Abstract: Provided are a camera, a method, apparatus and device for switching between a day mode and a night mode, and a medium. The method includes steps described below. In response to a current camera mode being the night mode, a color temperature value of a current imaging picture is determined. Visible light illuminance of the current imaging picture is determined by utilizing the color temperature value and an infrared light contribution ratio of picture brightness obtained based on white balance statistical information of the current imaging picture and used as first visible light illuminance. It is determined whether to switch from the current night mode to the day mode by utilizing a magnitude relationship between the first visible light illuminance and a first preset illuminance threshold.

Abstract: Provided are a camera, a method, apparatus and device for switching between a day mode and a night mode, and a medium. The method includes steps described below. In response to a current camera mode being the night mode, a color temperature value of a current imaging picture is determined. Visible light illuminance of the current imaging picture is determined by utilizing the color temperature value and an infrared light contribution ratio of picture brightness obtained based on white balance statistical information of the current imaging picture and used as first visible light illuminance. It is determined whether to switch from the current night mode to the day mode by utilizing a magnitude relationship between the first visible light illuminance and a first preset illuminance threshold.

Abstract: A focusing method is disclosed, comprising: recording image statistical information corresponding to each position of a focusing lens from the beginning of focusing, wherein the image statistical information comprises a luminance value of image; determining whether the current scene is a point light source scene or not based on the recorded image statistical information; and executing a focusing process based on a regional luminance variance of image when the current scene is determined as a point light source scene. Wherein, the regional luminance variance of image denotes a mean of the square of differences between luminance values of a plurality of regions partitioned from an image and an average luminance value of the image. The method of the present disclosure can effectively improve the stability and accuracy of focusing effect under a point light source scene.

Abstract: A focusing method is disclosed, comprising: recording image statistical information corresponding to each position of a focusing lens from the beginning of focusing, wherein the image statistical information comprises a luminance value of image; determining whether the current scene is a point light source scene or not based on the recorded image statistical information; and executing a focusing process based on a regional luminance variance of image when the current scene is determined as a point light source scene. Wherein, the regional luminance variance of image denotes a mean of the square of differences between luminance values of a plurality of regions partitioned from an image and an average luminance value of the image. The method of the present disclosure can effectively improve the stability and accuracy of focusing effect under a point light source scene.