1. In a count correction apparatus for a system classifies classified objects by type to provide a signal readout of the count of the objects of each type, and further in which system there is a bias or error in the count of objects of each type because of limitations in the classifying, the average systematic errors being expressible by the matrix relation ##EQU3## and being correctible according to the inverse matrix relation ##EQU4## where the matrix with elements q.sub.ij is the inverse of the matrix with elements p.sub.ij, where n.sub.1, n.sub.2, n.sub.m is the actual number of objects of each type, v.sub.1, v.sub.2, v.sub.m is the machine count, and u.sub.1, u.sub.2, u.sub.m is the improved count, the improvement comprising: count correction means connected to receive the signal count of objects by type comprising a network of scaling amplifiers and summing amplifiers, the number of summing amplifiers being equal to the number (m) of types of objects being counted, the number of matrix elements in the correction matrix being equal to the square of the number of types of objects being counted, and the number of scaling amplifiers S.sub.11, S.sub.12, ---, S.sub.1m ; S.sub.21, S.sub.22, ---, S.sub.2m ; ---; S.sub.m1, S.sub.m2, ---, S.sub.mm being at least equal to the number of non-zero elements of the correction matrix, said scaling amplifiers S.sub.11, S.sub.12, ---, S.sub.1m each connected to receive a signal the magnitude of which is a function of the count of one of said types, said scaling amplifiers S.sub.21, S.sub.22, ---, S.sub.2m each connected to receive a signal the magnitude of which is a function of the count of a second of said types, the remaining scaling amplifiers being connected in like manner to receive the count of other types, each of said scaling amplifiers corresponding in gain and sign to a different element of said correction matrix, the outputs of said scaling amplifiers S.sub.11, S.sub.21, -- -, S.sub.m1 being connected to sum at one of said summing amplifiers, the outputs of said scaling amplifiers S.sub.12, S.sub.22, ---, S.sub.m2 being connected to sum at the second summing amplifier, the remaining scaling amplifiers being connected in like manner to other summing amplifiers, whereby the outputs of said summing amplifiers provide, respectively, an improved accuracy count signal of each type of object.