Method, apparatus and electronic device for processing panoramic image

An apparatus for processing a panoramic image, the apparatus comprising:

• a processor;
• and
• a memory storing program instructions that cause the processor to:
• convert a first planar projection image of the panoramic image into a spherical image;
• determine a position of a region of interest in the spherical image;
• and
• cut and expand, based on the position of the region of interest in the spherical image, the spherical image to obtain a second planar projection image of the panoramic image, wherein
• a distance between the region of interest in the second planar projection image and a center point of the second planar projection image is shorter than a distance between the region of interest in the first planar projection image and a center point of the first planar projection image, and
• the cutting and expanding of the spherical image based on the position of the region of interest in the spherical image includes:
• determining longitude α of a center point of the region of interest in the spherical image;
• determining an intersection A between a meridian of α+180° longitude of the spherical image and an equator of the spherical image,
• cutting the spherical image along a cutting line on the equator, a length of the cutting line being equal to half of a length of the equator, and a center point of the cutting line being the intersection A;
• and
• expanding the cut spherical image in a first direction and a second direction, respectively, the first direction being a direction from the intersection A to a south pole of the spherical image, and the second direction being a direction from the intersection A to a north pole of the spherical image.

An electronic device for processing a panoramic image, the electronic device comprising:

• a memory storing computer-readable instructions;
• and
• one or more processors configured to execute the computer-readable instructions such that the one or more processors are configured to
• convert a first planar projection image of the panoramic image into a spherical image;
• determine a position of a region of interest in the spherical image;
• and
• cut and expand, based on the position of the region of interest in the spherical image, the spherical image, and obtain a second planar projection image of the panoramic image, wherein
• a distance between the region of interest in the second planar projection image and a center point of the second planar projection image is shorter than a distance between the region of interest in the first planar projection image and a center point of the first planar projection image, and
• the cutting and expanding of the spherical image based on the position of the region of interest in the spherical image includes:
• determining longitude α of a center point of the region of interest in the spherical image;
• determining an intersection A between a meridian of α+180° longitude of the spherical image and an equator of the spherical image;
• cutting the spherical image along a cutting line on the equator, a length of the cutting line being equal to half of a length of the equator, and a center point of the cutting line being the intersection A;
• and
• expanding the cut spherical image in a first direction and a second direction, respectively, the first direction being a direction from the intersection A to a south pole of the spherical image, and the second direction being a direction from the intersection A to a north pole of the spherical image.