| 摘要 |
PURPOSE: To allow a memory with a small capacity enough to process an image and to reduce the processing time by thinning out a sample picture element for generating a histogram required for the image processing. CONSTITUTION: Data read by a scanner section are subjected to comparison processing with a multi-value threshold level by an A/D converter and a multi-value processing signal 1 is outputted as a multi-value processing number (n). Then a sample picture element position decision means 4 decides each block sample position based on data of a sample position designation input signal 2 and provides the output of a picture element position designation signal 3. A picture element position discrimination means 5 uses the signal 1, its picture element position and the signal 3 to discriminate the picture element position of the signal 1 is a designated position or not and provides the output of a picture element position discrimination signal 7. The signal 7 is fed to a histogram generating means 6, which provides a histogram signal 8 as an output by counting up the number of frequency of a histogram with the same density as that represented by a multi-value processing image signal among density histograms generated in matching with the multi-value number (n) of the signal 1 when the signal 7 indicates the designated picture element position of the image expressed by the signal 1. |
