Distance measurement system applicable to different reflecting surfaces and computer system

A computer system, coupled to an electronic device, the computer system comprising:

• a communication interface configured to successively receive, from the electronic device, image frames each containing an object image of an object, the object image having an average brightness value converged within a predetermined range;
• and
• a central processing unit configured to
• respectively calculate an object size of the object image with the converged brightness value in each of a plurality of image frames received at different times at first and then calculate an average value of the calculated object sizes, and
• compare the average value with a lookup table, which is previously stored in a memory, to determine an object distance of the object.

A distance measurement system, comprising:

• an electronic device configured to successively output image frames each containing an object image of an object, the object image having an average brightness value converged within a predetermined range;
• and
• a computer system configured to
• successively receive the image frames from the electronic device,
• calculate a plurality of first object sizes of the object image with the converged brightness value in a same received image frame at first and then calculate a first average value of the calculated first object sizes,
• calculate a second average value of the calculated first average values corresponding to a plurality of image frames received at different times and containing the object image with the converged brightness value, and
• compare the second average value with a lookup table, which is previously stored in a memory, to determine an object depth of the object.