Referring to FIG. 3B, the image capturing apparatus 100 may identify the magnitudes of one or more frequency components configuring the image, that is, the image block 311, on a 2D space defined in a first direction and a second direction. Also, the image capturing apparatus 100 may arrange the identified magnitudes of the one or more frequency components on a 2D plane, as shown in FIG. 3B.

Here, a magnitude 321 at an upper left end of the arrangement may denote a magnitude of a component having the frequency of 0 (that is, the magnitude of a DC component), from among one or more frequency components configuring the image block 311. Also, the first direction and the second direction may be perpendicular to each other. For example, the first direction may be an X direction on an X-Y plane and the second direction may be a Y direction.

The image capturing apparatus 100 according to the embodiment may determine a frequency filter to correspond to a difference between a current bitrate of the image and the target bitrate (S62). Here, the current bitrate of the image may denote bitrate of the image, to which the frequency filter is not applied. Also, the target bitrate may denote a bitrate that an output image from the image capturing apparatus 100 has to satisfy, according to requirements of the system (see FIG. 1) and/or the network (see FIG. 1) according to the embodiment, and may have a value that is generally less than the current bitrate.