Patent ID: 6384937
Filing Date: 2002-05-07
Classification: G06T,H04N

Abstract:
An image processing method for carrying out graininess suppression to input image signals which have been obtained by photoelectrically reading a film original by an image reading device, comprising the steps of:separating the input image signals into at least three kinds of frequency components composed of lowest frequency components a band of which is made more narrower, when it is determined that the film original is at least one of an under-exposed negative film and a high sensitive film, as compared with a case that the film original is neither the under-exposed negative film nor the high sensitive film, frequency components containing high frequency components and at least one kind of remaining frequency components; enhancing said frequency components containing the high frequency components; as well as suppressing at least one kind of frequency components of said at least one kind of the remaining frequency components; and synthesizing said enhanced frequency components, said suppressed frequency components and said lowest frequency components.