Abstract: In the image input apparatus of the present invention, a control unit included therein performs control so as to stop an image reading unit in a case where an amount of power stored in a power storage unit becomes less than or equal to a first threshold value, performs control so as to charge the power storage unit with a predetermined amount of power, performs control so as to return the reading unit up to a predetermined return position in a direction opposite to an image reading direction, and after returning the image reading unit up to the predetermined return position, performs control so as to move the image reading unit in the reading direction in a case where an amount of power is larger than a second threshold value and otherwise move the image reading unit in the reading direction after charging the power storage unit with the power.

Abstract: In the image input apparatus of the present invention, a control unit included therein performs control so as to stop an image reading unit in a case where an amount of power stored in a power storage unit becomes less than or equal to a first threshold value, performs control so as to charge the power storage unit with a predetermined amount of power, performs control so as to return the reading unit up to a predetermined return position in a direction opposite to an image reading direction, and after returning the image reading unit up to the predetermined return position, performs control so as to move the image reading unit in the reading direction in a case where an amount of power is larger than a second threshold value and otherwise move the image reading unit in the reading direction after charging the power storage unit with the power.

Abstract: A method of the invention includes inputting at least two or more image signals, and superimposing at least two or more image signals among the plurality of image signals as a child screen on the same screen. In doing so, image compression ratio is controlled using coordinates information of the child screen region superimposed. That is, the compression ratio of the child region is made different from that in the other image regions to have an appropriate image compression ratio of the child screen superimposed.

Abstract: A video data transmission arrangement writes video data processed for transmission into a detachable data card. The video data stored in the data card is converted into time-continuous video signals which are processed to enable confirmation of the transmitted video data at the transmitter. Video data can be stored in a video memory and updated at regular time intervals to provide backup and a processor operates to freeze the video data in the video memory upon operation of a freeze switch. The video data stored in the video memory is compressed at each update or when a freeze operation is performed. The compressed video data is stored in a random access memory that is continuously supplied with power from a battery. A compression/expansion circuit reads and expands the compressed video data from the random access memory and delivers the expanded video data to the video memory.