The invention features an image reader and a corresponding method for capturing a sharp
distortion free image of a target, such as a one or two-dimensional bar code. In one embodiment, the image reader comprises a two-dimensional
CMOS based
image sensor array, a timing module, an illumination module, and a control module. The time during which the target is illuminated is referred to as the illumination period. The capture of the image by the
image sensor array is driven by the timing module that, in one embodiment, is able to simultaneously
expose substantially all of the pixels in the array. The time during which the pixels are collectively activated to photo-convert incident light into charge defines the
exposure period for the
sensor array. In one embodiment, at least a portion of the
exposure period occurs during the illumination period.