Camera system and image processing method thereof

An image processing method adapted to a camera system, comprising:

• performing pre-processes, consisting essentially of:
• generating a raw image by a plurality of pixels of an image sensor in a camera of the camera system;
• converting a raw gray level value corresponding to each of the plurality of pixels in the raw image into a target gray level value, wherein the target gray level value is zero when the raw gray level value is less than or equal to a black level value;
• converting the raw image with the target gray level value into a format of RGB data;
• and
• converting the format of RGB data into a format of YUV data.

A camera system, comprising:

• a camera, comprising:
• an image sensor, comprising:
• a plurality of pixels;
• and
• a tone mapping circuit configured to convert a raw gray level value corresponding to each of the plurality of pixels in a raw image into a target gray level value, wherein the target gray level value is zero when the raw gray level value is less than or equal to a black level value;
• and
• an image pre-processor electrically connected to the image sensor, wherein the image pre-processor consisting essentially of:
• a demosaic circuit configured to convert the raw image with the target gray level value into a format of RGB data;
• and
• a color space conversion circuit configured to convert the format of RGB data into a format of YUV data.