Image processing apparatus and method based on feature of a color image

• US 7,424,152 B2
• Filed: 09/16/2005
• Issued: 09/09/2008
• Est. Priority Date: 04/06/1995
• Status: Expired due to Fees

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Matsukubo, Yushi, Ohta, Ken-ichi, Yamakawa, Junichi, Funada, Masahiro
• Primary Examiner(s): Chen; Wenpeng
• Application Number:
  US11/227,148
• Publication Number:
  US 20060008146A1
• Time in Patent Office: 1,089 Days
• Field of Search: 382/173, 358/3.21, 358/3.03
• US Class Current: 382/173
• CPC Class Codes: G06K 15/02 using printers
• CPC Class Codes: G06K 15/1822 Analysing the received data before processing
• CPC Class Codes: G06K 15/1852 involving combining data of different types
• CPC Class Codes: G06K 2215/0065 Page or partial page composition
• CPC Class Codes: H04N 1/40062 Discrimination between different image types, e.g. two-tone, continuous tone
• CPC Class Codes: H04N 1/4056 the pattern varying in one dimension only, e.g. dash length, pulse width modulation [PWM]

Abstract

In order to produce a high-quality output of an image which is a mixture of images having different characteristics, there is provided an image processing apparatus having an image memory storing an entered color image and a feature detector, arranged for detecting a feature signal from the entered color image and storing the feature signal in the image memory. The feature signal represents a feature of the entered color image. An outputter is arranged for reading an image signal of the entered color image and the feature signal thereof out of the image memory, and outputting the image and feature signals as a recording signal. Processors are arranged for respectively processing one of a number of color components, which represent color image information, in accordance with the recording signal. The detection and storage in the image memory of feature signals and the readout of the image signal and associated feature signal from the image memory are performed in parallel.

Claims

1. An image processing apparatus comprising:

an image memory storing an entered color image;

a feature detector, arranged for reading the entered color image out of said image memory, for detecting a feature signal from the color image, and for storing the feature signal in an address of said image memory, where the address follows the entered color image, the feature signal representing a feature of the entered color image;

an outputter, arranged for reading a plurality of color component signals of the entered color image and the feature signal thereof out of said image memory, and outputting the plurality of color component signals and feature signals as a recording signal; and

a plurality of processors, arranged for respectively processing one of a plurality of color components, which represent color image information, in accordance with the recording signal,

wherein the reading of the plurality of color component signals and feature signal thereof from said image memory by said outputter is started while the detection of the feature signal and the storage of the feature signal in said image memory are performed by said feature detector; and

wherein each of the color component signals is read, by said outputter, at a reading interval in accordance with the arrangement of the plurality of processors.

2. The apparatus according to claim 1, further comprising a converter arranged for converting the plurality of color component signals to a recording signal in which importance is placed upon resolution or a recording signal in which importance is placed upon tonality, based upon the feature signal.

3. The apparatus according to claim 1, wherein the feature signal indicates whether each pixel forms a character or a line drawing.

4. The apparatus according to claim 2, wherein, on the basis of the feature signal, said converter converts an image signal of a pixel, which forms a character or line drawing, to a recording signal in which importance is placed upon resolution, and converts an image signal of a pixel, which forms an area other than a character or line drawing, to a recording signal in which importance is placed upon tonality.

5. An image processing method comprising the steps of:

reading an entered color image stored in an image memory;

detecting a feature signal representing a feature of the color image and storing the feature signal in an address of the image memory, where the address follows the entered color image;

reading a plurality of color component signals of the entered color image and the feature signal thereof out of the image memory and outputting the plurality of color component signals and feature signal as a recording signal; and

processing a plurality of color components representing color image information in accordance with the recording signal by using a plurality of processors, each of which processes one of the plurality of color components,

wherein the reading of the plurality of color component signals and feature signal thereof from the image memory in said reading step is started while the detection of the feature signal and the storage of the feature signal in the image memory are performed in said detecting step, and

wherein each of the color component signals is read, in said reading step, at a reading interval in accordance with the arrangement of the plurality of processors.