In an arrangement wherein vertical contour enhancement is performed by subtracting a video signal between horizontal scanning lines and applying a white- or black-level signal before or after the contour (edge portion) of an image based on the result of the subtraction operation, the application of the black-level signal is selectively suppressed to diminish unattractive black borders. In another embodiment, application of the black-level signal to portions having a strong red-signal component is selectively suppressed, thereby diminishing unattractive black borders which appear at red portions of a display image. In still another embodiment, application of the black-level signal to portions where the level of an R-Y signal is high is selectively suppressed, thereby diminishing unattractive black borders which appear at red portions of a display image.
A signal processing apparatus for a solid-state imaging device in which an imaging output signal from a solid-state image sensor of an imaging section in the imaging device having a spatial offset is digitized and formed into a detail signal utilized for image enhancement by digital signal processing. More specifically, a first delay circuit having at least one delay unit which imposes a dealy time of approximately one horizontal scanning period receives a digitized green color imaging signal having the spatial offset. Signal synthesis is then performed in a first synthesis circuit so as to limit the bandwidth of the green color imaging signal in a perpendicular direction. A second delay circuit having at least one digital delay unit which imposes a delay time of approximately one horizontal scanning period receives one of a digitized red or blue color imaging signal or a combined red and blue digitized color imaging signal. Signal synthesis is then performed by a second synthesis unit so as to limit the bandwidth of the red or blue digitized color imaging signal or the combined red and blue digitized color imaging signal in the perpendicular direction. Equal amounts of selected outputs from the first and second synthesis units are summed together in a summation unit and outputted through a digital filter so as to form the horizontal detail signal.
An electronic still camera for recording stationary images comprises a light metering device for light-metering a plurality of portions of an object to be photographed and outputting a plurality of signals corresponding to the quantities of light of the portions, an image pickup device for converting the image of the object to be photographed into an image signal, a contour enhancing device provided with a plurality of selectable contour enhancement degrees and enhancing the contour of the image signal, and a selecting device for effecting calculation on the basis of the outputs from the light metering device and selecting one of the plurality of contour enhancement degrees provided in the contour enhancing device on the basis of the result of the calculation.
