Downsizing an encoded image

A system for downsizing an input disjoint block level encoded image, comprising:

• a DCT domain processor adapted to implement a DCT domain process, the DCT domain processor comprising:
• a DCT downsize configurator adapted to calculate a DCT downsize ratio for downsizing the input image in a DCT domain according to a target downsize ratio and according to a size of a DCT transform length associated with the input image;
• an I-DCT engine configured to adapt an I-DCT operation according to the DCT domain downsize ratio;
• said DCT domain processor is adapted to provide an intermediate image as output of the DCT domain process;
• and
• a pixel domain processor adapted to apply a pixel domain interpolation operation to the intermediate image according to dimensions of the intermediate image and according to dimensions of the target image.

A program storage device readable by machine, tangibly embodying a program of instructions executable by the machine to perform a method of downsizing an input disjoint block level encoded image, comprising:

• calculating a DCT downsize ratio for downsizing the input image in a DCT domain according to a target downsize ratio and according to a size of a DCT transform length associated with the input image;
• adapting an I-DCT according to the DCT domain downsize ratios;
• performing the adapted I-DCT;
• providing an intermediate image as output of a DCT domain process;
• and
• applying a pixel domain interpolation to the intermediate image according to dimensions of the intermediate image and according to dimensions of the target image.

A computer program product comprising a computer useable medium having computer readable program code embodied therein of downsizing an input disjoint block level encoded image, the computer program product comprising:

• computer readable program code for causing the computer to calculate a DCT downsize ratio for downsizing the input image in a DCT domain according to a target downsize ratio and according to a size of a DCT transform length associated with the input image;
• computer readable program code for causing the computer to adapt an I-DCT according to the DCT domain downsize ratios;
• computer readable program code for causing the computer to perform the adapted I-DCT
• computer readable program code for causing the computer to provide an intermediate image as output of a DCT domain process;
• and
• computer readable program code for causing the computer to apply a pixel domain interpolation to the intermediate image according to dimensions of the intermediate image and according to dimensions of the target image.