关键词: 计算机应用, 图像篡改, 无限光源, 光源方向, 盲鉴别, 图像真实性

Abstract:

Inconsistency in light source direction is taken as the basis for the detection of image tampering. Focusing on the images generated under the irradiation of infinite light source, the HestenesPowell multiplier method is used to calculate the light source direction of different objects and backgrounds in an image and to determine whether the image has been tampered with. The calculation is in accordance with the error function between the measured intensity and calculated intensity, and the constraint function suitable for infinite light source model. Experiment results show that this algorithm can effectively calculate the light source direction of different objects and backgrounds in the image lased on infinite light source model, and the detection rate reaches up to 82.3%.

Key words: computer application, image tampering, infinite light source, light source direction, blind identification, image authenticity