Method of Filming High Dynamic Range Videos

A method of filming a high dynamic range video, applied for an electronic product having an image sensor, and the method comprising the following steps:

• using the image sensor to capture an original image which is interlaced by a plurality of long exposure areas and a plurality of short exposure areas, and the original image comprising a plurality of pixels;
• forming the plurality of long exposure areas as a long exposure field, and forming the plurality of short exposure areas as a short exposure field;
• forming a reconstructed long exposure field and a reconstructed short exposure field having the same resolution as the original image based on a pixel value of each pixel of the long exposure field and the short exposure field via a reconstruction process;
• and
• applying the pixel value of each pixel of the reconstructed long exposure field and the reconstructed short exposure field to form a high dynamic range image via a merging process;
• wherein the pixel value is an integer within 0 to 2x−1 and x is a number of digits of the image sensor, different pixel values correspond to different levels of illuminance, and a ratio of a long exposure duration of the plurality of long exposure area to a short exposure duration of the plurality of short exposure area is a exposure duration ratio (R).