Abstract: A DCT-based technique with rhombus scanning for image compression. A flipped-kernel discrete cosine transform is applied to an eight by eight pixel sub-block of the sixteen by sixteen pixel block. A visually insignificant information is removed from the eight by eight pixel sub-block. A quantization method is used to remove the visually insignificant information. A quantized discrete cosine transform coefficient is scanned of the sixteen by sixteen pixel block. The quantized discrete cosine transform coefficient is scanned according to a rhomboid pattern. A portion of a digital image may be divided into a sixteen by sixteen pixel block.