| 摘要 |
A television pickup arrangement comprises a solid state pickup device which is read by field transfer. The pickup produces a picture signal which on display shows information smear. It is known to perform a correction by obtaining signal smear information from under an opaque, masking strip on the picture pickup portion of the pickup device. The smear picture signal is stored once in every field period in a memory device which is repeatedly readable at line frequency. The smear picture signal is subtracted from the picture signal to be corrected. If there is movement in the scene in the horizontal direction, an unacceptable smear is, however, still observable. According to the invention, a correction may be effected, using a second memory device. The second memory device may be used for performing a signal averaging operation over several field periods or for storing a smear picture signal so that different smear corrections can be effected in the upper and lower picture halves. In both cases the smear is reduced to an acceptable level.
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