ELECTRONIC CAMERA WITH OVER-SAMPLING FILTER AND METHOD FOR OVER-SAMPLING AND INTERPOLATING ELECTRONIC CAMERA IMAGE DATA

A method and apparatus for processing image data produced by an electronic camera (such as image data read from a CCD device of an electronic camera) by over-sampling and then interpolating the data to convert the format and/or resolution of the data. The format of the image data may be converted to a format suitable for display on a computer monitor or the like. The invention enables the aspect ratio of a frame of image data output from a CCD device to be converted to 1:1. Preferably, the image data are filtered by a filter having a characteristic opposite to the frequency characteristic of the interpolation function, and then interpolated so that the interpolation can be carried out at a portion where the change of the frequency characteristic is small, thereby improving the image quality of the fully processed output image. The invention can be implemented in an electronic camera including an over-sampling filter (4) for over-sampling input data N times and an interpolation circuit (5) for interpolating the output from the over-sampling filter.