Image noise reduction device and method thereof

An image noise reduction device, comprising:

• a processing circuit configured to obtain a noise-reduced image according to an image noise reduction program, the image noise reduction program comprising:
• receiving an original image, wherein the original image comprises a plurality of image pixels, each of the image pixels has an image pixel value and a fixed noise value, and the fixed noise value comprises a decimal;
• obtaining a bit-shifted image pixel value, a bit-shifted fixed noise value, and a random number according to a number of bits of the decimal, the image pixel values, and the fixed noise values;
• obtaining a bit-shifted noise-reduced image pixel value according to the bit-shifted image pixel value, the bit-shifted fixed noise value, the random number, and a reduction equation of the form:
• O=I−F2+R, wherein
• O is the bit-shifted noise-reduced image pixel value, I is the bit-shifted image pixel value, F2 is the bit-shifted fixed noise value, and R is the random number;
• obtaining a noise-reduced image pixel value according to the number of bits of the decimal and the bit-shifted noise-reduced image pixel value;
• and
• obtaining a noise-reduced image according to the noise-reduced image pixel values;
• wherein the processing circuit is configured to obtain the bit-shifted image pixel value, the bit-shifted fixed noise value, and the random number through a parameter obtaining program according to the number of bits of the decimal, the image pixel value, and the fixed noise value, the parameter obtaining program comprising:
• obtaining the random number according to the number of bits of the decimal and a random function;
• obtaining the bit-shifted image pixel value according to the number of bits of the decimal and the image pixel value;
• and
• obtaining the bit-shifted fixed noise value according to the number of bits of the decimal and the fixed noise value.