还有IET Image Processing，好中吗？要收费吗？

这种应该不收吧，又不是开源的。

6.1. Two Publication Options
The IET's hybrid journals offer authors a choice of publication options. Firstly, there is the standard Subscription Access option where authors assign copyright to the publisher. We are now also offering an Open Access option under one of four Creative Commons Licences, with the author retaining copyright for their work. If you choose to publish your paper Open Access please be aware that there is an Article Processing Charge (APC) of $2,000 USD. IET Cyber-Physical Systems: Theory and Applications is a fully open access journal with APCs waived in 2018.

这是要交2000美元，