Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
1997-11-25
2001-10-23
Chevalier, Robert (Department: 2615)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C386S349000
Reexamination Certificate
active
06308002
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a picture receiving apparatus, a picture receiving method, a picture sending apparatus, a picture sending method, a picture sending/receiving apparatus, and a picture sending/receiving method, in particular to a picture receiving apparatus for receiving a still picture sent through a transmission medium, a picture receiving method thereof, a picture sending apparatus thereof, a picture sending method thereof, a picture sending/receiving apparatus thereof, and a picture sending/receiving method thereof.
BACKGROUND ART
When a still picture is sent through a transmission medium such as an ISDN (Integrated Service Digital Network) line, the sender side performs a picture compressing process for the still picture and the receiver side performs a picture decompressing process for the received signal so as to restore the original still picture.
However, when picture data that is sent through a transmission medium whose transmission rate is not sufficiently high such as an ISDN line is received by a receiving apparatus and supplied to a video signal recording apparatus such as a DVCR (Digital Video Cassette Recorder), the receiving apparatus cannot sufficiently supply the picture signal to the DVCR. In the worst case, a decoding error may take place in the DVCR.
In addition, it takes around 13.5 seconds to send one frame of still picture through the ISDN line. Thus, when picture data is retrieved from for example a database connected to the ISDN line, it takes a long time to determine whether or not the received picture is a desired picture.
DISCLOSURE OF THE INVENTION
The present invention is made from the above-described point of view. An object of the present invention is to allow the user to see the content of an original picture decoded from picture information received through a transmission medium as quick as possible and free from a decoding error.
The present invention is a picture receiving apparatus for receiving a picture signal that is sent in the order of DC components and AC components through a transmission medium, performing a predetermined process for the picture signal, and outputting the resultant picture signal to a peripheral unit, comprising a receiving means for receiving the picture signal, a storing means for storing the picture signal received by said receiving means, a reading means for successively reading the picture signal stored in said storing means, an adding means for adding EOB information representing the end position of data to each macro block contained in a sync block composing the DC components read by said reading means, and an outputting means for outputting the DC components received from said adding means and the AC components received from said reading means.
The present invention is a picture receiving method for receiving a picture signal that is sent in the order of DC components and AC components through a transmission medium, performing a predetermined process for the picture signal, and outputting the resultant picture signal to a peripheral unit, comprising the steps of receiving the picture signal, storing the picture signal received at the receiving step, successively reading the picture signal stored at the storing step, adding EOB information representing the end position of data to each macro block contained in a sync block composing the DC components read at the reading step, and outputting the DC components received at the adding step and the AC components received at the reading step.
The present invention is a picture receiving apparatus for receiving DC components of a picture signal sent through a transmission medium, performing a predetermined process for the DC components, and outputting the resultant data to a peripheral unit, comprising a receiving means for receiving the DC components, a storing means for storing the DC components received by said receiving means, a reading means for successively reading the DC components stored in said storing means, an adding means for adding EOB information representing the end position of data to each macro block contained in a sync block composing the DC components read by said reading means, and an outputting means for outputting the DC components received from said adding means.
The present invention is a picture receiving method for receiving DC components of a picture signal sent through a transmission medium, performing a predetermined process for the DC components, and outputting the resultant data to a peripheral unit, comprising the steps of receiving the DC components, storing the DC components received at the receiving step, successively reading the DC components stored at the storing step, adding EOB information representing the end position of data to each macro block contained in a sync block composing the DC components read at the reading step, and outputting the DC components received at the adding step.
The present invention is a picture sending/receiving apparatus having a sender unit and a receiver unit, the sender unit sending a picture signal through a transmission medium, the receiver unit reproducing the received picture signal, wherein the sender unit comprises a separating and extracting means for separating and extracting DC components and AC components from the picture signal, a first sending means for sending the DC components extracted by said separating and extracting means through the transmission medium, and a second sending means for sending the AC components extracted by said separating and extracting means through the transmission medium, and wherein the receiver unit comprises a receiving means for receiving the DC components and the AC components, a storing means for storing the DC components and the AC components received by said receiving means, a reading means for successively reading the DC components and the AC components stored in said storing means, an adding means for adding EOB information representing the end position of data to each macro block contained in a sync block composing the DC components read by said reading means, and an outputting means for outputting the DC components received from said adding means and the AC components received from said reading means.
The present invention is a picture sending/receiving method of a sender unit and a receiver unit, the sender unit sending a picture signal through a transmission medium, the receiver unit reproducing the received picture signal, comprising the steps of (a) causing the sender unit to separate and extract DC components and AC components from the picture signal, (b) causing the sender unit to send the DC components extracted at step (a) through the transmission medium, (c) causing the sender unit send the AC components extracted at step (a) through the transmission medium, (d) causing the receiver unit to receive the DC components and the AC components, (e) causing the receiver unit to store the DC components and the AC components received at step (d), (f) causing the receiver unit to successively read the DC components and the AC components stored at step (e), (g) causing the receiver unit to add EOB information representing the end position of data to each macro block contained in a sync block composing the DC components read at step (f), and (h) causing the receiver unit to output the DC components received at step (g) and the AC components received at step (f).
According to the present invention, a picture signal is received and stored. EOB information that represents the end position of data is added to each macro block contained in a sync block composing DC components. The obtained DC components and the stored AC components are output. Thus, since the DC components that contain a rough contour are displayed earlier than the AC components, the content of the received picture can be quickly recognized.
According to the present invention, DC components are received and stored. The stored DC components are successively read. EOB information that represents the end position of data is added to each macro block contained in
Ishimaru Hiroyuki
Nishimura Hajime
Yoshikawa Munehiro
Chevalier Robert
Frommer William S.
Frommer & Lawrence & Haug LLP
Savit Glenn F.
Sony Corporation
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