AR HUD Visibility Adjustment for Oblique Signboard Recognition
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Solution Overview
Problem
Conventional AR display apparatuses, such as on-vehicle HUD systems, face challenges in ensuring the visibility and recognition of objects and AR images by drivers, particularly when objects are far, small, or in oblique attitudes, leading to difficulties in deciphering characters on signboards.
Innovation Solution
An AR display apparatus that includes an image selection unit to identify objects, a visibility judgment unit to assess visibility based on an index value, and an AR image generator to enhance visibility through image processing, superimposing AR images onto the actual view to improve recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If an AR image is superimposed on a screen showing an actual view of an external world, then AR image information can be presented to the driver, but the driver may hardly recognize the object or the AR image visually
Solution Approach 1:
The patent applies color changes by adjusting the brightness and contrast of the AR image. When the driver's visibility of an object is judged to be low, the system increases the brightness and contrast of the corresponding AR image to enhance its visibility and make it more easily distinguishable from the background, thereby resolving the contradiction between presenting AR information and ensuring driver recognition.
Solution Approach 2:
The patent changes parameters such as brightness, contrast, and other image properties of the AR image based on the visibility judgment. By dynamically adjusting these parameters according to the object's characteristics and driving conditions, the system optimizes the AR image's visibility to ensure the driver can easily recognize both the object and the AR information presented.
2Area of stationary object
If the object is far from the vehicle, then the driver has a wider field of view, but the driver cannot visually recognize information described on the signboard
Solution Approach 1:
The patent applies dimensionality change by transitioning from a two-dimensional screen display to a three-dimensional spatial arrangement. The AR image is positioned at a location that corresponds to the actual object's position in space, allowing the driver to perceive depth and distance accurately. This spatial positioning enables the driver to recognize signboard information even when the object is far away, as the AR image maintains appropriate size and detail at the correct distance.
Solution Approach 2:
The patent creates a copy of the signboard information as an AR image that replicates the appearance and characteristics of the actual signboard. This virtual copy includes detailed text and graphical elements that can be clearly displayed and recognized by the driver, even when the physical signboard is distant and appears small in the driver's field of view.
3Shape
If the object is in an oblique attitude, then the driver can see the object, but the driver cannot easily decipher characters described on the object
Solution Approach 1:
The patent applies inversion by rotating the AR image to the correct orientation regardless of the object's actual attitude. Instead of displaying the signboard exactly as it appears in the oblique position, the system inverts the display by rotating the AR image so that the characters are always presented in the correct, readable orientation. This allows the driver to easily decipher characters on signboards that are physically tilted or angled in the real world.
Data Source
AI summary
A HUD apparatus that is an AR display apparatus mounted on an on-vehicle system includes: an image selection unit configured to input an image photographed by a camera, select and extract an area of an object from the image; a visibility judgment unit configured to judge visibility of a user with respect to the area of the object on a basis of an index value; an AR image generator unit configured to generate an AR image regarding the object by subjecting the area to image processing for improving the visibility on a basis of the visibility of the area of the object; and an AR display unit configured to superimpose and display the AR image onto a screen. The visibility judgment unit controls whether the AR image is to be displayed or not and content of the image processing to be changed in accordance with the visibility.