FR2503972A1 - DEVICE FOR ADAPTING THE CODING OF VIDEO SIGNALS RESULTING FROM ANY MODELS OR SCENES - Google Patents

Abstract

AT LEAST ONE TRANSFORMING UNIT 2 WITH ADJUSTABLE THRESHOLD VALUE ADJUSTMENT AND A COMPRESSION UNIT 4 OF THE PICTURE POINTS MOUNTED FOLLOWING ARE PROVIDED IN THE VIDEO SIGNAL PATH BETWEEN THE DIGITAL VALUES CONVERSION DEVICE 5 AND THE IMAGE PROCESSING 6, EACH TRANSFORMING UNIT 2 INCLUDES A HISTOGRAM GENERATOR 3 WHICH IS LOGICALLY COMBINED WITH THE ASSOCIATED TRANSFORMING UNIT 2 AND WITH THE COMPRESSION UNIT 4 IMAGE POINTS, A UNIT D PROVIDED 'EVALUATION 1 FOR VIDEO SIGNAL INFORMATION THAT IS LOGICALLY COMBINED WITH TRANSFORMING UNITS 2, HISTOGRAM GENERATORS 3 AND IMAGE POINT COMPRESSION UNIT 4.

Description

The present invention relates to a device

  to adapt the coding of video signals from mo-

  any patterns or scenes that can be intro

  duits in image processing units or, be used for remote data transmission,

  between an emission or exploration system and a system

  reception device The device according to the invention can also be used in image processing assemblies during the thematic processing of image information coming from a large number of figurative models

  and for the development of databases.

  In the case of automatic data processing

  tions of images by digital processes, it is necessary

  be able to explore different natural scenes as well

  annuities as graphic or halftone patterns in

  view of their subsequent thematic treatment through the

  medium of special means of calculation technique, The scenes or models are then explored in the form of

  digital network and as a single-image, integrated

  grale or mltispectral, under a re-emitted or trans-

  setting using active lighting devices or also passive receiving devices The performance of image processing systems depends largely on devices which allow during exploration an optimal adaptation of the coding of video information for processing subsequent according to the calculation technique,

  and detecting the statistical properties of the images.

  For digital network images the coding spectrum extends from uni-spectral color coding with precision

  eight bits per image point and per spectral channel up to

  than one bit coding per image point for models

in black and white.

  As is clear from the specialized review "Photo-

  grammetric Engeneering and Remote Scanning "volume 45, pages 507 to 515 of NY Chu and PE Anuta, it is possible to advantageously code color models using statistical methods of multispectral classification Two other devices, known in particular by the journal" Spie Proceedings ", volume 155-01, deal with

  binary images or models with components

  particular color positions which strongly limit the universal use of these devices. Devices described by patent applications DE 2 636 093, 2 636 209 and 3 011 553 allow real-time adaptation of the coding of the image points. for a direct visual evaluation of the image by an operator who has followed special information to this effect Both in the journal NY Chu and PE Anuta as in the following device

  patent application DE 2 609 648, the exploration of information

  color formations are done with eight bits of the Si-

  analog video signals are generally converted to

  their digital to date, using eight bits and also transmitted using eight bits since there are no technical means to reduce the bit width per image point during conversion to, for example, 1, 2, 4 bits for analog video signals whose halftone information have periodicity modes between 2 and 15 Therefore it is not possible to adapt the coding of the image directly to halftones of the image or to halftones obtained

  by statistical methods Consequently it is necessary to pre-

  see an important storage location for information

  coded image mation in the form of a network and the conversion of coded image information into thematic data,

  compact and coded requires relatively computation times

  long to date It is not possible to trans-

  put by means of a single bit only images O and L deter-

  mined thanks to a special training operator and who determines the threshold value at

from exploration.

  The object of the present invention is to allow a

  fast processing of video signals with a distribution

  any periodicity of halftone without limiting it with regard to the

  type of model and number of spectral channels.

  The object of the invention is also to create a dis-

  positive to adapt the coding of video signals from

  any models or scenes and which limits the set

  ble video signal information at a volume that is

necessary for their treatment.

  The above problems are solved

  training in the invention by a device for adapting the coding of video signals of any models or scenes

  by means of a device for converting into digital values

  ques and an image processing device mounted as a result of the fact that at least one processing unit

  adjustable threshold value adjustment and a com-

  pressure of the image points mounted as a result are expected

  in the path of the video signal between the connection device

  version in numerical values and the milking device

  image processing, that each transformation unit comprises a histogram generator which is logically combined with the associated transformation unit and with the compression unit of the image points and that an evaluation unit is provided for video signal information

  which is logically combined with the transformer units

  mation, the histogram generators and the communication unit

pressure of the image points.

