Patent ID: 7986844
Filing Date: 2011-07-26
Classification: H04N

Abstract:
1. A method comprising: calculating a current hash value for a current tile of a currently sampled video frame that is stored in buffer memory to be accessed by a video redirection system, the tile having a first bit size, the current hash value having a second bit size, the first bit size being relatively larger than the second bit size, the current hash value being calculated by a hash algorithm that maps the tile into the current hash value; making a comparison of the current hash value to a reference hash value, the reference hash value having the second bit size and being calculated by the hash algorithm based upon a corresponding tile of another sampled video frame that was sampled prior to the currently sampled video frame, the buffer memory storing the reference hash value but lacking storage of the another sampled video frame; processing the current tile based upon result of the comparison, the processing comprising compressing the current tile, if the current hash value is different from the reference hash value, to produce a compressed tile; and transmitting the compressed tile via a network interface.