## 4 Bibliometric Analysis
### Influential journals, Authors, and Countries  
#### 4.2.1 The Most Productive Journals  
In this subsection, the authors have listed the journals that have made outstanding contributions to the field of image-based road crack detection algorithms. A total of 122 different journals published the collected 305 papers. The authors extracted the top 10 publication sources based on the number of papers published. These 10 journals published a total of 124 (40.66%) of the 305 papers. The remaining 181 (59.34%) papers were \begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Reference** & **Journal** & **Country** & **Year** & **Citation** & **Average Citation per Year** \\ \hline
[14] & Construction and Building Materials & USA & 2017 & 652 & 108.67 \\ \hline
[27] & Computer-Aided Civil and Infrastructure Engineering & China & 2017 & 651 & 108.50 \\ \hline
[28] & IEEE Transactions on Image Processing & China & 2019 & 491 & 122.75 \\ \hline
[26] & IEEE Transactions on Intelligent Transportation Systems & USA & 2020 & 470 & 156.67 \\ \hline
[39] & IEEE Transactions on Intelligent Transportation Systems & Portugal & 2013 & 334 & 33.40 \\ \hline
[40] & IEEE Transactions on Intelligent Transportation Systems & France & 2016 & 301 & 43.00 \\ \hline
[41] & Computer-Aided Civil and Infrastructure Engineering & South Korea & 2019 & 299 & 74.75 \\ \hline
[42] & Automation in Construction & Vietnam & 2018 & 213 & 42.60 \\ \hline
[43] & Computer-Aided Civil and Infrastructure Engineering & Spain & 2014 & 210 & 23.33 \\ \hline
[30] & Computer-Aided Civil and Infrastructure Engineering & Australia & 2020 & 197 & 65.67 \\ \hline
[44] & Computer-Aided Civil and Infrastructure Engineering & USA & 2019 & 195 & 48.75 \\ \hline
[45] & Journal of Computing in Civil Engineering & China & 2018 & 190 & 38.00 \\ \hline
[31] & IEEE Transactions on Intelligent Transportation Systems & USA & 2020 & 181 & 60.33 \\ \hline
[32] & Structural Control and Health Monitoring & China & 2020 & 162 & 54.00 \\ \hline
[46] & Journal of Computing in Civil Engineering & USA & 2018 & 162 & 32.40 \\ \hline
[47] & Automation in Construction & China & 2020 & 146 & 48.67 \\ \hline
[48] & Construction and Building Materials & Canada & 2020 & 135 & 45.00 \\ \hline
[33] & Construction and Building Materials & China & 2121 & 125 & 62.50 \\ \hline
[36] & Eurasip Journal on Image and Video Processing & Spain & 2017 & 117 & 19.50 \\ \hline
[37] & IEEE Transactions on Intelligent Transportation Systems & China & 2019 & 117 & 29.25 \\ \hline
[38] & IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing & China & 2018 & 114 & 22.80 \\ \hline
[34] & IEEE Access & Singapore & 2018 & 112 & 22.40 \\ \hline
[49] & Journal of Computing in Civil Engineering & USA & 2020 & 109 & 36.33 \\ \hline
[35] & Image and Vision Computing & China & 2017 & 108 & 18.00 \\ \hline
[29] & IEEE Transactions on Intelligent Transportation Systems & USA & 2021 & 103 & 51.50 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Summary of the most frequently referenced academic papers. published in the other 112 journals. Table 3 summarizes these most cited journals by journal name, total publications, total citations, average citations, impact factor, 5-year impact factor, publisher, and H-index. The authors have sorted the table according to the number of papers. Table 3 shows that the journal _IEEE Transactions on Intelligent Transportation Systems_ holds the top position, with 21 papers and 1817 citations. The impact factor (IF) of this journal is also quite high, at 21.47. The H-index of this journal is 13, which indicates that this journal is very influential among researchers. The journal _Automation in Construction_ ranks second, with 19 papers and 1138 citations. The top two journals on the list have very high values. The third-ranked journal, _International Journal of Pavement Engineering_, has 16 total publications, but only 230 total citations, while the other journals in the top 7 generally have more than 1000 total citations.