The present invention is a digital camera having a is predetermined as a droplet size distribution measuring method of measuring the liquid droplet size that is included in a spray, a predetermined pixel value to a predetermined region of said spraying it relates to a droplet size distribution measuring method, and more particularly by shooting in obtaining the image; Calculating a brightness value of each pixel of the photographed image; Noise removal step of removing background noise in the captured images; An outline determination step of determining the outline of droplets in the image; Labeling step of labeling the enemy with different numbers each solution; Removing non-spherical droplet removing small non-spherical (non-spherical) of the liquid droplet; Non-focus liquid droplet removal steps to remove the non-focus less (out-od-focus) of the liquid; The residual liquid for the enemy to an area by applying Equation 1 to obtain the diameter of the droplet diameter calculating step; Droplet size, including relates to distribution measurement method.
(Formula 1)