US 8,300,150 B2Granted

Image processing apparatus and method

AssigneeRealtek Semiconductor Corp.

InventorsChien-Chen Chen, Chun-Hsing Hsieh

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Abstract

An image processing apparatus includes a pixel difference calculator, a summing unit, a determining unit, and an output unit. The pixel difference calculator receives a present image having first pixels and a previous image having second pixels, calculates pixel differences between corresponding first and second pixels, and outputs positive and negative pixel difference values. The summing unit obtains a first output value by adding up those of the positive pixel difference values and a second output value by adding up those of the negative pixel difference values. The determining unit determines a noise level of the present image from the first and second output values, and outputs a blended value. The output unit adds together weights of pixels at the same positions of the present and previous images according to the blended value to generate an output image. An image processing method is also disclosed.

Claims12

Dependent claims

An image processing apparatus comprising:

a pixel difference calculator receiving a present image having a plurality of first pixels and a previous image having a plurality of second pixels, said pixel difference calculator calculating pixel differences between the first pixels and the second pixels which positions corresponding to the first pixels, and outputting a plurality of pixel difference values, the pixel difference values including a plurality of positive pixel difference values and a plurality of negative pixel difference values;
a summing unit coupled to said pixel difference calculator, and for obtaining a first output value by adding up those of the positive pixel difference values and for obtaining a second output value by adding up those of the negative pixel difference values;
a determining unit coupled to said summing unit includes a total pixel difference calculator for calculating a total pixel difference, which indicates a noise level, according to the first and second output values, and outputting a blended value, wherein the blended value correlates to a level of noise interference;
and
an output unit coupled to said determining unit, and for adding up those of weights of pixels at the same positions of the present image and the previous image according to the blended value to generate an output image, wherein the blended value is inversely related to the total pixel difference.

2 more elements

An image processing method comprising:

receiving a present image having a plurality of first pixels and a previous image having a plurality of second pixels;
calculating pixel differences between the first pixels and the second pixels which positions are corresponding to the first pixels, and outputting a plurality of pixel difference values, the pixel difference values including a plurality of positive pixel difference values and a plurality of negative pixel difference values;
obtaining a first output value by adding up those of the positive pixel difference values and a second output value by adding up those of the negative pixel difference values;
calculating a total pixel difference, which indicates a noise level, according to the first and second output values, and outputting a blended value, wherein the blended value correlates to a level of noise interference;
and
adding up those of weights of pixels at the same positions of the present image and the previous image according to the blended value to generate an output image, wherein the blended value is inversely related to the total pixel difference.

3 more elements

Dependencies are inferred from the claim text.