Arrangement and method for determining target distance and adjusting reading parameter of imaging reader based on target distance

• Main Authors: WITTENBERG CARL D, GOREN DAVID P, KUCHENBROD HARRY E, TAN CHINH
• Format: Patent
• Language: Chinese; English
• Published: 29.07.2022
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; HANDLING RECORD CARRIERS; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION; PRESENTATION OF DATA; RECOGNITION OF DATA; RECORD CARRIERS

A distance to a target to be read by image capture within a range of working distances is determined by directing an aiming spot to the target along an aiming axis, and by capturing a first image of the target containing the aiming spot, and by capturing a second image of the target without the aiming spot. Each image is captured in a frame over a field of view having an imaging axis offset from an aiming axis. The image preprocessor compares first image data from the first image with second image data from the second image over a common fractional region of the two frames to obtain a position of the aiming spot in the first image, and determines a distance to the target based on the position of the aiming spot in the first image. 通过将瞄准光斑沿着瞄准轴引导到目标，并通过捕获包含瞄准光斑的目标的第一图像，以及通过捕获没有瞄准光斑的目标的第二图像来确定到在工作距离的范围内要通过图像捕获读取的目标的距离。每个图像在视场上的帧中被捕获，该视场具有从瞄准轴偏移的成像轴。图像预处理器在两个帧的共同分数区域上将来自第一图像的第一图像数据与来自第二图像的第二图像数据进行比较，以获得瞄准光斑在第一图像中的位置，并且基于瞄准光斑在第一图像中的位置确定到目标的距离。