Image processing device
First Claim
1. An image processing device comprising:
- input means for inputting a plurality of color component signals representing a color image;
identification means for identifying a type of the color image on the basis of the plurality of color component signals from said input means;
first compression means for compressing the color component signals from said input means by using an information-preserving-type of encoding method;
second compression means for compressing the color component signals from said input means by using an information-non-preserving-type of encoding method;
selection means for selecting one of said first and second compression means in accordance with the type of the color image identified by said identification means; and
storage means for storing compressed color component signals from said first or second compression means together with identification data representing the type of the color image identified by said identification means.
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Accused Products
Abstract
The type of color image is identified on the basis of a distribution of color information for each color. A plurality of different types of data compression algorithms prepared beforehand are changed according to the results of the identification. Preferably, the difference between the maximum value and the minimum value of each picture element of respective color separation data of a color image is determined, and further, a histogram of frequency of color information obtained for each color is determined. On the basis of the histogram, the type of the color image is identified by the fact that whether or not the histogram contains a peak greater than a predetermined value or whether or not the deviation of the histogram is greater than a predetermined value.
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Citations
21 Claims
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1. An image processing device comprising:
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input means for inputting a plurality of color component signals representing a color image; identification means for identifying a type of the color image on the basis of the plurality of color component signals from said input means; first compression means for compressing the color component signals from said input means by using an information-preserving-type of encoding method; second compression means for compressing the color component signals from said input means by using an information-non-preserving-type of encoding method; selection means for selecting one of said first and second compression means in accordance with the type of the color image identified by said identification means; and storage means for storing compressed color component signals from said first or second compression means together with identification data representing the type of the color image identified by said identification means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 19)
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8. An image processing device comprising:
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input means for inputting a plurality of color component signals representing a color image; identification means for identifying a type of the color image on the basis of the plurality of color component signals from said input means; first compression means for compressing the color component signals from said input means by using an information-preserving-type of encoding method; second compression means for compressing the color component signals from said input means by using an information-non-preserving-type of encoding method; selection means for selecting one of said first and second compression means in accordance with the type of the color image identified by said identification means; storage means for storing compressed color component signals from said first or second compression means together with identification data representing the type of the color image identified by said identification means; and decompression means for decompressing the compressed color component signals stored in said storage means in accordance with the identification data. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An image processing method comprising the steps of:
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inputting a plurality of color component signals representing a color image; identifying a type of the color image on the basis of the plurality of color component signals; selecting one of an information-preserving-type of encoding method and an information-non-preserving-type of encoding method in accordance with the type of the color image identified in said identifying step; compressing the color component signals by using the selected encoding method; and storing the compressed color component signals in a memory together with identification data representing the type of the color image identified in said identifying step. - View Dependent Claims (16, 17)
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18. An image processing method comprising the steps of:
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inputting a plurality of color component signals representing a color image; identifying a type of the color image on the basis of the plurality of color component signals; selecting one of an information-preserving-type of encoding method and an information-non-preserving type of encoding method in accordance with the type of the color image identified by said identifying step; compressing the color component signals by using the selected encoding method; storing the compressed color component signals in a memory together with identification data representing the type of the color image identified by said identifying step; and decompressing the compressed color component signals stored in said memory in accordance with the identification data. - View Dependent Claims (20, 21)
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Specification