To generate digital holograms with a large viewing angle, a digital holographic technique based on filter imaging is proposed. Using the off-axis image plane holography, a low-pass filter is placed at the spatial frequency plane of the 4F coherent imaging system, in order to make the object wave (satisfied CCD resolution ratio) interfere with the reference wave, and the loss-pass filter and imaging areas are controlled to record the sub-holograms for different spectra in turn. In digital holographic reconstruction, all sub-holograms are carried on numerical Fourier transform, and the corresponding spectra are reconstructed which are also stitched to form a whole spectrum of object wave. Then, a large viewing angle reconstruction image can be obtained by digital holography. The proposed technique is applied to the three-dimensional profile measurement of a sewing needle, and the experimental results prove the accuracy of this technique.