Abstract: An image transmission method performed by instructions in an image transmission device including a processor and a memory storing the instructions executable by the processor includes, receiving a video, recognizing an object from the received video, generating metadata of the recognized object, calculating a score of the recognized object using the generated metadata; selecting the recognized object as a main object when the score exceeds a reference value, transmitting the metadata on the selected main object, and transmitting one of an image frame including the main object in the video and a best shot cropped from the image frame.