H - Electricity – 04 – N
Patent
H - Electricity
04
N
354/68
H04N 1/417 (2006.01)
Patent
CA 1291822
ABSTRACT OF THE DISCLOSURE An apparatus and method embodied therein, for processing image data wherein the apparatus comprises: a data input/output circuit for receiving and outputting binary image data and compressed code data; an encoding circuit including (i) a first detecting circuit for detecting transition points where the value of an input binary image data changes from one to another, (ii) an up-counter for generating addresses of the transition points, and (iii) a second detecting circuit for detecting if the value of the input binary image data does not change during a predetermined period so as to control the up-counter so as to count up faster than at a normal speed. The input image data is encoded into the output compressed code data by using the correlation between a preceding reference line and an encoding line based on the addresses of the transition points. The apparatus further comprises a decoding circuit including a down-counter for presetting a run length of the input compressed code data and a third detecting circuit for detecting if the run length of the input compressed code data exceeds a predetermined number so as to control the down-counter so as to count down faster than at a normal speed, whereby the input compressed code data is decoded into the output binary image data. A couple of data memories are controlled by a control circuit in a manner such that while one of the data memories is in a write status, the other is in a read status and the write and read statuses are alternately changed for every line to read out or write the addresses of the transition points of a preceding line from or into one of the data memories and the addresses of the transition points of an encoding or decoding line from or into the other memory. A microprocessor, including program memories, selectively causes the encoding and decoding so that the data input/output circuit selectively receives or outputs binary image data and the compressed code data.
507581
Doi Tetsuo
Funabashi Takeshi
Gowling Lafleur Henderson Llp
Sony Corporation
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