摘要:
The functional suitability of video monitoring devices which have at least one camera (8) is checked by means of a measurement device which has a processor (4), and by means of an analysis tool (7) which can be implanted in the processor (4). In this case, the images which are supplied from the at least one camera (8) are analyzed for parameters which are characteristic of the respective function. The analysis tool (7) is formed essentially by software which comprises two modules (5, 6), with one module (5) being provided for the application-specific configuration of the software and containing significant parameters for the current or intended application. The other module (6) is provided for the analysis of the images which are supplied from the at least one camera (8), during which analysis the quality of the images is assessed with respect to the said parameters.
摘要:
A scattered light smoke detector containing an optoelectronical assembly for measuring scatter signals detected below at least one forward scatter angle and at least one backscatter angle and evaluation electronics for determining an alarm value in accordance with the difference between the scatter signals. Smoke signals are produced from the scatter signals by means of a pre-processing step and a measured value is obtained from the smoke signals. The measured value is formed by a linear linking of the sum of the smoke signals to the difference between the smoke signals BW, FW or by establishing the value for the difference between the smoke signals. The linear linking is calculated according to the formula k1(BW+FW)+k2(BW−FW), in which BW and FW are smoke signals and k1 and k2 represent two constants that are influenced among others by an application factor that is dependent on the environmental conditions in the installation location of the detector.
摘要:
A scattered light smoke detector containing an optoelectronical assembly for measuring scatter signals detected below at least one forward scatter angle and at least one backscatter angle and evaluation electronics for determining an alarm value in accordance with the difference between the scatter signals. Smoke signals are produced from the scatter signals by means of a pre-processing step and a measured value is obtained from the smoke signals. The measured value is formed by a linear linking of the sum of the smoke signals to the difference between the smoke signals BW, FW or by establishing the value for the difference between the smoke signals. The linear linking is calculated according to the formula k1(BW+FW)+k2(BW−FW), in which BW and FW are smoke signals and k1 and k2 represent two constants that are influenced among others by an application factor that is dependent on the environmental conditions in the installation location of the detector.
摘要:
A method and an apparatus for detecting smoke by way of analysis of at least one video image recorded by a video camera monitoring an area. At least one moving area of the at least one video image is tested for the probable presence of smoke by determining the direction and the size of the moving area. If the test result is positive, at least part of the at least one moving area is evaluated with respect to the presence of smoke as a function of at least one item of information that is characteristic of smoke.