Patent ID: 6178267
Filing Date: 2001-01-23
Classification: H04N

Abstract:
An image processing apparatus comprising:a threshold value processing circuit subjecting a correction value with respect to an input image data to a threshold value process and outputting an output image data;a subtracting circuit outputting an error signal based on a difference between the correction value and the output image data;an error filter distributing, as a distributing error data dependent on a value of a diffusion matrix, the error signal to neighborhood pixels of a target pixel within the input image data; anda correction circuit multiplying a coefficient to the input image data or a coefficient to the output image data,wherein said input image data has a range of 0 to n, said correction circuit has an output having a range of 0 to m when said correction circuit multiplies the coefficient to the input image data, and said correction circuit has an output having a range of 0 to 1 when said correction circuit multiplies the coefficient to the output image data, andwherein m, n and 1 are real numbers, and m<n<1.