Optical code reading terminal including frame quality evaluation processing

There is described an indicia reading terminal that can be operative to capture a succession of frames of image data of a vibrating substrate and that can be operative so that a certain frame of the succession of frames is subject to quality evaluation processing where a result of the quality evaluation processing is responsive to one or more of an incidence and sharpness of edge representations of the frame of image data. Frames that have been captured during a non-moving phase of the target are selected for decoding.