Camera apparatus

专利名称：Camera apparatus发明人：Koji Takahashi,Teruo Hieda申请号：US07/602918申请日：19901023公开号：US05293239A公开日：19940308

摘要：A camera apparatus has an image sensing part arranged to successively outputfor every field or frame a first image signal obtained for a predetermined exposureperiod of time and a second image signal obtained for a very short exposure period oftime, a noise extracting circuit arranged to extract a fixed pattern noise from the secondimage signal, and a subtraction circuit arranged to subtract, under a predeterminedweighting condition, the fixed pattern noise extracted by the noise extracting circuit firstimage signal. Another camera apparatus has an image sensing part capable of adjustingan exposure period of time, a control circuit arranged to change the exposure period oftime of the image sensing part to a high shutter-speed photography at intervals of apredetermined number of taken pictures, an interpolation circuit arranged to interpolatean image signal obtained by the high shutter-speed photography by using an imagesignal obtained for a predetermined exposure period of time, a noise extracting circuitarranged to extract a fixed pattern noise from the image signal obtained by the highshutter- speed photography, and a subtraction circuit arranged to subtract, under apredetermined weighting condition, the fixed pattern noise extracted by the noiseextracting circuit from the image signal obtained for the predetermined exposure periodof time by the image sensing part or from an interpolated image signal obtained by the

interpolation circuit.

申请人：CANON KABUSHIKI KAISHA

代理机构：Robin, Blecker, Daley & Driscoll

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