Method and system for compressed image data storage and reproduction

Abstract: A DV camera 38 provides DV data recorded on a tape 52 to a PCI bridge 43 through a DV data output terminal 57 while decompressing the DV data. The DV data thus decompressed are converted into analog signals with a video encoder 58 and outputted through an analog video signal output terminal 59. A video decoder 42 converts the analog video signals into digital signals. The PCI bridge 43 outputs the digital data to a graphic card 34. In this way, moving pictures provided from the DV camera 38 are displayed on a CRT 32. The PCI bridge 43 transfers the DV data provided by an interface 41 to a memory. The data stored in the memory 27 is written into the hard disk 26 under control of the CPU 23.

Description: This invention relates to a storing/reproduction system of compressed image data provided by a compressed image data supply apparatus. A system shown in Fig. 4 is known as a system for storing image data provided by a digital video (hereinafter referred to as DV) camera into a computer. In the system, DV data outputted by the DV camera 38 are provided to a peripheral component interconnect (hereinafter referred to as PCI) bridge 66b through an IEEE1394 interface 66a. The DV data thus provided are stored temporarily in a memory 27 under the control of the PCI bridge 66b. The DV data stored in the memory 27 are decoded (decompressed) and transferred to a graphic card 34 under the control of a CPU 23. The graphic card 34 outputs analog RGB signals to a cathode ray tube (hereinafter referred to as CRT) 32 in accordance with the decoded data. In this way, images are displayed on the CRT 32 in accordance with the DV data thus outputted. At that time, the DV data are stored in a hard disk 26 while temporarily buffering the DV data in the memory 27 in accordance with a retrieval initiation command in parallel with the data transfer to the graphic card 34 under the control of the CPU 23. The DV data provided by the DV camera 38 can be stored while displaying them on the CRT 32 in video overlay manner. The system described above, however, has the following problems to be solved. In order to display the DV data on the CRT 32 in the video overlay manner, decoding of the DV data needs to be carried out on a real-time basis. Not all the frames can be processed with the CPU 23 when it has lower processing capabilities than it should be. Consequently, a part of the frames might be lacked and/or other trouble(s) arises as a result of the low processing capabilities. A dedicated hardware for decoding the DV data such as a DV compressor/decompressor (hereinafter referred to as DV CODEC) is needed in order to resolve the problems described above. The problems arise not only for storing DV data, but also arise for reproducing the DV data stored in the hard disk 26 when the DV data are read out therefrom. It is known from US-A-5,576,839 to provide a still video camera which outputs an analogue image data signal to a DAT recorder which digitises and records the image signals for subsequent reproduction. It is also known from DE-A-19713635 to provide a vide camera having a CODEC for deriving compressed image data and an internal memory for storing the compressed image data. The camera also has an output for communicating the compressed image data to a personal computer and a further output for sending analogue image signals to a television set. It is an object of the present invention to provide an improved data storing system and data reproduction system. Aspects of the present invention are set out in the appended claims. While the novel features of the invention are set forth in a general fashion, both as to organization and content, it will be better understood and appreciated, along with other objects and features thereof, from the following detailed description taken in conjunction with the drawings. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a functional block diagram of a data storing/reproduction system 1 according to the present invention. Fig. 2 is a block diagram illustrating an example of hardware structure of the data storing/reproduction system 1 according to the present invention. Fig. 3 is another block diagram illustrating details of a DV camera and an overlay display/memory board. Fig. 4 is other block diagram illustrating hardware structure of the conventional data storing/reproduction system. THE BEST MODE OF EMBODIMENTS FOR CARRYING OUT THE PRESENT INVENTION 1. FUNCTIONAL BLOCK DIAGRAM An embodiment of the present invention will be described herein referring to the drawings. Fig. 1 is a functional block diagram of a data storing/reproduction system 1. A data storing/reproduction system 1 is a system capable of storing image data therein while displaying images on a display of a computer system in accordance with image data provided by a compressed image data apparatus, the system 1 also capable of reproducing the image data thus stored. The apparatus 3 is switchable to either in a first operation mode or a second operation mode. The apparatus 3 outputs both compressed image data and analog video signals corresponding to the compressed image data in the first operation mode. The apparatus 3 is capable of being inputted compressed image data therein from outside and analog video signals being decompressed and converted by the apparatus 3 are outputted therefrom in a second operation mode. Further, the computer system 20 includes storing means 13, display means 15, converting means 12, and control means 14. The storing means 13 stores compression image data when the image data are provided thereto. Also, the display means 15 displays images provided thereto. Further, the converting means 12 connected with the apparatus 3 converts the analog