Method for storing contents of 3D image

The invention relates to a method for storing contents of a 3D image. The method comprises the steps that a processor initializes a buffer and the maximum counting, the processor utilizes a 3D comparison algorithm for generating a depth information graph corresponding to each picture of a 3D image signal, the processor obtains the depth value corresponding to each pixel of each column of pixels of the depth information graph from the depth information graphs corresponding to the pictures, the processor generates at least one depth vector corresponding to the column of pixels according to the depth value corresponding to each pixel of the column of pixels, a counter counts the number of the at least one depth vector, the processor stores the number of the at least one depth vector to the buffer, the processor compares the number of the at least one depth vector with the maximum counting, and the processor executes a corresponding motion on the buffer according to the comparison result.