Projector Drawing Area Detection Using Luminance Contrast
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Solution Overview
Problem
Existing projector technologies face difficulties in detecting a drawing area when the background is transparentized, making it challenging to accurately determine the position of a pointer on the projection surface, which can lead to difficulties in user interaction.
Innovation Solution
A method and system where a projector projects an achromatic area image representing the drawing area at a reduced luminance, detects the pointer's position, and displays the outline of the drawing area at a higher luminance when the pointer is within the drawing area, allowing for accurate detection and enhanced user interaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the background is transparentized in the projected image, then the visibility of background content is improved, but the ability to detect the drawing area and pointer position deteriorates
Solution Approach 1:
The projected image is segmented into multiple layers: a background image layer and a foreground drawing area layer. The background can be transparentized for visibility while the drawing area is outlined with a detection frame that remains visible for pointer detection. This segmentation allows simultaneous achievement of background visibility and drawing area detectability.
Solution Approach 2:
A detection frame (outline) is introduced as an intermediary element between the transparentized background and the pointer detection system. This frame serves as a visible reference that enables the detection device to identify the drawing area boundaries and pointer position even when the background is transparentized.
2Illumination intensity
If the luminance of the drawing area is reduced, then the visibility of the projected content is improved, but the detectability of the pointer position deteriorates
Solution Approach 1:
Different luminance levels are applied to different parts of the projected image. The drawing area is outlined with a detection frame that has higher luminance than the surrounding content, creating local contrast that enhances pointer detectability while maintaining overall content visibility at reduced luminance.
Solution Approach 2:
The detection frame is displayed with a luminance level that differs from the surrounding projected content. This luminance contrast (analogous to color change) makes the detection frame visually distinct and easier for the detection device to identify, thereby improving pointer position detectability without compromising overall content visibility.
3Measurement precision
If the outline of the drawing area is displayed at high luminance, then the detectability of the drawing area is improved, but the overall visibility of the projected content deteriorates
Solution Approach 1:
High luminance is applied locally only to the detection frame outlining the drawing area, while the rest of the projected content maintains a lower, comfortable luminance level. This localized high luminance improves drawing area detectability without causing overall visibility deterioration.
Solution Approach 2:
The detection frame is displayed with excessively high luminance compared to the surrounding content, but this excessive action is limited to only the necessary outline portions. This partial application of high luminance achieves sufficient detectability while minimizing the negative impact on overall content visibility.
Data Source
AI summary
A method of controlling a projector includes projecting an achromatic area image representing a drawing area in which the projector receives drawing using a pointer on a projection surface at a first luminance at a ratio on the projection surface, the ratio being smaller than or equal to a specific ratio to a maximum luminance at which the projector capable of project an image on the projection surface, detecting a position on the projection surface pointed by the pointer while projecting the area image, determining whether or not the position is included in the drawing area, and displaying, by the projector, an area including at least a part of an outline of the drawing area at a luminance higher than the first luminance when it is determined that the position is included in the drawing area.