图像增强是指按特定的需要突出一幅图像中的某些信息，同时，消弱或去除某些不需要的信息的处理方法。其主要目的是使处理后的图像对某些特定的应用比原来的图像更加有效。图像增强技术主要包含直方图修改处理、图像平滑化处理、图像尖锐化处理、和彩色处理技术等。图像增强有图像对比度增强、亮度增强，轮廓增强等等。(Image enhancement refers to the way in which certain information is highlighted in an image according to specific needs, and the processing method of eliminating or removing certain unnecessary information is also required. The main purpose is to make the processed image more effective than the original image for certain applications. Image enhancement technology mainly includes histogram modification processing, image smoothing processing, image sharpness processing, and color processing technology. Image enhancement has image contrast enhancement, brightness enhancement, contour enhancement and so on.)