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Memory conserving and compression technique-compatible image rotation system
| Details |
Inventors: Goldberg, Jonathan A.; Besen, Peter; Shulsinger, Donald;
Assignee: Oak Technology, Inc. (Sunnyvale, CA)
Primary Examiner: Homere; Jean R.
Assistant Examiner:
Attorney, Agent or Firm: Testa, Hurwitz and Thibeault
An image processing system for performing rotation of an image reduces the size of the memory buffer needed for rotation while ensuring that rotation is compatible with a variety of compression techniques. A processing module determines whether a memory buffer sized to accommodate the entire image should be used, or whether a smaller memory buffer can be used to rotate smaller sized image sections. When the image data fills the selected memory buffer, rotation processing of the image data can then commence, regardless of whether the entire input image has been received by the processing module. A rotation module operates on incoming image data stored in the memory buffer, causing rotation of the image data and transfer to an encoder/decoder module where the image data is compressed in accordance with one or more compression techniques. After compression, the image data is stored in random memory locations. When the rotated image is requested by the output device, the sections are retrieved, decompressed and reconstructed in accordance with appropriate compression techniques. |
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DETAILED DESCRIPTION The present invention relates to an image processing system and method for performing rotation of an image.
The image processing system independently rotates, compresses and stores image sections, resulting in a conservation of memory and an increased compatibility with differing compression techniques.
In one embodiment, the present invention comprises an image processing module and a memory module having one or more buffers of reduced size.
The image processing module comprises a processing module, an encoder/decoder module and a rotator module.
In one embodiment, the processing module determines whether a memory buffer sized to accommodate the entire image should be used, or whether a smaller memory buffer should be used to rotate smaller sized image sections.
In the event that the image is of a certain size and division into smaller sections is desirable, rotation processing commences when an image section fills the selected memory buffer.
The rotation module operates on each image section independently, such that each section is rotated by 90.
degree.
and transferred to an encoder/decoder module where each section is compressed in accordance with one or more compression techniques.
After compression, each of the compressed sections are stored in separate, and random memory locations.
The random memory locations can further be memory locations that are not adjacent, that is, non-contiguous locations in the memory module.
When the rotated image is requested by the output device, one or more of the sections are retrieved, decompressed and reconstructed in accordance with appropriate compression techniques.
The system and method of the present invention thus eliminates the need to use a large memory buffer to rotate and compress the entire image.
Additionally, the system and method of the present invention further eliminates the need to store the rotated and compressed image sections in contiguous locations in memory for proper reconstruction thereof.
Moreover, as the sections of the image can be rotated and compressed independently, the system and method of the present invention allows differing compression techniques to be used on different sections of the image
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