Telefonaktiebolaget Lm Ericsson (publ)

Aparna Varanasi

Bhushan Ramnani

Mark B Tozer

Keith Okabe

Hugh Hitchens

Rabih Filfili

Jeffery C Truong

Juan Flores

Zheng Nie

Satish Haridass

Swapnesh Chaubal

Xiaosong Zhu

Patrick Egloff

Exemplary methods for automatically testing closed caption (CC) rendering includes receiving a set of one or more reference audio video (AV) streams from an AV source, and generating reference CC images from the set of one or more reference AV streams starting from a recording start time to a recording stop time. In one embodiment, the method further includes receiving a set of one or more test AV streams from the AV source, and generating test CC images from the set of one or more test AV streams starting from the recording start time to the recording stop time. In one embodiment, the methods further include determining whether the AV source is performing CC rendering properly by automatically comparing the test CC images against the reference CC images.

Caption rendering automation test framework

Exemplary methods of extracting closed caption (CC) image from a frame of an audio video (AV) stream are described. For all pixels of the frame, setting a color value of the pixels to a determined pixel value when the color value of the pixel is different from a background color value associated with CC image. A set edges is analyzed to identify one or more polygons. A polygon that contains text is determined from the one or more polygons. The frame is cropped along the polygon to obtain a CC image. Upon determination that the CC image is identical to another closed caption image a frame count associated with the other closed caption image is increased by 1; and upon determination that the CC image is not identical to the other CC image the closed caption image is stored along with a position and a time value as metadata information.

Automatic extraction of closed caption data from frames of an audio video (AV) stream using image clipping

Exemplary methods of extracting closed caption images from frames of an audio video (AV) stream are described. A first set of frames of a first AV stream including CC images and a second set of frames not including the CC images are received. Each pixel in the first frame is replaced with a dummy pixel, upon determination that a pixel at a corresponding position in the corresponding frame has a same color value to generate a filtered frame including dummy pixels and non-dummy pixels. First coordinates of the top-left most pixel of the first frame that is not a dummy pixel and second coordinates of the bottom-right most pixel of the first frame that is not a dummy pixel are determined. The filtered frame is cropped along the first and second coordinates to extract the CC image.

Automatic extraction of closed caption data from frames of an audio video (AV) stream using image filtering

A server for network media program restart receives a request from a client device to restart a media program that is configured as being enabled for network media program restart subject to a set of one or more restrictions. Responsive to determining that a currently airing restriction is configured that allows the media program to be played by the client device only when that media program is currently airing in a locale of the client device and will become unavailable for viewing after a predefined amount of time has elapsed after the currently airing media program ends, the server transmits the media program to the client device for playback only responsive to a determination that at the time of the request the media program is currently airing in the locale of the client device and only when the predefined amount of time has not elapsed.

Network media program restart

Growing community of inventors

San Jose, CA, United States of America

Aparna Varanasi