Constant light adjusting method and system for self-defined area

Abstract

The invention provides a constant light adjusting method and system for a self-defined area. The method comprises the following steps: setting a detection area by utilizing a pixel array area of a CMOS image sensor or AE windows of an automatic exposure window; in response to closing of the automatic exposure, correcting in a darkroom by using an expected illumination value, reading and storing a preset brightness average value, an exposure time value and a gain value obtained by the CMOS image sensor under the expected illumination value, and adjusting a PWM duty ratio to control lighting equipment so as to enable the brightness average value of the detection area to be the same as the preset brightness average value; and in response to the starting of the automatic exposure, correcting in the darkroom by using the expected illumination value, reading and storing the AE target, the maximum exposure time value and the gain value, and adjusting the PWM duty ratio to control the lighting equipment so that the gain value of the detection area is the same as the stored gain value. The method and the system can provide constant light adjustment of a self-defined area, are not easily influenced by factors such as a sunlight angle, stray light, light refraction, reflection and the like, and are high in adjustment accuracy.

Description

technical field [0001] The invention belongs to the technical field of lamp lighting equipment, and in particular relates to a constant light adjustment method and system for a self-determined area. Background technique [0002] Today's indoor lighting equipment on the market, no matter how the brightness of the ambient light source changes, the brightness of the light source is still the original brightness setting. However, due to a series of factors such as the angle of sunlight, the user's visual perception will cause eye discomfort due to flickering bright and dark. At the same time, lighting equipment that emits light at full power no matter what the situation is will also cause waste of resources. Therefore, it is a current trend to design lighting equipment that can automatically adjust the illuminance according to the external ambient light source. [0003] At present, there are already many lamps with similar functions in the market. For example, some brands of ind...

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Problems solved by technology

[0004] In order to solve the problems of high cost, inconvenient installation, insufficient precision, low accuracy, easy to be affected by sunlight angle, light refraction, reflection coefficient, stray light and sensor placement in the existing indoor constant light control, this application provides an automatic A method and system for constant light adjustment in a certain area to solve the above-mentioned technical defects

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