The invention discloses a method and
system for optimizing
image quality during a video call. The method comprises the following steps: detecting the network transmission speed between a sending end and a receiving end by receiving a
video image uploaded by the sending end; if the network transmission speed is lower than or equal to a preset network speed threshold, reducing the
frame rate of the
video image according to the network transmission speed, and detecting the definitions of pictures in the
video image; and selecting the pictures, of which the definitions are higher than or equal to a definition threshold, from the video image according to the reduced
frame rate to form a key video, and sending the key video to the receiving end. The method and the
system provided by the invention have the advantages that a
server carries out screening of the video image to be transmitted to the receiving end when detecting poor
network conditions of the sending end and the receiving end, the high-definition pictures are screened to form the key video, and the key video is transmitted to the receiving end; therefore, the download pressure of the receiving end is alleviated, the definition of the video call is ensured, the quality of the video call is improved, and a user can achieve better conversation experience even if network signals are weak.