video signals into digital data. The image data converted by the converting means 12 are provided to the display means 15 while storing the compressed image data provided by the apparatus 3 in the storing means 13 under the control of the control means 14 when the apparatus 3 is in the first operation mode, the converting means 12 converting analog video signals provided by the apparatus 3 into the image data. Further, the compressed image data stored in the storing means 13 are provided to the apparatus 3, and the analog video signals outputted by the apparatus 3 are converted into digital data by the converting means 12 and provided to the display means 15 under the control of the control means 14 when the apparatus 3 is in the second mode. 2. HARDWARE STRUCTURE Fig. 2 shows an example of hardware structure of the system 1. The system 1 comprises a DV camera 38, a computer 21 and a CRT 32. In this embodiment, the DV camera 38 forms a compressed image data apparatus, both the computer 21 and the CRT 32 act as the computer system, and the DV data forms the compressed image data. Details of the DV camera 38 will be described herein with reference to Fig. 3. The DV camera 38 includes an image data processor 55, a DV CODEC 53, an IEEE1394 interface (hereinafter referred to as interface) 51, a controller 54, a mode selection switch 56, a DV data output terminal 57, a video encoder 58, and an analog video signal output terminal 59. Other mechanisms such as drive mechanisms, optical systems, and an liquid crystal display (hereinafter referred to as LCD) all of which equipped with the available DV cameras are omitted from the drawing for clarity. The data processor 55 converts the image data provided thereto into YUV digital signals. The DV CODEC 53 compresses the YUV digital signals in a digital form when the YUV digital signals are provided to thereto. The compressed digital data are recorded on a video tape 52 while providing them to the interface 51 for outputting through the output terminal 57. Further, the DV CODEC 53 converts DV data into digital YUV data and provides them to the video encoder 58 when the DV data are provided thereto. The encoder 58 converts the YUV digital signals provided either by the data processor 55 or the DV CODEC 53 into analog video signals and outputs the analog signals through the output terminal 59. The mode selection switch 56 is used for switching operation modes of the DV camera 38 to either in a picture recording mode or in a playback mode. In the picture recording mode, the controller 54 connects the data processor 55 and the DV CODEC 53 so as to provide the YUV digital signals outputted by the data processor 55 to the DV CODEC 53. In this way, the image signals provided by the data processor 55 are compressed by the DV CODEC 53 under one frame basis, and the compressed signals are recorded on the video tape 52 while outputting the compressed signals from the output terminal 57 through the interface 51. Further, the YUV digital signals provided by the data processor 55 are converted into analog video signals with the encoder 58, and the analog signals thus converted are outputted through the output terminal 59. In the playback mode, the controller 54 provides the DV data recorded on the tape 52 to the interface 51. As a result, the DV data recorded on the tape 52 are outputted through the output terminal 57. Further, the DV data recorded on the tape 52 are provided to the DV CODEC 53 under the control of the controller 54. The DV data thus provided are decompressed with the DV CODEC 53 and outputted to the encoder 58. The encoder 58 converts the decompressed data into analog video signals, and provides the analog video signals to both an LCD (not shown) and to the output terminal 59. Consequently, images of the DV data recorded on the tape 52 are displayed on the LCD while outputting the analog video signals through the output terminal 59. In this embodiment, both the picture recording mode and the playback mode for reproducing the data recorded on the tape form the first operation mode. Further, the controller 54 provides DV data inputted by an external equipment and the like to the DV CODEC 53 when no output of the tape is detected as well as inputs of the DV data from the external equipment through both the output terminal 57 and the interface 51 are detected. The DV data thus provided are decompressed with the DV CODEC 53. The data thus decompressed are converted into analog video signals by the encoder 58. Consequently, images of the DV data inputted by the external equipment are displayed on the LCD while outputting the analog video signals through the output terminal 59. In this embodiment, the playback mode for reproducing the DV data inputted by the external equipment forms the second operation mode. Details of the computer 21 will be described herein with reference to Fig. 2. The computer 21 includes an overlay reproduction/storing board 36, a hard disk 26, a keyboard 28, a memory 27, a CPU 23, a flexible disk drive (hereinafter referred to as FDD) 25, a graphic card 34 and a bus line 29. The CPU 23 controls other parts through the bus line 29 in accordance with a control program stored in the hard disk 26. The control program is a program which is installed in the hard disk 26 by reading out from a flexible disk 25a through the FDD 25. The control program can also be installed in the hard disk 26 from a computer readable media substantially incorporated with program(s) stored in CD-ROMs, IC cards or the like, beside the flexible disk(s). Further, the control program may be downloaded into the hard disk 26 through a communication line. In this embodiment, the control program stored in the flexible disk(s) is executed indirectly on the computer by installing the control program in