One step denoising (using NLM or DCT)

• Roof : medium noise, plain areas
• Flying birds : medium noise, plain areas
• Two birds : medium noise

Two step denoising (NLM + CWT)

• Twilight : High noise and banding
• Cars : High intensity noise

Three step denoising (with color noise)

• Girl : High intensity and color noise
• Lena jpeg : Highly compressed jpeg