Abstract: A target image of a target circuit board and a gold image of a gold circuit board are taken by an image acquisition system. Fiducial points are located on the target image and on the gold image. Perspective transformation is performed on the target image using the fiducial points on the target image for reference and on the gold image using the fiducial points on the gold image for reference. After perspective transformation, an anomalous section of the target image is identified by identifying pixels that have different intensities between the target image and the gold image, the anomalous section being indicative of an unauthorized modification to the target circuit board.

Abstract: A target image of a target circuit board and a gold image of a gold circuit board are taken by an image acquisition system. Fiducial points are located on the target image and on the gold image. Perspective transformation is performed on the target image using the fiducial points on the target image for reference and on the gold image using the fiducial points on the gold image for reference. After perspective transformation, an anomalous section of the target image is identified by identifying pixels that have different intensities between the target image and the gold image, the anomalous section being indicative of an unauthorized modification to the target circuit board.

Abstract: A glide head having a portion thereof that is selectively extendable toward the rotating disk by the application of an electrical signal thereto. The extendable portion may be located on a side wing extending from a slider main body. The side wing may include a piezoelectric transducer with a relatively durable contact layer provided on the bottom portion thereof. The slider can be flown relatively close to the rotating media and the transducer can be activated to actuate the contact layer into a closer position relative to the rotating disk. The distance at which physical contact occurs may be measured.