the hard disk 26 from the flexible disk(s). But, it is not limited to do that, the control program stored in the flexible disk(s) 25a can be executed directly on the computer system through the FDD 25. The control program which can be executed by the computer used in this embodiment is not only the program itself being executed directly on the computer by installing it under as is condition, but the control program in the embodiments described herein also includes a control program which need to be converted into other form(s) such as decompressed data and so on as well as another control program which can be executed on the computer which combines with other modules such as operating systems or a library. The DV data provided by the DV camera 38 are also stored in the hard disk 26. Various calculation results as well as the DV data are stored in the memory 27. Further, the CRT 32 is connected to the graphic card 34. Details of the board 36 will be described herein referring back to Fig. 3. The board 36 includes an IEEE1394 interface (hereinafter referred to as interface) 41, a video decoder 42, a PCI bridge 43, a DV data input terminal 47, and an analog video signal input terminal 49. The video decoder 42 is connected to the input terminal 49. And the interface 41 is connected to the input terminal 47. Further, the video decoder 42 converts the analog video signals provided through the input terminal 49 into digital data and provides the digital data to the PCI bridge 43. The DV data outputted to the input terminal 47 are provided to the PCI bridge 43 under the control of the interface 41. The PCI bridge 43 outputs the digital data provided by the decoder 42 to the graphic card 34 shown in Fig. 2. In addition, the PCI bridge 43 outputs the DV data provided by the interface 41 to the memory 27 shown in Fig. 2 in accordance with both an initiation and a termination commands for retrieving the DV data, both provided by the CPU 23 shown in Fig. 2. Detailed procedures of the commands will be described later. In other words, the board 36 can carry out a direct memory access (DMA) without using the CPU 23, so that no DV CODEC is mounted thereon. 3. OVERLAY PLAYBACK/REPRODUCTION PROCEDURES Next, procedures of video overlay storing/reproduction according to the present invention will be described herein. Procedures of video capturing in which image data recorded on the tape 52 installed in the video camera 38 are displayed on the CRT 32 in overlay manner while storing a desired part of the data in the hard disk will be described as an example herein. An operator of the system connects between the DV camera 38 and the board 36 so as to communicate data therebetween. Practically, the operator connects between the output terminals 57, 59 and the input terminals 47, 49 respectively as shown in Fig. 3. Both the DV data terminal 47 and the terminal 57 form a compressed image data terminal in this embodiment. The operator enters a video capturing initialization command through the keyboard 28. On receipt of the command, the CPU 23 initialize the board 36. Reproduction of data recorded on the tape 52 is carried out by the operations of the operator such as insertion of the tape 52 into the DV camera 38 and carrying out necessary steps for playback mode. The DV CODEC 53 shown in Fig. 3 decompresses DV data provided from the tape 52, and the data thus decompressed are converted into analog signals by the video encoder 58, further the analog signals are outputted through the output terminal 59. The analog signals thus outputted are provided to the video decoder 42 through the input terminal 49. The analog signals provided to the video decoder 42 are converted into digital signals thereby, and the converted signals are outputted to the PCI bridge 43. The PCI bridge 43 outputs the digital signals to the graphic card 34 via a bus line (a PCI bus line). In this way, the video images recorded on the tape 52 in the DV camera 38 are displayed on the CRT 32 as moving pictures. The operator, who watches the moving pictures displayed on the CRT, enters the initiation command of DV data through the keyboard 28 when a desired images are displayed thereon. Upon entering the initiation command, the CPU 23 provides it to the PCI bridge 43 shown in Fig. 3. By the way, the original DV data of the moving pictures displayed on the CRT 32 are provided to the PCI bridge 43 through the DV CODEC 53 of the DV camera 38, the interface 51, the terminal 57, the DV data terminal 47 of the board 36, and the interface 41. The DV data provided by the interface 41 are transferred to the memory 27 shown in Fig. 2 when the PCI bridge 43 receives the initiation command. The CPU 23 transfers the DV data stored in the memory 27 to the hard disk 26 when the transmission of the DV data is detected thereby. The operator, who watches the moving pictures displayed on the CRT, enters a termination command of DV data retrieval through the keyboard 28 when the retrieval of the desired images is completed. Upon entering the termination command, the CPU 23 provides the termination command to the PCI bridge 43 shown in Fig. 3. The PCI bridge 43 stops the transmission of the DV data to the memory 27. Moving pictures are continuously displayed on the CRT 32 during the data storing in the memory 27 because the PCI bridge 43 outputs both the data from the interface 41 and that from the video decoder 42 so as not to collide with each other. The following procedures are carried out in the system according to the present embodiment. The DV camera 38 outputs DV data recorded on the tape 52 and being reproduced thereby to the PCI bridge 43 through the terminal 57 while outputting analog video signals being decoded and converted from the DV data to the output terminal 59. The video decoder 42 converts