Image depth determining method and living body identification method, circuit, device, and medium

A chip circuit, comprising:

• circuit units configured to perform operations comprising:
• obtaining pixel coordinates of a feature point pair associated with an object point on a subject, wherein the feature point pair comprises a first pixel in a first image corresponding to the object point and a second pixel in a second image corresponding to the object point, wherein the first image is an image captured by a first camera for the subject, and the second image is an image captured by a second camera for the subject, and wherein the pixel coordinates comprise first pixel coordinates of the first pixel in the first image and second pixel coordinates of the second pixel in the second image;
• determining a first straight line passing through the origin of a first camera coordinate system of the first camera based on the first pixel coordinates and intrinsic parameters of the first camera, wherein a first coordinate representation of the object point in the first camera coordinate system is located on the first straight line;
• determining a second straight line passing through the origin of a second camera coordinate system of the second camera based on the second pixel coordinates and intrinsic parameters of the second camera, wherein a second coordinate representation of the object point in the second camera coordinate system is located on the second straight line;
• and
• determining the depth of the object point based on the first straight line, the second straight line, and extrinsic parameters describing a relative position relationship between the first camera and the second camera.

A computing device, comprising:

• one or more processors;
• and
• a memory, which stores a program comprising instructions that, when executed by the one or more processors, cause the one or more processors to perform operations comprising:
• obtaining pixel coordinates of a feature point pair associated with an object point on a subject, wherein the feature point pair comprises a first pixel in a first image corresponding to the object point and a second pixel in a second image corresponding to the object point, wherein the first image is an image captured by a first camera for the subject, and the second image is an image captured by a second camera for the subject, and wherein the pixel coordinates comprise first pixel coordinates of the first pixel in the first image and second pixel coordinates of the second pixel in the second image;
• determining a first straight line passing through the origin of a first camera coordinate system of the first camera based on the first pixel coordinates and intrinsic parameters of the first camera, wherein a first coordinate representation of the object point in the first camera coordinate system is located on the first straight line;
• determining a second straight line passing through the origin of a second camera coordinate system of the second camera based on the second pixel coordinates and intrinsic parameters of the second camera, wherein a second coordinate representation of the object point in the second camera coordinate system is located on the second straight line;
• and
• determining the depth of the object point based on the first straight line, the second straight line, and extrinsic parameters describing a relative position relationship between the first camera and the second camera.