Image Processing Apparatus Brightness Correction for Narrow Dynamic Range Displays
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Solution Overview
Problem
Display apparatuses with narrower dynamic ranges than actual subjects result in videos appearing darker when outputting absolute brightness display mode videos, requiring time-consuming manual brightness correction for each scene, and existing techniques do not address videos displayed on narrower dynamic range devices.
Innovation Solution
An image processing apparatus generates correction information to adjust video signals for display on narrower dynamic range devices, incorporating a brightness correction unit that associates and stores this information with the video signal, ensuring suitable brightness across different display apparatuses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If video is captured in absolute brightness display mode for wide dynamic range display, then realistic brightness representation is achieved, but video appears dark when displayed on narrow dynamic range devices
Solution Approach 1:
The patent applies preliminary action by generating correction information during the video capture phase. The imaging apparatus pre-calculates and embeds correction data that accounts for potential display on narrow dynamic range devices, so that when the video is later played back on such devices, the correction can be automatically applied without requiring manual intervention or re-shooting.
Solution Approach 2:
The patent utilizes parameter changes by adjusting brightness parameters based on the target display device's dynamic range characteristics. The correction information modifies the video signal's brightness parameters dynamically, transforming the absolute brightness encoded video into a form suitable for relative brightness display devices, thereby resolving the contradiction between maintaining original brightness accuracy and adapting to different display capabilities.
2Illumination intensity
If manual brightness correction is performed for each captured scene, then appropriate brightness is achieved, but time-consuming editing process occurs
Solution Approach 1:
The patent implements self-service by enabling the imaging apparatus to automatically generate and embed correction information without requiring external editing intervention. The system serves itself by performing the brightness correction function that would otherwise require manual editing, thereby eliminating time loss while maintaining brightness accuracy. The correction is applied automatically during playback based on the embedded metadata.
3Adaptability or versatility
If conventional automatic exposure control is used, then video appears brighter on narrow dynamic range devices, but absolute brightness information is lost
Solution Approach 1:
The patent introduces an intermediary element in the form of correction information (metadata) that carries absolute brightness information through the playback chain. This intermediary allows narrow dynamic range devices to display video with appropriate relative brightness while preserving and communicating the original absolute brightness data, thus preventing information loss while maintaining compatibility.
Solution Approach 2:
The patent applies preliminary action by capturing and storing absolute brightness information during the imaging phase, before playback on narrow dynamic range devices. This pre-captured information serves as a reference that enables subsequent correction processes to restore appropriate brightness levels without losing the original absolute brightness data.
Data Source
AI summary
An image processing apparatus includes an image processing unit configured to generate a first video signal for a first display apparatus, a correction unit configured to generate, when the first video signal is displayed on a second display apparatus operative to represent a brightness range narrower than a brightness range representable by the first display apparatus, correction information for correcting brightness of the video, and a recording unit configured to associate the correction information generated by the correction unit with the first video signal and hold the associated information.