TROUBLE SHOOT PRIZMO TRIAL
Finding the correct distance between the document and the camera lens takes some trial and error, and it's not always the distance that the app instructions recommend.
These apps need good light as they will not work in very dim lighting conditions. (The iPhone 4S has a more sophisticated camera than the iPhone 4, but the slight improvement in performance is not enough to warrant getting the 4S.) Lighting conditions were the same for all tests. For this review, each app was tested three times using a printed sheet (a letter), a glossy page from a magazine, and a book page, on both an iPhone 4 and an iPhone 4S. SayText and TextDetective are designed specifically for people with visual impairments. The apps reviewed here are SayText, Prizmo, and TextDetective. Although these apps do not have all the capabilities of the pioneering K-NFB Reader Mobile, they are extremely inexpensive, and no additional screen reader is necessary.
Users of iOS devices (iPhone, iPod touch, iPad, etc.) now have several choices for OCR apps. The K-NFB Reader, Nokia phone, and separate screen reader can be a very expensive combination. That software, however, can only be used on a limited number of Nokia cell phones, which not all carriers support, and although the K-NFB Reader Mobile is self-voicing (which makes the cell phone fully accessible), a separate screen reader program must be purchased and installed. The K-NFB Reader Mobile's software, an Optical Character Recognition (OCR) program, was developed by Ray Kurzweil and the National Federation of the Blind. When the K-NFB Reader Mobile was released in January 2008, it revolutionized how people with visual impairments could scan and read printed materials using their cell phone camera.
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