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Tyrone Campbe Blog Archive What a great exhibition
Tyrone Campbe Blog Archive What a great exhibition ambitious plan in the field of image manipulation of high definition FPGA is
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Gears Manufacturers on Electron technology promotes the environmental protection of the car, security and recreational to promote in an all-round wayyingcharoen on How to watch after buying the TV? All-round understands HDMI technologyNike Air Max on Can harm the application in the detection system when real in digital wireless network techniqueCheap Jordans on Solution of seeing and hearing in IMT carSupra Strapped NS on Have provided exciting new service and chance of earning money for the changing into the industry of digital broadcasting from imitating radio, and the competition that carries on for producing the system that has attractive force of prices even more between OEM manufacturer is very fierce. However, just as situations faced when many other technology change, each enterprise has put forward a lot of new suggestion standards for the leading position of competitive market. No matter how standard group is to make great efforts to guarantee interoperability and fair competition, the first products with listing success will be possibly turned into a De Facto Standards. Even the one that is succeeded in releasing by the standard group gets the standard acknowledged in the world, will have a lot of different editions because of attempting to meet demands of numerous member companies too often. In addition, will carry on a lot of revision to the standard inevitably, such as after the on-the-spot test at early stage is feedbacked, or when anaphase stage have new algorithm or enhancement that is put forward. Very easy finds why a solution that can totally be programmed again is so attractive. For example, if you can programme the forward error correction that your system makes its coincidence new developing again algorithmically and revise the edition newly, or make use of new more reliable cryptographic method such as AES to replace the old cryptographic method, so acquired investment repayment will be considerable.
Table 3 Wait until the generally acknowledged standard agreement (STSC) of American advanced telecommunication in the industry Broadcast form overview defined. As will be seen in the table, apparatus manufacturers can carry on the numerous choices - high-resolution (HD) Standard definition (SD) ,16:9 or 4:3 is non-interlaced interleave etc. Though there is ASSP (particular application standardized product) ,But often each kind of standard needs different chips. Message transmission rate that FPGA solution can support to be required over HDTV easily,Air Jordan Shoes For Sale, this means a device can support all these forms, only needs to programme again according to the needs of apparatus. This can reduce the materials list project of enterprises, also got rid of ASSP supplier possible stock risk at the same time.
It is that spaces of color are varied to need to carry on another example that the standard chooses. Deal with it with the compression algorithm after the picture is gathered in from the camera, pass post-production and then until the same while the television reveals. The compression algorithm has utilized such a fact, all color informations that needn transmit a picture can get the satisfactory result. (red, green, blue) with RGB It is feasible that the form carries on image manipulation. In RGB form, every picture element is defined by corresponding to every three natural colored 8 or 10 bit words. But because some parts are smaller than some other responses in the human eye is to light frequency spectrum, so can utilize luminance or (Y) And color difference signal (such as CrCb) To represent the picture. The advantage of doing it in this way is to need minor memory and bandwidth of data. So need a kind of mechanism to carry on the conversion among different color forms, this is called the space of color to vary too. Once know the coefficient of shining upon another color space from a color space, it is very simple to realize by hardware in the circuit.
For example, in the digital television system,Timberland Boots Sale, YerCb color space can be changed to RGB color space according to the following formula:
R\ =1.164 (Y-16) + 1.596(Cr -128)
G\ =1.164 (Y-16) -0.813 (Cr -128) -0.392(Cb-128)
B\ =1.164 (Y-16) + 1.596 (Cr-128)
Among them R\ G\ B\ it is the garmma(γ) (Gamma) Correct RGB number value. Because of the CRT display device, among the control signal amplitude and output intensity received is not linear relationships. The garmma(γ) correction signal in front of the display unit can make to receive the relation linearization of signal amplitude and output intensity. Output the gain to noise temperature ratio and limit in certain threshold value too, thus reduce the dark department of picturing because transmits the incoming noise. There are many kinds of possible implement methods, usable memorizer, logic or embedded multiplier realize the required multiplication function in FPGA.
When needing changing among a large number of color spaces and choosing, it is very obvious to adopt the advantage of the converter of space of programmable color. Just as that YCrCb and RGB shown here vary, YUV and YPrPb adopt the algorithm similar to this, just coefficients are different to some extent. Though there are spaces of canonial color, the requirement among different apparatuses has a lot of different places. The high-resolution picture even adopts and defines different color spaces with the standard, but the apparatus with programming transformation coefficient can support definition of any input easily. At the same time if needing, the color space of multiple channel is varied and supported to can be accomplished too, and if do not adopt the programmable logic, this would usually need many ASSP. Certainly, utilize FPGA device,Burberry Handbags Cheap, the systematic framework can also be according to employing adjusting the corresponding algorithm,Cheap Nike Air Max 90, thus enable characteristic, efficiency or both realize maximizing at the same time.
