Method of image correction for an eye level image projector, and apparatus for performing the method
First Claim
1. A method of image correction for an eye level image projector, comprising the steps of:
- producing a digital image in the form of a matrix, each cell of which represents a point on the image to be viewed by projection;
applying a corrective processing step which is dependent on optical and geometrical characteristics of a windshield and which produces a deformation of the projected image, such that the image multiplication effect whereby multiple projection images are produced is reduced; and
the light flux is projected on the windshield, wherein the corrective processing step comprisesproducing a corrective matrix calculated by matrix inversion of a matrix characteristic of the image multiplication effect produced by the windshield, andapplying a matrix product with the matrix to be displayed, whereby to produce the corrected matrix for projection on the windshield.
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Accused Products
Abstract
A vehicle has an eye level display for displaying information to the driver by means of images projected on to the windshield and reflected off it. The eye level display system includes means for correcting the image projected, in order substantially to eliminate multiple images. The projected image is corrected essentially by producing a corrected image, in the form of a digital matrix, before it is projected on the windshield by the projector. In one embodiment, the corrective processing step comprises inverting the matrix characteristic of the multiplication caused by the windshield. In another embodiment, it consists in producing a corrected image adaptively by minimising an error function below a predetermined threshold.
7 Citations
15 Claims
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1. A method of image correction for an eye level image projector, comprising the steps of:
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producing a digital image in the form of a matrix, each cell of which represents a point on the image to be viewed by projection; applying a corrective processing step which is dependent on optical and geometrical characteristics of a windshield and which produces a deformation of the projected image, such that the image multiplication effect whereby multiple projection images are produced is reduced; and the light flux is projected on the windshield, wherein the corrective processing step comprises producing a corrective matrix calculated by matrix inversion of a matrix characteristic of the image multiplication effect produced by the windshield, and applying a matrix product with the matrix to be displayed, whereby to produce the corrected matrix for projection on the windshield. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A vehicle comprising:
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a fascia; a windshield above the fascia; a driver'"'"'s seat; and an eve level image projector installed on the fascia, the projector comprising an image emitting surface on a liquid crystal display panel which is configured to emit light in the form of a parallel rays incident at a point of incidence on an inside face of the windshield that is visible to an observer in the driver'"'"'s seat; a processor associated with the projector and configured, as a function of geometrical and optical characteristics of the windshield, to generate a deformed image at the emitting surface to substantially eliminate a multiplication effect produced by the windshield, wherein an image reflected by the windshield to the observer (C) is represented by the following formula;
C−
p(I+Dκ
)Bwherein p represents an overall reflection coefficient applied by the windshield, I is a unity matrix, Dκ
is a matrix of vertical deviation of κ
lines associated with the multiplication effect of at least one dioptre of the windshield, the non-zero κ
Ith diagonal of which comprises an Γ
1th element corresponding to the optical characteristics of a ZCrnC of incidence on the windshield in geometrical relationship with said Γ
1th element, and B is a matrix representing the image projected by the projector.- View Dependent Claims (14, 15)
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Specification