Abstract: A motion vector detecting unit detects a motion vector of each block in a shot image, which is divided into a plurality of blocks, during an optical zooming operation. A linear function calculating unit calculates for each block a linear function that represents a straight line, the slope of which is the same as that of a line passing through the center of the shot image and a representative point and which passes through a vector detection point. A hand-movement motion vector calculating unit selects at least two blocks that have the calculated linear functions, the slope of which are different from each other, and obtains an intersection of graphs of the linear functions of the selected blocks so as to calculate a motion vector caused by hand movement. A hand-movement correcting unit corrects the hand movement in the shot image based on the calculated motion vector caused by the hand movement.

Abstract: An authenticating device generates authentication base data and verification data. The authenticating device embeds the verification data in the authentication base data to generate authentication data. The authenticating device transmits the authentication data to a device to be authenticated. In the device to be authenticated, the verification data is extracted from the transmitted authentication data, and verification reply data is generated on the basis of the extracted verification data. The device to be authenticated generates reply base data, and embeds the verification reply data in the reply base data to generate authentication reply data. The device to be authenticated transmits the authentication reply data to the authenticating device. The authenticating device extracts the verification reply data from the transmitted authentication reply data.

Abstract: A motion vector detecting unit detects a motion vector of each block in a shot image, which is divided into a plurality of blocks, during an optical zooming operation. A linear function calculating unit calculates for each block a linear function that represents a straight line, the slope of which is the same as that of a line passing through the center of the shot image and a representative point and which passes through a vector detection point. A hand-movement motion vector calculating unit selects at least two blocks that have the calculated linear functions, the slope of which are different from each other, and obtains an intersection of graphs of the linear functions of the selected blocks so as to calculate a motion vector caused by hand movement. A hand-movement correcting unit corrects the hand movement in the shot image based on the calculated motion vector caused by the hand movement.

Abstract: An authenticating device generates authentication base data and verification data. The authenticating device embeds the verification data in the authentication base data to generate authentication data. The authenticating device transmits the authentication data to a device to be authenticated. In the device to be authenticated, the verification data is extracted from the transmitted authentication data, and verification reply data is generated on the basis of the extracted verification data. The device to be authenticated generates reply base data, and embeds the verification reply data in the reply base data to generate authentication reply data. The device to be authenticated transmits the authentication reply data to the authenticating device. The authenticating device extracts the verification reply data from the transmitted authentication reply data.

Abstract: First AV data result from a first encoding procedure. Second AV data result from a second encoding procedure. A first switch selects one from the first AV data and the second AV data. A second switch selects one from the AV data selected by the first switch and fixed-pattern AV data. An outputting device operates for outputting the AV data selected by the second switch. A type of encoding about the AV data outputted by the outputting device is designated among different types corresponding to the first and second encoding procedures respectively. The second switch is controlled to select the AV data selected by the first switch when the encoding procedure related to the AV data selected by the first switch corresponds to the designated encoding type, and is controlled to select the fixed-pattern AV data when the encoding procedure does not correspond to the designated encoding type.

Abstract: A digital camera has a detachable recording medium of either a first type into and from which data can be written and erased a plurality of times or a second type into which data can be written only once. A recording switch arrangement has a first-stage switch and a second-stage switch. In cases where the recording medium is of the first type, still-picture data are written into the recording medium when the first-stage switch is actuated. In cases where the recording medium is of the second type, data representative of a still picture are captured and the still picture represented by the captured data is indicated as a preview picture when the first-stage switch is actuated. Then, the captured data are written into the recording medium provided that the second-stage switch is actuated while the first-stage switch remains actuated.