Thumbnail Generation for Video Playback Content Identification
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Solution Overview
Problem
Conventional digital cameras and cellular phones cannot simultaneously play multiple videos, and thumbnail displays of video beginnings do not accurately represent the content, requiring individual playback for each video to understand its subject matter.
Innovation Solution
A video playback device and method that generates and stores thumbnail images for multiple videos, allowing for a list display and selection of these images, with the option to replay the corresponding video in reduced size at the thumbnail's display position, facilitating easy identification of video content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If thumbnail images are generated from the beginning frames of videos, then the thumbnail display is simple and fast, but the thumbnail does not accurately represent the video content when the beginning frame is not representative
Solution Approach 1:
The system performs preliminary scanning of video files to identify representative frames before generating thumbnails. By pre-analyzing video content to find frames that best represent the video subject matter, the system ensures accurate content representation while maintaining efficient thumbnail generation. This preliminary action resolves the contradiction by preparing the data in advance rather than simply using the first frame.
2Loss of information
If individual playback is performed for each video to understand its content, then accurate content identification is achieved, but the process becomes troublesome and time-consuming
Solution Approach 1:
The system introduces an intermediary representation (enhanced thumbnail with representative frame display) that mediates between the video file and the user. Instead of requiring direct playback of each video, the intermediary thumbnail provides sufficient visual information about video content, allowing users to identify video subjects without time-consuming individual playback while maintaining accurate content identification.
3Productivity
If multiple videos are played back simultaneously, then content identification efficiency is improved, but device complexity increases
Solution Approach 1:
The system creates visual copies (thumbnails) of video content that can be displayed and examined simultaneously without requiring simultaneous playback of multiple video streams. By working with static thumbnail copies rather than active video streams, the system achieves efficient content identification while avoiding the complexity of managing multiple simultaneous playback operations.
Data Source
AI summary
When an album mode is selected by a predetermined operation, thumbnail image data is acquired corresponding to saved video files which are retrieved from a thumbnail image data storage area (1495) and a list display of the thumbnail images is shown in the main display section (102) based on the thumbnail image data of each video file. When one of the thumbnail images is selected by the user, the operation judges whether or not the playback time for a video file of a selected thumbnail image is longer than a predetermined playback time. If shorter than a predetermined playback time, a normal playback is performed in the display position of the thumbnail image during which the thumbnail image scale-size is reduced.