Image processing method and apparatus

• US 5,363,219 A
• Filed: 04/01/1992
• Issued: 11/08/1994
• Est. Priority Date: 04/04/1991
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Yoshida, Tadashi
• Primary Examiner(s): Ro, Bentsu
• Application Number:
  US07/861,763
• Time in Patent Office: 951 Days
• Field of Search: 358/400, 358/442, 358/443, 358/448, 358/462, 358/467, 358/468, 358/500, 358/501, 358/539, 358/401, 358/426, 358/261.1, 358/261.2, 358/261.3, 358/432, 358/433, 382/41, 382/44, 382/54, 382/56
• US Class Current: 358/539
• CPC Class Codes: G09G 2310/0208 using active addressing
• CPC Class Codes: G09G 3/2014 by modulation of the duration of a single pulse during which the logic level remains constant
• CPC Class Codes: G09G 3/2018 by time modulation using two or more time intervals
• CPC Class Codes: H04N 1/41 Bandwidth or redundancy reduction by scanning H04N1/17 ; methods or arrangements for coding, decoding, compressing or decompressing digital video signals H04N19/00
• CPC Class Codes: H04N 1/642 Adapting to different types of images, e.g. characters, graphs, black and white image portions

Abstract

In a color facsimile apparatus, a color image file, or the like, an encoding system suitable for a color image to be transmitted is promptly selected and the image data is transmitted. The apparatus has: the color image input unit 20 to read a color image; a plurality of color image encode units 22 and 24 including the white/black image encoding; the storage units 23 and 25 to store the encode data; the means 28 and 29 for decoding the encode data; the means 32 for displaying the decoded image; and the protocol means 27 with an apparatus on the partner side.

Claims

1. An image encoding apparatus comprising:

input means for inputting image data representing an original;

first encoding means for encoding the image data as binary image data representing the original;

second encoding means for encoding the image data as multilevel image data representing the original;

selecting means for selecting one of the image data encoded by said first or second encoding means; and

transmitting means for transmitting the image data selected by said selecting means,

wherein said first encoding means encodes the image data as binary image data line by line and said second encoding means encodes the image data as multilevel image data block by block, each block being a two-dimensional block having a plurality of pixels, and

wherein said first encoding means and said second encoding means encode the same image data of one original in parallel.

2. An apparatus according to claim 1, further having decoding means for decoding the image data encoded by said first and second encoding means.

3. An apparatus according to claim 2, further having display means for displaying the image data decoded by said decoding means.

4. An apparatus according to claim 1, wherein said selecting means includes setting means for manually performing the selection.

5. An apparatus according to claim 1, wherein said selecting means performs the selection in accordance with an apparatus on the transmission side.

6. An apparatus according to claim 5, wherein said selecting means performs the selection in accordance with a protocol with said apparatus.

7. An apparatus according to claim 1, wherein said first encoding means performs an entropy encoding.

8. An apparatus according to claim 1, wherein said second encoding means performs the encoding using an orthogonal transformation.

9. An image encoding method comprising:

input step of inputting image data representing an original;

first encoding step of encoding the image data as binary image data representing the original;

second encoding step of encoding the image data as multilevel image data representing the original;

selecting step of selecting one of the image data encoded by said first or second encoding step; and

transmitting step of transmitting the image data selected by said selecting step.

wherein said first encoding step encodes the image data as binary image data line by line while said second encoding step encodes the image data as multilevel image data block by block, each block being a two-dimensional block having a plurality of pixels, and

wherein said first encoding step and said second encoding step encode the same image data of one original in parallel.

10. An image encoding apparatus comprising:

input means for inputting image data representing an original;

first encoding means for encoding the image data as binary image data representing the original;

second encoding means for encoding the image data as multilevel image data representing the original; and

memory means for storing the image data encoded by said first encoding means and said second encoding means in parallel,

wherein said first encoding means encodes the image data as binary image data line by line while said second encoding means encodes the image data as multilevel image data block by block, each block being a two-dimensional block having a plurality of pixels, and

wherein said first encoding means and said second encoding means encode the same image data of one original in parallel.

11. An apparatus according to claim 10, further having decoding means for decoding the image data encoded by said first and second encoding means.

12. An apparatus according to claim 11, further having display means for displaying the image data decoded by said decoding means.

13. An apparatus according to claim 10, wherein said first encoding means performs an entropy encoding.

14. An apparatus according to claim 10, wherein said second encoding means performs the encoding using an orthogonal transformation.

15. An image encoding method comprising:

input step of inputting image data representing an original;

first encoding step of encoding the image data as binary image data representing the original;

second encoding step of encoding the image data as multilevel image data representing the original; and

storing step of storing the image data encoded by said first encoding step and said second encoding step in parallel,

wherein said first encoding step encodes the image data as binary image data line by line while said second encoding step encodes the image data as multilevel image data block by block, each block being a two-dimensional block having a plurality of pixels, and

wherein said first encoding step and said second encoding step encode the same image data of one original in parallel.

16. An image encoding apparatus comprising:

input means inputting color image data representing an original;

first encoding means for encoding the image data as color image data representing an original;

second encoding means for encoding the image data as monochromatic image data representing the original;

memory means for storing the image data encoded by said first encoding means and said second encoding means in parallel;

selecting means for selecting one of the image data encoded by said first or second encoding means and stored in said memory means; and

transmitting means for transmitting the image data selected by said selecting means,

wherein said second encoding means encodes the color image data as monochromatic image data line by line while said first encoding means encodes the color image data as color image data block by block, each block being a two-dimensional block having a plurality of pixels, and

wherein said first encoding means and said second encoding means encode the same color image data of one original in parallel.

17. An apparatus according to claim 16, further having decoding means for decoding the image data encoded by said first and second encoding means.

18. An apparatus according to claim 17, further having display means for displaying the image data decoded by said decoding means.

19. An apparatus according to claim 16, wherein said selecting means includes setting means for manually performing the selection.

20. An apparatus according to claim 16, wherein said selecting means performs the selection in accordance with an apparatus on the transmission side.

21. An apparatus according to claim 20, wherein said selecting means performs the selection in accordance with a protocol with said apparatus.

22. An apparatus according to claim 16, wherein said first encoding means performs an entropy encoding.

23. An apparatus according to claim 16, wherein said second encoding means performs the encoding using an orthogonal transformation.

24.

input step of inputting image data representing an original;

first encoding step of encoding the image data as color image data representing the original;

second encoding step of encoding the image data as monochromatic image data representing the original; and

storing step of storing the image data encoded by said first encoding step and said second encoding step in parallel,

wherein said second encoding step encodes the color image data as monochromatic image data line by line while said first encoding step encodes the color image data as color image data block by block, each block being a two-dimensional block having a plurality of pixels, and

wherein said first encoding step and said second encoding step encode the same color image data of one original in parallel.