Parallel processing with subsampling/spreading circuitry and dat

Details Parallel processing with subsampling/spreading circuitry and dat Parallel processing with subsampling/spreading circuitry and dat

1992-12-18

1995-07-25

Coleman, Eric

Image analysis

Histogram processing

For setting a threshold

395100, 382293, 358448, 3642306, 364260, 3642606, 364DIG1, G06F 1516, G06F 1562

Patent

active

054370450

ABSTRACT:
A parallel processor includes processing units, data transfer circuitry, subsampling/spreading circuitry, and control circuitry. The subsampling/spreading circuitry can receive an item of data defining an image segment and use it to obtain another item of data defining the same image segment with a different amount of data. For example, a subsampling transceiver can obtain less data, such as one-half or 1/N as much, and a spreading transceiver can obtain more data, such as twice or N times as much. The data transfer circuitry can connect the processing units to the subsampling/spreading circuitry so that data can be transferred from any processing unit to the subsampling/spreading circuitry and vice versa. The processing units can be grouped and the data transfer circuitry can include N buses, with one processing unit in each group connected to each bus. The data transfer circuitry can also include a common bus and a holding register on the common bus. During subsampling, the N buses can transfer data to the subsampling circuitry, from which the resulting data goes to the common bus and is loaded into the holding register. In the next cycle, the data from the holding register is transferred back to one of the processing units. During spreading, data from one processing unit can be transferred to the holding register. In the next cycle, the data can be transferred to the spreading circuitry and then through the N buses to a group of processing units. During spreading, additional pixels can have a constant value or can take the value of one of the pixels between which they are added.

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