the analog signals thus outputted into digital signals. The PCI bridge 43 outputs the DV data received from the DV camera 38 to the graphic card 34. In this way, the video images outputted from the DV camera 38 are displayed on the CRT 32. Also, the PCI bridge 43 transfers the DV data provide by the interface 41 to the memory 27. The data stored in the memory 27 is written into the hard disk 26 under the control of the CPU 23. The DV data recorded on the tape 52 in the DV camera 38 can be displayed on the monitor of the computer system while storing desired part of the moving pictures in the storing medium of the computer by carrying out these procedures. Images for monitoring and that for storing are outputted respectively through the analog video signal output terminal and the DV data output terminal. The following advantages can be achieved by carrying out the separate output. One of the advantages is that inputted DV data can be stored in a hard disk while monitoring them as moving pictures which move smoothly under no lack of frames without additional hardware(s) such as a board for decompression of DV data. Further advantage is that no decoding is required by the CPU using a program, so that CPU load may be decreased. Especially, the PCI bridge 43 transfers DV data to the memory 27 by using bus mastering technique without using by the CPU 23 in the above-mentioned embodiments. In this way, the CPU load can further be decreased. Additional advantage is that the DV CODEC, an expensive component, is not required in the system since the hardware installed in the DV camera is used as substitution thereof. As a result, the overall system can be produced in a low manufacturing cost. The interface 41 and the decoder 42, both providing data to the PCI bridge 43 are mounted on the board 36, and the PCI bridge 43 outputs both the data from the interface 41 and that from the video decoder 42 so as not to collide with each other. In this way, one additional vacancy in the PCI slots can be expected in comparison with when each of the interface 41 and the video decoder 42 is mounted separately on the board 36. Still another advantage is that no driver for controlling the video decoder 42 is required in the system in comparison with when the video decoder 42 is mounted on the graphic card 34. Reproduction of the DV data stored in the hard disk is carried out as the followings in the system described earlier. The operator turns the mode selection switch 56 of the DV camera 38 to the playback mode, and then enters a playback command through the keyboard 28. Upon receipt of the command, the CPU 23 provides it to the PCI bridge 43. Also, the CPU 23 reads out the DV data from the hard disk 26 and transfers them to the memory 27. The PCI bridge 43 reads out the DV data from the memory 27 and transfers them to the DV camera 38 through the interface 41. The DV CODEC 53 decodes and converts the DV data thus transferred into analog signals, and the analog signals are outputted therefrom through the output terminal 59. The video decoder 42 converts the analog video signals into digital data and provide them to the PCI bridge 43. The PCI bridge 43 transfers the digital data directly to a frame memory in the graphic card 34. In this way, the DV data stored in the hard disk 26 can be displayed on the CRT 32. The PCI bridge 43 controls the timing between data-reading of the DV data from the memory 27 and data-transfer of the DV data received from the video decoder 42 under time sharing basis in such a manner that both of the processes seems to be carried out simultaneously. 4. OTHER EMBODIMENTS Although, the DV data recorded on the tape 52 are stored in the hard disk 26 while the data are displayed on the CRT 32 in video overlay manner in the embodiments described earlier, similar procedures to the embodiments can be carried out even when the DV camera 38 is in the picture recording mode because both DV data and analog video signals are outputted from the camera 38. Though, a part of the DV data provided by the DV camera 38 are stored in the hard disk 26 by entering either of the initiation command or the termination command in the embodiments described earlier, complete DV data provided by the DV camera 38 may be stored in the hard disk 26. In that case, the operator may put the computer system in a state capable of carrying out video capturing while providing desired moving pictures from the DV camera 38. Although, both the initiation command and the termination command are entered through the keyboard 28 in the embodiments described earlier, these commands may be inputted through other input means such as a mouse and the like. In the embodiments described above, digital overlay technique in which the video decoder 42 converts the analog video signals provided by the DV camera 38 into a data format capable of being processed with the graphic card 34, and the PCI bridge 43 transfers the converted data to the graphic card 34, is employed. Alternatively, analog overlay technique in which signals outputted from both the graphic card and additional frame memory are synthesized with an analog circuit and outputted to the monitor, the display rate of the frame memory corresponding to that of the graphic card 34, may be used instead of the digital overlay technique. In the embodiment described earlier, the data processor 55 converts the image data into YUV digital signals. The data processor 55 may converts the image data into other formats of digital signals such as RGB digital signals. DV data are used as the compressed image data in the embodiment described earlier, the compressed image data includes a concept which represents all the data once compressed and need to be decompressed when they are displayed. For instance, the data to be processed in