Japanese developer Takuya Kawakami has created Cam2Snd a free application (app) that converts a camera image into sound. A bright part makes a high-pitched tone and a dark part makes a low-pitched tone. VoiceOver function must be disabled while using. The developer writes, "The aim of this App is to recognise rough color and shape of a dangerous or dirty object or object behind glass without touching it." Available in Japanese and English.
We have not yet tried this app and hope that you will tell us about it if you try it.