Image sensor, mobile terminal, and image photographing method

An image sensor, comprising:

• a pixel array, wherein the pixel array comprises a preset quantity of pixel units arranged in a preset manner, the pixel unit comprises a first pixel and a second pixel whose location is adjacent to that of the first pixel, the first pixel is composed of at least one red sub-pixel, at least one green sub-pixel, and at least one blue sub-pixel, and the second pixel comprises at least one of a red sub-pixel or a blue sub-pixel, a green sub-pixel, and an infrared sub-pixel, wherein the first pixel and the second pixel are both full-pixel dual-core focus pixels, and the first pixel and the second pixel each are composed of four full-pixel dual-core focus sub-pixels;
• and
• a location of the infrared sub-pixel in the second pixel is the same as that of the red sub-pixel, the green sub-pixel, the blue sub-pixel, a first combined sub-pixel, or a second combined sub-pixel in the first pixel, wherein the first combined sub-pixel is a combination of a ½ red sub-pixel and a ½ green sub-pixel whose locations are adjacent, and the second combined sub-pixel is a combination of a ½ green sub-pixel and a ½ blue sub-pixel whose locations are adjacent;
• or
• a location of a ½ infrared sub-pixel in the second pixel is the same as that of a ½ red sub-pixel, a ½ green sub-pixel, or a ½ blue sub-pixel in the first pixel, and ½ infrared sub-pixels in two adjacent second pixels are combined to form the complete infrared sub-pixel.