Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
72 words
A method for picture coding comprising: a step of feeding picture data composed of one frame, a step of calculating the activity of the picture data in every frame, a step of comparing the activity with a specific value, and judging to perform frame unit coding when larger than a specific value, and to perform field unit coding by dividing a frame into fields when the activity is below a specific value.
Claim 2
Dependent Claim
69 words
A method for picture coding of claim 1, wherein the step for calculating the activity is to divide the input picture data into one or more two-dimensional blocks, compare the field block activity calculated in field unit and the frame block activity calculated in frame unit, and issue the number of blocks with the field block activity larger than the frame block activity as calculation output of the activities.
Claim 3
Dependent Claim
41 words
A method for picture coding of claim 1, wherein the step of changing over between frame unit coding and field unit coding is to change over when the activity is more than or below a specific value continuously in plural frames.
Claim 4
Dependent Claim
36 words
A method for picture coding of claim 1, wherein the step of changing over between frame unit coding and field unit coding is to change over with at least one of the predetermined plural changeover points.
Claim 5
Independent Claim
108 words
An apparatus for picture coding comprising: means for receiving and storing picture data composed in frames, activity calculating means for calculating the activity of the picture data in every frame, frame/field coding judging means for receiving the activity, and judging to perform frame unit coding when the activity is over a specific value or to perform field unit coding by dividing a frame into fields when the activity is below a specific value, and coding means for coding in frame unit or coding in field unit concerning the picture data on the basis of the judgement, and issuing a coded picture signal containing the frame/field coding judgement signal.
Claim 6
Independent Claim
71 words
A method for picture decoding comprising: a step of receiving a coded picture signal and extracting a frame/field coding judging signal from the coded picture signal input, a step of issuing a signal for changing over decoding action in frame unit or field unit depending on the frame/field coding judging signal, and a step of decoding the coded picture signal in frame unit or field unit according to the changeover signal.
Claim 7
Independent Claim
65 words
An apparatus for picture decoding comprising: means for receiving a coded picture signal and extracting a frame/field coding judging signal from the coded picture signal input, frame/field decoding changeover means for issuing a signal for changing over decoding action in frame unit or field unit, and decoding means for decoding the coded picture signal in frame unit or field unit according to the changeover signal.