| 摘要 |
PURPOSE:To reduce the accumulation of errors by comparing the relation in magnitude of two corresponding photoelectric converting output values, as a signal processing method for focus detection using a shift of two images, and adding selectively one of two output values basing on its result. CONSTITUTION:According to an operation process adopted as a correlative value calculating method for executing an operation by displacing relatively one image against the other image, an intensity distribution information a(i) and b(i) of two images are made to correspond to each other basing on a constant relative relation, relations of magnitude of binary groups a(j1), b(j2) which are made to correspond in this way are compared, and only one is selected and added by its result. For instance, by use of an expression I or an expression II, an operation is executed with respect to each different (m). A range of (i) which takes the sum is determined from the condition that each subscript (i), (i)+(k)-(m), (i)+(k), and (i)-(m) must enter into a closed section [1, N]. A graph in which V(m) operated by the expression I and the expression II is plotted against (m) becomes as hown in the chart. |
