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This is the fourth and final issue of volume 13. In 2016, two volumes consisting of eight issues were published in order to reduce the backlog of online first published articles waiting to appear in print. For the same reason, it is planned to offer two volumes of JRTIP next year, that is volume 14 and volume 15, each volume consisting of four issues for a total of eight issues in 2018. The additional volume or four issues will increase the total number of print pages to 1600 in 2018 which will greatly alleviate the backlog of accepted papers that have already appeared online and are waiting to appear in print. This step is being taken as part of our efforts to steadily shorten the time between the online and print versions of accepted articles. As normally done in the last few years, the editorial board of JRTIP will be meeting at the SPIE Conference on Real-time Image and Video Processing as part of the SPIE umbrella symposium on Defense and Commercial Sensing to be held in April 2018 in Orlando, FL, USA. The call for papers for the conference and later the tentative program of the conference can be found at this link: http://spie.org/ SIC/conferencedetails/real-time-image-video-processing. This call for paper is also included in the backmatter of this issue. We will report on the outcome of this meeting in an editorial appearing after the meeting. Before providing a brief outline of the papers in this issue, we are pleased to mention that the newly released ISI impact factor (IF) for JRTIP has gone back up to 2.010. The increase in the number of articles to appear in print in 2018 due to the additional volume is anticipated to have a positive impact on the impact factor. In order to further improve the turnaround time of the review process and the quality of the reviews, we would like to remind readers of the Reviewer Reward Programme whose details had been mentioned in our previous editorials and are described at this link: http://www.springer. com/computer/image?processing/journal/11554/PSE?de tailsPage=press. Currently, four special issues are being conducted by several guest editor teams to highlight the hot spot topics in real-time image processing. The calls for papers for these special issues can be found at this link: http://www. springer.com/computer/image?processing/journal/11554/ PSE?detailsPage=societies and in the backmatter of this issue as well. Furthermore, we would like to encourage colleagues and researchers to submit proposals for special issues. Such issues provide a collection of focused articles on contemporary subjects of interest as related to the realtime aspects of image and video processing such as computational complexity reduction compared to existing solutions, real-time hardware implementation on various processors or platforms, actual real-time processing rates, and real-time software optimization. This final issue of volume 13 is a regular issue which comprises 10 original research articles addressing different image processing topics related to the real-time theme of JRTIP. The first article by Elloumi et al. is on ‘‘Real-time camera orientation estimation based on vanishing point tracking under Manhattan World assumption’’ and addresses a real-time pipeline for estimating the camera orientation based on vanishing points for indoor navigation & Matthias F. Carlsohn [email protected]