Abstract: An apparatus and method for synchronizing sampling of a video signal to a video synchronization signal of the video signal are provided. The frequency-divided output of an oscillator (or other controllable frequency source) is applied as one input to a phase detector, while the other input to the phase detector is supplied by the video synchronizing signals. The error signal voltage output of the phase detector is applied to correct the frequency, and thereby the phase, of the oscillator output through a dynamically-tuned phase-locked loop filter until the phases of the two input signals are in perfect agreement and no error voltage is produced. After a delay for this phase correction, during which time all video amplification is suspended, an output of the oscillator is then applied to sample the image without the presence of phase disparities while video amplification is restored. Full dynamic range digital acquisition then proceeds with extremely high accuracy at any desired resolution.

Abstract: A method for imaging or reconstructing an image of an object includes the following steps: obtaining multiple original views of the object, each original view being obtained at a different relative orientation of the object from each other view; combining the multiple original views in an image plane to obtain a first composite image; phase inverting the first composite image to obtain a phase inverted composite image; combining the phase inverted composite image with each original view to obtain a second composite image; determining a differential between the second composite image and each original view to obtain a plurality of differentials; applying the plurality of differentials to the second composite image to obtain a resulting composite image; and optionally amplifying the resulting composite image to obtain a reconstructed image. Apparatus for carrying out the method may use analog circuitry, a high speed computer or a combination of analog and digital techniques may be used.