Simultaneous readout of CMOS APS imagers
View Patent ↗A new method of reading an imager is achieved. The method comprises providing an imager array comprising n rows and m columns where a pair of rows can be read during a single row access time. A first image field is completed by sequentially reading and storing pixel values of pairs of adjacent rows of the imager array. The reading begins at a first row, and the reading stops when less than three rows are unread. Thereafter pixel values of the next row are read and not stored. Thereafter pixel values of the first row of the imager array are read and not stored. A second image field is completed by sequentially reading and storing pixel values of pairs of adjacent rows. The reading begins at the second row, the reading stops when less than two rows are unread.
1. A method of reading an image field of an imager array, said method comprising:
providing an imager array comprising n rows and m columns wherein a pair of said rows can be read during a single row access time; and
completing an image field by a method comprising:
reading and storing a string of pixel values for a pair of said rows, wherein each said pair of said rows comprises one said row from the upper half of said imager array and one said row from the lower half of said imager array;
copying said pixel values for a first said row of said pair from said pixel string to a first row register in an order corresponding to said columns;
copying said pixel values for a second said row of said pair from said pixel string to a second row register in said order corresponding to said columns; and
repeating said steps of reading and storing, copying said pixel values for a first said row of said pair, and copying said pixel values for a second said row of said pair for all said rows of said imager array.
2. The method according to claim 1 further comprising the steps of:
copying said first row register to a first row display register; and
copying said second row register to a second row display register.
3. The method according to claim 2 wherein contents of said first and second row display registers are displayed on an imager reproduction device.
4. The method according to claim 1 wherein said step of repeating comprises indexing from said row pair comprising row 1 and row n to said row pair comprising row n/2 and row (n/2)+1.
5. The method according to claim 1 wherein said step of repeating comprises indexing from said row pair comprising row n/2 and row (n/2)+1 to said row pair comprising row 1 and row n.
6. The method according to claim 1 wherein said step of repeating comprises indexing from said row pair comprising row 1 and row (n/2)+1 to said row pair comprising row n/2 and row n.