1. A method of detecting camera defect, comprising: obtaining an image by a processing unit, the processing unit having a surface fit module, a subtraction module, and a peak quantification module, wherein the image is generated using a camera; determining a first autocorrelation map for a first sub-region in the image; determining, using the surface fit module, a first surface fit for first scene content in the first sub-region; subtracting, using the subtraction module, the first surface fit from the first autocorrelation map for the first sub-region in the image to obtain a first residual map; quantifying, using the peak quantification module, a first noise in the first residual map; and providing an indication based on a result from the act of quantifying the first noise to indicate whether the camera is defective or not.