| 摘要 |
A field detection apparatus and method for determining, from an image signal of consecutive frames, each frame including two fields, whether a given field is a repeat of the prior field that precedes two fields ahead of the given field. Based on a predetermined detection criterion, a repeat field which is identical to the prior field that precedes two fields ahead of the repeat field is detected, and the predetermined detection criterion is changed between when the detection period for the repeat field applied to the image signal is stable and when the detection period for the repeat field applied to the image signal is unstable. With this arrangement, the repeat field is accurately detected. Also disclosed are an image coding apparatus and method for coding an image signal of consecutive frames, each frame including two fields. The repeat field which is identical to the prior field that precedes two fields ahead of the repeat field is detected, the repeat field or the prior field that precedes two fields ahead of the repeat field is selected, both the selected field and the prior field that precedes one field ahead of the repeat field are coded as one frame, and a coded signal is thus generated. With this arrangement, the efficiency of coding is heightened.
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