Patent ID: 7898582

Claim:
An image noise reduction method based on an optimal primary-color signal, applied for a digital camera to reduce noises in a digital image, comprising: loading a digital image, and taking out a plurality of primary-color signals of the digital image; selecting an optimal primary-color signal from the primary-color signals, and decomposing the optimal primary-color signal into a high-frequency signal and a low-frequency signal by using a high-pass filter and a low-pass filter; selecting a worst primary-color signal from the primary-color signals, and decomposing the worst primary-color signal into a high-frequency signal and a low-frequency signal by using a high-pass filter and a low-pass filter; and mixing the high-frequency signal of the optimal primary-color signal with that of the worst primary-color signal, and superposing the mixed signal to the low-frequency signal of the worst primary-color signal, so as to get a digital image signal after noise reduction.