A signal processing device, comprising: a first pixel thinning control unit configured to thin out every other pair of two neighboring pixel samples of each line from N consecutive frames of a first video signal comprising: an m×n number of pixel samples per frame, m indicating m samples and n indicating n lines, wherein m and n are positive integers; a frame rate in the range of (48P-60P)×N, wherein N is an integer of 2 or more; a ratio r:g:b of a red signal r, a green signal g, and a blue signal b in the case of a predetermined signal transmission scheme; and a 10-bit or 12-bit signal, in which the number of pixel samples per frame exceeds the number of pixel samples specified in an HD format at intervals of 2N lines, wherein the first pixel thinning control unit is configured to map the thinned every other pair of two neighboring pixel samples to first to 4N-th sub images comprising: an m'×n' number of pixel samples, m' indicating m' samples and n' indicating n' lines, wherein m' and n' are positive integers; a frame rate in the range of 48P-60P; a ratio r':g':b' of a red signal r', a green signal g', and a blue signal b' in the case of a predetermined signal transmission scheme; and a 10-bit or 12-bit signal; and characterized in that the first pixel thinning control unit is configured to arrange a vertical blanking region between two of N regions in which pixel samples of respective frames of the first video signal are mapped in each sub image. an m×n number of pixel samples per frame, m indicating m samples and n indicating n lines, wherein m and n are positive integers; a frame rate in the range of (48P-60P)×N, wherein N is an integer of 2 or more; a ratio r:g:b of a red signal r, a green signal g, and a blue signal b in the case of a predetermined signal transmission scheme; and a 10-bit or 12-bit signal, in which the number of pixel samples per frame exceeds the number of pixel samples specified in an HD format at intervals of 2N lines, wherein the first pixel thinning control unit is configured to map the thinned every other pair of two neighboring pixel samples to first to 4N-th sub images comprising: an m'×n' number of pixel samples, m' indicating m' samples and n' indicating n' lines, wherein m' and n' are positive integers; a frame rate in the range of 48P-60P; a ratio r':g':b' of a red signal r', a green signal g', and a blue signal b' in the case of a predetermined signal transmission scheme; and a 10-bit or 12-bit signal; and characterized in that the first pixel thinning control unit is configured to arrange a vertical blanking region between two of N regions in which pixel samples of respective frames of the first video signal are mapped in each sub image. an m'×n' number of pixel samples, m' indicating m' samples and n' indicating n' lines, wherein m' and n' are positive integers; a frame rate in the range of 48P-60P; a ratio r':g':b' of a red signal r', a green signal g', and a blue signal b' in the case of a predetermined signal transmission scheme; and a 10-bit or 12-bit signal; and characterized in that the first pixel thinning control unit is configured to arrange a vertical blanking region between two of N regions in which pixel samples of respective frames of the first video signal are mapped in each sub image.