Image processing apparatus and method
First Claim
1. An image processing apparatus comprising:
- detection means for detecting correlation between color-component signals of an input image signal; and
smoothing means for performing smoothing processing on the image signal inversely proportional to the correlation detected by said detection means.
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Abstract
In an image processing apparatus and method for effectively removing noise from an input image signal, a mean-value calculation unit calculates the mean value of pixels within a predetermined region in the vicinity of a target pixel, for each color component. A binary-coding unit performs binary-coding processing of the values of pixels within the predetermined region, for each color component, based on the mean value for each color component. A correlation-coefficient calculation unit calculates a correlation coefficient from characteristics between binary image data of respective color components. A smoothing unit performs smoothing processing by adding the value of the target pixel and the mean value using the calculated correlation coefficient, for example as a weight.
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Citations
23 Claims
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1. An image processing apparatus comprising:
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detection means for detecting correlation between color-component signals of an input image signal; and smoothing means for performing smoothing processing on the image signal inversely proportional to the correlation detected by said detection means. - View Dependent Claims (2, 3, 4, 5)
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6. An image processing method comprising the steps of:
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detecting correlation between color-component signals of an input image signal; and performing smoothing processing on the image signal inversely proportional to the correlation detected in said detection step.
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7. An image processing apparatus comprising:
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detection means for detecting correlation between color-component signals of an input image signal; and conversion means for converting spatial-frequency characteristics of the image signal in accordance with the detected correlation, wherein said conversion means performs sharpening processing when the detected correlation approaches a maximum value and performs smoothing processing when the detected correlation approaches a minimum value. - View Dependent Claims (8, 9, 10)
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11. An image processing method comprising the steps of:
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detecting correlation between color-component signals of an input image signal; and converting spatial-frequency characteristics of the image signal in accordance with the detected correlations wherein said converting step includes performing sharpening processing when the detected correlation approaches a maximum value and performing smoothing processing when the detected correlation approaches a minimum value.
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12. An image processing apparatus comprising:
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detection means for detecting a correlation value between color-component signals of an input image signal; and smoothing means for performing stronger smoothing when the correlation value detected by said detection means is a low value. - View Dependent Claims (13, 14, 15)
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16. A method for an image processing apparatus, comprising the steps of:
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detecting a correlation value between color-component signals of an image signal; and performing smoothing on the image signal, wherein stronger smoothing is performed when the correlation value is a low value.
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17. An image processing apparatus comprising:
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detection means for detecting correlation between color-component signals of an input image signal; and conversion means for converting spatial frequency characteristics of the image signal in accordance with the detected correlation, wherein said conversion means converts the spatial frequency characteristics by sharpening processing or smoothing processing in accordance with whether the detected correlation is high or low. - View Dependent Claims (18, 19, 20)
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21. A method for an image processing apparatus, comprising the steps of:
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detecting correlation between color-component signals of an image signal; and converting spatial frequency characteristics of the image signal in accordance with the detected correlation, wherein the spatial frequency characteristics are converted in said converting step by sharpening processing or smoothing processing in accordance with whether the detected correlation is high or low.
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22. An image processing apparatus comprising:
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detection means for detecting correlation value between color-component signals of an input image signal; and smoothing means for controlling the strength of smoothing in accordance with correlation value detected by said detection means.
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23. A method for an image processing apparatus, comprising the steps of;
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detecting correlation value between color-component signals of an image signal; and controlling the strength of smoothing in accordance with correlation value detected by said detection means.
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Specification