Police blame 60 % rise in illicit photography on new apps London - Arabstoday Most smartphone cameras have a built-in shutter noise to prevent the camera being used to take pictures without people's consent. But a new wave of 'silent' apps - some specifically designed for voyeurism - have been blamed for a huge rise in illicit photography in Japan. There were 1,741 incidents last year, according to a report in Mercury News, an increase of 60 per cent on the figure five years ago. The problem is blamed on the rise in 'silent camera' applications - including ones which deliberately conceal what the user is doing by putting an innocent-looking email or text message on screen while he or she photographs. There are dozens of silent camera applications already available on Android Market and iTunes store - and on Android particularly, there are several that appear to market themselves as being for stealthy photography. 'The latest applications include 'upgraded versions' that enable people to silently take photos while an email or website is displayed on the phone’s screen to provide cover for the surreptitious picture-taking,' said the report. Japanese academics have called for regulation of silent photography applications - saying that they are being used for crimes. mail online .