Method of compression for wide angle digital video
First Claim
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1. A method of intelligently compressing a stream of wide angle video images by applying varying compression methodology to selected regions of interest (RoI), comprising the steps of:
- using a detection algorithm for determining a plurality of regions of interest in an image frame of the video,encoding the regions of interest of video using only intra-frame information by computing a linear transform of the image pixels to generate transform domain coefficients, quantizing the transform domain coefficients and representing the quantized coefficients in binary form,compressing the exterior regions of interest using plurality of image frames of the video, andcombining said compressed exterior regions of interest with said encoded regions of interest to create a bitstream representing the plurality of image frames of the video.
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Abstract
A system and method for varying the level of detail encoded in a video. In a preferred embodiment, some regions of a wide-angle video scene are encoded in an almost lossless manner, while other regions are encoded with less detail. Regions of interest can be determined in many ways, including a priori, automatically in real time, or by the selection of human operators.
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Citations
20 Claims
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1. A method of intelligently compressing a stream of wide angle video images by applying varying compression methodology to selected regions of interest (RoI), comprising the steps of:
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using a detection algorithm for determining a plurality of regions of interest in an image frame of the video, encoding the regions of interest of video using only intra-frame information by computing a linear transform of the image pixels to generate transform domain coefficients, quantizing the transform domain coefficients and representing the quantized coefficients in binary form, compressing the exterior regions of interest using plurality of image frames of the video, and combining said compressed exterior regions of interest with said encoded regions of interest to create a bitstream representing the plurality of image frames of the video. - View Dependent Claims (2, 3, 4, 6, 7, 8, 9, 10)
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5. The method of clim 1 in which the quantized transform domain coefficients are encoded in binary form using coding selected from the group consisting of:
- Huffman coding and arthmetic coding.
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11. A computer readable medium containing programming instructions for intelligently compressing stream of video image frames by applying varying compressions methodology to selected regions of interest (RoI), comprising the steps of
using a detection algorithm for determining a plurality of regions of interest in an image frame of the video, encoding the regions of interest of video using only intra-frame information by computing a linear transform of the image pixels to generate transform domain coefficients, quantizing the transform domain coefficients using lower quantization steps for transform domain coefficients and representing the said quantized coefficients in binary form, compressing the exterior of regions of interests using a plurality of image framed of the video, and combining the compressed exterior of RoIs with encoded RoIs to create a bitstream representing the plurality of image frames of the video.
Specification