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A filter method to offset projection distortion of building curtain wall

A projection and curtain wall technology, applied in the field of image projection processing, can solve problems such as image or video distortion, screen image distortion, unacceptable, etc., and achieve fast and effective distortion and counteract aliasing effects

Inactive Publication Date: 2016-10-19
上海佰贝网络工程技术有限公司
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AI Technical Summary

Problems solved by technology

However, when one side of the whole building is used as the projection area, the projector can only be fixed on the ground in front of the building, and because the square in front of the building is limited, the projector is generally not very far away from the building. When the height of the building is very high, the projected image or video will have a large distortion
Assume that the person watching the projected content is located at infinity; although in fact it is impossible to be infinity, but when the audience is far enough away, the effect will be closer to this infinity, and the picture seen by the audience will be distorted by the image and unacceptable

Method used

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  • A filter method to offset projection distortion of building curtain wall

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with the embodiments and with reference to the accompanying drawings.

[0031] In this embodiment, a filter algorithm for offsetting projection distortion of building curtain walls, see figure 1 , for the first and last lines of vertical resolution, there will be no projection distortion of the building curtain wall, which can be copied directly. For the image pixels on the line in between, the projection distortion of the building curtain wall will inevitably occur due to the angle of the projector, then first It should find out which projection area bisector the line is in, and then convert the image pixel data according to the color values ​​of the borders on both sides of the area, combined with the proportion of the line in the bisector line segment. This embodiment automatically calculates the anti-distortion image of the curtain wall of the building through specific parameters, finally offsets t...

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Abstract

The invention relates to a filtering method for counteracting building curtain wall projection distortion. The method comprises the steps that the distance between a projector and an intersection between the side wall of a building and the ground, the height between the height of the lowest line projected onto the side wall of the building and the ground and the height difference between the upmost line and the lowest line projected onto the side wall of the building are measured; according to the three input parameters, image frames and video frames are converted. According to the filtering method for counteracting building curtain wall projection distortion, only the limited parameters need to be obtained, and through simple operation, the building curtain wall projection distortion can be counteracted rapidly and effectively.

Description

【Technical field】 [0001] The invention relates to the field of image projection processing, in particular to a filter method for canceling projection distortion of a curtain wall of a building. 【Background technique】 [0002] Nowadays, a large number of urban landmark buildings like to use the whole building as a natural display screen at night, and then project the pictures or videos to be displayed onto the building through projection to achieve a grand and advertising display effect. This method is called "building curtain wall projection". It is not difficult to imagine that as long as the projected wall of the building is not inside the spherical surface, and the projector is not located at the "center of the sphere", the image will be deformed on the projected wall of the building due to the different projection angles. directly lead to image distortion. If it is a direct indoor projection, the usual practice is to first find a screen in the room, or a vertical surfa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/74G06T5/00
Inventor 李瑞民惠新标顾樑
Owner 上海佰贝网络工程技术有限公司
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