| 摘要 |
The invention provides for a method of, and related apparatus for discriminating between synthetic and natural regions of an image composed of a matrix of rows and columns of pixels. The method comprises the steps of: dividing a matrix of luminance values of the pixels of the image into blocks, the blocks representing a block map identifying whether the blocks are of a natural image type or a synthetic image type by analysis of a gradient matrix (G) of luminance gradients of the luminance values in the block and clustering blocks of a same image type into respective natural and synthetic regions of the image. The step of identifying whether the blocks are of the natural image type or the synthetic image type comprises the step of calculating the gradient matrix (G) within each block on the basis of a first order difference value of the luminance values L of the pixels in a row and a column direction of the block.
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