Abstract: Auto focus control and/or auto exposure control is carried out by using a luminance signal before gamma correction, before addition of aperture signal but after hand shake correction. Auto white balance control is carried out by using a color signal after hand shake correction. Consequently, precise auto focus control, auto exposure control and/or auto white balance control can be done. The field memory for electronic zooming and/or hand shake correction is also used as a field memory for noise reduction. Consequently, a video signal processing circuit which is inexpensive and simple can be implemented.

Abstract: A video camera includes a solid-state image sensing device, and an electric signal from the image sensing device is converted by a camera circuit into a video signal which is further converted into a digital video signal by an A/D converter. The digital video signal is stored in a field memory sequentially field by field under control of a memory control circuit. A motion detecting circuit which receives the digital video signal calculates correlative values for each of a plurality of blocks constituting a whole screen according to a representative point matching method. A microcomputer calculates motion vectors of respective blocks on the basis of correlative value data from the motion detecting circuit and an average motion vector thereof, and calculates "increase", "passing degree" and "variation". The microcomputer further evaluates a reliability of each of the blocks according to a fuzzy inference by utilizing the increase, passing degree and variation as parameters.

Abstract: Auto focus control and/or auto exposure control is carried out by using a luminance signal before gamma correction, before addition of aperture signal but after hand shake correction. Auto white balance control is carried out by using a color signal after hand shake correction. Consequently, precise auto focus control, auto exposure control and/or auto white balance control can be done. The field memory for electronic zooming and/or hand shake correction is also used as a field memory for noise reduction. Consequently, a video signal processing circuit which is inexpensive and simple can be implemented.