Digital Image Processing

2. A sampled (but not quantized) image, whose brightness before quantization, in each spatial position, can take values in the range [0mV;250mV], has the linear histogram of its brightness represented (approximately) in Fig. 2.a). After the quantization, the histogram of the resulting digital image is the one in Fig. 2.b). Then, most likely, the quantizer that was used is: a) an 8 bit uniform quantizer; b) a 2 bit optimal quantizer; c) a 4 bit optimal quantizer; d) a 2 bit uniform quantizer.