Method of color palette coding applicable to electronic device and electronic device using the same

Abstract

The disclosure is directed to a method of color palette coding and an electronic device using the same method. The proposed method would include not limited to encoding, by using a processor, a bit stream to represent a color of a coding unit and storing the bit stream in a storage medium or transmitting the bit stream. The bit stream would include not limited to a binary bit representing a run flag, a N binary bit sequence representing up to 2 N major colors in a coding unit with each of the possible values of the N binary bit sequence representing an unique major color index of N major color indices, and a M binary bit sequence representing up to 2 M extended colors with each of the possible values of the M binary bit sequence representing an unique extended color index of M extended color indices.

What is claimed is: 
     
         1 . A method of color palette for implementing a binary representation of a color applicable to an electronic device, the method comprising:
 encoding, by using a processor, a bit stream to represent a color of a coding unit, wherein the bit stream comprises:
 a binary bit representing a run flag; 
 a N binary bit sequence representing up to 2 N  major colors in a coding unit with each of the possible values of the N binary bit sequence representing an unique major color index of N major color indices; and 
 a M binary bit sequence representing up to 2 M  extended colors which are not the major colors and appears less frequently than the major colors in the coding unit with each of the possible values of the M binary bit sequence representing an unique extended color index of M extended color indices; 
   encoding, by using the processor, a second bit stream to represent a color of a second coding unit, wherein the second bit stream comprises:
 a second binary bit representing a second run flag; 
 a pixel level alternative escape flag; 
 a second M binary bit sequence representing up to 2 M  extended colors; and 
   a second original color value to represent an escape color of the second coding unit; and   storing the bit stream and the second bit stream in a storage medium to be decoded and displayed or transmitting the bit stream and the second bit stream to a video driver to be decoded and displayed.   
     
     
         2 . The method of  claim 1 , wherein when the pixel level alternative escape flag is a first value, the color of the second coding unit is represented by the N major color indices, and when the pixel level alternative escape flag is a second value, the color of the second coding unit is represented by the M extended color indices. 
     
     
         3 . The method of  claim 2 , wherein only when the pixel level alternative escape flag is active, the run flag indicates the copy above mode, the pixel level alternative escape flag indicates the first value. 
     
     
         4 . The method of  claim 3  further comprising:
 encoding, by using the processor, a third bit stream to represent a color of a third coding unit, and wherein if the color of the third coding unit is a third escape color, the third bit stream comprises:
 a third binary bit indicating the copy above mode; 
 a pixel level alternative escape flag set to active; and 
 a third original color value to represent the third escape color. 
 
 
     
     
         5 . The method of  claim 4 , wherein if the color of the third coding unit is not the third escape color,  claim 5  further comprising:
 the third binary bit indicating the copy above mode; 
 the pixel level alternative escape flag set to inactive; and 
 a copy above run value associated with the copy above mode. 
 
     
     
         6 . The method of  claim 1  further comprising:
 encoding, by using the processor, a fifth bit stream to represent a color of a fifth coding unit and comprises a pixel level alternative escape flag, wherein if the pixel level alternative escape flag is set as inactive, the fifth bit stream further comprises a third N binary bit sequence representing up to 2 N  major colors in a coding unit with each of the possible values of the N binary bit sequence representing an unique major color index of N major color indices except for a last index indicating an escape color. 
 
     
     
         7 . The method of  claim 6 , wherein if the pixel level alternative escape flag is set as active, the last index indicates one of the major colors. 
     
     
         8 . The method of  claim 7 , wherein if the pixel level alternative escape flag is set as active, the last index refers to one of the extended colors.