  Each of the processing units can be

  consisting of a memory supplied by the evaluation unit

  information of the video signals and which can represent

  feel an adaptable threshold value switch The

  The advantage of this is that the image point compression unit can include a multi-stage compression circuit creating different compressions, and an associated mode control which makes it possible to determine the compression ratio. The point compression unit image also includes a circuit which controls the loading of the data word to be processed into image points

  tablets and a synchronization of data transmission

  born between the compression unit and the image processing device as well as the control of reading at

  choice of the content of the processing units and the

  Histogram nerators According to another form of realization

  The histogram generator comprises a word memory which is connected to a counting circuit via a multiplexer, and a counting control circuit which is logically combined with an associated transformation unit and the circuit. The unit for evaluating the information of the video signals can be carried out by means of a microprocessor and a circuit of

  electronic control The use of the evaluation unit

  tion of video signal information allows coding

  automatic and adapted regardless of any sub-

  jectif This is also an advantage when processing

  of a large number of models of the same type The limitation

  information content of the video signals at the volume necessary for the evaluation and obtained thanks to the

  compression is another advantage The trans-

  training also improves contrast

  video signals necessary for evaluation Thanks to the

  Reading of the compression circuit of the image points comprising several compression stages, a significant reduction in the capacity of the memories is obtained. As a result, the transmission times to the devices mounted in

  downstream are also shorter since the long

  word length becomes shorter per image point or

  the number of image points, contained in the word to be trans-

put, increases.

  The compressed data also make it possible to

  optimally bore a database with a view to

  reuse them in an image processing set.

  A particular advantage of the invention resides in the fact that it is possible to carry out an exploration of colors either sequentially or in parallel by means of several spectral channels of models or

  color scenes This is achieved by the fact that each

  that channel has a transformation unit and a

  generator of histograms It is thus possible to pro-

  yield for each color to a preliminary thematic evaluation. Various other features of the invention

  moreover emerge from the detailed description which follows.

  An embodiment of the object of the invention is shown, by way of non-limiting example, to

attached drawings.

  Fig 1 shows the principle of mounting a

device to adapt the coding.

  Fig 2 schematically shows the mounting of the

processing units.

  Fig 3 shows the assembly of the histogram generators. Fig 4 shows the assembly of the evaluation unit

  for video signal information.

  Fig 5 shows the installation of the control unit

pressure of the image points.

  As is apparent from FIG. 1, representing the principle of mounting the device according to the invention, a transformation unit 2 and a compression unit 4 of the image points are provided in the signal path.

  video between the digital conversion device

  ques 5 and the image processing device 6 A compression unit 4 for the image points can be connected to several transformation units 2 since each

  exploration channel must include a transformer unit

  tion 2 Consequently each of the exploration channels also includes a histogram generator 3 A unit

  evaluation 1 of the video signal information is com-

  logically combined with each of the transformation units 2, with the compression unit 4 of the image points and with each of the histogram generators 3 Each of the units

  transformation 2 is logically combined with the general

  Associated histogram rector 3 Another link exists

  between the histogram generator 3 and the compression unit

sion 4 of the image points.

  Fig 2 shows the mounting of the transformer units

  mation which are constituted by a memory 23 of a capa-

  city of 4 x 256 x 8 and supplied by the evaluation unit

  1 of the video signal information The trans-

  training also include a zero multiplexer 21

  and a multiplexer a 22 which are each connected to the dispo-

  conversion to numerical values 5 through

  diary of a control conductor 100 and to the eva-

  luation 1 of the video signal information via the

  median of a control conductor 101 The memory 23 with a capacity of 4 x 256 x 8 represents, in accordance with the exemplary embodiment, four threshold value sensors each of which forms with the common zero multiplexer

  21 and the multiplexer a 22 a transformation unit.

  A signal conductor 200 coming from the conversion device

  sion in numerical values 5 and a signal conductor 201 leading towards the compression unit 4 of the image points and towards the histogram generator 3, are connected to the

memory 23 can be loaded.

  Fig 3 shows the assembly of the histo-

  grams comprising a word memory 31 with a capacity of 4 x 256 x 24, a multiplexer 32, a counting circuit 33 and a counting control circuit 34 The coupling according to fig 3 of these components allows the generation of four histograms each representing a word with a length of 256 x 24 bits The word memory 31 is connected

  to the transformation units by the signal conductor 201.

  A signal conductor 202 connects the word memory 31

  with compression unit 4 image points A con-

  signal lead 102 connects the counting control circuit 34 and the word memory 31 to the evaluation unit 1 of the information of the video signals and a control conductor 104 establishes the connection between the counting control circuit 34 and the compression unit 4 points

image.

  Fig 4 shows that the evaluation unit 1 of the information

  video signal formation comprises a microprocessor II and an electronic control circuit 12 The electronic control circuit 12 is constituted by an address control 13 from which a control conductor 101 leads to the transformation unit 2 according to fig 1 , by a decoder and a control 14 firstly connected to the transformation unit 2, according to FIG. 1,

  through a control conductor 101, two

  xithherly to the histogram generator 3, according to FIG. 1, via a control conductor 102 and thirdly to the compression unit 4 of the image points by a control conductor 103 The electronic control circuit 12 further comprises a first register 15 connected to the processing unit 2, according to FIG. 1, by the control conductor 101, a second register 16 connected, via the control conductor 103, to the unit compression 4 image points, a receiver

  data read 17 with input for a conduc-

  signal generator 203 coming from the compression unit 4 of the image points, and a data recording command 18 connected to the transformation unit 2 by a signal conductor 204 The address command 13 and the decoder and the control 14 are connected via an address bus AB to the microprocessor 11 to which the decoder and the control 14 are also connected by a control bus

  SB and the other units of the electronic control circuit

  only 12 via DB bus and conductors

of data.

