing means enlarges or reduces the image data by a unit of a predetermined area.

Claims

1. An image processing apparatus comprising:

image data input means; and

processing means for processing image data from said input means;

said processing means changing the size of predetermined areas of the image data for each of said areas in accordance with an input magnification factor, said predetermined areas having a plurality of image data in conjunction with a half-tone processing operation.

2. An image processing apparatus according to claim 1 further comprising memory means for storing said image data, wherein said processing means magnifies the image data while transferring the image data from a first location to a second location in said memory means.

3. An image processing apparatus according to claim 2 wherein said processing means includes register means for storing addresses corresponding to said first and second locations.

4. An image processing apparatus according to claim 2 wherein said processing means includes register means for storing a value associated with a size of the magnified image.

5. An image processing apparatus according to claim 1 wherein said processing means enlarges the image data for each predetermined area having a plurality of image data associated with a half-tone process.

6. An image processing apparatus according to claim 1 wherein said processing means reduces the image data for each predetermined area having a plurality of image data associated with half-tone process.

7. An image processing apparatus according to claim 1 wherein said input image data is half-tone processed bit data.

8. An image processing apparatus comprising:

image data input means; and

processing means for processing image data from said input means, wherein the size of predetermined areas of said image data are changed and wherein said input image data is half-tone processed by a dither matrix, and said processing means changes the size of predetermined areas of said image data for each area associated with said dither matrix.

9. An image processing apparatus comprising:

image data input means; and

processing means for processing the image data from said input means while transferring said image data from a first location to a second location;

said processing means changes the size of said image data in association with a dither matrix when said image data is half-tone processed by said dither matrix.

10. An image processing apparatus according to claim 9 wherein said processing means changes the size of areas of said image data for each dither matrix.

11. An image processing apparatus according to claim 10 further comprising memory means for storing said image data, wherein said processing means magnifies the areas of image data while transferring the image data from said first location to said second location in said memory means.

12. An image processing apparatus according to claim 9 wherein said processing means includes register means for storing addresses corresponding to said first and second locations.

13. An image processing apparatus according to claim 9 wherein said processing means enlarges said areas of image data in association with said dither matrix.

14. An image processing apparatus according to claim 9 wherein said processing means reduces said areas of image data in association with said dither matrix.

15. An image processing apparatus according to claim 9 wherein said image data is bit data half-tone processed by said dither matrix.