Patent ID: 6246494
Filing Date: 2001-06-12
Classification: H04N

Abstract:
An image reading apparatus, comprising:a reading unit for photoelectrically reading images of a plurality of frames recorded on a film and outputting the images as image data of three primary colors; anda condition setting unit for creating density histograms of the images of said plurality of frames read by said reading unit, calculating a characteristic value of the film from the density histograms of the images of said plurality of frames and determining image processing conditions for an image of each frame from the characteristic value of the film and the image data of the image of each frame,wherein said condition setting unit calculates a characteristic value of the film by approximating by means of a method of least squares a relationship among the three primary colors of a specific point on a side where a cumulative frequency is low and a specific point on the side where the cumulative frequency is high which are obtained from the density histograms of the images of the respective frames.