OmniVision Technologies, a maker of digital imaging chips for smartphones and other devices, said Thursday it received a buyout offer from a group of Chinese investors for some $1.6 billion.

The California group said in a statement it "received a preliminary non-binding proposal" from Hua Capital Management Ltd. to acquire the company for $29 a share.

Omnivision's board of directors "is reviewing and evaluating HCM's proposal" and has made no decision on it, it said.

The includes Shanghai Pudong Science and Technology Investment Co. Ltd., a state-owned limited liability company under the Pudong New Area government of Shanghai, according to the statement.

OmniVision, founded in 1995, has some 2,000 employees and annual revenues of $1.45 billion.

Its products are used in smartphones including Apple's iPhone and in webcams, and medical imaging equipment.