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Image scanning circuitry with row and column addressing for use in electronic cameras
| Details |
Inventors: Lyon, Richard F.; Turner, Richard M.; Merrill, Richard B.;
Assignee: Foveon, Inc. (Santa Clara, CA)
Primary Examiner: Couso; Jose L.
Assistant Examiner: Patel; Kanji
Attorney, Agent or Firm: Sierra Patent Group, Ltd.
A scanning circuit for use with an active pixel sensor array comprises a row-address generator configured to start at a selected row-start address, stop at a selected row-stop address, and increment row addresses by a factor K. A column-address generator is configured to start at a selected column-start address, stop at a selected column stop address, and increment column addresses by a factor K. Circuitry is coupled to the row address generator and the column address generator, for storing the row-start address, the row-stop address, the column-start address, the column-stop address and the factor K. A row decoder is coupled to the row-address generator and a column selector is coupled to the column-address generator. A plurality of row select lines are coupled to the row decoder, each one of the row select lines associated with a different row in the active pixel sensor array. A plurality of column output lines are coupled to the column selector, each one of the column output lines associated with a different column in the active pixel sensor array. |
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DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT Those of ordinary skill in the art will realize that the following description of the present invention is illustrative only and not in any way limiting.
Other embodiments of the invention will readily suggest themselves to such skilled persons.
Referring first to FIG.
1, a block diagram of an electronic camera 10 employing the scanning circuitry of the present invention is shown.
Electronic camera 10 includes a pixel sensor array 12, such as an active pixel sensor array.
According to the present invention, pixel sensor array 12 is controlled by a flexible address generator circuit 14.
Flexible address generator circuit 14 is controlled by a control circuit 16 that provides all of the signals necessary to control reading pixel data out of the array 12.
The flexible address generator circuit 14 and control circuit 16 may be used to read full high-resolution image data out of the pixel sensor array 12 and store that data in storage system 18.
The pixel sensor array 12 is a high-resolution active pixel sensor array suitable for use in digital still or video cameras.
Such active pixel sensor arrays are generally displayed onto a viewscreen so that the user can view and adjust the image.
The flexible address generator circuit 14 and control circuit 16 may also be integrated on the same silicon as sensor array 12 and may be used to provide pixel data to a viewfinder display having a resolution lower than that of the full image produced from the pixel sensor array 12.
Referring now to FIG.
2, a block diagram shows illustrative scanning circuitry comprising the flexible address generator circuitry 14 and control circuitry 16 of FIG.
1 in more detail.
The main components of a preferred embodiment of the scanning circuitry are shown in FIG.
2.
The active pixel sensor array 12 has N rows and M columns of pixel sensors.
The active pixel sensor array 12 is connected to the rest of the scanning circuitry components through the row select lines 30, and the column output lines 32
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