Keyframe Extraction Algorithm for Continuous Sign-Language Videos Using Angular Displacement and Sequence Check Metrics

Table 3

The stability of the algorithm is assessed by comparing the number of keyframes extracted, done by different signers on four sign words from Pheonix14 and How2Sign datasets.

Signs	SignWriting	m	N	Signer ID
MORGEN		8	3	Signer 1
		9	3	Signer 3
		8	3	Signer 8
GESTERN		4	2	Signer 1
		4	2	Signer 4
		4	2	Signer 8
LIEB		3	2	Signer 4
		3	2	Signer 5
		3	2	Signer 7
KNIFE		3	2	Signer 1
		4	2	Signer 2
		3	2	Signer 3

m denotes the number of frames in the original video and n denotes the number of frames in the reduced set.