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A kind of laser projector and projection method thereof

A laser projector and projection technology, which is applied in the field of laser projection, can solve problems such as projection blur and laser spot spread, and achieve the effect of eliminating the influence of laser spot spread

Active Publication Date: 2019-11-08
GOERTEK OPTICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the problem of projection blur caused by laser spot diffusion in the prior art laser projection process, a laser projector and its projection method of the present invention are proposed in order to overcome the above problems or at least partially solve the above problems

Method used

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  • A kind of laser projector and projection method thereof
  • A kind of laser projector and projection method thereof
  • A kind of laser projector and projection method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] figure 1 A schematic flowchart of a projection method for a laser projector provided by an embodiment of the present invention, as shown in figure 1 As shown, the projection method of the laser projector includes:

[0045] Step 1: S110, acquiring the point spread function H of the laser projector.

[0046] Point spread function (point spread function), for an optical system, when the input object is a point light source, the light field distribution of the output image is called the point spread function. For a laser projector, the brightness distribution of the laser spot emitted by the laser is its point spread function. Obtaining the point spread function H also obtains the diffusion of the laser spot projected by the laser projector.

[0047] Step 2: S120, according to the target projection image B and the point spread function H, use the formula:

[0048] A=F -1 (F(B) / F(h)),

[0049] Calculate and obtain the image A actually used for projection, where F repres...

Embodiment 2

[0073] The invention also discloses a laser projector, figure 2 A structural schematic diagram of an embodiment of the laser projector is shown, as figure 2 As shown, the laser projector includes: a point spread function acquisition unit 210 , an actual projected image calculation unit 220 and a projection unit 230 .

[0074] The point spread function acquiring unit 210 is configured to acquire the point spread function H of the laser projector.

[0075] The actual projection image calculation unit 220 is used to use the formula according to the target projection image B and the point spread function H:

[0076] A=F -1 (F(B) / F(H)),

[0077] Calculate and obtain the image A actually used for projection, and send it to the projection unit 230, wherein, F represents Fourier transform, and F -1 Represents the inverse of the Fourier transform.

[0078] The projection unit 230 is configured to receive and project the obtained image A actually used for projection.

[0079] Pr...

Embodiment 3

[0085] image 3 shows a schematic structural view of another embodiment of the laser projector of the present invention, and figure 2 Unlike the illustrated embodiment, the laser projector further includes a storage unit 240 .

[0086] The storage unit 240 is configured to store the point spread function H obtained by the point spread function obtaining unit 210 . Furthermore, the actual projection image calculation unit 240 is further used to call the point spread function H in the storage unit 240 before each projection, and calculate the image A actually used for projection in combination with the target projection image B, and send it to the projection unit 230 .

[0087] The beneficial effects of the laser projector shown in Embodiment 2 and Embodiment 3 of the present invention are the same as those of the projection method shown in Embodiment 1, and will not be repeated here.

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Abstract

The invention discloses a laser projector and a projection method thereof. The method comprises that a point diffusion function H of the laser projector is obtained; according to a target projection image B and the point diffusion function H, an image A for projection practically is calculated and obtained; and the image A for projection practically is used to implement projection. The point diffusion function H of the laser projector is obtained before projection, the image A for projection practically is calculated according to the point diffusion function H and the image A for projection practically, and the image A is used to implement projection; and thus, the problem of a fuzzy projection image caused by diffusion of laser spots in the projection process can be eliminated, the projection quality is improved, and a projection image as clear as the target projection image is obtained.

Description

technical field [0001] The invention relates to the technical field of laser projection, in particular to a laser projector and a projection method thereof. Background technique [0002] The laser projector is a device that uses laser light as the projection light source, collimates the projection light source in parallel, and deflects the laser projection angle by using a deflection mirror. It can scan and project images at different distances, and has broad application prospects. [0003] However, in the current laser projection technology, the laser spot projected by the laser projector is used as a pixel point for projection, but in the actual projection process, due to internal optical devices such as dichroic prisms, speckle reduction devices The projected laser spot will be diffused due to the impact of the projected laser spot, which will cause the projected laser spot to be larger than the actual required pixels, which will cause blurred projection. Contents of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03B21/14G02B27/48
CPCG02B27/48G03B21/142
Inventor 杨乐宝鲁公涛刘德安
Owner GOERTEK OPTICAL TECH CO LTD
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