Projection Apparatus Brightness Correction via Local Quality
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Solution Overview
Problem
Existing projection technologies face challenges in reducing brightness unevenness of projection images without significantly decreasing overall image brightness, particularly at the edges where light quantity is decreased.
Innovation Solution
A control device and method for a projection apparatus that corrects input image data by increasing pixel values in specific regions determined by light quantity distribution and uniformly decreasing pixel values by a controlled amount, using a correction coefficient based on the edge part light quantity ratio to maintain image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If pixel values in edge regions are increased to reduce brightness unevenness, then brightness uniformity is improved, but overall image brightness decreases
Solution Approach 1:
The patent applies local quality by differentiating correction strategies for different regions of the image. Edge regions receive brightness enhancement through multiplication by a correction coefficient, while center regions undergo uniform brightness reduction. This spatially differentiated approach allows the system to improve brightness uniformity in edge regions without causing excessive overall brightness loss, as the center regions contribute to maintaining overall luminance levels.
Solution Approach 2:
The patent employs parameter changes by dynamically adjusting the correction coefficient based on the ratio of edge region light quantity to center region light quantity. By calculating this ratio and using it to determine the correction coefficient, the system adapts the brightness correction parameters to the specific lighting conditions, thereby optimizing the balance between improving brightness uniformity and maintaining overall image brightness.
2Stability of the object's composition
If uniform brightness correction is applied across the entire image, then brightness uniformity is improved, but edge region brightness may become excessive
Solution Approach 1:
The patent implements local quality by applying different correction operations to different spatial regions. Edge region pixels are multiplied by a correction coefficient greater than 1 to enhance their brightness, while center region pixels are uniformly reduced. This regional differentiation prevents edge region brightness from becoming excessive, as each region receives a correction tailored to its specific brightness characteristics.
Solution Approach 2:
The system uses parameter changes by calculating the correction coefficient based on the measured light quantity ratio between edge and center regions. This dynamic parameter adjustment ensures that the correction strength is precisely calibrated to the actual brightness distribution, preventing over-correction in edge regions while achieving the desired brightness uniformity.
Data Source
AI summary
A control device of a projection apparatus that projects an image from a display portion displaying the image based on input image data to a projection object through an optical system, includes: a correction portion that corrects the input image data by performing first processing of increasing pixel values of pixels of the input image data corresponding to a specific region determined by a light quantity distribution in a surface of the projection object in the image projected to the projection object, and second processing of uniformly decreasing each of pixel values of pixels of the input image data by a first pixel amount.