an encoding method of screen frame and its application of electronic devices , which rapidly detect motion regions and motionless regions from lossless screen frames captured by software , and then encode the motion regions with lower image quality while encode motionless regions with higher quality to display higher quality images and smooth video at a receiving end in real - time . furthermore , the above - mentioned encoding method is optimized for lossless screen frames which does not need complicated operations of video encoder of prior art , such as motion estimation , motion compensation , etc ., so that the method can be implemented with minor system resources and lower latency delay .