Projector thermal out-of-focus judgment method and projector

Abstract

The invention discloses a projector thermal out-of-focus judgment method. The method comprises the following steps: adjusting a focal length to make a projection picture clear; acquiring a clear projection picture as a first reference picture in a camera space; obtaining a pixel range value and/or a vertex coordinate value of the first reference picture as a first standard state value; triggeringphotographing regularly, and acquiring a first to-be-judged projection picture in a camera space; obtaining a pixel range value and/or a vertex coordinate value of a first to-be-judged projection picture in a camera space, and calculating the offset of the pixel range value and/or the vertex coordinate value of the first to-be-judged projection picture relative to the first standard state value, if the offset exceeds a preset value, judging that thermal defocusing occurs, and otherwise, carrying out the step of triggering photographing at regular time to obtain the first to-be-judged projection picture in a camera space. According to the invention, extra components are not needed, and the motor is not moved in the process of judging whether hot focus shifting occurs or not, so that the viewing effect is not influenced, and the user experience is high.

Description

Technical field [0001] The invention relates to the field of projection systems, in particular to a method for judging thermal run-out of a projector and a projector. Background technique [0002] Projector, also known as projector, is a device that can project images or videos onto the screen. It can be connected to computers, DVs, etc. through different interfaces to play corresponding video signals. Projectors are currently widely used in homes, offices, Schools and entertainment venues have different types of CRT, LCD, DLP, etc. according to different working methods. [0003] The phenomenon of hot out-of-focus (hot out of focus) generally occurs in projection appliances. Before the hot out-of-focus compensation, it is necessary to use some technical means to determine whether or not hot out of focus occurs. There are two main ways to judge: one way is The temperature change of the optical part of the projector is judged by thermal sensing components, and it can be intuitively...

AI Technical Summary

Problems solved by technology

[0003] The phenomenon of thermal defocusing (thermal defocusing) generally occurs in projection appliances. Before performing thermal defocusing compensation, it is necessary to use some technical means to judge whether thermal defocusing occurs. There are two main ways to judge: one way is Use thermal sensing components to judge the temperature change of the optical part of the projector, and intuitively judge whether thermal out-of-focus occurs from the cause of thermal out-of-focus, but this method will cause the optical-mechanical optical parameters of different projection equipment to change with temperature The trend is different, so it is necessary to set different thresholds to judge, the workload is heavy, it is not universal, and additional thermal sensing components need to be added, which increases the cost; another way is to judge whether the clarity of the projection screen captured by the projector camera is Changes are made to judge whether thermal out of focus occurs, but this judgment method needs to move the motor around the current position and take pictures for analysis, so as to obtain the judgment result. Since the motor will be moved during the judgment process, the projection screen will change, affecting the user's viewing

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