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Image processing coefficient determination method, image processing coefficient calculation system, image processing system, image processing method, and storage medium
| Details |
Inventors: Kobayashi, Yuji; Uchihashi, Shingo; Takeo, Nobuyuki; Ogatsu, Hitoshi; Kita, Shinji;
Assignee: Fuji Xerox Co., Ltd. (Tokyo, JP)
Primary Examiner: Au; Amelia
Assistant Examiner: Miller; Martin E.
Attorney, Agent or Firm: Oliff & Berridge, PLC
An image processing coefficient determination method of an image processing system comprising the steps of: outputting test pattern image data having one or more image areas each containing a specific spatial frequency component by an image output device for preparing an output image, measuring a spatial frequency characteristic of the output image, and determining spatial frequency processing coefficients from a relationship between a spatial frequency characteristic of the test pattern image data and the measurement result of the spatial frequency characteristic of the output image. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG.
1 is a block diagram to show one embodiment of the invention.
In the figure, numeral 1 is a process operation section, numeral 2 is an output section, numeral 3 is a measurement section, numeral 4 is a coefficient calculation section, and numeral 5 is a test pattern holding section.
The process operation section 1 performs various types of processing for input image data and prepares output image data.
Here, it performs at least spatial frequency processing and conversion processing for input image data so as to provide spatial frequency responsive to a given image output device.
The spatial frequency processing performed at the time uses processing coefficients calculated by the coefficient calculation section 4.
When the processing coefficients are calculated, necessary processing other than the spatial frequency processing is applied to test pattern image data held in the test pattern holding section 5 for preparing output image data.
The output section 2 outputs the output image data prepared by the process operation section 1.
When the processing coefficients used in the spatial frequency processing are calculated, the measurement section 3 measures the spatial frequency characteristic of a test pattern image output from the output section 2 based on the test pattern image data held in the test pattern holding section 5.
The coefficient calculation section 4 finds a spatial frequency characteristic of the test pattern image data held in the test pattern holding section 5 and gets the spatial frequency characteristic of the test pattern image measured by the measurement section 3, then calculates processing coefficients used in the spatial frequency processing from the relationship between the spatial frequency characteristics.
The test pattern holding section 5 holds test pattern image data.
The test pattern image data can be made up of two or more patch images different in spatial frequency, for example.
A patch image with a DC component, namely, spatial frequency 0 can be included as one of the patch images
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