Image forming apparatus

• US 7,474,445 B2
• Filed: 03/12/2004
• Issued: 01/06/2009
• Est. Priority Date: 03/12/2004
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation), Toshiba Tec Corporation (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation), Toshiba Tec Corporation (Toshiba Corporation)
• Inventors: Suzuki, Minoru, Kotsuji, Takuya
• Primary Examiner(s): Coles; Edward L.
• Assistant Examiner(s): Worku; Negussie
• Application Number:
  US10/798,406
• Publication Number:
  US 20050200908A1
• Time in Patent Office: 1,761 Days
• Field of Search: 358/474, 358/486, 358/500, 358/1.15, 382/284, 382/232, 348/312, 348/311
• US Class Current: 358/474
• CPC Class Codes: H04N 1/00933 Timing control or synchronising H04N1/00928, H04N1/00931, H04N1/00954 and H04N1/0096 take precedence
• CPC Class Codes: H04N 1/00938 Software related arrangements, e.g. loading applications program loading in general G06F9/445
• CPC Class Codes: H04N 1/0096 Simultaneous or quasi-simultaneous functioning of a plurality of operations H04N1/32545 takes precedence; multiprogramming arrangements of computers G06F9/46
• CPC Class Codes: H04N 1/32561 using a programmed control device, e.g. a microprocessor
• CPC Class Codes: H04N 2201/0094 Multifunctional device, i.e. a device capable of all of reading, reproducing, copying, facsimile transception, file transception

Abstract

An image forming apparatus includes an interface which receives a job of requesting an accelerator function, from the outside, a processing path decision section which determines whether a first image processing path to perform image processing in a copy operation overlaps a second image processing path to perform image processing in the execution of the accelerator function in the job received via the interface, and an image processing section which performs image processing in a copy operation and image processing in the execution of the accelerator function at the same time, when the processing path decision section determines that the first image processing path does not overlap the second image processing path.

Claims

1. An image forming apparatus comprising:

an interface which receives a job of requesting an accelerator function, from the outside;

a processing path decision section which determines whether a first image processing path to perform image processing in a copy operation overlaps a second image processing path to perform image processing in the execution of the accelerator function, which has a lower priority than the copy operation, in the job received via the interface;

a storage section which stores a management table to manage waiting jobs unable to execute the accelerator function;

a search section which searches the management table for a job where the first image processing path does not overlap the second image processing path to perform image processing in the execution of the accelerator function in the waiting jobs; and

an image processing section which performs image processing in a copy operation and image processing in the execution of the accelerator function at the same time, when the processing path decision section determines that the first image processing path does not overlap the second image processing path, in the case where a request is made for the execution of the accelerator function in the job received via the interface in a copy operation,

wherein when the processing path decision section determines that the first image processing path overlaps the second image processing path, the image processing section registers the job received via the interface in the management table as being one of the waiting jobs unable to execute the accelerator function, and executes a job searched for by the search section.

2. The image forming apparatus according to claim 1, wherein the management of the management table includes a parameter used in image processing requested by the accelerator function requested by the waiting jobs.

3. The image forming apparatus according to claim 2, further comprising:

a selector section which selects a job when a parameter managed in the management table for the job searched for by the search section coincides with a parameter already set in image processing performed in the image processing path of the job, wherein

the image processing section, when the job searched for is present, gives priority to the job selected by the selector section, in processing.

4. The image forming apparatus according to claim 1, wherein the image processing section includes a color image data processing section which processes color image data and a monochrome image data processing section for processing monochrome image data, and

each of the first image processing path and the second image processing path is a path which passes through either the color image data processing section or the monochrome image data processing section.

5. The image forming apparatus according to claim 4, further comprising:

a system load decision section which determines the magnitude of a system load;

an operating clock decision section which determines operating clocks for at least one of the color image data processing section and the monochrome image data processing section, on the basis of the load determined at the load decision section; and

a clock setting section which sets operating clocks in the color image data processing section and the monochrome image data processing section, in accordance with the determination of the operating clock decision section.

6. The image forming apparatus according to claim 1, wherein the image processing section includes a plurality of image processing blocks each of which subjects image data to different processing, wherein

each of the first image processing path and the second image processing path is a path which passes through said plurality of image processing blocks in a different manner.

7. The image forming apparatus according to claim 6, further comprising:

a system load decision section which determines the magnitude of a system load;

an operating clock decision section which determines an operating clock for at least each of said plurality of image processing blocks, on the basis of the load determined at the load decision section; and

a clock setting section which sets an operating clock for each of said plurality of image processing, in accordance with the determination of the operating clock decision section.

8. The image forming apparatus according to claim 1, further comprising:

a system load decision section which determines the magnitude of a system load;

an operating clock decision section which determines an operating clock for each processing section included in the image processing section on the basis of the load determined at the load decision section; and

a clock setting section which sets a clock operation for each of the processing sections according to the determination of the operating clock decision section.

9. The image forming apparatus according to claim 8, wherein the clock setting section which sets the clock operation for each of the processing sections according to the determination of the operating clock decision section as being either a first clock speed of an external clock signal, a second clock speed corresponding to one-half the first clock speed, or a third clock speed corresponding to one-quarter of the first clock speed.