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Obtaining access to a two-dimensional portion of a digital picture signal
| Details |
Inventors: Virtue, Peter J.; Keating, Stephen M.; Hedley, David J.;
Assignee: Sony Corporation (Tokyo, JP)
Primary Examiner: Moore; David K.
Assistant Examiner: Jung; Yon
Attorney, Agent or Firm:
Access to a two-dimensional (2-D) portion of a digital picture signal, the signal being made of a plurality of digital words representing respective pixels (P) when, when arranged in a 2-D array, make up the picture, is achieved as follows. The words are allocated into groups such that the pixels (P) represented by the words of each group make up a 2-D area (T0, T1, etc.) of the picture having a shape and size which is the same for all of the groups, the shape being such that the areas tessellate with one another to constitute at least part of the picture. Each word is stored in one of a plurality of memories (M0 to M15), the number of which is equal to the number of pixels (P) in the 2-D area (T0, T1, etc.), such that, for each pixel position in the area, the words from all of the groups representing the pixels having that pixel position in the area are stored in a respective one of the memories. Then, a set of the stored words which represent a set of pixels are read in parallel. The pixels of the set are so positioned relative to one another as to constitute at least some of the pixels (P0 to P15) of a 2-D portion of the picture which is of the same size and shape as the above-mentioned 2-D area (T0, T1, etc.) whereby, even if the pixels of the set are located in different ones of the 2-D areas, the words representing the pixels (P0 to P15) of the set are each stored in a respective different one of the memories (M0 to M15) so that they can be read in parallel. |
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DETAILED DESCRIPTION The invention provides a method of obtaining access to a two-dimensional portion of a digital picture signal, which signal comprises a plurality of digital words representing respective pixels which, when arranged in a two-dimensional array, make up the picture.
The method comprises allocating the digital words of the signal into groups such that the pixels represented by the words of each group make up a two-dimensional area of the picture having a shape and size which is the same for all of the groups, such shape being such that the above-mentioned areas of the same shape and size tessellate with one another to constitute at least part of the picture.
Each digital word is stored in one of a plurality of memory devices, the number of memory devices being equal to the number of pixels in the above-mentioned area, such that, for each pixel position in that area, the digital words from all of the groups representing the pixels having that pixel position in the area are stored in a respective one of the memory devices.
Then, a set of the stored digital words which represent a set of pixels are read in parallel, the pixels of the set being so positioned relative to one another as to constitute at least some of the pixels of a two-dimensional portion of the picture which is of the same shape and size as said two-dimensional area of the picture whereby, even if the pixels of the set are located in different ones of said areas, the words representing the pixels of the set are each stored in a respective different one of the memory devices so that they can in fact be read in parallel.
Thus, parallel access can readily be achieved.
In many applications, the set of pixels consists of all of the pixels of the said two-dimensional portion of the picture.
That is to say, all of the pixels of said portion are read in parallel.
It is, however, possible for the set of pixels to comprise some only of the pixels of said portion, for example selected mutually spaced ones of the pixels of the portion or adjacent ones of the pixels of the portion that make up a two-dimensional section of the picture that falls wholly within the portion
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I/O Systems 
