There are several fast publication journals that focus on image processing, including:
IEEE Transactions on Image Processing: This journal is published by the Institute of Electrical and Electronics Engineers (IEEE) and focuses on research related to image processing, including image enhancement, restoration, segmentation, and analysis. It typically takes around 3-6 months to get a decision on a submitted manuscript.
IEEE Signal Processing Letters: Another publication from IEEE, this journal focuses on research in signal processing, including image processing, audio processing, and speech processing. The journal aims to provide a rapid turnaround time for accepted manuscripts, with a typical review time of around 2-3 months.
Journal of Real-Time Image Processing: This Springer journal focuses on research related to real-time image and video processing, including algorithms, architectures, and systems. The journal has a fast publication process, with accepted papers published online within a few weeks of acceptance.