1. A de-interlace method, comprising: generating a characteristic difference value according to a first line-segment data and a second line-segment data; determining a blending vector based on the characteristic difference value; generating an adaptive tuning de-interlace algorithm according to the blending vector, wherein the blending vector is to determine a weight of a first de-interlace algorithm in the adaptive tuning de-interlace algorithm, and a difference between the blending vector and a constant is to determine a weight of a second de-interlace algorithm in the adaptive tuning de-interlace algorithm; and performing the adaptive tuning de-interlace algorithm to generate a de-interlaced image.