EP0351269A1 - Verfahren und Anordnung zur transparenten Bildeinblendung auf dem Bildschirm einer Sichtkonsole - Google Patents

Verfahren und Anordnung zur transparenten Bildeinblendung auf dem Bildschirm einer Sichtkonsole Download PDF

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Publication number
EP0351269A1
EP0351269A1 EP89401787A EP89401787A EP0351269A1 EP 0351269 A1 EP0351269 A1 EP 0351269A1 EP 89401787 A EP89401787 A EP 89401787A EP 89401787 A EP89401787 A EP 89401787A EP 0351269 A1 EP0351269 A1 EP 0351269A1
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EP
European Patent Office
Prior art keywords
attribute
transparency
memory
image
value
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Granted
Application number
EP89401787A
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English (en)
French (fr)
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EP0351269B1 (de
Inventor
Olivier Florant
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thomson Video Equipement
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Thomson Video Equipement
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
    • G09G5/022—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed using memory planes

Definitions

  • the present invention relates to a method and a device for the transparent overlay of images on the screen of a display console, the console being able to be controlled by a graphics processor.
  • Display consoles controlled by graphics processors conventionally include a random access graphics memory interposed between their screen and their processor to store the data relating to each point or pixel of the graph appearing on the screen.
  • the modification of the graph can be obtained at any time by changing the content of the data relating to each point of the graph stored inside the graphic memory, which has the effect of affecting the luminance and / or the color of each. point or pixel of the graph which is to be modified.
  • the modification is usually carried out by an operator who introduces on a keyboard linked to the processor the instructions which allow the modification of the data relating to each of the points to be modified.
  • the action of the operator on the keyboard triggers in the processor a modification cycle, which is executed either by the launching of a particular program, or by the activation of wired logic operators.
  • This organization makes it possible to obtain synthetic images where the color of each point is defined from the mixture of the three fundamental colors, red, green, blue or from the luminance parameters Y and color differences DR, DB etc. .. commonly used to define images in television.
  • the graphic memory is composed by a set of registers or memory planes each containing colorimetric data which define the color of each point of the image and in this context three memory plans are generally used. GPUs also have a register which makes it possible to produce masks for each point for writing colorimetric data in the three-color planes. The value of the mask plane is consulted before the writing of the point to give the authorization or the prohibition of writing. This allows, to superimpose one image on another according to a precise outline, to describe the zone to be transferred in the mask plane. The transfer function chosen then copies the colorimetric values, red, green, blue, of each point of the image to be copied to place them in place of the red, green and blue values of the background image.
  • the written point is a function of the red, green, blue values of the background point which replaces it and that of the foreground point of the graph.
  • the transition between the embedded image and the background image is too brutal and gives rise to a visual result which requires retouching of the image, it turns out that this retouching of the image is hampered by the fact that the transfer function always applies globally, in the same way for each of the points of the image to be superimposed and it is therefore no longer possible to vary this transfer function point by point, if this is not all or nothing.
  • the object of the invention is to overcome the aforementioned drawbacks.
  • the subject of the invention is a method for the transparent overlay of images on the screen of a display console controlled by a graphics processor connected to a graphics memory comprising memory plans for respectively memorizing the luminance and chrominance attributes of each point of the image capable of being represented on the screen, characterized in that it consists in reserving in the graphic memory an additional memory plan for memorizing the transparency attributes assigned to each point of the image and allow the modification of the set of attribute values, in the graphic memory and relating to each point of the image to be superimposed as a function of the value of its transparency attribute stored in the additional memory plan.
  • the invention also relates to a device for implementing the above method.
  • the main advantage of the method and the device according to the invention is that they allow, thanks to the use of a transparency attribute coming in addition to the three-color attributes, the masking and the transparency overlap of two or more images. Image blends can therefore be obtained very simply by calculating for each point the value of the desired blending function. Since writing to the additional memory plane does not require any other graphic functions than those already used for writing trichrome parameters in the other graphics memory planes, the implementation of the anti-aliasing function which allows pleasant transitions to be made on the edges of the images to be superimposed, is facilitated.
  • the transparency attribute can also be a result of the application of any function having for example the transparency values foreground and background points of the image as parameters to give a very good rendering of the transparency effect.
  • an image element 1 representing a lampshade is placed behind another image element 2 representing a window with bars 3, the element of image 1 being seen by transparency through the transparent parts (panes) of the image element 2.
  • the set of image elements 1 and 2 is embedded on an image background 4.
  • picture elements 1 and 2 are transferred as a whole to the display screen, the picture points of picture element 1 replacing the corresponding picture points constituting the background of scene 4 then l aspect of the points of image 1 (lampshade) corresponding to the point of drawing of image 2 (window) are then all modified to make image 1 appear behind window 2.
