A novel line-based intra coding method is presented to improve the coding efficiency by both prediction and transform.Firstly,the spatial multi-prediction is performed line by line in horizontal or vertical direction within a macroblock using the pixels of the adjacent column or row as the reference,which improves the prediction accuracy by shortening the distance between the reference and current pixels.Secondly,on the basis of the original 4×4 discrete cosine transform(DCT),a 1×16 one-dimensio...