Documentation

Detector

Interfaces, Classes and Traits

AlignmentPattern: Encapsulates an alignment pattern, which are the smaller square patterns found in all but the simplest QR Codes.
AlignmentPatternFinder: This class attempts to find alignment patterns in a QR Code. Alignment patterns look like finder patterns but are smaller and appear at regular intervals throughout the image.
Detector: Encapsulates logic that can detect a QR Code in an image, even if the QR Code is rotated or skewed, or partially obscured.
FinderPattern: Encapsulates a finder pattern, which are the three square patterns found in the corners of QR Codes. It also encapsulates a count of similar finder patterns, as a convenience to the finder's bookkeeping.
FinderPatternFinder: This class attempts to find finder patterns in a QR Code. Finder patterns are the square markers at three corners of a QR Code.
GridSampler: Implementations of this class can, given locations of finder patterns for a QR code in an image, sample the right points in the image to reconstruct the QR code, accounting for perspective distortion. It is abstracted since it is relatively expensive and should be allowed to take advantage of platform-specific optimized implementations, like Sun's Java Advanced Imaging library, but which may not be available in other environments such as J2ME, and vice versa.
PerspectiveTransform: This class implements a perspective transform in two dimensions. Given four source and four destination points, it will compute the transformation implied between them. The code is based directly upon section 3.4.2 of George Wolberg's "Digital Image Warping"; see pages 54-56.
ResultPoint: Encapsulates a point of interest in an image containing a barcode. Typically, this would be the location of a finder pattern or the corner of the barcode, for example.