Image enhancement circuit and method thereof

An image enhancement circuit, comprising:

• a first transformation circuit configured to receive an original image signal, and separate the original image signal into a high frequency image signal and a low frequency image signal through performing a wavelet transform;
• a second transformation circuit electrically coupled to the first transformation circuit and configured to receive the high frequency image signal, and separate the high frequency image signal into a high frequency separation signal and a high-intermediate frequency separation signal through performing the wavelet transform;
• a third transformation circuit electrically coupled to the first transformation circuit and configured to receive the low frequency image signal, and separate the low frequency image signal into a low-intermediate frequency separation signal and a low frequency separation signal through performing the wavelet transform;
• a high frequency enhancement circuit electrically coupled to the second transformation circuit and configured to receive the high frequency separation signal, and enhance the high frequency separation signal to generate an enhanced high frequency separation signal;
• a low frequency enhancement circuit electrically coupled to the third transformation circuit and configured to receive the low frequency separation signal, and enhance the low frequency separation signal to generate an enhanced low frequency separation signal;
• and
• an inverse transformation circuit electrically coupled to the second transformation circuit, the third transformation circuit, the high frequency enhancement circuit and the low frequency enhancement circuit, and configured to receive the enhanced high frequency separation signal, the high-intermediate frequency separation signal, the low-intermediate frequency separation signal and the enhanced low frequency separation signal so as to output an enhanced image signal.