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

Algorithm 1

FSC2: frame sequence count check.

	Input: : set of all frames in a CSL video
	Output: : set of all keyframes
	foreach framedo
	flowGunnar_FarnebäckOpticalFlow (, )
	foreach element in flow do
	polarze
	Call Wrapper (A)
	Call Reduction (CK)
	end
	end
	Function Wrapper ():
	mean ()//selector
	if, then, ;
	else Bo, ;
	//sequencer
	for each , do
	Findsequencecount, s
	if (), then ;
	else if (), then ;
	else if (), then ;
	end
	return
	End Function
	Function Reduction ():
	//Find the sequence count, s
	//S-reduction
	if s = = 2, then
	if , then
	;
	end
	if s = = 3, then
	if , then
	;
	else ;
	end
	if then
	//P-reduction
	for all frames f sequence, do
	pd subtract
	end
	if , then ;
	end
	return
	End Function