Imae processing apparatus having mosaic processing feature that decreases image resolution without changing image size or the number of pixels

• US 5,617,224 A
• Filed: 02/03/1994
• Issued: 04/01/1997
• Est. Priority Date: 05/08/1989
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Ichikawa, Hiroyuki, Kitamura, Toshiyuki, Ikeda, Yoshinori, Suzuki, Yasumichi, Katoh, Koichi, Kurita, Mitsuru
• Primary Examiner(s): Johns, Andrew
• Application Number:
  US08/191,146
• Time in Patent Office: 1,153 Days
• Field of Search: 358/443, 358/448, 358/451, 358/453, 358/458, 358/468, 358/528, 358/530, 358/537, 358/538, 382/47, 382/298, 382/299
• US Class Current: 358/530
• CPC Class Codes: G06T 3/4023 based on decimating pixels or lines of pixels; based on inserting pixels or lines of pixels
• CPC Class Codes: G06T 3/4038 Image mosaicing, e.g. composing plane images from plane sub-images
• CPC Class Codes: H04N 1/3871 the composed originals being of different kinds, e.g. low- and high-resolution originals
• CPC Class Codes: H04N 1/3873 defined only by a limited number of coordinate points or parameters, e.g. corners, centre; for trimming
• CPC Class Codes: H04N 1/40062 Discrimination between different image types, e.g. two-tone, continuous tone
• CPC Class Codes: H04N 1/40068 Modification of image resolution, i.e. determining the values of picture elements at new relative positions H04N1/3935 takes precedence
• CPC Class Codes: H04N 1/40093 Modification of content of picture, e.g. retouching geometric modifications H04N1/387
• CPC Class Codes: H04N 1/46 Colour picture communication systems
• CPC Class Codes: H04N 1/60 Colour correction or control H04N1/54 takes precedence
• CPC Class Codes: H04N 1/6072 adapting to different types of images, e.g. characters, graphs, black and white image portions

Abstract

A copying apparatus includes an input device for inputting image data, a processing circuit for performing mosaic processing of the input image data, and a reproduction circuit for reproducing an image based on the processed image data. The processing circuit divides the input image data into a plurality of block areas and paints each block area with a uniform color according to the image data in the area so that the resolution of the image data is lower than the resolution of the original image.

Claims

1. A printing apparatus comprising:

a) input means for inputting image data having a predetermined resolution;

b) processing means for performing mosaic processing and normal processing of the image data input of said input means;

c) reproduction means for reproducing an image based on the image data subjected to either the mosaic processing or the normal processing by said processing means;

d) mode setting means for selecting a mosaic processing mode or a normal processing mode; and

e) instruction means for instructing a start of printing, wherein said input means, said processing means and said reproduction means are operated in accordance with a one-time instruction of the start of printing by said instruction means,

wherein said processing means, in the mosaic processing mode, divides the input image data into a plurality of rectangular block areas and paints each rectangular block area with a uniform color based on the image data in the rectangular block area so that the resolution of the image represented by the mosaic-processed image data is lower than the predetermined resolution without changing either a size of the image or a number of pixels for the image, and, in the normal processing mode, outputs processed image data so that the resolution of the image represented by the normal-processed image data is the same as the predetermined resolution.

2. An apparatus according to claim 1, wherein said input means comprises a CCD line sensor.

3. An apparatus according to claim 1, wherein said processing means comprises a common circuit for executing the mosaic processing for a plurality of color component signals.

4. An apparatus according to claim 1, wherein said processing means comprises a plurality of storage means for storing input image data in units of lines, and control means for controlling write and read operations of said plurality of storage means.

5. An apparatus according to claim 1, wherein said reproduction means comprises image forming means for sequentially forming color mosaic images processed by said processing means in units of colors.

6. An apparatus according to claim 5, wherein said image forming means comprises a photosensitive body.

7. An apparatus according to claim 5, wherein said image forming means comprises a laser beam printer.

8. An apparatus according to claim 5, wherein said image forming means comprises a bubble jet printer.

9. An apparatus according to claim 1, wherein the input image data comprises pixel data and each rectangular block area comprises a plurality of pixels, and wherein said processing means paints all pixels in a rectangular block area the same color.

10. A copying apparatus comprising:

a) conversion means for scanning an original image placed on an original supporting plate, by relatively moving said conversion means with respect to the original image and for converting the scanned original image into image data having a predetermined resolution;

b) processing means for performing mosaic processing and normal processing of the image data;

c) mode setting means for selecting a mosaic processing mode or a normal processing mode; and

d) reproduction means for reproducing an image based on the image data subjected to the mosaic processing or the normal processing by said processing means, wherein said processing means starts performing the processing before the original image conversion corresponding to one frame is completed by said conversion means,

wherein said processing means, in the mosaic processing mode, divides the input image data into a plurality of rectangular block areas and paints each rectangular block area with a uniform color based on the image data in the rectangular block area so that the resolution of the image represented by the mosaic-processed image data is lower than the predetermined resolution without changing either a size of the image or a number of pixels for the image, and, in the normal processing mode, outputs processed image data so that the resolution of the image represented by the normal-processed image data is the same as the predetermined resolution.

11. An apparatus according to claim 10, wherein said conversion means comprises a CCD line sensor.

12. An apparatus according to claim 10, wherein said processing means comprises a common circuit for executing the mosaic processing for the image data.

13. An apparatus according to claim 10, wherein said processing means includes a plurality of storage means for storing input image data in units of lines, and control means for controlling write and read operations of said plurality of storage means.

14. An apparatus according to claim 10, wherein said reproduction means comprises image forming means for sequentially forming color mosaic images processed by said processing means in units of colors.

15. An apparatus according to claim 14, wherein said image forming means comprises a photosensitive body.

16. An apparatus according to claim 14, wherein said image forming means comprises a laser beam printer.

17. An apparatus according to claim 14, wherein said image forming means comprises a bubble jet printer.

18. An apparatus according to claim 10, wherein the input image data comprises pixel data and each rectangular block area comprises a plurality of pixels, and wherein said processing means paints all pixels in a rectangular block area the same color.