We propose a method for increasing the viewing angle during the computational reconstruction of integral imaging to solve the problem of narrow viewing angle during integral imaging. Initially, the adjacent elemental image units are aligned and stitched for enlarging the elemental image region corresponding to each microlens based on the integral imaging principle and similarity of the adjacent elemental images. When compared with the traditional method, the proposed method can accurately integrate elemental images by using the corresponding microlens when the viewing direction considerably deviates from the optical axis and exceeds a certain range of traditional perspective. However, because of the addition of image registration and stitching of adjacent elemental images during computational reconstruction, the calculation time increases.