JP2017225061A5 - Image pickup apparatus, control method thereof, program - Google Patents

Description

The present invention relates to an imaging device for shooting a starry sky , a control method thereof, and a program .

Imaging device according to the present invention includes a first starry shooting modes selectable selection means for taking starry, in the first starry shooting mode, it performs continuous shooting, to obtain a plurality of images A photographing unit; and a vector calculation unit that calculates a motion vector of a star using two of a plurality of images continuously photographed by the photographing unit ;
Image processing means for generating a starry sky image by correcting and combining the positional deviations of the stars in the plurality of images due to star movement based on the motion vector of the star calculated by the vector calculation means ,
The vector calculation means is characterized in that the motion vector of the star is calculated using two images of which photographing time is not adjacent among the plurality of images.

Claims (9)

An imaging device,
Selection means capable of selecting a first starry sky shooting mode for shooting a starry sky;
In the first starry shooting mode, it performs continuous shooting, the shooting means for obtaining a plurality of images,
Vector calculation means for calculating a star motion vector using two of the plurality of images continuously photographed by the photographing means ;
Image processing means for generating a starry sky image by correcting and combining the positional deviations of the stars in the plurality of images due to star movement based on the motion vector of the star calculated by the vector calculation means ,
The image pickup apparatus, wherein the vector calculation unit calculates the motion vector of the star using two images of which the photographing time is not adjacent among the plurality of images.   2. The image processing means according to claim 1, wherein the amount of positional deviation of the star in each image is determined from the motion vector of the star calculated by the vector calculation means in accordance with the difference in photographing time. Imaging device.   The said vector calculation means calculates the motion vector of the said star using two images image | photographed at the beginning and the end among the said several images, The motion vector of Claim 1 or Claim 2 characterized by the above-mentioned. Imaging device. The image processing apparatus further includes a reliability calculation unit that calculates the reliability of the motion vector of the star calculated by the vector calculation unit based on the difference between the shooting times of the two images used for the calculation.
The vector calculation means until said reliability is equal to or higher than a predetermined level, repeatedly calculated by changing the two images set, the imaging apparatus according to claim 1 or claim 2, characterized in that.   5. The image pickup apparatus according to claim 4, wherein the vector calculation unit repeatedly changes the set of two images in order from the one with the largest difference in photographing time. The selection means may further select a second starry sky shooting mode for shooting a starry sky,
The imaging apparatus according to any one of claims 1 to 5, wherein the second starry sky shooting mode is a mode for shooting a locus of the circling motion of the star. The imaging device according to any one of claims 1 to 6, wherein the image processing unit generates a starry sky image in which noise is suppressed by the combination. It is a control method of an imaging device, and
A selection step capable of selecting a first starry sky shooting mode for shooting a starry sky;
In the first starry sky shooting mode, a shooting step of shooting continuously and acquiring a plurality of images;
A vector calculation step of calculating a star motion vector using two of the plurality of images continuously photographed in the photographing step;
An image processing step of generating a starry sky image by correcting and combining the positional deviations of the stars in the plurality of images due to the star movement based on the star motion vector calculated in the vector calculation step; ,
In the vector calculation step, a motion vector of the star is calculated using two images of the plurality of images which are not adjacent to each other at shooting times. A computer-executable program that causes a computer to function as the imaging device according to any one of claims 1 to 6.