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Application method of index form brightness transition in projector image splicing and fusing

An exponential form, image stitching technology, applied in optics, instruments, projection devices, etc., can solve the problems of increased computational load, poor fitting effect, easy to produce fine stripes, etc., to achieve the effect of convenient adjustment

Inactive Publication Date: 2009-06-10
SHANGHAI FOREMOST MULTIMEDIA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of the polynomial curve brightness transition technique are:
[0005] 1. There are too many control points (generally more than 4), and it is inconvenient to adjust;
[0006] 2. If the number of times is too low, the fitting effect will not be good, and thin stripes will easily appear. If the number of times is too high, the amount of calculation will increase, further increasing the difficulty of adjustment

Method used

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Examples

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Embodiment Construction

[0019] The application of exponential brightness transition in the splicing and fusion of projectors includes: using the projector for large-screen fusion splicing display, the images projected by the two projectors have overlapping parts, and the images of the overlapping parts are completely consistent, and the overlapping parts of the images use brightness gradient blending transition; its brightness gradually darkens with the overlapping direction, and the brightness change function adopts the following exponential function:

[0020] 1-(w u -1) / (w-1)

[0021] in:

[0022] u represents the transition area, from 0-1;

[0023] w represents the degree of curvature of the transition curve (not 1).

[0024] According to the exponential mode of the human eye's response to the brightness, this solution adopts an exponential curve in the brightness transition. Contains the following:

[0025] 1. Use one control parameter to control the brightness at the end of the brightness c...

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Abstract

The present invention relates to a method for applying exponential form brightness transition in image splicing syncretizing of projector. The method comprises the following steps: overlapping the same parts; gradually transiting the brightness of same parts; and completing the syncretizing splicing. Compared with the prior art, the method of the invention has the advantages that the method is more satisfied for the visual effect of human eye and hardly strip effect exists in brightness transition; and adjustment is more convenient as only two parameters exist.

Description

technical field [0001] The invention relates to projector image splicing and fusion technology, in particular to an application method of exponential brightness transition in projector image splicing and fusion. Background technique [0002] Projector splicing and fusion are often used in multimedia presentations to achieve large-screen projection effects. The key to stitching is the brightness transition of overlapping images. The brightness transition method is one of the widely used methods at present, and the practical transition calculation method is to use a linear transition or a polynomial curve transition. [0003] Since the human eye's response to brightness is in a logarithmic mode, linear transitions will inevitably produce stripe effects. Modern splicing and fusion have abandoned the brightness linear transition technology. [0004] Polynomial curve transition is widely used when adding enough control points and increasing times, and can more accurately fit va...

Claims

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Application Information

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IPC IPC(8): G03B21/00H04N9/64
Inventor 胡学增
Owner SHANGHAI FOREMOST MULTIMEDIA
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