US 12,155,845 B2
Decoding images compressed using MIP map compression
Rostam King, Hertfordshire (GB)
Assigned to Imagination Technologies Limited, Kings Langley (GB)
Filed by Imagination Technologies Limited, Kings Langley (GB)
Filed on Nov. 13, 2023, as Appl. No. 18/389,002.
Application 18/389,002 is a division of application No. 17/665,764, filed on Feb. 7, 2022, granted, now 11,818,368, issued on Nov. 14, 2023.
Application 16/422,545 is a division of application No. 15/651,033, filed on Jul. 17, 2017, granted, now 10,349,061, issued on Jul. 9, 2019.
Application 17/665,764 is a continuation of application No. 16/855,699, filed on Apr. 22, 2020, granted, now 11,284,090, issued on Mar. 22, 2022.
Application 16/855,699 is a continuation of application No. 16/422,545, filed on May 24, 2019, granted, now 10,674,162, issued on Jun. 2, 2020.
Claims priority of application No. 1612403 (GB), filed on Jul. 18, 2016.
Prior Publication US 2024/0080461 A1, Mar. 7, 2024
Int. Cl. H04N 19/17 (2014.01); G06T 7/00 (2017.01); G06T 9/00 (2006.01); H04N 19/34 (2014.01); H04N 19/423 (2014.01); H04N 19/59 (2014.01); H04N 19/124 (2014.01); H04N 19/172 (2014.01); H04N 19/82 (2014.01)
CPC H04N 19/17 (2014.11) [G06T 7/97 (2017.01); G06T 9/00 (2013.01); G06T 9/008 (2013.01); H04N 19/34 (2014.11); H04N 19/423 (2014.11); H04N 19/59 (2014.11); H04N 19/124 (2014.11); H04N 19/172 (2014.11); H04N 19/82 (2014.11)] 20 Claims
OG exemplary drawing
 
1. A decoder unit configured to sample compressed image data, the compressed image data comprising interleaved blocks of data encoding a first image and blocks of data encoding differences between the first image and a second image, wherein the second image is twice the width and the height of the first image, the decoder unit comprising:
a difference decoder arranged to decode a fetched encoded sub-block of the differences between the first and second images and output a difference quad and a prediction value for a pixel; and
a filter sub-unit arranged to generate a reconstruction of the image at a sample position using decoded blocks of the first image, the difference quad and the prediction value.