Device for objectively evaluating the quality of a digital transmitted picture
AssigneeKDD Corporation
InventorsRyoichi Kawada, Shuichi Matsumoto
Life of this patent
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Abstract
A device for objectively evaluating the quality of a digitally transmitted picture. This device compresses encoded pictures x1 and x2 transmitted on two links that are decoded by a first decoder and a second decoder. A variance value σ2(x1) of the decoded picture decoded by the first decoder is measured by a variance measuring unit. A variance value σ2(x1−x2) of a signal indicative of a difference between the decoded pictures decoded by the first and the second decoders is measured. These two variance values are used to determine image quality.
Claims6
A device for objectively evaluating the quality of a digital transmitted picture to be transmitted in a redundant parallel transmission system consisting of a first link (x1) and a second link (x2), the device comprising:
- means for measuring a variance value σ2(x1) of a received picture on the first link;
- means for measuring a variance value of a signal indicative of a difference σ2(x1−x2) between the received picture on the first link and another received picture on the second link;
- and
- means for holding therein a corresponding table indicative of relationship between the two variance values and SN ratios of the received pictures to an original picture;
- the quality of the received picture being evaluated in reference to the corresponding table based on the two variance values.
A device for objectively evaluating the quality of a digital transmitted picture to be transmitted in a transmission system consisting of a first link (x1) and a second link (x2), the device comprising:
- means for measuring a variance value σ2(x1) of a received picture on the first link, the received picture being subjected to filtration representing visual characteristics;
- means for measuring a variance value of a signal indicative of a difference σ2(x1−x2) between the received picture on the first link and another received picture on the second link, each of the received pictures being subjected to the filtration;
- and
- means for holding therein a corresponding table indicative of relationship between the two variance values and SN ratios of the received pictures to an original picture, the original picture being subjected to filtration representing visual characteristics and the received picture having been subjected to the filtration;
- the quality of the received picture being evaluated in reference to the corresponding table based on the two variance values.
Dependencies are inferred from the claim text.