Abstract: This invention discloses a method for data transfer between a host memory and a flash memory module through direct memory access (DMA), and a related data-transfer subsystem. In one embodiment, the subsystem comprises a DMA controller, a flash-memory controller, a data buffer for buffering data transferred between the DMA controller and the flash-memory controller, and a status-register group for storing a current status of the data buffer. The DMA controller and the flash-memory controller are configured such that both of them are allowed to update the current status and to detect a change of the current status during the data transfer, so that a substantial part of the data transfer's process is executed through direct interaction between the DMA controller and the flash-memory controller without involving a central processing unit. The subsystem may further comprise a command storing unit for storing command packages for execution by the flash-memory controller.

Abstract: A process and system to transform a digital photograph of a text document into a scan-quality image is disclosed. By extracting the document text from the image, and analyzing visual clues from the text, a grid is constructed over the image representing the distortions in the image. Transforming the image to straighten this grid removes distortions introduced by the camera image-capture process. Variations in lighting, the extraction of text line information, and the modeling of curved lines in the image may be corrected.

Abstract: This invention discloses a method for data transfer between a host memory and a flash memory module through direct memory access (DMA), and a related data-transfer subsystem. In one embodiment, the subsystem comprises a DMA controller, a flash-memory controller, a data buffer for buffering data transferred between the DMA controller and the flash-memory controller, and a status-register group for storing a current status of the data buffer. The DMA controller and the flash-memory controller are configured such that both of them are allowed to update the current status and to detect a change of the current status during the data transfer, so that a substantial part of the data transfer's process is executed through direct interaction between the DMA controller and the flash-memory controller without involving a central processing unit. The subsystem may further comprise a command storing unit for storing command packages for execution by the flash-memory controller.

Abstract: A process and system to transform a digital photograph of a text document into a scan-quality image is disclosed. By extracting the document text from the image, and analyzing visual clues from the text, a grid is constructed over the image representing the distortions in the image. Transforming the image to straighten this grid removes distortions introduced by the camera image-capture process. Variations in lighting, the extraction of text line information, and the modeling of curved lines in the image may be corrected.