| 摘要 |
Endoscopic apparatus configured to capture an image of in-vivo tissue and configured to perform automatic exposure control and a method for automatic exposure control of an endoscopic apparatus configured to capture an image of in-vivo tissue. The method comprising: (i) capturing image data on an image sensor using an exposure period, that image data comprising: an indication of brightness captured by each pixel of the image sensor; (ii) analysing the indication of brightness of each pixel to determine whether the captured image data is saturated; and when it is determined that the captured image data is saturated: (iii) reducing the exposure period by a first increment, and repeating steps (i) and (ii) until it is determined that the captured image data is not saturated; when it is determined that the captured image data is not saturated: (iv) analysing the indication of brightness of each pixel to determine whether a threshold indicative of use of a selected proportion of an available dynamic range of the image sensor has been reached; and when it is determined that the threshold has not been reached: increasing the exposure period by a second increment; wherein the first increment has a magnitude at least three times that of the second increment. Aspects and embodiments described may provide a means to capture useful images of in-vivo tissue, such images typically being prone to saturation as a result of the disparity of reflectivity of tissue on a small scale. |
