1. An apparatus of image dynamic response re-mapping for receiving an original Bayer image data and performing the image dynamic response re-mapping on the original Bayer image data to generate a modulated Bayer image data, the apparatus comprising: a color coordinate transforming unit for receiving the original Bayer image data and transforming the original Bayer image data into a new transformed image data on a new image coordinate system, the image data quantity of the new transformed image data on the new image coordinate system being smaller than the data quantity of the original Bayer image data; a high gain generator for receiving the new transformed image data and calculating a maximum gain from a high gain dynamic response distribution curve according to data of a to-be-processed pixel; a low gain generator for receiving the new transformed image data and calculating a minimum gain from a low gain dynamic response distribution curve according to the data of the to-be-processed pixel; an image characteristic value generator for receiving the new transformed image data, performing an image locality analysis on an neighboring image of the to-be-processed pixel on the new image coordinate system, and calculating a characteristic value of the neighboring image, which comprises an average illumination Δy, a illumination variability δy and a histogram of illumination; a weighting calculating unit for generating a first weighting and a second weighting according to the characteristic value, wherein the first weighting is inversely proportional to the average illumination Δy, and the second weighting is directly proportional to the illumination variability δy and relates to the histogram of illumination and the data of the to-be-processed pixel; a gain modulated value calculating unit for calculating a gain modulated value according the maximum gain, the minimum gain, the first weighting and the second weighting; and an image synthesizing unit for receiving the original Bayer image data and the gain modulated value, and multiplying the original Bayer image data by the corresponding gain modulated value to generate the modulated Bayer image data.