Moving Picture Experts Group (hereinafter referred to as MPEG) or in Joint Photographic Experts Group (hereinafter referred to as JPEG) may be used as the data to be transformed with discrete cosine transform (hereinafter referred to as DCT). The data compressed in other method such as wavelet transform or that compressed in vector quantization may also be used as the compressed image data. Further, data transform method capable of reversible may also be used in addition to the data transform incapable of reversible. The DV camera, used as a DV imaging means capable of carrying out picture recording is used as a compressed image data apparatus, other apparatus such as a computer which installs a DV board or a DV deck may also be used as the compressed image data apparatus. Although, the compressed image data provided by the compressed image data apparatus are stored into a magnetic data storing medium such as the hard disk in the embodiment described earlier, the compressed image data may also be stored into other kinds of data storing mediums such as an optical data storing medium and an electrical data storing medium. The compressed image data may further be stored into data storing mediums such as a storing medium defined by a ZIP format, a compact disk-recordable (CDR), a mini disk (MD), a phase change dual disk (PD disk), a digital video disc-random access memory (DVDRAM), and a ferroelectric memory and the like. Both a computer software and the CPU 23 are used for realizing functions shown in Fig. 1 in the above embodiments, a part of or all of the functions can be realized by a computer hardware such as logic circuits or the like. In a data storing/reproduction system according to the present invention, the apparatus performs the following steps in each of the operating modes; in the first operating mode, the apparatus outputs the compressed image data being outputted while outputting analog video signals corresponding to the compressed image data provided therefrom, the analog video signals being converted from uncompressed digital signals, and the uncompressed digital signals being decompressed from the compressed image data, and in the second operation mode, the apparatus being capable of being inputted compressed image data therein from outside and outputs analog video signals converted from uncompressed digital image data which is decompressed from the inputted compressed image data provided therefrom. The control means connected to the apparatus, carries out the following steps; providing compressed image data received from the apparatus to the storing means while providing digital data converted by the converting means to the display means, the apparatus being switched to the first operation mode, and providing compressed image data stored in the storing means to the apparatus, the apparatus being switched to the second operation mode, and providing digital data to the display means when analog video signals decompressed by the apparatus are outputted therefrom, the digital data being converted by the converting means from the decompressed analog video signals. In this way, both data storing with visual confirmation of the inputted images and data reproduction can be carried out by the system having a simple structure. In a data storing system according to the present invention, control means is connected to a compressed image data apparatus and converting means, and the control means carries out a step for providing digital data converted by the converting means to display means while providing compressed image data outputted by the compressed image data apparatus to storing means. In this way, data storing with visual confirmation of the inputted images can be carried out by the system having a simple structure. In a data storing system according to the present invention, a compressed image data apparatus outputs analog video signals corresponding to compressed image data when the compressed image data are outputted therefrom. The compressed image data provided by the compressed image data apparatus are received through a compressed image data interface included in an overlay display/storing board. The compressed image data thus received are stored in a memory temporarily under the control of a display/storing controller. The compressed image data stored in the memory is stored in a hard disk under the control of a central processing unit. On the other hand, a video decoder converts the analog video signals provided by the compressed image data apparatus into digital data. Also, the display/storing controller provides the digital data outputted by the video decoder to a graphic board part. Further, the graphic board part controls display of the digital data on a monitor of a the computer. In this way, data storing with visual confirmation of the inputted images can be carried out by the system having a simple structure. In an overlay display/memory board according to the present invention, a video decoder converts analog video signals into digital data, the analog video signals corresponding to the compressed image data being outputted by the compressed image data apparatus which outputs the analog video signals when compressed image data are outputted therefrom. Also, a display/storing controller connected to the video decoder and a compressed image data interface provides digital data outputted by the video decoder to a graphic board part connected to the monitor through a bus line while storing compressed image data to a memory of the computer through the compressed image data interface via the bus line. In this way, data storing with a high speed video overlay can be carried out as well as decreasing CPU load. In an overlay display/memory board according to the present invention, compressed image data and