Image compressing device, image forming apparatus, image compressing method, and recording medium
AssigneeRicoh Company, Ltd.
InventorsTakuji Kamada, Satoshi Ouchi
Life of this patent
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Abstract
An image compressing device includes: a histogram creating unit configured to create a histogram regarding an input image; an original type recognizing unit configured to recognize an original type of the input image using the histogram; and an image compressing unit configured to perform a compression process for creating a high-compressed image file from the input image and to control a compression mode of the compression process depending on at least the original type recognized by the original type recognizing unit.
Claims20
An image compressing device comprising:
- at least one memory including computer readable instructions;
- and
- at least one processor configured to execute the computer readable instructions to,
- create a histogram regarding an input image,
- recognize an original type of the input image using the histogram, and
- perform an image compression process for creating a high-compressed image file from the input image by,
- performing gradation correction on the input image based on the original type,
- separating the input image, after the gradation correction, into a line drawing area and another area,
- performing a first compression process on the line drawing area, and
- performing a second compression process on the another area, the second compression process being different from the first compression process.
An image compressing method performed by an image compressing device, the image compressing method comprising:
- creating a histogram regarding an input image;
- recognizing an original type of the input image using the histogram;
- and
- performing an image compression process for creating a high-compressed image file from the input image by,
- performing gradation correction on the input image based on the original type recognized at the recognizing of the original type,
- separating the input image after the gradation correction into a line drawing area and another area,
- performing a first compression process on the line drawing area, and
- performing a second compression process on the another area, the second compression process being different from the first compression process.
A non-transitory computer-readable recording medium including programmed instructions that when executed by a processor cause the processor to:
- create a histogram regarding an input image,
- recognize an original type of the input image using the histogram, and
- perform an image compression process for creating a high-compressed image file from the input image by,
- performing gradation correction on the input image based on the original type,
- separating the input image, after the gradation correction, into a line drawing area and another area,
- performing a first compression process on the line drawing area, and
- performing a second compression process on the another area, the second compression process being different from the first compression process.
Dependencies are inferred from the claim text.