NMO IE-2 Activity Presentation.pptx
- 1. Convolutional Neural Network (CNN) By :- TYMEB133-ZINJURDE SHRITEJ SANTOSH, TYMEB134- YASHOVARDHAN RAKESH AGARWAL , TYMEB136- THAKARE GAURANG ATUL, TYMEB138- GUJAR NIRAJ PRIYADARSHAN NMO IE-2 Activity
- 2. Contents 2 • Introduction to Computer Vision • What is CNN ? • Different Types of CNN and use of CNN in Computer Vision • Application of Computer Vision • Conclusion
- 3. Introduction to Computer Vision 3 ● Computer vision is concerned with the automatic extraction, analysis and understanding of useful information from a single image or a sequence of images. - The British Machine Vision Association and Society for Pattern Recognition (BMVA) (or) ● It is an interdisciplinary field that deals with how computers can be made to gain high-level understanding from digital images or videos.
- 4. What is CNN(Convolutional Neural Network) 4 ● It is a class of deep learning. ● Convolutional neural network (ConvNet’s or CNNs) is one of the main categories to do images recognition, images classifications, objects detections, recognition faces etc., ● It is similar to the basic neural network. CNN also have learnable parameter like neural network i.e., weights, biases etc. ● CNN is heavily used in computer vision ● There 3 basic components to define CNN ○ The Convolution Layer ○ The Pooling Layer ○ The Output Layer (or) Fully Connected Layer
- 6. Convolution Layer 6 ● Computers read images as pixels and it is expressed as matrix (NxNx3)— (height by width by depth). ● The Convolutional Layer makes use of a set of learnable filters. A filter is used to detect the presence of specific features or patterns present in the original image (input). ● It is usually expressed as a matrix (MxMx3), with a smaller dimension but the same depth as the input file. ● This filter is convolved (slided) across the width and height of the input file, and a dot product is computed to give an activation map.
- 7. Convolution Layer The concept of stride and padding: ● The weight of a matrix moves 1 pixel at a time is called as stride 1 (as we did in above case). What if we increase the stride value? 7
- 8. Convolution Layer ● As we can see in above image the increase in the stride value decreases the size of the image (which may cause in losing the features of the image). ● Padding the input image across it solves our problem, we add more than one layer of zeros around the image in case of higher stride values. 8
- 9. Convolution Layer ● when the input of 6x6 is padded around with zeros we get the output with same dimensions of 6x6 this is known as ‘Same Padding’. ● The middle 4x4 pixel remains the same, here we have retained the more information from borders and also preserved the size of image. 9
- 10. CNN 10 Howto decidethenumberof convolutionlayersandnumberof filtersin CNN ? ● Deeper networks is always better, at the cost of more data and increased complexity of learning. ● You should initially use fewer filters and gradually increase and monitor the error rate to see how it is varying. ● Very small filter sizes will capture very fine details of the image. On the other hand having a bigger filter size will leave out minute details in the image.
- 11. Types of CNN 11 ● Based on the problems, we have the different CNN’s which are used in computer vision. ● The five major computer vision techniques which can be addressed using CNN. ■ Image Classification ■ Object Detection ■ Object Tracking ■ Semantic Segmentation ■ Instance Segmentation
- 12. Types of CNN 12 ImageClassification: ● In an image classification we can use the traditional CNN models or there also many architectures designed by developers to decrease the error rate and increasing the trainable parameters. ■ LeNet (1998) ■ AlexNet (2012) ■ ZFNet (2013) ■ GoogLeNet19 (2014) ■ VGGNet 16 (2014) ■ ResNet(2015)
- 13. Types of CNN 13 Object Detection: ● Here the implementation of CNN is different compared to the previous image classification. ● Here the task is to identify the objects present in the image, therefore traditional implementation of CNN may not help. ■ R CNN ■ Fast R CNN ■ Faster R CNN ■ YOLO
- 14. Applications of Computer Vision 14 ● Computer vision, an AI technology that allows computers to understand and label images, is now used in convenience stores, driverless car testing, daily medical diagnostics, and in monitoring the health of crops and livestock. ● Different use cases found in the computer vision as follows ■ Retail and Retail Security ■ Automotive ■ Healthcare ■ Banking ■ Agriculture ■ Industrial
- 15. Conclusion 15 What is CNN and its different layers. Different types of CNN and its uses in Computer Vision techniques. Different Applications of Computer Vision.
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