Image recording device that records moving image, method of controlling the same, and storage medium

A method of controlling an image recording device including an image pickup unit that outputs an image signal corresponding to an optical image, and a memory that records an image, comprising:

• causing said image pickup unit to pick up an image of an object over different exposure time periods to thereby output the plurality of image signals;
• synthesizing a plurality of image signals output from said image pickup unit to thereby obtain a synthesized image;
• recording the synthesized image in the memory at a predetermined frame rate;
• and
• differentiating respective vertical transfer periods for reading out the plurality of image signals according to the different exposure time periods, and controlling the sum of the vertical transfer periods to a time period defined by the predetermined frame rate.

A non-transitory computer-readable storage medium storing a computer-executable program for causing a computer to execute a method of controlling an image recording device including an image pickup unit that outputs an image signal corresponding to an optical image, and a memory that records an image,

• wherein the method comprises:
• causing said image pickup unit to pick up an image of an object over different exposure time periods to thereby output the plurality of image signals;
• synthesizing a plurality of image signals output from said image pickup unit to thereby obtain a synthesized image;
• recording the synthesized image in the memory at a predetermined frame rate;
• and
• differentiating respective vertical transfer periods for reading out the plurality of image signals according to the different exposure time periods, and controlling the sum of the vertical transfer periods to a time period defined by the predetermined frame rate.