An image coding method and apparatus considering human visual characteristics are provided. The process comprises controlling a growth velocity, v, an average axial temperature gradient, G0, and a cooling rate of the crystal from solidification to about 750\xb0 C. A method and computer program product for detecting a position of a component in an earth formation is also disclosed. Accordingly, an avatar image received by a called party can be respectively controlled. The image sensor module receives a substantially parallel third portion of the patterned light beam, and comprises a third image sensor and a collimator.