| 摘要 |
An apparatus for storing multi-bit pixel data comprises a random access memory, for storing a plurality of pixels at each addressable memory location, the memory having one write enable and one data input for each bit of each pixel at a currently addressed memory location. Means are provided to couple each line of a data bus to the write enable inputs associated with corresponding bits of each addressed pixel and to place a common bit, in a selected state, on every data input assosciated with a corresponding bit of each currently addressed pixel, thereby permitting a processor to rewrite the addressed pixels with a selected pixel value, provided the write enables of each pixel are activated by an appropriate bit on the associated data bus line, and thereby permitting a processor to write pixel data to the memory using only one bit per pixel on the data bus. The apparatus also comprises means to generate a data word, each bit in said data word corresponding to one pixel at the currently addressed memory location, the state of each bit depending on whether the corresponding pixel state meets selected criteria, the data word being selectively applied to the data bus.
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