When point spread function(PSF)is not known or only partially determined

restoration of the degraded images is called blind image restoration (BIR). In recent years

BIR algorithms (BIRA) have been studied widely. In this paper

BIRA is classified into three kinds: single channel BIRA with space-invariant PSF

multi-channel BIRA with space-invariant PSF and BIRA with space-variant PSF

according to the characteristic of PSF. The actual research status of BIRA is discussed in detail. Here

advantages and disadvantages of BIRA are also pointed out. After researching on the techniques

some results and conclusions are given as follow: improvement for the existing BIR methods

development a new techniques

the research based on degradation model with non-linear characteristic

the removal noise

the real time algorithm and their applications are the challenges and further research tendency.