Graphical Component Delivery for Set-Top Terminals with Aspect Ratio Adaptation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Cable operators face challenges in delivering graphical components to set-top terminals with conflicting aspect ratios, as existing methods either provide unsatisfactory distorted images or double bandwidth by broadcasting separate signals for 4:3 and 16:9 displays.
Innovation Solution
Generating multiple versions of graphical components formatted for respective aspect ratios and transmitting them through a communications network, with user terminals selecting the appropriate version based on display characteristics and optionally converting pixel resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a single graphical component is broadcast to all set-top terminals, then transmission bandwidth is conserved, but the image appears distorted on displays with mismatched aspect ratios
Solution Approach 1:
The graphical component is segmented into multiple versions, each formatted for a specific aspect ratio (e.g., 4:3 and 16:9). The set-top terminal receives the segmented versions and selects the appropriate one based on its display characteristics, thereby avoiding distortion while efficiently using bandwidth by only transmitting and processing necessary segments.
Solution Approach 2:
Different versions of the graphical component are provided with different local qualities optimized for specific aspect ratios. The set-top terminal selects the version with the appropriate local quality matching its display, ensuring optimal image quality without transmitting all possible versions to all terminals.
2Manufacturing precision
If multiple versions of graphical components are broadcast for different aspect ratios, then image display quality is improved, but transmission bandwidth is doubled
Solution Approach 1:
The graphical component data is segmented into multiple versions, each optimized for a specific aspect ratio. This segmentation allows the system to provide high-quality images for different display types without transmitting redundant data, as each segment is specifically tailored to its target display format.
Solution Approach 2:
The system changes the format parameter of the graphical component to match different aspect ratios. By dynamically adjusting the format parameter based on the set-top terminal's display characteristics, the system delivers optimal image quality without the need to transmit all possible format variations to all terminals.
3Area of stationary object
If image processing techniques are applied to stretch a 4:3 image to 16:9, then the image fills the television screen, but the image appears distorted
Solution Approach 1:
Instead of applying image processing to stretch a single version, the graphical component is segmented into multiple pre-formatted versions. Each version is natively optimized for its target aspect ratio, eliminating the need for stretching operations and preserving geometric accuracy while ensuring full screen utilization.
Solution Approach 2:
Rather than taking a 4:3 image and stretching it to fill a 16:9 screen (which causes distortion), the system inverts the approach by providing a native 16:9 version that is specifically formatted to fill the screen without distortion. The set-top terminal selects the appropriate native version based on display characteristics.
Data Source
AI summary
A system and method are provided for delivering data including graphical components to user terminals through a communications network, e.g., a cable TV network. In one embodiment, multiple versions of a graphical component of a program guide, each formatted for a respective aspect ratio of a user's TV, are generated. On the other hand, a single version of non-graphical program guide data may also be generated. A data stream containing the non-graphical data and the multiple versions of the graphical component is transmitted to set-top terminals in the network via a transmission channel. If a graphical component is desired, the set-top terminal retrieves from the data stream a selected version of the graphical component that is compatible with the aspect ratio of the TV to which it is connected.