An image processor for forming an easy-to-see image by broadening the significant
band of image data received from a logarithmic (LOG) image sensor to enhance the
contrast of the image. The LOG image sensor generates an output in response to
the light, with the output voltage being a logarithm of the intensity of the light
received. The image processor extracts only those pixel data in the significant
band out the image data received from the LOG image sensor in accordance with the
distribution of the voltage of the signals. In order to form an easy-to-see image,
the processor expands the voltage band, assuming that the output voltage has a
linear dependence on the intensity of light received by the LOG image sensor. The
resultant image has an wider band in voltage, which enhances the contrast, and
hence the visibility, of the image.
