Abstract: A fog discrimination method is disclosed, including a capturing step, a calculation step, and a determining step. The capturing step includes capturing a sub-image of an image. The sub-image includes a light shield body image and a light shield stripe image. The calculation step includes calculating a maximum average grayscale value and a minimum average grayscale value of the sub-image; and calculating a fog function. The fog function is a function of the maximum average grayscale value and the minimum average grayscale value. The determining step includes determining whether the fog function is greater than or less than a threshold; and determining as being fogged when the fog function is less than the threshold.

Abstract: An oral cavity scanning device is provided in the invention. The oral cavity scanning device includes an image capturing unit, an IMU circuit and a processing unit. The image capturing unit obtains a first image and a second image. The IMU circuit obtains IMU information corresponding to the first image and the second image. The processing unit obtains a distance value between the first image and the second image. The processing unit uses a contour algorithm to obtain a first contour and a second contour. The processing unit obtains first sampling points according to the first contour and second sampling points according to the second contour. The processing unit uses a feature algorithm to find relative feature points between the first sampling points and the second sampling points. The processing unit uses a depth information algorithm to obtain the depth information of each feature point.

Abstract: A message passing method for computer system is proposed. The computer system comprises a common device driver unit and at least one application module unit communicated to the common device driver unit through a message exchange unit. The message exchange unit is composed of a plurality of message buffers in a plurality of tasks. Each task has an independent message buffer pointed to another task and each independent message buffer is connected to two specific tasks only. The message passed in this computer system has a lead-code, a sub-code and an extend data. The lead-code comprises a command trigger sign and a ready sign.

Abstract: A computer system with parallel sever architecture comprises a common device driver unit for managing the I/O interface of at least one common device of the computer system; at least one application module unit runnable on the computer system and comprising hardware and software to perform certain function with the help of the common device in the common device driver unit; and a message exchange unit functioned as message interface of the common device driver unit and the application module unit. The common device driver unit is in same hierarchy as the application module unit. The communication between the common device driver unit and the application module unit is controlled by the message exchange unit rather than direct connection.