Image generation

摘要

A method of generating an image comprises receiving a signal over a USB interface comprising encoded display data for one or more rectangular group of pixel tiles within an image and position data for the or each group of pixel tiles. The coefficients are obtained from the encoded display data, maybe by converting variable bit length fields into AC coefficients and an inverse Haar transform performed on them to generate pixel data for each rectangular group of pixel tiles. A frame buffer, which may be part of the display, is then updated with the generated pixel data ready for output to the display device. Copy protection may also be incorporated using AES negotiated over HDPC.

主权项

1. A method of generating an image comprising:
maintaining, at a display control device, a frame buffer having display data for an entire image, the display data comprising pixel data for each pixel of the image; receiving a signal over a general purpose data connection at the display control device, the signal comprising encoded display data for one or more rectangular groups of pixel tiles within the image, the display data comprising display data for less than the whole of the image, and position data indicating a position of the or each rectangular group of pixel tiles within the image, the display data being encoded using a Haar transform, obtaining a coefficient for the or each rectangular group of pixel tiles from the encoded display data, performing an inverse Haar transform on the obtained coefficients to generate pixel data for the or each rectangular group of pixel tiles, updating the frame buffer with the generated pixel data for the or each rectangular group of pixel tiles according to the position data for the or each rectangular group of pixel tiles, whereby the one or more groups of rectangular groups of pixel tiles of display data provide a partial update of the image, and outputting at least a portion of the frame buffer to a display over a display-specific data standard connection.