Discriminating an image data characteristic and controlling storage of the data accordingly

• US 5,903,360 A
• Filed: 08/01/1996
• Issued: 05/11/1999
• Est. Priority Date: 07/31/1990
• Status: Expired due to Fees

• Current Assignee: AT&T Corporation (AT&T, Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Honma, Koichi, Ishikawa, Hisashi, Atobe, Hiroshi
• Primary Examiner(s): VU, KIM Y
• Application Number:
  US08/690,963
• Time in Patent Office: 1,013 Days
• Field of Search: 358/450, 358/451, 358/452, 358/453, 358/426, 358/540, 358/462, 382/284
• US Class Current: 358/450
• CPC Class Codes: H04N 19/98 Adaptive-dynamic-range coding [ADRC]

Abstract

An image processing apparatus and method in which plural gradation-information storage units are provided, and at least one of those units is selected to store a given body of gradation information based on command information, such as resolution information. The different units store gradation information in different forms, e.g., compressed and uncompressed.

Claims

1. An image processing apparatus comprising:

reception means for receiving data in a page description language;

development means for analyzing the received data, and converting the received data into first image data representing a first kind of object and second image data representing a second kind of object;

change means for changing the first image data into changed first image data based on an overlapping state of the first kind of object and the second kind of object;

first storage means for storing the changed first image data in a first data format;

second storage means, different from said first storage means, for storing the second image data in a second data format different from the first data format; and

synthesis means for reading and synthesizing together the changed first image data stored in said first storage means and the second image data stored in said second storage means.

2. An apparatus according to claim 1, wherein the first kind of object is a line image and the second kind of object is an image other than a line image.

3. An apparatus according to claim 1, wherein the first data format is such that the first image data is not compressed, and the second data format is such that the second image data is compressed.

4. An apparatus according to claim 3, wherein the second data format is such that the second image data is non-reversibly compressed.

5. An apparatus according to claim 1, wherein said change means changes the first image data corresponding to an area where the first kind of object and the second kind of object overlap each other.

6. An apparatus according to claim 5, wherein said change means changes the first image data corresponding to the area, from data representing the first kind of object to data representing a blank space.

7. An apparatus according to claim 1, further comprising output means for outputting image data synthesized by said synthesis means, to a page printer.

8. An image processing method comprising:

a reception step of receiving data in a page description language;

a development step of analyzing the received data, and converting the received data into first image data representing a first kind of object and second image data representing a second kind of object;

a change step of changing the first image data into changed first image data based on an overlapping state of the first kind of object and the second kind of object;

a first storage step of storing the changed first image data in a first data format in first storage means;

a second storage step of storing the second image data in a second data format different from the first data format in second storage means different from the first storage means; and

a synthesis step of reading and synthesizing together the changed first image data stored in said first storage step and the second image data stored in said second storage step.