Camera with dust checking function

1. A camera, comprising: a photo-sensitive element is configured to capture an image of an object; a controller is electrically connected to the photo-sensitive element and is configured to convert a color level value of each of a plurality of pixels of the image into an image gray level value, wherein when one of the image gray level values is higher than a predetermined gray level threshold value, the controller is configured to generate an alarm message to display on a screen of the camera; and an input/output interface is electrically connected to the controller, wherein the input/output interface is configured to adjust the predetermined gray level threshold value, and wherein the input/output interface is further configured to set an aperture value and adjust the predetermined gray level threshold value according to the aperture value.

2. The camera of claim 1 , wherein the controller is further configured to detect a position of one of the pixels in which the image gray level thereof is greater than the predetermined gray level threshold value, and display information of the position on the screen of the camera.

3. The camera of claim 1 , further comprising: a distance measuring module is electrically connected to the controller and is configured to measure a distance between the object and the camera, wherein the controller is configured to control an optical lens to perform a focusing process according to the distance.

4. A camera, comprising: a photo-sensitive element is configured to capture an image of an object; a controller is electrically connected to the photo-sensitive element and is configured to acquire a green level value of each of a plurality of pixels of the image, wherein when one of the green level values is higher than a predetermined green level threshold value, the controller is configured to generate an alarm message to display on a screen of the camera; and an input/output interface is electrically connected to the controller, wherein the input/output interface is configured to adjust the predetermined green level threshold value, and the input/output interface is further configured to set an aperture value and adjust the predetermined green level threshold value according to the aperture value.

5. The camera of claim 4 , wherein the controller is further configured to detect a position of one of the pixels in which the green level value thereof is greater than the predetermined green level threshold value, and display information of the position on the screen of the camera.

6. The camera of claim 4 , wherein the controller is further configured to obtain a red level value, the green level value, and a blue level value of each of the pixels of the image, wherein when one of the red, green, and blue level values is greater than a corresponding predetermined red level threshold value, the corresponding predetermined green level threshold value, or a corresponding predetermined blue level threshold value, the controller is configured to generate an alarm message to display on the screen of the camera.

7. The camera of claim 4 , further comprising: a distance measuring module is electrically connected to the controller and is configured to measure a distance between the object and the camera, wherein the controller is configured to control an optical lens to perform a focusing process according to the distance.