发明名称 |
THRESHOLD DEVICE FOR DISTINGUISHING BETWEEN BLACK AND WHITE ON A DOCUMENT AND FACSIMILE TRANSMITTER COMPRISING SUCH A DEVICE |
摘要 |
The threshold device comprises a comparator for comparing the input signal with a threshold voltage and delivering an output signal having a first level when the level of the input signal is a white level and a second level when the level of the input signal is a black level. Storage means memorize the value of the level of the input signal when the level of the output signal of the comparator corresponds to a white level. Said storage means deliver a voltage which is representative of a fraction of the value of the stored input signal level and which constitutes the threshold voltage. |
申请公布号 |
DE2964961(D1) |
申请公布日期 |
1983.04.07 |
申请号 |
DE19792964961 |
申请日期 |
1979.08.28 |
申请人 |
THOMSON-CSF |
发明人 |
BUTIN, HENRI |
分类号 |
H03K5/08;G06T1/00;H04N1/403;(IPC1-7):H04N1/40 |
主分类号 |
H03K5/08 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|