a test image generator configured to receive pixel data of a group of pixels comprising a channel that corresponds to a size of a plurality of row regions of a pixel array, wherein the pixel array comprises the plurality of row regions and a plurality of column regions, wherein the test image generator is configured to generate test image data based on the pixel data; and

an interface configured to transmit the test image data from the test image generator to a test device,

wherein the test image generator is configured to divide the pixel data into a first column region corresponding to a 2n-th column region of the column regions of the pixel data and a second column region corresponding to a 2n−1-th column region of the column regions of the pixel data and is further configured to generate a test image based on the first column region.