Apparatus and method for transmitting images and apparatus and method for receiving images

1. 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, the image transmission method comprising:

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,

wherein at least one of the reference value, the metadata, and weights is changed according to a back-end request received from an image reception device connected to the image transmission device through a network, and

wherein the selected main object is changed from an object to another object in the image frame according to the change of the at least one of the reference value, the plurality of metadata, and the weights.

2. The image transmission method of claim 1 , wherein the recognizing of the object includes recognizing the object through motion sensing or artificial intelligence learning.

3. The image transmission method of claim 1 , wherein the main object is selected for each different recognized object, and

the metadata includes an identifier for identifying identity of the main object.

4. The image transmission method of claim 3 , wherein the main object is selected within a limited number for each object having the same identifier.

5. The image transmission method of claim 1 , wherein the image frame is a key frame included in the video, and

the key frame is a frame reconstructed without referring to other image frames.

6. The image transmission method of claim 1 , wherein the metadata used to calculate the score includes a plurality of metadata, and the score is calculated as a weighted sum obtained by multiplying the plurality of metadata by respective weights and then summing multiplication result values.

7. The image transmission method of claim 1 , wherein the metadata include one or more of a probability of the object, a type of the object, a property of the object, a sub-property of the object, an appearance time of the object, and a size and a position of the object.

8. The image transmission method of claim 1 , wherein at least one of the reference value, the metadata, and the weights is changed according to a current resource of the image transmission device or a back-end request received from an image reception device connected to the image transmission device through a network.

9. The image transmission method of claim 1 , wherein a set of the transmitted metadata is changed according to a current resource of the image transmission device or a back-end request received from an image reception device connected to the image transmission device through a network.

10. The image transmission method of claim 1 , wherein one of the image frame including the main object and the best shot is selected according to a current resource of the image transmission device or a back-end request received from an image reception device connected to the image transmission device through a network and is transmitted to the image reception device.

11. An image display method performed by instructions in an image reception device including a processor and a memory storing the instructions executable by the processor, the image display method comprising:

receiving metadata on a main object selected in an image transmission device connected to the image reception device through a network;

receiving one of an image frame including the main object in a video obtained by the image transmission device or a best shot cropped from the image frame;

generating a best shot by cropping a partial image occupied by the main object in the image frame using the metadata on the main object when the image frame including the main object is received; and

displaying at least one of the received best shot and the cropped best shot on a screen,

wherein the method further comprises transmitting a back-end request to the image transmission device,

wherein the image frame including the main object, received from the image transmission device is changed from a first image frame to a second image frame according to the back-end request, and

wherein the first image frame includes an object as the main object and the second image frame includes another object as the main object.

12. The image display method of claim 11 , wherein the metadata includes an identifier for identifying identity of the main object, and the displaying includes collecting a limited number of partial images for each object having a different identifier and displaying the collected partial images on the screen.

13. The image display method of claim 12 , further comprising:

receiving an object search condition from a user; and

filtering only partial images satisfying the object search condition among the partial images and displaying the filtered partial images on the screen.

14. The image display method of claim 11 , further comprising:

receiving an object search condition and an environment condition from a user; and

filtering the partial image and displaying the filtered partial image on the screen when the partial image satisfies the object search condition and the image frame including the partial image satisfies the environment condition.

15. The image display method of claim 11 , further comprising performing image analysis in order to identify identity of the main object,

wherein the displaying includes collecting a limited number of partial images for each object having a different identifier and displaying the collected partial images on the screen.

16. The image display method of claim 11 , further comprising transmitting a back-end request to the image transmission device,

wherein a set of the metadata received from the image transmission device is changed according to the back-end request.

17. The image display method of claim 11 , further comprising transmitting a back-end request to the image transmission device,

wherein it is determined whether the image frame including the main object is received or the best shot is received from the image transmission device according to the back-end request.