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Table 3 Distribution of selected studies w.r.t study type and data types

From: An analytical study of information extraction from unstructured and multidimensional big data

Category Sub category Selected studies J Ch C Total
Related to text IE Named entity recognition [9,10,11,12,13,14,15,16] 4 3 1 8
Relation extraction [17,18,19,20,21,22,23] 3 3 1 7
Entity + relation extraction [24,25,26,27,28,29] 4 1 1 6
Event extraction [30,31,32,33,34,35] 3 0 3 6
Total selected studies for text 14 7 6 27
 Related to images IE Visual relationship detection [36,37,38,39,40,41,42,43,44,45] 3 0 7 10
Text extraction from images [46,47,48,49,50,51,52,53,54,55,56,57] 3 1 8 12
Face recognition [58,59,60,61] 2 2 0 4
Total selected studies for images 8 3 15 26
 Related to audio IE Acoustic event detection [62,63,64,65,66,67,68] 4 0 3 7
Automatic speech recognition [69,70,71,72,73,74,75,76,77,78,79] 9 0 2 11
Total selected studies for audio data 13 0 5 18
 Related to video IE General information Extraction from video [80,81,82] 0 0 3 3
Text recognition [83,84,85,86,87,88,89,90,91,92] 4 1 5 10
Automatic video summarization [93,94,95,96,97,98,99] 1 2 4 7
Total selected studies for video data 5 3 12 20
Total selected studies 40 13 38 91
  1. J journal article, Ch chapter; C conference