3results about How to "Stable brightness" patented technology

The invention discloses a control method and device for a color temperature breathing light supplement lamp, and belongs to the technical field of illumination control. The method comprises the steps that a color temperature control curve is generated according to a preset periodic function, the color temperature control curve represents the change relation of the color temperature proportion along with time, and the color temperature proportion is the proportion of the cold light quantity in the total light quantity; periodically updating a color temperature proportion value corresponding to the current moment according to the color temperature control curve; respectively calculating driving parameters of the cold light emitting unit and the warm light emitting unit according to the color temperature proportion value; and controlling the output of the cold light emitting unit and the warm light emitting unit according to the driving parameters, so that the output color temperature of the light supplementing lamp is periodically and cyclically changed within a preset color temperature range. Breathing control and color temperature control are combined, alternate, continuous and cyclic change of color temperature is achieved, and the playing method of the light supplementing lamp is enriched.

This invention provides a data preprocessing method to ensure balanced brightness in tone-mapped output images. The method combines the characteristics of HDR synthesis with the relationship between exposure ratio and theoretical maximum value of the synthesized HDR image as a reference for preprocessing operations. This allows tone mapping to adapt to various complex environments and maintain stable output brightness, enhancing the adaptability and robustness of the tone mapping process.

The utility model discloses a kind of low temperature drift's multi-channel LED constant current drive circuit with temperature compensation function, including voltage input end, LED load, constant current drive circuit and temperature compensation circuit, temperature compensation circuit is provided with NTC thermistor R9 and triode Q8, utilize common constant current drive circuit to realize the constant current drive to LED load, make the luminous intensity of LED stable, LED's luminous intensity will not appear with the fluctuation of input voltage and increase or reduce, and add temperature compensation circuit, cooperate constant current drive circuit, not only can be realized when the use environment temperature changes, the current size of LED is always unchanged, almost no temperature drift, the brightness of LED becomes extremely stable, moreover, the current value precision of lighting to stable state is extremely high, basically no error, by setting the maximum current value required under high temperature and the parameter of each component of temperature compensation circuit, the brightness when LED just lights up can also be accurately set, to realize current compensation function.