Tile-Based Video Distribution System for Fast Region-of-Interest Switching
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Solution Overview
Problem
Existing image capturing systems face challenges in shortening video switching time while managing bandwidth efficiently, particularly when a region of interest is designated by a client, as the current techniques do not effectively adapt the frame interval of intra-frame compression to reduce switching time without increasing communication bandwidth.
Innovation Solution
An image capturing system that includes an image capturing apparatus and a distribution apparatus, where the apparatus can divide video images into tiles of varying resolutions, encode them using intra-frame and inter-frame compression, and dynamically adjust the frame interval of intra-frame compression based on the frequency of tile designation by a client, allowing for efficient distribution of video streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If intra-frame compression is performed frequently to reduce video switching time, then switching speed is improved, but communication bandwidth is increased
Solution Approach 1:
The patent applies local quality by differentiating compression settings for different tiles based on their importance. Tiles corresponding to regions of interest use intra-frame compression with shorter intervals, while other tiles use inter-frame compression with longer intervals. This allows the system to reduce switching time for important regions without increasing bandwidth for the entire video stream.
Solution Approach 2:
The system dynamically adjusts the frame interval for intra-frame compression based on the number of times a tile is designated as a region of interest. The encode control unit changes the frame interval of intra-frame compression frames according to the designation frequency, making the compression strategy adaptive rather than static. This dynamic adjustment optimizes the balance between switching time and bandwidth usage.
2Loss of time
If the frame interval of intra-frame compression is shortened for all tiles, then video switching time is reduced, but the code amount of video images increases
Solution Approach 1:
The patent segments the video image into multiple tiles and applies different compression strategies to each tile. Instead of uniformly applying intra-frame compression to all tiles, the system divides them into regions of interest (using intra-frame compression) and other regions (using inter-frame compression). This segmentation allows selective optimization of switching time without globally increasing code amount.
Solution Approach 2:
The system changes compression parameters (frame interval for intra-frame compression) based on tile designation frequency. Tiles that are frequently designated as regions of interest have shorter intra-frame compression intervals, while less important tiles maintain longer intervals or use inter-frame compression. This parameter differentiation reduces overall code amount while still achieving fast switching for important regions.
Data Source
AI summary
This invention provides a system including an image capturing apparatus and a distribution apparatus, wherein the image capturing apparatus includes an image capturing unit capturing images of a plurality of resolutions, a dividing unit dividing each of the images into tiles having a preset size, an encoding unit encoding images, and an output unit outputting encoded data to the distribution apparatus, and wherein the distribution apparatus includes a distributing unit distributing, as a video stream, encoded data of a tile requested by a client on a network to the client, and an encode control unit changing a frame interval of intra-frame compression of a tile corresponding to a region of interest requested from a client on a network, in accordance with the number of times of designation of the tile, and setting the changed in the encoding unit.