JP2003319171A5 - - Google Patents

Claims (10)

Image discriminating means for discriminating whether the image signal is a natural image signal or a computer image signal generated by a computer in accordance with an input image signal;
An image signal processing comprising: an interpolation processing unit that selects a predetermined interpolation process according to a determination result of the image determination unit, performs a process on the input image signal by the selected interpolation process, and performs pixel number conversion apparatus. The image discrimination means performs a predetermined calculation using adjacent pixel data of the input image signal, and whether the input image signal is a natural image image signal or a computer image signal based on a result of the calculation. The image signal processing apparatus according to claim 1. The image discriminating means uses the data of the four adjacent first, second, third and fourth pixels of the input image signal and uses the absolute value of the difference between the first and second pixel data. And the absolute value of the difference between the third and fourth pixel data and the absolute value of the difference between the second and third pixel data are calculated, and the calculated ratio and a predetermined threshold are calculated. The image signal processing apparatus according to claim 1, wherein it is determined whether the input image signal is a natural image signal or a computer image signal based on a comparison result with a value.   The image signal processing apparatus according to claim 1, wherein the interpolation processing unit switches between linear interpolation and cubic interpolation based on a determination result of the image determination unit, and performs interpolation processing on the input image signal. The image signal processing apparatus according to claim 1, wherein the interpolation processing unit performs interpolation processing on the input image signal by switching between nearest neighbor interpolation and cubic interpolation based on a determination result of the image determining unit. The image signal according to claim 1, wherein the interpolation processing means switches between linear interpolation, nearest neighbor interpolation and cubic interpolation based on a determination result of the image determination means, and performs interpolation processing on the input image signal. Processing equipment. The image according to claim 2, wherein the image determination unit performs the calculation based on luminance data representing the luminance of adjacent pixels in the input image signal, and determines the input image signal based on the calculation result. Signal processing device. The image signal processing apparatus according to claim 7, wherein the interpolation processing unit switches the interpolation processing based on a determination result based on the luminance data, and performs the interpolation processing on the color difference signal of the input image signal. The image signal processing apparatus according to claim 1, wherein the image determination unit performs the determination in the horizontal direction and the vertical direction with respect to the input image signal. Said interpolation means, in accordance with the horizontal and vertical directions, respectively determination result, the image signal processing apparatus according to claim 9, wherein performing the interpolation processing in each of the horizontal and vertical directions.