IMAGING DEVICE AND PHASE DIFFERENCE DETECTION METHOD

摘要

An imaging device includes an imager, and a processor including hardware. The processor is configured to implement a phase difference detection process that calculates an average value of a pixel value of a first image and a pixel value of a second image that have been subjected to a normalization process, and calculates a correlation coefficient based on a value obtained by adding up the values obtained by subjecting the pixel value of the first image and the pixel value of the second image that have been subjected to a subtraction process within a fall interval in which the average value decreases, and a value obtained by adding up the values obtained by subjecting the pixel value of the first image and the pixel value of the second image that have been subjected to the subtraction process within a rise interval in which the average value increases.

主权项

1. An imaging device comprising:
an imager that captures a first object image and a second object image that have parallax with respect to an identical object; and a processor comprising hardware, the processor being configured to implement: a phase difference detection process that calculates a correlation coefficient between a first image in which the first object image is captured, and a second image in which the second object image is captured, and detects a phase difference between the first image and the second image based on the correlation coefficient, wherein the processor is configured to implement the phase difference detection process that subjects a pixel value of the first image and a pixel value of the second image to a normalization process, calculates an average value of the pixel value of the first image and the pixel value of the second image that have been subjected to the normalization process, and calculates the correlation coefficient based on a value obtained by adding up values obtained by subjecting the pixel value of the first image and the pixel value of the second image that have been subjected to the normalization process to a subtraction process within a fall interval in which the average value decreases, and a value obtained by adding up values obtained by subjecting the pixel value of the first image and the pixel value of the second image that have been subjected to the normalization process to the subtraction process within a rise interval in which the average value increases.