  FIG. 5 schematically represents the mounting of the compression unit 4 of the image points which comprises a compression circuit 41 with three stages 42, 43, 44 with a compression ratio of 8: 1, 4: 1 and 2 : 1, and a mode command 45, a control circuit 46 and a read command 47 The control conductor 103 coming from the evaluation unit 1 of the information of the video signals, is

  connected with the 45 mode control and the play control

  ture 47 and the control conductor 104 from the general

  histogram generator 3 with mode control 45 The connection between the compression circuit 41 and the transformation unit 2 is established, according to FIG. 1, by means of

  of the signal conductor 201 while the read command

  ture 47 is further connected to the histogram generator 3 by the signal conductor 202 and to the processing device.

  image 6 by the signal conductor 205.

  Depending on the control signals arriving from the evaluation unit 1, information of the video signals via the control conductor 101 and of the signals arriving from the digital conversion device 5 via the control conductor

  , the video signals from the conversion device

  sion 5 and arriving via the signal conductor 200 in the transformation units, are stored in the memory block, chosen in a corresponding manner, from the associated threshold value sensor where they are transmitted to the generator

  corresponding histograms via the conduc-

  signal generator 201 for the first determination of a histogram Thanks to the control signals arriving from the evaluation unit 1 of the information of the video signals via the control conductor 102, the

  internal control signals necessary for generation.

  of histograms, are first created inside the histogram generator 3 by means of the control circuit

  counting 34 and they are delivered at appropriate times

  requested in counting circuit 33, multiplexer 32 and word memory 31 Counting control circuit 34 also creates control signals which are transmitted to mode control 45 via the driver

  104 with the read command 47 on the unit

  compression tee 4 of the image points it is possible, as a result of the corresponding control signals created by the evaluation unit 1 and arriving by the conductor 103, to store the histograms produced in the data read receiver 17 of the evaluation unit 1 via the signal conductors 202 and 203 It is then possible in unit 1 to evaluate the histograms, to determine the threshold value by means of the control conductor 101 and to a new

  recording of video signals in the trans-

  training through the signal conductor 204.

  When the determination of the threshold value is correct, it is possible, thanks to the control signals created, on the one hand, in the evaluation unit 1 via the

  control conductor 103 and, on the other hand, in the circuit

  count control command 34 through the control conductor 104, and using the mode command 45, select a determined compression either 8: 1, 4: 1, or 2: 1 which is then achieved in the corresponding compression stage 42, 43 or 44 Inside the control circuit 46 the compressed image points

  are reduced to the data width necessary for the provision

  image processing unit 6 and delivered to the latter by

  signal conductor 205 It is also

  It is possible to call up the histograms created by means of the read command 47 and the signal conductor

  202 and then transmit them to the milking device

  image 6 via the conductor 205.

  There is no need to create the histogram at

  from all the data of a model or a scene.

  A significant part is advantageously chosen which allows

  so much, thanks to the histogram produced, to determine a value

their threshold for the whole model.

Claims (6)

  1 Device for adapting the coding of video signals of any models or scenes by means of a device for converting into digital values (5) and of an image processing device (6) mounted in sequence, characterized in that at least one transformation unit (2) with adjustable threshold value adjustment and a compression unit (4) of the image points mounted in succession   are provided in the video signal path between the   positive conversion to numerical values (5) and the dis-   positive image processing (6), in that each transformation unit (2) comprises a histogram generator   (3) which is logically combined with the transformer unit   mation (2) associated and with the compression unit (4) of   picture points and in that there is provided an eva-   luation (1) for the video signal information which is logically combined with the processing units   (2), the histogram generators (3) and the com- pressure of the image points (4).   2 Device according to claim 1, character-   in that each of the transformation units (2) is constituted by a memory (23) which can be supplied with or loaded from the information evaluation unit 1 video signals.   3 Device according to claim 1, charac-   terized in that the compression unit (4) of the image points is constituted by a compression circuit (41)   whose input is connected directly to the outputs of the uni   transformation tees (2), a control circuit (46) for filling the data word to be processed with compressed image points, and a read command (47) for selective reading of the content of the transformation units   (2) and histogram generators (3).   4 Device according to claim 3, character-   in that the compression circuit (41) includes a   single stage of constant compression.   Device according to claim 3, characterized there   in that the compression circuit (41) includes more   several stages (42, 43, 44) of different compressions and a mode control (45).   6 Device according to claim 1, character-   in that each of the histogram generators (3) has a word memory (31) which is connected to a   counting circuit (33) via a multi   plexer (32), and a count control circuit (34) which is logically combined with the transformer unit   associated (2) and with the counting circuit (33).   7 Device according to claim 1, character-   in that the evaluation unit (1) of the information of the video signals is constituted by a microprocessor   (11) and an electronic control circuit (12).