초록 ▼

Methods and apparatus for compensating for charge transfer inefficiency in imaging and other variable length charge transfer devices are disclosed. In accordance with the method a recursive filter is used to compensate for the transfer inefficiency of the device with the coefficients of the recursiv

Methods and apparatus for compensating for charge transfer inefficiency in imaging and other variable length charge transfer devices are disclosed. In accordance with the method a recursive filter is used to compensate for the transfer inefficiency of the device with the coefficients of the recursive filter being dependent upon the pixel position and the inefficiency per transfer, or more particularly upon the inefficiency per transfer and the number of transfers required to transfer from the pixel position to the output of the charge transfer device. In addition, a variable gain control is used to restore the amplitude of the output signal dependent upon the pixel position and inefficiency per transfer. Substantial compensation is achieved utilizing recursive filter coefficients linearly increasing with the number of transfers required, with an automatic gain control amplifier also linearly increasing in gain proportional to the number of transfers required to restore signal amplitude. Test results and apparatus for practicing the invention are also disclosed, as are other compensation techniques.

대표청구항 ▼

A method of compensating for charge transfer inefficiency in charge transfer devices having varying numbers of discrete charge transfers to sequentially shift each signal from its original storage cell to the device output comprising the steps of: (a) for each device output signal, preserving a sign

A method of compensating for charge transfer inefficiency in charge transfer devices having varying numbers of discrete charge transfers to sequentially shift each signal from its original storage cell to the device output comprising the steps of: (a) for each device output signal, preserving a signal responsive to that output signal for at least one subsequent transfer; and (b) compensating the subsequent output signal after the subsequent transfer by combining the preserved signal with the subsequent device output signal in a varying amount, the varying amount being dependent upon the approximate number of transfers that were required for the preserved signal to shift from its origin in the device to the output thereof.