Abstract: An electronic device for capturing and showing images is provided. The electronic device comprises a photosensitive chip and a display screen. The photosensitive chip has a photosensitive area adapted for capturing images. The photosensitive area has a rectangular shape with a first height and a first width. The aspect ratio of the first width to the first height is smaller than 1. The display screen is adapted to output the images captured by the photosensitive chip. The display screen has a rectangular shape with a second height and a second width. The aspect ratio of the second width to the second height is smaller than 1.

Abstract: An image capture and display system contains a three-stage digital gamma correction circuit. Three equations are used to determine the gamma correction characteristics for low intensity, medium intensity, and high intensity signal levels, respectively. Linear correction is used for low and high intensity levels, and an adjustable non-linear correction is used for medium levels. The resultant effects of the combined correction characteristics are to increase the effective Signal-to-Noise ratio for low level signals, enhance the gray level differentiation for high level signals, and heighten the contrast control for medium level signals. In addition, the contrast control is effective throughout the entire range of signal intensity levels. The image capture and display system provides a high quality visual display, with a simple, economical hardware implementation of the inventive gamma correction circuit.