Remote sensing image automatic cloud detection method and device

The invention discloses a remote sensing image automatic cloud detection method and device, and belongs to the technical field of satellite remote sensing. The method comprises the following steps: carrying out effectiveness judgment of pixel points, and primarily locking a cloud detection area; then, partitioning a remote sensing image, and respectively determining a detection threshold value of each wave band by utilizing mean values and variances of effective pixels in the image blocks in a near-infrared wave band, a short-wave infrared wave band and a thermal infrared wave band; and finally, performing preliminary cloud detection by using the detection threshold of the near-infrared band, removing a white object by using the detection threshold of the short-wave infrared band, and removing a false alarm by using the detection threshold of the thermal infrared band. According to the method, any parameter and labeled sample do not need to be manually set, the physical characteristic threshold is automatical