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Apparatus and method for extracting a portion of an image
| Details |
Inventors: Kajimoto, Masato; Murase, Hirofumi;
Assignee: Sony Corporation (Tokyo, JP)
Primary Examiner: Hjerpe; Richard A.
Assistant Examiner: Nguyen; Francis
Attorney, Agent or Firm: Frommer Lawrence & Haug, LLP., Frommer; William S., Smid; Dennis M.
An apparatus and method for extracting a desired portion of an image represented by compressed data. The compressed data is expanded in an expanding circuit and outputted therefrom in accordance with clock pulses. Such clock pulses, or data transfers or addresses associated therewith, are counted so as to determine the position of the data. The determined position of the data is compared to the desired portion so as to determine whether the data is within the desired portion. If the data is determined to be within the desired portion, such data is stored in an image memory. As a result, such extraction may be performed without utilizing an additional memory for temporarily storing the expanded data. |
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DETAILED DESCRIPTION An object of the present invention is to provide a technique for extracting or cutting out a desired portion of an original image represented by compressed data without using an additional memory for storing image data expanded from the compression data.
In accordance with an aspect of the present invention, a video apparatus is provided which comprises an image expanding device for expanding compressed image data; an image memory for storing expanded image data; a counter for counting a number of expanded image data transfers from the image expanding device; a position computing device responsive to an output of the counter for determining positions of the image data from the image expanding device; a device for designating a part of the image data for display; a device for comparing a respective position of the image data from the image expanding device with positions of image data within the part of the image data designated for display; and a memory control device responsive to an output of the comparing device for controlling the image memory.
In accordance with another aspect of the present invention, a video memory controller is provided for controlling a video memory so as to extract a part of an original picture.
The controller comprises a device for dividing a compressed picture into a plurality of blocks; a device for expanding each block to an original picture; a counting device for counting each block address of the plurality of blocks; a selecting device for selecting the part of the picture to be extracted; a comparison device for comparing the address from the counting device and the address corresponding to the part selected by the selecting device; and a controlling device for controlling a write operation of the video memory in accordance with the result of the comparison device.
Thus, in accordance with the present invention, to extract a portion of an original image expressed in a compressed form, the compressed image data is expanded.
A current or respective position (or address) of the original image may be calculated from a counted number of expanded data (or addresses) to determine whether the respective position (address) of the original image is in the portion of the image to be extracted
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