To ensure that the barcode can be read, the barcode must first be decoded. This is done via acquiring an accurate and reliable barcode image to obtain a complete, high-contrast, and high-resolution for the camera to process. A number of technical and environmental factors affects barcode readability. Although a barcode may appear to have no noticeable flaws to the human eye, subtle inconsistencies in the code, substrate, or even the positioning of the code may result in no-reads.