@param corners Output array of detected corners.
@param flags Various operation flags that can be zero or a combination of the following values:
- **CALIB_CB_NORMALIZE_IMAGE** Normalize the image gamma with equalizeHist before detection.
-- **CALIB_CB_EXHAUSTIVE ** Run an exhaustive search to improve detection rate.
-- **CALIB_CB_ACCURACY ** Up sample input image to improve sub-pixel accuracy due to aliasing effects.
+- **CALIB_CB_EXHAUSTIVE** Run an exhaustive search to improve detection rate.
+- **CALIB_CB_ACCURACY** Up sample input image to improve sub-pixel accuracy due to aliasing effects.
This should be used if an accurate camera calibration is required.
The function is analog to findchessboardCorners but uses a localized radon