 of the i-th camera in the horizontal direction. The value of exponent principal_point_x[i] shall be in the range of 0 to 62, inclusive. The value 63 is reserved for future use by ITU-TISO/IEC.Decoders shall treat the value 63 as indicating an unspecified principal point. mantissa_principal_point_x[i] specifies the mantissa part of the principal point of the i-th camera in the horizontal direction. The length of the mantissa_principal_point_x[i] syntax element in units of bits is variable and is determined as follows: If exponent_principal_point_x[i]==0 the length is Max( prec_principal_point - 1 Rec. ITU-T H.264 (01/2012) Otherwise (0 < exponent_principal_point_x[i] 63), the length is Max( 0, exponent_principal_point_x[i]+ prec_principal_point-31). sign_principal_point_y[i]equal to 0 indicates that the sign of the principal point of the i-th camera in the vertical direction is positive. sign_principal_point_y[ i ] equal to 1 indicates that the sign is negative. exponent_principal_point_y[i]specifies the exponent part of the principal point of the i-th camera in the vertical direction. The value of exponent_principal_point_y[i) shall be in the range of 0 to 62, inclusive. The value 63 is reserved for future use by TU-TISO/IEC.Decoders shall treat the value 63 as indicating an unspecified principal point. mantissa principal specifies the mantissa part of the principal point of the i-th camera in the vertical direction. The length of the emantissa_principal_point_y[i) syntax element in units of bits is variable and is determined as follows: If kponent_principal_point_y[i]==0,the length is Max( 0, prec_principal_poin - 30). Otherwise (0<exponent_principal_point_y[i]< 63), the length is Max( 0, exponent_principal_point_y[i]+ prec_principal_point-31). sign_skew_factor| equal to 0 indicates that the sign of the skew factor of the i-th camera is positive. sign_skew_factor[i equal to 1 indicates that the sign is negative. exponent_skew_factor[i specifies the exponent part of the skew factor of the i-th camera. The value 