analog video signals corresponding to the compressed image data are outputted by the compressed image data apparatus in a first operating mode. A display/storing controller provides digital data converted by a video decoder to a graphic board part which controls display of a monitor of a computer system through a bus line while storing compressed image data received through a compressed image data interface to a memory of the computer system in an overlay display/memory mode. In this way, data storing to the hard disk with video overlay on the monitor can be carried out by just performing a step for transmitting the data stored in the hard disk. Also, the display/storing controller provides compressed image data stored in the hard disk of the computer system to the compressed image data apparatus through the compressed image data interface in a playback/display mode. The compressed image data apparatus is capable of being inputted compressed image data therein from outside and analog video signals being decompressed and converted by the compressed image data apparatus are outputted therefrom in a second operation mode. In this way, the analog video signals thus outputted are provided to the video decoder. The display/storing controller outputs the digital data converted by the video decoder to the graphic board part through the bus line. Therefore, reproduction of images can be carried out even when no means for decompressing the compressed image data is included in the computer. In a data storing method according to the present invention, the compressed image data provided by the apparatus are stored in a data storing medium while displaying images in accordance with the analog video signals provided by the apparatus during a data storing mode when the apparatus is in the first mode, and the compressed image data stored in the data storing medium are provided to the apparatus, and images on a display screen are displayed in accordance with the analog video signals provided by the apparatus during a data reproduction mode when the apparatus is in the second mode. In this way, the compressed image data can be stored while displaying the image data from the compressed image data apparatus without installing a dedicated board or means dedicated for image compression on the computer because the analog video signals corresponding to the compressed image data are outputted by the compressed image data apparatus. In a data storing method according to the present invention, compressed image data provided through a compressed image data terminal of a compressed image data apparatus are stored in a data storing medium of a computer system without carrying out decompression while displaying images on a display screen of the computer system in accordance with the compressed image data provided by the compressed image data apparatus. In this way, the compressed image data can be stored while displaying the image data from the compressed image data apparatus without installing a dedicated board or means dedicated for image compression on the computer because the analog video signals corresponding to the compressed image data are outputted by the compressed image data apparatus. In a data reproduction method according to the present invention, images generated in accordance with compressed image data stored in a data storing medium of a computer system are displayed on a display screen of the computer system, the method comprises the following steps; connecting a compressed image data apparatus with the computer system, the compressed image data apparatus carrying out decompression of compressed data, converting digital signals into analog signals, and outputting the analog signals thus converted therefrom, providing the compressed image data stored in the data storing medium to the compressed image data apparatus, and displaying images on the display screen in accordance with the analog signals received from the compressed image data apparatus, the analog signals being decompressed. In this way, the compressed image data can be reproduced without installing a dedicated board or means dedicated for image compression on the computer. Definition of words and a phrase used in the appended claims, and correspondence between these words and the phrase to words and a phrase used in the embodiments herein are as follows. The word "storing means" correspond to the memory 27 and the hard disk 26 depicted in Fig. 2 in the embodiments described above. Another word "converting means" correspond to the PCI bridge 43 shown in Fig. 3 in the embodiments described above. Data transmission to each of the memory 27, the graphic card 34, and the interface 41 carried out by the PCI bridge 43, and that to the hard disk 26 from the memory 27 carried out by the CPU 23 correspond respectively to the word "control". Another word "display/storing controller" correspond to the PCI bridge 43 shown in Fig. 3 in the embodiments described above. Another word "display means" correspond both to the graphic card 34 and the CRT 32 shown in Fig. 2 in the embodiments described earlier. Another word "graphic board part" correspond to the graphic card 34 depicted in Fig. 2 in the embodiments described in above. Another word "compressed image data" means image data being compressed, regardless of its method, degree of compression, and other factors. Words "decompressed, decompression" means a step to carry out decoding of compressed image data, it is also referred to as expansion of data. A phrase "analog video signals corresponding to compressed image data" undoubtedly includes signals being decoded from compressed image data and then converted into analog format, and the phrase also includes signals being converted into analog format before decoding the compressed image data.

