Method for extracting features from a flow of digital video frames, and corresponding system and computer program product

摘要

In an embodiment, digital video frames in a flow are subjected to a method of extraction of features including the operations of: extracting from the video frames respective sequences of pairs of keypoints/descriptors limiting to a threshold value the number of pairs extracted for each frame; sending the sequences extracted from an extractor module to a server for processing with a bitrate value variable in time; receiving the aforesaid bitrate value variable in time at the extractor as target bitrate for extraction; and limiting the number of pairs extracted by the extractor to a threshold value variable in time as a function of the target bitrate.

主权项

1. An apparatus, comprising:
a generator circuit configured to generate, for each data block in a sequence of data blocks, a respective at least one value that represents a respective feature of the data block; a receiver circuit configured to receive a target rate; a rate circuit configured to adjust, in response to the target rate, a generation rate at which the generator generates the values; wherein the target rate includes a target bit rate per unit of time; and wherein the rate circuit is configured:
to convert the target bit rate per unit of time into a target bit rate per data block,to determine one of a number of bits in the at least one value generated for a data block and an average number of bits in the at least one value generated for a data block, andto adjust the generation rate in response to one of a difference between the target bit rate per data block and the number of bits and a difference between the target bit rate per data block and the average number of bits.