  • the effect transparency that allows you to see elements of image 1 behind the windows and bars 3 of the window is obtained by mixing all the points belonging to both the block forming the image 1 and the block forming the image 2; but the result of this mixture reveals discontinuities in the appearance of certain lines common to the two blocks as shown in FIG. 1 by the part of the bar 3 crossing the lampshade.
  • the method and the device according to the invention solve this problem by applying the modifications not to the sets of points defining image elements but to each of the points of the image by assigning them an additional attribute value.
  • V (xy) f (V (xy) , V (xi, yi) , K (xy) , K (xi, yi) ) (2)
  • B (xy) f (B (xy) , B (xi, yi) , K (xy) , K (xi, yi) (3)
  • K (xy) f2 (K (xy) , K (xi, yi) ) (4) in which the values (R, G
  • FIG. 2 An exemplary embodiment of a graphics processor implementing the method and the device according to the invention is shown in FIG. 2.
  • This processor comprises a geometric processor 5 connected in a known manner to a keyboard 6, to a display console 7 , to an image file 8, and to a graphic memory 9.
  • the device for implementing the invention which is represented inside a dotted line 10, comprises a transparency processor 11 and a write authorization processor 12.
  • the transparency processor 11 is connected, on the one hand, to the geometric processor 5 by means of a data bus 13 and, on the other hand, to the write authorization processor 12 by means of a data bus 14.
  • a bus 15 allows the geometric processor 5 to apply setpoint data to the write authorization processor 12.
  • the transparency processor 11 performs the attribute modifications of the pixels of the memory gra phique under the control of the geometric processor 5 and the modified attribute values are then stored by the geometric processor 5 inside the graphic memory 9 via a data and address bus 16 connecting the memory graphic 9 to the geometric processor 5. Also a data bus 17 provides the transport of the attributes read in the graphic memory 9 by the geometric processor 5 to the display console 7. The transport of data and instructions sent by the keyboard 6 to the geometric processor 5 is carried out by the data bus 18.
  • the image file 8 is also connected to the data and address bus 16.
  • FIG. 3 An exemplary embodiment of a transparency processor 11 for the calculation of the attribute values in accordance with the relation (5) described previously is shown in FIG. 3. It is made up of four operators, references respectively from 111 to 114. The function of these operators is to modify the red, green attributes according to the relation (5) described above. blue and transparency of each pixel read in the graphic memory 9. As the operators 111 to 114 are identical only the elements constituting the operator 111 more specifically dedicated to the processing of the attribute of red have been represented inside a dotted line. These elements consist of three registers 18, 19, 20, a programmable read-only memory 21, two multiplication circuits 22 and 23, an adder circuit 24 and a register 25.
  • the registers 18 and 20 are loaded by the attribute values of background and foreground respectively provided by the geometric processor 5 on the data bus 13.
  • the register 19 contains the value of the transparency attribute K found by the geometric processor 5, in the fourth memory plane, and this register serves as address register for the read-only memory 21.
  • the read-only memory 21 contains, in the form of tables, the values 1-K corresponding to the values K of transparency attribute loaded by the processor geometric 5 inside the register 19. Each value 1-K read in the memory 21 is applied to a first operand input of the multiplication circuit 22, the second operand input of which is connected to the output of the register 18.
  • the multiplication circuit 22 performs the multiplication between the value of the red attribute, corresponding to the background of the scene, read in the register 18 with the coefficient 1-K which is read in the read-only memory 21.
  • the result of the multiplication is applied to a first operand input of the adder circuit 24.
  • the register 19 is also connected to a first operand input of the multiplication circuit 23, the second operand input of which is connected to the register 20.
  • the multiplication circuit 23 performs the multiplication between the contents of the registers 19 and 20 comprising the values of K and the red foreground attribute respectively, in order to apply this result to the second operand input of the adder circuit 24.
  • the results of the addition carried out by the adder circuit 24 are transferred inside the register 25.
  • FIG. 4 An embodiment of the write authorization processor is shown in FIG. 4.
  • This processor performs comparisons between the values of the red, green, blue and transparency attributes K of the background image element and the values red, green, blue and K attributes of the setpoint or of the image element to be written.
  • Authorization to write is done by specifying two thresholds C1 and C2.
  • the write authorization processor comprises four elementary comparison blocks referenced from 121 to 124 made up of identical elements and represented for the comparison element 124 inside a dotted line. These include three comparators 26, 27, 28, connected by their outputs to an OR circuit 29.
  • the comparators 26 and 27 compare the attribute of red color R provided by the transparency processor 11 to two threshold values C1R and C2R.
  • the comparator 28 compares the attribute R of the image element to be written with that Rf corresponding to the background image.
  • the results of the comparisons carried out by the comparators 26, 27 and 28 are applied to the input of an OR circuit 29.
  • An OR circuit 30 has its inputs connected respectively to the outputs of the comparison circuits 121 and 124 and provides on its output the write authorization signal which it applies to the write input of the graphic memory 9.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Image Generation (AREA)
  • Controls And Circuits For Display Device (AREA)
  • Image Processing (AREA)
EP19890401787 1988-07-13 1989-06-23 Verfahren und Anordnung zur transparenten Bildeinblendung auf dem Bildschirm einer Sichtkonsole Expired - Lifetime EP0351269B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8809551 1988-07-13
FR8809551A FR2634296B1 (fr) 1988-07-13 1988-07-13 Procede et dispositif pour l'incrustation en transparence d'images sur l'ecran d'une console de visualisation

