Deep Learning-Based Wavelet Threshold Function Optimization on Noise Reduction in Ultrasound Images

Table 1

Evaluation indexes of image denoising.

Evaluation level	Relative scale	Decision scale
1	The best image set is obtained	Very good
2	Better than average of the image set	Preferable
3	Average level of the image set	Common
4	Lower than image set average	Poor
5	The worst image concentration	Very bad