1. An imaging apparatus comprising: an imaging section for imaging a subject using an imaging device to generate an image signal; and a resolution conversion section for converting a resolution of the image signal captured by said imaging section and outputting the converted image signal, wherein a plurality of embedded regions are set in an input image size for embedment of respective size-reduced images of different sizes, said resolution conversion section reduces the image inputted from said imaging section to a plurality of size-reduced images of different sizes obtained from a same source, and outputs an embedded image, comprising the plurality of size-reduced images of said subject and a dummy region that together have the same image-size as the input image, in which the plurality of size-reduced images of different sizes are embedded in the embedded regions respectively, wherein said resolution conversion section outputs the embedded image in which the plurality of size-reduced images of different sizes are embedded in the plurality of embedded regions by generating the plurality of size-reduced images of different sizes through size-reduction processing of the input image in plural stages and by sequentially outputting signals of the plurality of size-reduced images of different sizes, and wherein output of the embedded image causes output of the plurality of size-reduced images with different resolutions at the same time.