Image processing apparatus, image capturing apparatus, and program

1. An image processing apparatus for generating an interpolation frame to be inserted between a first frame and a second frame, contiguous with each other, of a moving picture obtained by an image capturing apparatus, the image processing apparatus comprising:

a motion vector calculation section configured to calculate a motion vector of an object by performing a matching operation between the first and second frames; and

an interpolation frame generation section configured to generate the interpolation frame such that:

the dependence of the interpolation frame on the calculated motion vector is increased if a detected magnitude of motion is less than or equal to a threshold value; and

the dependence of the interpolation frame on the calculated motion vector is decreased if the detected magnitude of motion is greater than the threshold value;

wherein the detected magnitude of motion represents motion of the image capturing apparatus from a point in time when the first frame is obtained to a point in time when the second frame is obtained, wherein the magnitude of motion is detected independent of content of the first and second frames.

2. The image processing apparatus of claim 1 , wherein the interpolation frame generation section is configured to generate, as the interpolation frame, a frame representing a transitional state between the first and second frames dictated based on the motion vector if the magnitude of motion representing motion of the image capturing apparatus is less than a predetermined threshold value, and otherwise generate, as the interpolation frame, a frame that is less dependent on the motion vector than a frame representing the transitional state.

3. The image processing apparatus of claim 2 , wherein the threshold value is set based on a size of a search range of the matching operation.

4. The image processing apparatus of claim 2 , wherein the interpolation frame generation section is configured to generate, as the interpolation frame, a frame obtained through a process including an arithmetic mean between the first and second frames if the magnitude of motion representing motion of the image capturing apparatus is greater than the threshold value.

5. The image processing apparatus of claim 4 , wherein the interpolation frame generation section is configured to generate, as the interpolation frame, a synthetic frame between a frame representing the transitional state and a frame obtained by an arithmetic mean between the first and second frames if the magnitude of motion representing motion of the image capturing apparatus is greater than the threshold value.

6. The image processing apparatus of claim 5 , wherein the interpolation frame generation section is configured to generate the synthetic frame by synthesizing together a frame representing the transitional state and a frame obtained by an arithmetic mean between the first and second frames at a different ratio depending on the magnitude of motion representing motion of the image capturing apparatus.

7. The image processing apparatus of claim 2 , wherein the interpolation frame generation section is configured to use the first frame or the second frame as the interpolation frame if the magnitude of motion of the image capturing apparatus is greater than the threshold value.

8. The image processing apparatus of claim 1 , wherein:

the motion vector calculation section is configured to divide each of the first and second frames into a plurality of blocks to calculate the motion vector by performing a matching operation for each of the divided blocks; and

the interpolation frame generation section is configured to generate the interpolation frame based on the motion vector calculated for each of the blocks.

9. An image capturing apparatus comprising:

the image processing apparatus of claim 1 ;

an image capturing section configured to generate data of a moving picture including the first and second frames through an image capturing operation; and

a motion detector configured to detect a motion of the image capturing apparatus and output the magnitude of motion representing motion of the image capturing section.

10. A computer program, stored on a non-transitory computer-readable medium, to be executed by a computer mounted in an image processing apparatus for generating an interpolation frame to be inserted between a first frame and a second frame, contiguous with each other, of a moving picture obtained by an image capturing apparatus, the computer program instructing the computer to execute the steps of:

calculating a motion vector of an object by performing a matching operation between the first and second frames; and

generating the interpolation frame such that:

the dependence of the interpolation frame on the calculated motion vector is increased if a detected magnitude of motion is less than or equal to a threshold value; and

the dependence of the interpolation frame on the calculated motion vector is decreased if the detected magnitude of motion is greater than the threshold value;

wherein the detected magnitude of motion representing motion of the image capturing apparatus from a point in time when the first frame is obtained to a point in time when the second frame is obtained, wherein the magnitude of motion is detected independent of content of the first and second frames.