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

Journal of Big Data

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

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
Related to audio IE	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