Employment of the appropriate range of sawtooth-shaped-function illumination intensity to improve the image quality

The medical image quality determines the accuracy of diagnosis. To acquire higher signal-to-noise ratio (SNR) and higher quality image, based on the sawtooth-shaped-function (SSF) illumination technique and frame-accumulation algorithm, this paper presents a method of selecting the appropriate range of SSF illumination intensity. By avoiding the weak light intensity and strong light intensity near the camera saturation area, an appropriate range of illumination intensity is gotten, where the SNR of image is higher. The experimental results show that, compared with the previous SSF illumination and constant illumination methods, this proposed method can obtain the image with higher SNR and gray-scale resolution that is to obtain higher quality image. Moreover, this illumination method provides a reference for improving the medical image quality from the point of image acquisition.