High-end cars can carry as many as eight cameras to visually aid parking or trigger emergency brakes. That number could reach 12 when cameras replace side-view mirrors, according to Mcnex Co Ltd, a phone camera supplier of Samsung Electronics Co Ltd and Korea's biggest car camera maker.

As the technology reaches mid and lower-end cars, the market for vehicle cameras could grow seven-fold from 2011 to nearly USD 6.6 billion in 2018, said Techno Systems Research.

That amount can only rise with regulation such as compulsory rear cameras in the United States from 2018 to stop drivers backing into pedestrians. Also adding to demand will be the spread of camera-laden self-driving vehicles like those of Google Inc.

"We expect the vehicle camera market to experience explosive growth," Lee Hyo cheol, a principal research engineer at Korean auto parts maker Hyundai Mobis Co Ltd, said.

But cameras have to be far more robust for cars than phones. They must withstand tests that include days of submersion in water and 1,000 hours of temperatures shifting within seconds between minus 40 degrees and plus 85 degrees Celsius.

"Vehicle cameras are completely different from mobile cameras in terms of specifications," Lee said. Phone camera makers have had to face a steep learning curve, he said.

Cameras for cars are priced around USD 32 each compared with USD 4 for phones, according to Mcnex, which earned 19 percent of revenue last year from car cameras versus 2 percent in 2007. Prices could fall, however, as volume grows.

About 83 million car cameras are likely to be sold in 2020, five times more than in 2012, said researcher IHS Automotive. By comparison, shipments of smartphones which generally feature two cameras will likely grow 6 percent in 2018 from 39 percent last year, according to researcher IDC.