Display Device Black Strip Detection Using Calibration Image
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Solution Overview
Problem
Existing image display systems face discomfort due to repeated expansion and contraction of videos when aspect ratios differ, leading to false detection of dark parts as black strips, causing repetitive size adjustments during playback.
Innovation Solution
An image display system comprising a display device and an information terminal that generates and adjusts display images by acquiring and transmitting screen adjustment information, using a calibration image with distinct brightness or hue to accurately detect and remove black strip regions, and storing this information in a database for future reference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If black strip regions are detected based on brightness level and video is expanded after removal, then black strips are removed from display, but dark parts in video are falsely detected as black strips causing repeated expansion and contraction
Solution Approach 1:
A calibration image with known characteristics is introduced as an intermediary between the detection system and the actual video content. This calibration image serves as a reference standard that enables accurate distinction between genuine black strips and dark video content, preventing false detection while maintaining reliable video playback
Solution Approach 2:
The detection parameters are dynamically adjusted based on calibration data. By changing the brightness threshold and detection criteria according to the calibration image characteristics, the system accurately identifies black strips without mistakenly detecting dark video portions, thereby ensuring both detection precision and playback stability
2Shape
If screen adjustment is performed based on detected black strips, then aspect ratio matching is achieved, but video size varies frame to frame causing user discomfort
Solution Approach 1:
The calibration image is processed in advance to establish accurate detection parameters and black strip characteristics before actual video playback. This preliminary action ensures that subsequent aspect ratio adjustments are based on stable, pre-determined parameters rather than frame-by-frame detection, eliminating size variations and ensuring smooth playback
Solution Approach 2:
The system uses the calibration image to establish a feedback mechanism that provides reference information for consistent black strip detection. This feedback loop ensures that aspect ratio adjustments remain stable across frames, preventing the expansion and contraction that causes user discomfort while maintaining proper aspect ratio matching
Data Source
AI summary
An image display system includes: a display device; and an information terminal, the display device having: a display control unit that generates a first display image having size adjustment regions added thereto, based on a video signal outputted by the information terminal; and an image transmitter that outputs the first display image generated by the display control unit to the information terminal; the information terminal having: a video output unit that outputs the video signal to the display device; a screen adjustment information acquisition unit that acquires screen adjustment information used by the display control unit to generate a display screen to be displayed on the display device, based on the first display image transmitted by the image transmitter; and an information transmitter that transmits the screen adjustment information acquired by the screen adjustment information acquisition unit to the display device, wherein the display control unit generates a second display image, based on the screen adjustment information transmitted by the information transmitter.