Publications (2)

Publication Number Publication Date
EP0351269A1 true EP0351269A1 (de) 1990-01-17
EP0351269B1 EP0351269B1 (de) 1994-03-16

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890401787 Expired - Lifetime EP0351269B1 (de) 1988-07-13 1989-06-23 Verfahren und Anordnung zur transparenten Bildeinblendung auf dem Bildschirm einer Sichtkonsole

Country Status (3)

Country Link
EP (1) EP0351269B1 (de)
DE (1) DE68913840T2 (de)
FR (1) FR2634296B1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4149152A (en) * 1977-12-27 1979-04-10 Rca Corporation Color display having selectable off-on and background color control
US4584572A (en) * 1982-06-11 1986-04-22 Electro-Sport, Inc. Video system
US4682297A (en) * 1984-04-13 1987-07-21 International Business Machines Corp. Digital raster scan display system
EP0231061A2 (de) * 1986-01-21 1987-08-05 International Business Machines Corporation Anzeigesysteme für graphische Darstellungen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4149152A (en) * 1977-12-27 1979-04-10 Rca Corporation Color display having selectable off-on and background color control
US4584572A (en) * 1982-06-11 1986-04-22 Electro-Sport, Inc. Video system
US4682297A (en) * 1984-04-13 1987-07-21 International Business Machines Corp. Digital raster scan display system
EP0231061A2 (de) * 1986-01-21 1987-08-05 International Business Machines Corporation Anzeigesysteme für graphische Darstellungen

Also Published As

Publication number Publication date
EP0351269B1 (de) 1994-03-16
FR2634296B1 (fr) 1990-09-07
FR2634296A1 (fr) 1990-01-19
DE68913840T2 (de) 1994-06-30
DE68913840D1 (de) 1994-04-21

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