IMAGE PROCESSING APPARATUS AND IMAGING APPARATUS AND METHOD
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Abstract
An image processing apparatus (5) that corrects an input image signal (Xin) pixel by pixel to generate a corrected image signal (Xout), having a filtering means (2) that determines a luminance distribution of a pixel to be corrected and pixels neighboring the pixel to be corrected, a correction gain calculation means (3) that determines the correction gain of the pixel to be corrected, and an operation means (4) that uses the correction gain determined by the correction gain calculation means to perform an operation on the input image signal pixel by pixel. With this simple configuration, the dynamic range of the input image can be appropriately improved.
44 Citations
28 Claims
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1-23. -23. (canceled)
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24. An image processing apparatus for correcting an input image signal pixel by pixel to generate a corrected image signal, comprising:
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a filter unit for determining and outputting a luminance distribution of a pixel to be corrected and pixels neighboring the pixel to be corrected; a correction gain calculation unit for determining a correction gain of the pixel to be corrected from the output of the filter unit; and an operation unit for performing an operation on the input image signal pixel by pixel using the correction gain determined by the correction gain calculation unit;
whereinthe output of the filter unit is an average luminance of the pixel to be corrected and pixels neighboring the pixel to be corrected; the operation performed by the operation unit is multiplication; and the correction gain calculation unit calculates the correction gain so that the average luminance multiplied by the correction gain is a monotonically increasing function, having a characteristic such that when the average luminance is large the correction gain becomes small, and a characteristic such that when the average luminance is small the correction gain becomes large. - View Dependent Claims (25, 26, 27)
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28. An image processing method for correcting an input image signal pixel by pixel to generate a corrected image signal, an image processing method comprising:
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a step of determining a luminance distribution of a pixel to be corrected and pixels neighboring the pixel to be corrected; a step of determining a correction gain of the pixel to be corrected from said luminance distribution; and a step of performing an operation on the input image signal pixel by pixel, using the determined correction gain;
whereinthe luminance distribution in the step of determining a luminance distribution is an average luminance of the pixel to be corrected and pixels neighboring the pixel to be corrected; the operation performed in the step of using the determined correction gain to perform an operation is multiplication; and the correction gain in the step of determining a correction gain is calculated so that the average luminance multiplied by the correction gain is a monotonically increasing function, having a characteristic such that when the average luminance is large the correction gain becomes small, and a characteristic such that when the average luminance is small the correction gain becomes large.
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Specification