id	keyword
american_scientific_journal-4581	image
american_scientific_journal-4581	sky
american_scientific_journal-4581	transmittance
american_scientific_journal-4581	dehazing
american_scientific_journal-4581	light
american_scientific_journal-4581	method
american_scientific_journal-4581	fog
american_scientific_journal-4581	effect
american_scientific_journal-4581	equation