Projection Image Correction Using Surrounding Brightness Context
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Solution Overview
Problem
Conventional projection image correction methods fail to fully compensate for the difference in appearance due to brightness variations between the projection portion and its surroundings, impairing the realistic feeling of colors and texture.
Innovation Solution
An image correction device that estimates a projection result image, calculates perceptual differences, and updates the projection image to minimize these differences based on human visual characteristics, using a camera and projector setup where the imaging area is larger than the projection area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional projection image compensation is performed only on the basis of the projection image, then the image degradation due to ambient light, reflectance change, and dynamic range can be cancelled, but the difference of appearance due to comparison with the brightness around the projection portion cannot be fully compensated
Solution Approach 1:
The patent extends the compensation scope from the projection portion only to include the surrounding area. By capturing an imaging portion that is larger than the projection portion and includes the projection portion, the system adds spatial dimension to the compensation process. This allows the perception distance calculation to consider brightness differences between the projection portion and its surroundings, thereby preserving the realistic feeling of colors and texture while maintaining image compensation accuracy.
2Illumination intensity
If the projector displays an image by adding light to a real object, then the projection can be clearly visible, but the projection portion becomes clearly brighter than surroundings which impairs the reality of colors and texture
Solution Approach 1:
The patent changes the parameter scope from only the projection portion to include both the projection portion and the surrounding area. By calculating the perception distance based on images having a size identical to the imaging portion (which includes both projection and surrounding areas), the system adjusts the brightness parameter in context of the surrounding environment. This allows the projection to remain clearly visible while compensating for the unrealistic brightness difference, thereby preserving the realistic feeling of colors and texture.
3Device complexity
If the imaging portion is set identical to the projection portion, then the processing is simplified, but the brightness difference between projection portion and surroundings cannot be compensated
Solution Approach 1:
The patent increases the imaging portion size beyond the projection portion boundaries. This dimensional expansion allows the system to capture surrounding brightness information without significantly increasing processing complexity. The perception distance calculation unit then utilizes this expanded imaging data to compensate for brightness differences, achieving realistic color and texture preservation while maintaining reasonable processing complexity through efficient use of the extended imaging data.
Data Source
AI summary
Provided is an image correction device and the like, which allow improvement of realistic feeling of colors and texture of a projection portion by correcting a projection image in consideration of brightness of the projection portion with respect to surroundings. Where a projection portion is a range in which a projector projects an image on a projection target, an imaging portion is a range captured by a camera, the imaging portion is larger than the projection portion, and the imaging portion includes the projection portion, the image correction device includes: a projection result estimation unit configured to estimate an image obtained when a projection image is projected onto a projection target, and to obtain a projection result estimation image; a perception distance calculation unit configured to calculate a perception distance that is a perceptual difference in brain representation between a target image and the projection result estimation image; and a projection image update unit configured to update the projection image so as to reduce the perception distance, and to obtain an updated projection image, wherein the projection result estimation image and the target image are images having a size identical to the imaging portion.