Method for adaptively encoding motion image based on temporal and spatial complexity and apparatus therefor

Abstract

A method and an apparatus adaptively encode a motion image based on temporal and/or spatial complexity. In the method, encoding is performed with different temporal and spatial resolutions at frame rates based on the temporal and/or spatial complexity of an input image so that image data is stored with high efficiency. The method includes calculating a spatial complexity of input image data, determining a resolution by comparing the calculated spatial complexity with a predetermined threshold, and converting the resolution of the input image data based on the resolution.

1 . An adaptive image encoding method based on temporal complexity, comprising: 
 calculating a temporal complexity of input image data;    determining a frame rate by comparing the temporal complexity with a predetermined threshold; and    determining an outputted frame rate of the input image data based on the frame rate.    
   
   
       2 . The method of  claim 1 , wherein the temporal complexity is calculated based on a motion activity of each macro block of the input image data.  
   
   
       3 . The method of  claim 2 , wherein the motion activity is a size of a motion vector of the macro block.  
   
   
       4 . The method of  claim 3 , wherein the motion activity is MV1 2 +MV2 2  when the motion vector of the macro block is (MV1, MV2).  
   
   
       5 . The method of  claim 1 , wherein the calculating the temporal complexity and determining the frame rate are performed in units of GOPs of input image data.  
   
   
       6 . The method of  claim 1 , wherein the calculating the temporal complexity and determining the frame rate are performed in units of sequences of input image data.  
   
   
       7 . The method of  claim 2 , wherein if the input image data is encoded image data, the motion activity is calculated by using a motion vector obtained in a decoding operation of the input image data.  
   
   
       8 . An adaptive motion image encoding apparatus based on temporal complexity, comprising: 
 a temporal complexity calculation unit which calculates a temporal complexity of input image data;    a frame rate determining unit which determines a frame rate by comparing the temporal complexity with a predetermined threshold; and    a frame rate converting unit which determines an outputted frame rate of input image data based on the frame rate.    
   
   
       9 . The apparatus of  claim 8 , wherein the temporal complexity is calculated based on a motion activity of each macro block of the input image data.  
   
   
       10 . The apparatus of  claim 9 , wherein the motion activity is a size of a motion vector of the macro block.  
   
   
       11 . The apparatus of  claim 10 , wherein the motion activity is MV1 2 +MV2 2  when the motion vector of a macro block is (MV1, MV2).  
   
   
       12 . The apparatus of  claim 8 , wherein the calculation of the temporal complexity in the temporal complexity calculation unit and the determination of the frame rate in the frame rate determination unit are performed in units of GOPs of input image data.  
   
   
       13 . The apparatus of  claim 8 , wherein the calculation of the temporal complexity in the temporal complexity calculation unit and the determination of the frame rate in the frame rate determination unit are performed in units of sequences of input image data.  
   
   
       14 . The apparatus of  claim 9 , wherein, if the input image data is encoded image data, the motion activity is calculated by using a motion vector obtained in a decoding step of the input image data.  
   
   
       15 . A computer-readable medium having stored thereon computer-executable instructions for performing the method of  claim 1.