Image encoder and decoder

摘要: PURPOSE: To optimize a data quantity obtained by compressing/encoding image and to optimally decode encoded selectively switching plural kinds of variable length encoding tables statistically in advance accordance with the quantity. CONSTITUTION: Three kind (40b, 41b 42b for brightness 40c, 41c 42c color difference) are control part 4 connected parallel. The both difference sumed number counting 40d, 41d 42d inputted selection 45. being smallest value among three thereof, is sent 44. At time sending next image, 44 switches using this number. This operation executed each one be transmitted picture just before. A table selecting incorporated frame forming 46 outputted as data. decoding, deciphered decoded 1 selected table. COPYRIGHT: (C)1995,JPO