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CamScanner is a Chinese mobile app first released in 2010 [1] [2] that allows iOS and Android devices to be used as image scanners. [3] It allows users to 'scan' documents (by taking a photo with the device's camera) and share the photo as either a JPEG or PDF. This app is available free of charge on the Google Play Store and the Apple App Store.
Barcode Scanner scanning a QR code. The application Barcode Scanner is an Android app, from the open-source project ZXing (short for Zebra Crossing), that allows an Android device with imaging hardware (a built-in camera) to scan barcodes or 2D barcodes and retrieve the data encoded. [2]
The QR code system was invented in 1994, at the Denso Wave automotive products company, in Japan. [6] [7] [8] The initial alternating-square design presented by the team of researchers, headed by Masahiro Hara, was influenced by the black counters and the white counters played on a Go board; [9] the pattern of the position detection markers was determined by finding the least-used sequence of ...
When the skewed scan straddles rows 6 and 7, then the scanner sees noise. When the scan is on row 7, the scanner sees symbols in cluster 0. Consequently, the scanner knows the direction of the skew. By the time the scanner reaches the right, it is on row 10, so it sees cluster 0 patterns. The scanner will also see a constant stop pattern.
The codes should be well lit. Shadow makes it more difficult to scan. Avoid reflected glare (particularly when laminating the codes or placing them behind glass). Larger codes will scan more effectively. 2 inches (5 cm) across will allow for distance and older smartphones with lower quality cameras. 1 inch (2.5 cm) should be the minimum.
The OMR software then works with a common desktop image scanner with a document feeder to process the forms once filled out. OMR is generally distinguished from optical character recognition (OCR) by the fact that a complicated pattern recognition engine is not required. That is, the marks are constructed in such a way that there is little ...
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