Allocation of available bits to represent different portions of video frames captured in a sequence

A non-transitory computer-readable storage medium carrying one or more sequences of instructions for causing a system to represent a video frame using an available number of bits, wherein execution of said one or more sequences of instructions by one or more processors contained in said system causes said system to perform a method for representing a video frame using an available number of bits, the method comprising:

• identifying a region of interest (ROI) in a video frame;
• determining a first portion in a reference frame substantially matching said ROI in said video frame, wherein said reference frame is a time instance earlier than said video frame;
• computing a first complexity parameter signifying a change in pixel values in said ROI in said video frame relative to said first portion in said reference frame,
• computing a first quantization parameter having positive correlation with each of said first complexity parameter and a ratio of an area of said ROI to an area of said video frame;
• encoding a first set of pixel changes based on said first quantization parameter to generate a first set of encoded pixels, wherein said first set of pixel changes represents changes of said ROI in said video frame in relation to said first portion in said reference frame;
• generating an encoded video frame representing said video frame comprising said first set of encoded pixels;
• receiving said video frame and said reference frame, wherein each of said video frame and said reference frame represent images of a scene, with said reference frame representing said scene at a time instance earlier than said video frame;
• determining a second portion in said reference frame matching a non-ROI region in said video frame
• computing a second complexity parameter signifying a change in pixel values in said non-ROI in said video frame relative to said second portion in said reference frame;
• receiving a second quantization parameter for said video frame;
• computing a third quantization parameter proportionate to said first complexity parameter;
• and
• encoding a second set of pixel changes using said third quantization parameter to generate a second set of encoded pixels, wherein said second set of pixel changes represents changes of said non-ROI in said video frame in relation to said reference frame, wherein said generating said encoded video frame representing said video frame further comprises said second set of encoded pixels.

A computer system, comprising:

• a bus,
• a processor coupled to the bus;
• and
• a non-transitory computer readable storage medium coupled to the bus and comprising instructions tangibly stored therewith, which when executed by the processor, cause the computer system to perform a a method for representing a video frame using an available number of bits, the method comprising:
• identifying a region of interest (ROI) in a video frame;
• determining a first portion in a reference frame substantially matching said ROI in said video frame, wherein said reference frame is a time instance earlier than said video frame;
• computing a first complexity parameter signifying a change in pixel values in said ROI in said video frame relative to said first portion in said reference frame,
• computing a first quantization parameter having positive correlation with each of said first complexity parameter and a ratio of an area of said ROI to an area of said video frame;
• encoding a first set of pixel changes based on said first quantization parameter to generate a first set of encoded pixels, wherein said first set of pixel changes represents changes of said ROI in said video frame in relation to said first portion in said reference frame;
• generating an encoded video frame representing said video frame comprising said first set of encoded pixels;
• receiving said video frame and said reference frame, wherein each of said video frame and said reference frame represent images of a scene, with said reference frame representing said scene at a time instance earlier than said video frame;
• determining a second portion in said reference frame matching a non-ROI region in said video frame
• computing a second complexity parameter signifying a change in pixel values in said non-ROI in said video frame relative to said second portion in said reference frame;
• receiving a second quantization parameter for said video frame;
• computing a third quantization parameter proportionate to said first complexity parameter;
• and
• encoding a second set of pixel changes using said third quantization parameter to generate a second set of encoded pixels, wherein said second set of pixel changes represents changes of said non-ROI in said video frame in relation to said reference frame, wherein said generating said encoded video frame representing said video frame further comprises said second set of encoded pixels.