Image scanning method and device, and reader

The embodiment of the invention discloses an image scanning method and device, a reader and a computer readable storage medium. The method comprises acquiring the current paper feeding speed, and according to the current paper feeding speed, acquiring the control parameter of a CIS built-in light-emitting assembly corresponding to the current paper feeding speed, wherein the control parameter is aparameter obtained according to the relation between the paper feeding speed and the exposure amount in advance; according to the control parameter, performing the exposure operation on the paper inthe paper feeding channel of the reader by controlling the brightness of the CIS built-in light-emitting assembly. According to the invention, the brightness of the CIS built-in light-emitting assembly is controlled through the paper feeding speed of the reader, the exposure operation on the paper in the paper feeding channel is carried out, that is, the brightness of the CIS built-in light-emitting assembly is controlled,