Abstract: Testing a video transmission system includes generating an optical signal and varying the colour by sweeping through a colour range. A first optical sensor captures the optical signal at intervals to generate frames. Transmitted frames are received by a second communication device. Received frames are provided to a display of the second communication device to reconstruct the frames. Colour information of frames displayed is obtained by a second optical sensor. Colour information of successive reconstructed frames is compared to determine deviation in capture rate of two successive frames of the first optical sensor, delay between capturing a frame by the first optical sensor and displaying the frame by the display, deviation in display rate of two successive frames displayed by the display and/or a loss of a frame. Audio information may be utilized in video and, conversational latency, synchronization between video and audio, and audio synchronization measurements.

Abstract: Testing a video transmission system includes generating an optical signal and varying the colour by sweeping through a colour range. A first optical sensor captures the optical signal at intervals to generate frames. Transmitted frames are received by a second communication device. Received frames are provided to a display of the second communication device to reconstruct the frames. Colour information of frames displayed is obtained by a second optical sensor. Colour information of successive reconstructed frames is compared to determine deviation in capture rate of two successive frames of the first optical sensor, delay between capturing a frame by the first optical sensor and displaying the frame by the display, deviation in display rate of two successive frames displayed by the display and/or a loss of a frame. Audio information may be utilized in video and, conversational latency, synchronization between video and audio, and audio synchronization measurements.

Abstract: The present disclosure relates to a method for testing a device and a testing apparatus and a computer program product for implementing the method. The method comprises simulating a touch on a touch panel; obtaining information of a response of the touch panel to the simulated touch; and using the response information to determine one or more properties of the device. The simulating comprises providing an optical signal towards a surface of the touch panel; and converting the optical signal to another physical phenomenon on the surface of the touch panel by a converting element.