1. An image noise filtering method comprising: obtaining a temporal weight based on an adaptive noise deviation value obtained with respect to a temporal difference between a current pixel and a previous pixel; refining the obtained temporal weight based on a peripheral pixel of the current pixel and other channel pixels; and performing temporal filtering on the current pixel based on the refined temporal weight, wherein an output value of the temporal filtering is blended with an output value of spatial filtering, to obtain a result of spatio-temporal filtering as a sum of the output value of the temporal filtering and a weighted difference between the output value of the spatial filtering and the output value of the temporal filtering, and the output value of the spatial filtering is obtained by blending a value of the current pixel and a mean value of peripheral pixels in a spatial domain using the temporal weight.