Below is video, which shows the recognition of DataMatrix code, made the developed library. As can be seen from the video, the recognition is carried out on all corners.
    
A new version is available for download. VidikonReader - free barcode reader. VidikonReader lets you decode barcode images via a image file or your webcam. Supported image formats: BMP; JPEG; PNG; GIF; TIFF. Supported barcodes: Aztec, Small Aztec, DataMatrix, PDF417. Attention! Allowed only non-commercial use of the program!
    
Online service for resizing images. You can send images of different type and change its size. You can convert images to gray scale.
    
The most important criterion for the effectiveness of pattern recognition is the probability of correct recognition of unknown objects. The more information about the object, the higher the accuracy of recognition. But in practice there are limitations that do not allow an increase in the amount of measurement data without loss of performance. It is therefore necessary to optimize the recognition system so that the reliability and performance to satisfy the conditions of operation.