Terminal and method for setting data protocol for photographed image
According to an embodiment of the present disclosure, in a terminal, in addition to event information in the ONVIF format, information for determining rotation and information about a cropped region cropped from an original region are additionally transmitted.
1. A method of setting a data protocol for an image photographed using a terminal, the method comprising:
detecting first region information from a coordinate system of an original image that is initially captured using the terminal;
detecting second region information from a coordinate system of an encoding stream obtained by encoding the original image;
incorporating, into metadata, information of conversion between the coordinate system of the original image and the coordinate system of the encoding stream or information of conversion between the first region information and the second region information, and transmitting the metadata, wherein the incorporating and the transmitting is performed by a transmitting unit of the terminal.
2. The method of claim 1 , wherein the information of conversion between the coordinate system of the original image and the coordinate system of the encoding stream comprises at least one of a scale conversion value of an x-axis and a y-axis, a flip value of the x-axis and the y-axis, a mirror value of the x-axis and the y-axis, or a rotation value of the x-axis and the y-axis.
3. The method of claim 2 , wherein the rotation value is an integer value indicating from −359 degrees to +359 degrees, and denotes a degree of x-axis rotation and y-axis rotation of the coordinate system of the original image, wherein a positive rotation value indicates clockwise rotation, and a negative rotation value indicates counterclockwise rotation.
4. The method of claim 2 , wherein the rotation value is
(
COS
Θ
-
SIN
Θ
S
I
N
Θ
COS
Θ
)
(
x
y
)
=
(
x
′
y
′
)
displayable by using a rotation conversion matrix rotated by Θ above.
5. The method of claim 1 , wherein the information of conversion between the first region information and the second region information comprises region information of a region cropped from a first region,
wherein the region information of the cropped region is represented by a horizontal length and a vertical length of the first region information and the cropped region.
6. The method of claim 1 , wherein when a resolution of the original image is different from a resolution of the encoding stream, or when a recording resolution of the original image is different from a reproduction resolution of a client terminal that receives and reproduces the encoding stream,
the metadata comprises region information of a region cropped from the first region information, and converted values of an x-axis scale value and a y-axis scale value.
7. The method of claim 1 , wherein a client terminal that receives and reproduces the encoding stream that supports Dynamic Cropping determines from which region of the first region the cropped region is cropped, by using region information of the region cropped from the first region included in the metadata, in real time.
8. The method of claim 1 , wherein the transmitting unit of the terminal transmits, with respect to each frame, information of conversion between the coordinate system of the original image and the coordinate system of the encoding stream or information of conversion between the first region information and the second region information.
9. The method of claim 1 , wherein, when a rotatable image sensor is mounted on the terminal, every time a rotational angle of the image sensor changes, the transmitting unit of the terminal transmits information of conversion between the coordinate system of the original image resulting from the changed rotational angle of the image sensor and the coordinate system of the encoding stream.
10. The method of claim 1 , wherein, when a gyro sensor is mounted in the terminal, every time the gyro sensor detects a change in an image angle value of the terminal, the transmitting unit of the terminal transmits information of conversion between the coordinate system of the original image resulting from the change in the image angle value of the terminal and the coordinate system of the encoding stream.
11. The method of claim 10 , wherein the terminal is a drone.
12. The method of claim 1 wherein a client unit that receives the metadata and an image stream transmitted by the transmitting unit of the terminal is capable of storing together the received image stream and the first region information that is determined based on the metadata.
13. The method of claim 1 , wherein a data protocol for the image photographed using the terminal complies with the ONVIF standard.
14. A terminal for setting a data protocol for a photographed image, the terminal comprising:
a controller which detects first region information indicating an original image from a coordinate system of an initially captured original image, and which detects second region information indicating an encoded image from a coordinate system of an encoding stream obtained by encoding the original image; and
a transmitting unit which incorporates, into metadata, information of conversion between the coordinate system of the original image and the coordinate system of the encoding stream or information of conversion between the first region information and second region information, and transmits the metadata.
15. The terminal of claim 14 , wherein the information of conversion between the coordinate system of the original image and the coordinate system of the encoding stream comprises at least one of a scale conversion value of an x-axis and a y-axis, a flip value of the x-axis and the y-axis, a mirror value of the x-axis and the y-axis, or a rotation value of the x-axis and the y-axis.
16. The terminal of claim 14 , wherein the information of conversion between the first region information and the second region information comprises region information about a region cropped from a first region.