Device and Method of Downscaling and Blending Two High Resolution Images

• US 20070248284A1
• Filed: 06/09/2005
• Published: 10/25/2007
• Est. Priority Date: 06/21/2004
• Status: Abandoned Application

• Current Assignee: Koninklijke Philips N.V.
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Peters, Robert, Bernsen, Johannes
• Application Number:
  US11/570,506
• Publication Number:
  US 20070248284A1
• Time in Patent Office: Days
• US Class Current: 382/298
• CPC Class Codes: H04N 19/48 using compressed domain processing techniques other than decoding, e.g. modification of transform coefficients, variable length coding [VLC] data or run-length data motion estimation in a transform domain H04N19/547; processing of decoded motion vectors H04N19/513
• CPC Class Codes: H04N 19/59 involving spatial sub-sampling or interpolation, e.g. alteration of picture size or resolution
• CPC Class Codes: H04N 19/60 using transform coding

Abstract

The present invention relates to the field of downscaling and blending of two high resolution images, and particularly to a device and a method allowing for downscaling and blending of a HD JPEG background image and a HD bitmap image, which is overlaid on the JPEG background image. The device comprises means for downscaling the background image by a pre-determined factor n1, n2, . . . n_N; means for uncompressing the downscaled background image and the high-resolution bitmap image; means for dividing the uncompressed high-resolution bitmap image into blocks of n1×n2× . . . ×nN pixels, whereby the size of each block correspond to the size of each pixel of the downscaled background image; and, means (16) for blending each of the blocks of the uncompressed high-resolution bitmap image with each of the pixels of the downscaled background image and thus producing a blended image.

Claims

1. A device for downscaling and blending of a high-resolution compressed background image comprising pixels and a high-resolution compressed bitmap image comprising pixels, comprising:

means for downscaling the background image by a predetermined factor;

means for uncompressing the downscaled background image;

means for uncompressing the high-resolution bitmap image;

means for dividing the uncompressed high-resolution bitmap image into blocks of pixels, whereby the size of each block correspond to the size of each pixel of the downscaled background image; and

means for blending each of the blocks of the uncompressed high-resolution bitmap image with each of the pixels of the downscaled background image and thus producing a blended image.

2. A device according to claim 1, wherein the blending means is arranged to use at least one look-up table and combine the values of the pixels within the block of the uncompressed high-resolution bitmap image.

3. A device according to claim 1, wherein the scaling means is arranged to downscale the background image in the Discrete Cosine transform domain.

4. A method of downscaling and blending of a high-resolution compressed background image comprising pixels and a high-resolution compressed bitmap image comprising pixels, comprising the steps of:

downscaling the background image by a predetermined factor;

uncompressing the downscaled background image;

uncompressing the high-resolution bitmap image;

dividing the uncompressed high-resolution bitmap image into blocks of pixels, whereby the size of each block correspond to the size of each pixel of the downscaled background image; and

blending each of the blocks of the uncompressed high-resolution bitmap image with each of the pixels of the downscaled background image and thus producing a blended image.

5. A method according to claim 4, wherein the step of blending further comprises the step of combining the values of the pixels within the block of the uncompressed high-resolution bitmap image using at least one look-up table.

6. A method according to claim 4, wherein the step of downscaling the background image is done in the Discrete Cosine Transform domain.

7. A computer program, embodied in a computer-readable medium, for downscaling and blending a high-resolution compressed background image and a high-resolution compressed bitmap image, comprising:

downscaling the background image by a predetermined factor;

uncompressing the downscaled background image;

uncompressing the high-resolution bitmap image;

dividing the uncompressed high-resolution bitmap image into blocks of pixels, whereby the size of each block correspond to the size of each pixel of the downscaled background image; and

blending each of the blocks of the uncompressed high-resolution bitmap image with each of the pixels of the downscaled background image to produce a blended image.

8. (canceled)