A computer-implemented method of image splicing, the method comprising: obtaining, by one or more processors, at least two groups of to-be-spliced images and retrieving from header file information of the at least two groups of to-be-spliced images scanning information corresponding to the at least two groups of to-be-spliced images, wherein the scanning information comprises one or more pieces of information of image positions, image orientations, pixel spacing, slice thicknesses, object positions, and scanning beds corresponding to the at least two groups of to-be-spliced images; determining, by the one or more processors and according to the scanning information, space coordinate information of three-dimensional volume data of the at least two groups of to-be-spliced images, wherein the at least two groups of to-be-spliced images share a same object coordinate system; determining, by the one or more processors, an overlap area according to the space coordinate information of the three-dimensional volume data of the at least two groups of to-be-spliced images, wherein determining the overlap area comprises: comparing space coordinates of points in the three-dimensional volume data of the at least two groups of to-be-spliced images; and determining the points having the same space coordinates to be in the overlap area based on a result of the comparison; determining, by the one or more processors, a splicing sequence for the at least two groups of to-be-spliced images according to the space coordinate information of the three-dimensional volume data of the at least two groups of to-be-spliced images, wherein the splicing sequence represents a sequence into which the at least two groups of to-be-spliced images are to be spliced; registering, by the one or more processors, the at least two groups of to-be-spliced images based on the overlap area to obtain a registration result; and splicing, by the one or more processors, the at least two groups of registered to-be-spliced images according to the splicing sequence and the registration result; characterized in that, registering the at least two groups of to-be-spliced images based on the overlap area comprises: determining a size of an extension range according to a size of an image processing operator, wherein the image processing operator comprises one of Roberts operator, Sobel operator, Prewitt operator, Laplacian operator and Gaussian-Laplacian operator; extending the overlap area according to the size of the extension range to obtain the to-be-registered area; and registering the at least two groups of to-be-spliced images based on the to-be-registered area. obtaining, by one or more processors, at least two groups of to-be-spliced images and retrieving from header file information of the at least two groups of to-be-spliced images scanning information corresponding to the at least two groups of to-be-spliced images, wherein the scanning information comprises one or more pieces of information of image positions, image orientations, pixel spacing, slice thicknesses, object positions, and scanning beds corresponding to the at least two groups of to-be-spliced images; determining, by the one or more processors and according to the scanning information, space coordinate information of three-dimensional volume data of the at least two groups of to-be-spliced images, wherein the at least two groups of to-be-spliced images share a same object coordinate system; determining, by the one or more processors, an overlap area according to the space coordinate information of the three-dimensional volume data of the at least two groups of to-be-spliced images, wherein determining the overlap area comprises: comparing space coordinates of points in the three-dimensional volume data of the at least two groups of to-be-spliced images; and determining the points having the same space coordinates to be in the overlap area based on a result of the comparison; determining, by the one or more processors, a splicing sequence for the at least two groups of to-be-spliced images according to the space coordinate information of the three-dimensional volume data of the at least two groups of to-be-spliced images, wherein the splicing sequence represents a sequence into which the at least two groups of to-be-spliced images are to be spliced; registering, by the one or more processors, the at least two groups of to-be-spliced images based on the overlap area to obtain a registration result; and splicing, by the one or more processors, the at least two groups of registered to-be-spliced images according to the splicing sequence and the registration result; characterized in that, registering the at least two groups of to-be-spliced images based on the overlap area comprises: determining a size of an extension range according to a size of an image processing operator, wherein the image processing operator comprises one of Roberts operator, Sobel operator, Prewitt operator, Laplacian operator and Gaussian-Laplacian operator; extending the overlap area according to the size of the extension range to obtain the to-be-registered area; and registering the at least two groups of to-be-spliced images based on the to-be-registered area. determining a size of an extension range according to a size of an image processing operator, wherein the image processing operator comprises one of Roberts operator, Sobel operator, Prewitt operator, Laplacian operator and Gaussian-Laplacian operator; extending the overlap area according to the size of the extension range to obtain the to-be-registered area; and registering the at least two groups of to-be-spliced images based on the to-be-registered area.