Claims: Computer apparatus comprising: a processor (23); an interconnect board (36) for connection in use to an image data apparatus; a graphic board for outputting display signals to a monitor; a first memory; and a bus line providing data communication between the processor, interconnect board, graphic board and the first memory; wherein the interconnect board comprises: a compressed image data interface (41) for connection in use to the image data apparatus, the interface being operable to receive compressed image data provided by the image data apparatus, a video decoder (42) having means (49) for connection in use to the image data apparatus, the video decoder being operable to convert analog video signals received in use from the apparatus and corresponding to the compressed image data, and a controller (43) connected to the video decoder, the interface and the graphic board, the controller being operable to provide digital data outputted by the video decoder to the graphic board through the bus line (29) while storing the compressed image data to the first memory via the bus line. Computer apparatus as claimed in claim 1, wherein the controller is responsive to an initiating command from the processor to initiate the transfer of the compressed image data to the first memory. Computer apparatus as claimed in claim 2 wherein the controller is responsive to a termination command from the processor to terminate the transfer of compressed image data to the first memory. Computer apparatus as claimed in any preceding claim wherein the processor is operable to transfer the compressed image data from the first memory to a hard disk memory. Computer apparatus as claimed in any preceding claim wherein the controller is responsive to a mode setting signal from the processor to access compressed image data from the hard disk memory and to output the compressed image data via the compressed image data interface to the image data apparatus while converting analogue video signals received from the image data apparatus corresponding to the output compressed image data and outputting converted digital data to the graphic board via the bus line. Computer apparatus as claimed in any preceding claim wherein the compressed image data is data compressed by discrete cosine transform. An interconnect board for use in the computer apparatus of any preceding claim and comprising a compressed image data interface (41) adapted for connection to image data apparatus, the interface receiving compressed image data provided by the apparatus, a video decoder (42) adapted for correction to the image data apparatus; and adapted to convert analog video signals received from the image data apparatus and corresponding to the compressed image data, and a controller (43) adapted to control the video decoder and the interface to provide digital data outputted by the video decoder to a graphic board through a bus line (29) while storing the compressed image data to a first memory via the bus line. A method of operating a computer apparatus comprising a processor (23); an interconnect board (36) for connection in use to an image data apparatus; a graphic board for outputting display signals to a monitor; a first memory; and a bus line providing data communication between the processor, interconnect board, graphic board and the first memory; wherein the method comprises: connecting a compressed image data interface (41) of the interface board to the image data apparatus, the interface receiving compressed image data provided by the apparatus, connecting a video decoder (42) of the interconnect board to the image data apparatus; and operating the video decoder to convert analog video signals received from the image data apparatus and corresponding to the compressed image data, and a controller (43) of the interface board controlling the video decoder and the interface to provide digital data outputted by the video decoder to the graphic board through the bus line (29) while storing the compressed image data to the first memory via the bus line. A method as claimed in claim 8, wherein the controller responds to an initiating command from the processor to initiate the transfer of the compressed image data to the first memory. A method as claimed in claim 9 wherein the controller responds to a termination command from the processor to terminate the transfer of compressed image data to the first memory. A method as claimed an any of claims 8 to 10, wherein the processor transfers the compressed image data from the first memory to a hard disk memory. A method as claimed in any of claims 8 to 11 wherein the controller responds to a mode setting signal from the processor to access compressed image data from the hard disk memory and to output the compressed image data via the compressed image data interface to the image data apparatus while converting analogue video signals received from the image data apparatus corresponding to the compressed image data and outputting converted digital data to the graphic board via the bus line. A method as claimed in any of claims 8 to 12 wherein the compressed image data is date compressed by a discrete cosine transform. A method as claimed in any of claims 8 to 13 wherein the image data apparatus is a digital video camera.

Inventors: FUJIOKA YOSHIHIDE, FUJIOKA, YOSHIHIDE
Applicants: CANOPUS CO LTD, CANOPUS CO., LTD.
Application year: 1999
Main classification: H04N5
IPC codes: H04N5, H04N7