Linear Position Control for the Autofocus of Cameras Using Wavelet Decomposition

Automated focus adjustment is a critical aspect of modern camera systems, enabling the capture of sharp and clear images. This paper's novel approach is to automate focus adjustment using wavelet decomposition. The image is decomposed into different frequency subbands using wavelet transform. By computing a focus measure using each subband which quantifies the sharpness or clarity of the image at that particular time, the optimal focus position is found. The algorithm effectively searches for the position that maximises the overall image sharpness and gives the accurate focused image. A web Camera, linear actuator and Arduino UNO microcontroller is used in the project.