Method of layer blending and reconstruction based on the alpha channel

An electronic device for layer blending and reconstruction based on an alpha channel comprising:

• a decoder for receiving mixed image data;
• removing transporter image data from the mixed image data to obtain blended image data;
• and reconstructing red-green-blue (RGB) image data and the alpha channel from the blended image data,
• wherein the decoder is configured to:
• calculate a plurality of cost values based on the mixed image data,
• interpolate an estimated value of Cr1 or Cr2 according to the plurality of cost values;
• and
• calculate an alpha value according to the estimated value of Cr1 or Cr2 according to expressions of Cr1=RGB*alpha, Cr2=RGB*alpha+255*(1-alpha), and alpha=1+(Cr1−Cr2)/255.

An electronic device for layer blending and reconstruction based on an alpha channel comprising:

• an encoder for layer blending the alpha channel and red-green-blue (RGB) image data to obtain blended image data;
• blending transporter image data with 1-alpha channel data to obtain a transporter;
• blending the transporter with the blended image data to obtain mixed image data;
• and transmitting the mixed image data to a decoder;
• and
• the decoder for receiving the mixed image data from the encoder;
• removing the transporter from the mixed image data to obtain blended image data;
• and reconstructing the red-green-blue (RGB) image data and the alpha channel from the blended image data,
• wherein the decoder is configured to:
• calculate a plurality of cost values based on the mixed image data,
• interpolate an estimated value of Cr1 or Cr2 according to the plurality of cost values;
• and
• calculate an alpha value according to the estimated value of Cr1 or Cr2 according to expressions of Cr1=RGB*alpha, Cr2=RGB*alpha+255*(1-alpha), and alpha=1+(Cr1−Cr2)/255.