FPGA is often used as the interface equipment of the network extensively by large-scale data and telecommunication enterprise. The programmable framework is very suitable for agreement management and data flow form to deal with, and high-speed the intersection of differentiating and I/O such as LVDS that FPGA offer, can make FPGA very quick the intersection of speed and read in and output data outside slice at slice. FPGA can also be used in the environment of local area, such as the Home Networking. European DVB (digital television broadcasting) The alliance adopts IEEE1394 high-speed I2C as the standard connection mode of products of the digital television recently.
With the intersection of world and a lot of the intersection of area and the intersection of high-resolution and appearance of broadcast, the intersection of video and SIGPROC signal processing demand, improve greatly. For example, adopt 1920* 1080 definition, 24 picture element and general compressed bandwidth that the high-resolution television of 30 frame line-by-line scanning per second will need about 1.5Gbps. Even not been carrying on the area of the radio of the high definition picture actually yet, in in all stages in post-production, that was adopted is the high definition picture too.
The latest programmable logic device has a plurality of LVDS (the differentiating signal of undervoltage) that can support this kind of data rate now I/O, there is such a I/O support even if in the low-cost device to the consumer market. This can mean video data not compressed import and export device and carry on real-time processing. HDTV real-time video processing with first class speed allows the designer to reduce the required external memory storage quantity. At present, because the signal processor part of the video becomes the bottleneck in the design, so often adopt a plurality of frame stores and data buffers in the Off-The-Shelf digital television system. Utilize parallel signal handling capacity of FGPA to mean the smaller one, even single frame store, but the data buffer can be totally saved. The standard DSP limitation in characteristic results in having to develop as the dedicated chip, such as the media processor, come to overcome these questions. However, the fact proves these devices except in some extremely narrow application in the range, there is a shortcoming not too flexible, there is a characteristic bottleneck that exists at the same time. But FPGA device can be passed and customized, offers the efficiency of maximum in utilization factor and characteristic. The designer can also trade off between designing area and speed, the clock rate that and can be much lower than DSP finishes the given function.
As noted previously, FPGA use in the specialized broadcast system only in the past, but the Moore law was meaning they were applying to the consumer products in enormous quantities gradually. Take digital television as examples, among them the set-box function totally integrates in TV, so the digital television can receive digital broadcasting. Usually this all receive the cost-free wireless signal through the standard antenna,Nike Free Run For Sale, but the future products will be allowed to receive and come from having wire cable, satellite or transmissive signal of DSL circuit. FPGA can be applied to a lot of inner parts of the digital television. As standard among the chip set Bind logic (glue logic) Strong points of FPGA, but a lot of image manipulation tasks (if the color space is varied) together And network interface (such as IEEE 1394) Can also realize in the low-cost programmable logic device now.
This trend of finishing image manipulation task with FPGA has an important actuator force: The ones that come from the industry referedly The figure is merged . Having produced some such demands at present, namely pass the extremely definite transmission channel (such as being wireless) Send the video data of the large bandwidth, will keep the acceptable service quality (QoS) at the same time . This cause until how improve the intersection of error correction and algorithm, compress and the intersection of picture and treatment technology carry on the intersection of range and more extensive research, and quite a few of work among them is around carrying on with FPGA device.
Adopting FPGA, the designer can make one own standard compatible system keep the difference with the rival products. Compress scheme as example with MPEG-2, can the intersection of MPEG and the intersection of processor and responsible the intersection of MPEG and the intersection of DCT and (discrete cosine transform) in the standard algorithm Unload and deal with partly in FPGA device, thus increase the bandwidth. DCT and inverse transformation usable FPGA realize high-efficiently, and have IP kernel optimized that can be applied to the design based on MPEG directly. But there is a lot of undefined module (such as motion prediction) in MPEG coding scheme . Through integrating the function such as DCT used for proprietary technology and standard of the module in FPGA structure, can create and can improve the low-cost one piece solution dealing with the bandwidth and reaching higher image quality. Only depend on the standard ASSP solution through avoiding the system, enterprises are no longer thought to offer very limited number of kind to be like the danger of the solution by the market.
FPGA can make your products introduce to the market faster, and can keep producing the ability that more camp accept after field installation for you. Most FPGA is based on SRAM technology, thus can programme the device again easily at each stages that develop. This makes systematic debugging simpler, and mean if needing, change of minification can also integration get product easily. This will because of change of client requirement, from may canonial redaction or revising too. |
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