A description hereinafter exemplary embodiments will be described in detail with reference to the accompanying drawings throughout the drawings and the detailed description unless otherwise described the same drawing reference numerals will be understood to refer to the same elements features and structures the relative size and depiction of these elements may be exaggerated for clarity illustration and convenience the following detailed description is provided to assist the reader in gaining a comprehensive understanding of the methods apparatuses and or systems described herein accordingly various changes modifications and equivalents of the methods apparatuses and or systems described herein will be suggested to those of ordinary skill in the art also descriptions of well known functions and constructions may be omitted for increased clarity and conciseness a method for bus data compression according to an embodiment will be described with reference to fig2 fig2 is a diagram illustrating an exemplary transmission of the compressed bus data according to an embodiment here u2018 b u2019 described in fig2 represents a full byte 1 byte 8 bits data u2018 h u2019 represents a half byte 4 bits which lacks upper 4 bits nine bus cycles c 1 to c 9 are described in fig2 2 byte bus data is transmitted into a slave device in a cycle generally image data are transmitted by 1 byte unit adjacent continuous in terms of time image data mostly have upper 4 bits accordingly the data array pattern of each image data is described in two forms of u2018 b u2019 and u2018 h u2019 in this embodiment meantime alphabet capital letter u2018 c u2019 described in.