An Overview of Augmented Reality
Round 1
Reviewer 1 Report
The paper presents an overview of Augmented Reality applications, highlighting the limitation concerning the design of these systems and the possible future fields of application.
The paper is well structured and easy to follow, but there are some issues that I will mention below:
- first of all, “Augmented Reality” term should appear only in the beginning with capital letters, then only its abbreviation (AR) throughout the article; it appears in various ways in the manuscript (with capital letters, with lowercase letters, abbreviation) and it is tedious for the reader; the same thing for “Virtual Reality” - it should appear only one time in this way, and after that refer it as “VR”;
- there is a wide specialized literature on AR applications and more works should be cited; for instance, on line 95, when referring to maintenance in automotive sector or to video games, you could add some references; also, in chapter 2, more citations can be added;
- for Figure 6, please check the copyright politics from publisher to see if you have permission to use the picture;
- the reference to a figure should be made before the appearance of that figure (see Figure 3);
- line 6 is blank;
- please check some formulations (for instance, “speed meter”, on line 75) or phrases (for instance, line 324) to see that they make sense or are appropriate in that context.
Author Response
Dear Reviewer, attached you can find the response to your comments.
Best regards
Fabio Arena, Mario Collotta, Giovanni Pau and Francesco Termine
Author Response File: 
Author Response.pdf
Reviewer 2 Report
The manuscript can be published without modifications since it presents an adequate structure and originality for the field of educational technology.
Author Response
Dear Reviewer, attached you can find the response to your comments.
Best regards
Fabio Arena, Mario Collotta, Giovanni Pau and Francesco Termine
Author Response File: Author Response.pdf
Reviewer 3 Report
This paper reviews AR and its applications. The paper is written well and easy to understand. My suggestions are as follows:
- In Section 3.1, mainstream AR SDK like ARCore for Android, or ARKit for iOS should be compared in AR software section.
- The well-know AR HMD Magic Leap should be discussed in AR hardware section.
- CNN appears in conclusion, but CNN is not mentioned at all in the preceding part of the paper.
- Finally, the future of AR and its role in Metaverse could be addressed. "AR is the place where real Metaverse is going to happen" as said by John Hanke, Founder of Niantic Labs.
Author Response
Dear Reviewer, attached you can find the response to your comments.
Best regards
Fabio Arena, Mario Collotta, Giovanni Pau and Francesco Termine
Author Response File: Author Response.pdf
Reviewer 4 Report
The title of the article suggests a comprehensive study of Augmented Reality. Unfortunately, the reader is disappointed after reading the article.
It is true that the definitions at the beginning of the article and the "history of development" of VR, AR present the background quite comprehensively. But the article has many shortcomings.
In general:
there is no research questions,
there is no methodology.
More specifically:
Page 3, lines 93-94: "This work presents an overview of the main applications of augmented reality, paying particular attention to its application to the industry of tomorrow." is written. This suggests that the relationship between AR and industry 4.0 will be discussed in the rest part of the manuscript. Thus, the address could have been clarified. But this is not the case, as other applications have been listed in the following section, but not systematically.
In Chapter 2, “Applications in Augmented Reality, the applications should have been broken down thematically into subheadings. Eg Education, Healthcare, Entertainment, etc.
Page 6, lines 213-214: "These objects are controlled based on the movements implemented by the user (Figure 6) [19]." This refers to Figure 6, but on the next page under Figure 6 there is another reference to [18]. This seems a contradiction. In addition, reference [19] mentions the System Usability Scale. I'm not sure the references are accurate. Please check all your references.
Page 8, lines 271- 272: "The term “semantic web” was coined by Tim Bernes-Lee" is written. Here a reference is missing.
Page 11, lines 405-406: "In particular, by making an overview of the research activities included in 96 relevant documents, published from 2011 to 2018, ..." is written. The question is how the authors have chosen these relevant publications? Have they checked, analyzed all these publications?
Other remarks:
There are excellent publications in the MDPI database which are relevant to the above-mentioned topics: VR, AR, industry 4.0, etc. Moreover, they are up-to-date. Please make a systematic review and refer to some of them.
To sum it up, the manuscript could be innovative and an excellent overview as it was its original goal, after a major rewriting. I encourage the authors to rewrite their manuscript. After increasing the quality of this manuscript it could be a gap-filling overview of AR and industry 4.0.
Author Response
Dear Reviewer, attached you can find the response to your comments.
Best regards
Fabio Arena, Mario Collotta, Giovanni Pau and Francesco Termine
Author Response File: Author Response.pdf
Round 2
Reviewer 4 Report
Dear Authors,
I understand that this paper represents the opening of a Special Issue therefore it doesn't show a research work.
Thank you very much to the authors that they have rewritten your manuscript including my suggestions. The quality of it has increased significantly.
In spite of the fact that the paper is publishable, it needs a bit more references for the new parts. Please insert some new references to the statements that you have written in the "red written" parts of the paper, especially for the quote.
To sum it up, after minor revision I suggest this paper for publication.
Author Response
Dear reviewer, after having carried out a general review of the article, we have proceeded to add some references in the parts written in red, as you suggested. Thank you for your valuable advice, and we hope that the paper can be published immediately.
Sincerely
F. Arena, M. Collotta, G. Pau and F. Termine
