Patent ID: 7136107
Filing Date: 2006-11-14
Classification: H04N

Abstract:
1. An image conversion unit for converting an interlaced input image into a de-interlaced output image, the image conversion unit comprising: an input for receiving an input image signal, said input image signal including a sequence of odd numbered lines containing pixels followed by a sequence of even numbered lines containing pixels, said even numbered lines spatially intervening with said odd numbered lines; first computing means for computing a first weighted sum of a first group of pixel values, the first group of pixel values corresponding to pixels of the input image; second computing means for computing a second weighted sum of a second group of interpolated values, the second group of interpolated values being computed by interpolation for spatial locations which are not present in the sampling grid of the input image, the second weighted sum being computed based on filter coefficients, the sum of filter coefficients being substantially equal to zero; combining means for computing a third sum by combining the first weighted sum and the second weighted sum; clipping means for clipping the third sum between a minimum value and a maximum value, the minimum value derived from a third group of pixel values of the input image and the maximum value derived from a fourth group of pixel values of the input image; and an output coupled to said clipping means for providing an output image signal corresponding to the input image signal with interpolated intervening pixels.