ELECTRONIC SPECTACLES, ESPECIALLY NIGHT VISION SPECTACLES

摘要

The invention relates to electronic spectacles, especially night vision spectacles, comprising a spectacles part (1) which is connected by a cable (3) to a pocket part (2). At least one electronic camera, e.g., a CCD camera, (5), and at least one display (8) for viewing by the user are provided on the spectacles part (1). A battery (9) and all or part of the electronic image processing system (20) required for operating the device are located in the pocket part (2). Said electronic image processing system (20) also provides automatic contrast optimisation which is carried out automatically as light conditions change. In order to perform this function, the electronic image processing system (20) comprises an analysis circuit (21) which determines the grey value distribution (H(x)) in the image recorded by the electronic camera (5). This information is conveyed to a transformation circuit (22) which produces a modified grey value distribution H'(x)) from the original grey value distribution (H(x)) in accordance with a transformation formula ("equalisation curve"). Whilst the number and frequency of discreet grey values which appear remain the same, the location of said grey values is modified in such a way that overall there is a greater range of grey values.