Image de-noising method and apparatus thereof

An image de-noising apparatus, comprising:

• an image capture device, configured for capturing an image and transforming the image into an image signal with a specific image format;
• an image processor, coupled to the image capture device, configured for receiving the image signal, and transforming the image signal into a current frame;
• and
• a de-noising device, coupled to the image processor, and configured to execute the following steps:
• receiving the current frame, and categorizing the pixel in the current frame into a first low-frequency pixel and a first high-frequency pixel, wherein the first low-frequency pixel has a first weight and the first high-frequency pixel has a second weight;
• categorizing a previous pixel corresponding to the position of the pixel in a previous frame into a second low-frequency pixel and a second high-frequency pixel, wherein the second low-frequency pixel has a third weight and the second high-frequency pixel has a fourth weight;
• adjusting the first weight and the third weight and calculating the weighted sum of the first low-frequency pixel and the second low-frequency pixel, to generate low-frequency pixel data, wherein the sum of the first weight and the third weight is one;
• adjusting the second weight and the fourth weight and calculating the weighted sum of the first high-frequency pixel and the second high-frequency pixel, to generate high-frequency pixel data, wherein the sum of the second weight and the fourth weight is one;
• and
• calculating the sum of the low-frequency pixel data and the high-frequency pixel data, to output the de-noised pixel.