"图像灰度校正" can be translated into English as "image grayscale correction" or "image gray level correction".
"Image grayscale correction" is more commonly used and directly refers to the process of adjusting the grayscale values in an image to correct for any inaccuracies or to enhance the image quality.
"Image gray level correction" is also a valid translation, where "gray level" is another way to refer to the intensity or brightness values in a grayscale image.
Both translations are accurate and convey the same meaning.