Methods for matching dynamic range of image signals

The invention provides methods for matching the dynamic range of image signals, in particular relates to methods for processing the image signals, aims at solving the problem of influenced image quality of the prior art, which is caused by the reason that the dynamic range of a digital image in a computer can not be well matched with the dynamic range of digital output equipment. The invention mainly adopts two methods: in the first method, the brightness signal of the image signal is extracted and then is processed by the steps of blurring, adjustment, stretching transformation, and the like, and detail signals in the brightness signal are correspondingly processed, so that the dynamic range of the digital image can be matched with the dynamic range of digital equipment; or in the secondmethod, the brightness signal of the image signal is extracted and is divided into regional blocks; after being initially adjusted, the brightness signal of pixel in each regional block is processed by the operation of weighted average, so that the dynamic range of the digital image can be matched with the dynamic range of digital equipment. The methods can be used for processing the digital image so as to output high quality images.