Back to results
US 10,432,854 B2Granted
Image processing apparatus to determine whether there is fog or mist in a captured image
AssigneeCanon Kabushiki Kaisha
InventorShingo Hirayama
Life of this patent
Estimating the term…
Abstract
A histogram is detected from an acquired image, and a ratio of a pixel distribution for a range from a preliminarily set low-brightness-side determination point to a preliminarily set high-brightness-side determination point to the entire histogram is calculated for the detected histogram. In a case where the ratio exceeds a preliminarily set threshold, it is estimated that there is fog or mist and a subject looks hazy.
Claims14
An image processing apparatus comprising:
- an image acquisition unit configured to acquire an image of a subject;
- a calculation unit configured to calculate a ratio of a number of pixels having brightness values in a brightness range to a total number of pixels in an entire image;
- an image processing unit configured to emphasize a contrast of the image when the ratio is equal to or greater than a first threshold;
- and
- a control unit configured to change a brightness range for calculating the ratio based on at least one of an illuminance of the subject obtained from the image and an exposure target value used when the image is acquired.
2 more elements
Dependencies are inferred from the claim text.