Last Update: 7/30/2018
From version 2015, Origin supports Pseudo-Frequency as the axis scale in Continuous Wavelet's output image plot. To use the Pscudo-Frequency axis scale, check the Use Pscudo-Frequency check box on the cwt dialog box. The cwt image generated will be Pseudo-Frequency scale.
If you don't like the tick labels Origin generated, you can calculate the tick locations and labels manually and then use these tick locations and labels in the cwt image. Origin provides a Pseudo-Frequency column which makes it easier to do.