Underwater image real-time enhancement method and system based on FPGA

The invention discloses an underwater image real-time enhancement method and system based on an FPGA, and the method comprises the steps: S1, eliminating the number of each gray level of a stored image, inputting an ith frame of image, and calculating and storing the number of each gray level of the frame of image and the accumulated number of each gray level; s2, eliminating the number of each gray level of the stored ith frame of image, inputting an (i + 1) th frame of image, counting the number of each gray level and storing, and after counting the number of each gray level, sending a counting completion signal; s3, performing remapping calculation on the image data of the (i + 1) th frame and the accumulated number data of each gray level of the image of the ith frame to obtain enhanced image data, and outputting the enhanced image data; and S4, starting accumulation calculation of the number of each gray level of the image of the (i + 1) th frame, and storing the accumulated number of each gray level of