1. A computer-implemented method for providing an estimation of a point spread function indicative of intrinsic lens blur of a camera, the method comprising: successively displaying at least two images on a same display unit, the at least two images comprising visual features, elements having a different optical intensity, and a test pattern; acquiring the at least two images using the camera; determining a coordinate transformation using the image displayed comprising the visual features and the corresponding acquired image, the coordinate transformation for aligning together a coordinate system of the camera and a coordinate system of the display unit; aligning the acquired image comprising the elements having a different optical intensity using the determined coordinate system and determining a difference of intensity between the displayed image comprising the elements having a different optical intensity and the corresponding acquired image; aligning the acquired image comprising the test pattern using the determined coordinate transformation and correcting an intensity of the acquired image comprising the test pattern using the determined difference of intensity, thereby obtaining a corrected image; estimating a point spread function using the corrected image; and outputting the estimation of the point spread function.