Abstract: This disclosure describes systems that assess video content. A computing system includes an interface configured to an image captured at a destination of the video content. The computing system includes a memory configured to store the received image and at least a portion of a reference image associated with the video content. The computing system includes processing circuitry configured to detect embedded information in the image, the embedded information indicating that the image represents a frame of a test pattern of the video content. The processing circuitry is configured to utilize an implicit knowledge of the test pattern to compare at least a portion of the image to the portion of the reference image stored to the memory, and to automatically determine, based on the comparison, one or more characteristics of the video content segment as delivered at the destination.

Abstract: Techniques are disclosed for detecting a vibration of a target object using light signals and an external reference signal. In one example, a sensor detects a first signal having a first plurality of frequencies. An array of light amplitude detectors receives respective light signals from regions of the target object and generates outputs representing the received light signals. A plurality of filters receives an output of a respective light amplitude detector and generates, from the output and based on the first plurality of frequencies, filtered signals. The filtered signals relate to a vibration of the target object, and a frequency of the vibration of the region of the target object is within a frequency band defined by at least one frequency of the first plurality of frequencies. Processing circuitry processes the filtered signals to generate an output representation of the vibration of the target object.